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<journal-id journal-id-type="publisher-id">Front. Chem.</journal-id>
<journal-title>Frontiers in Chemistry</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Chem.</abbrev-journal-title>
<issn pub-type="epub">2296-2646</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
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<article-id pub-id-type="publisher-id">1386311</article-id>
<article-id pub-id-type="doi">10.3389/fchem.2024.1386311</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Chemistry</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Microwave-assisted synthesis of novel Ti/BTB-MOFs as porous anticancer and antibacterial agents</article-title>
<alt-title alt-title-type="left-running-head">Altharawi et al.</alt-title>
<alt-title alt-title-type="right-running-head">
<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fchem.2024.1386311">10.3389/fchem.2024.1386311</ext-link>
</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Altharawi</surname>
<given-names>Ali</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="corresp" rid="c001">&#x2a;</xref>
<uri xlink:href="https://loop.frontiersin.org/people/2353355/overview"/>
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<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Alqahtani</surname>
<given-names>Safar M.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
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</contrib>
<contrib contrib-type="author">
<name>
<surname>Aldakhil</surname>
<given-names>Taibah</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Ahmad</surname>
<given-names>Irfan</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<aff id="aff1">
<sup>1</sup>
<institution>Department of Pharmaceutical Chemistry</institution>, <institution>College of Pharmacy</institution>, <institution>Prince Sattam Bin Abdulaziz University</institution>, <addr-line>Al-Kharj</addr-line>, <country>Saudi Arabia</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Department of Clinical Laboratory Sciences</institution>, <institution>College of Applied Medical Science</institution>, <institution>King Khalid University</institution>, <addr-line>Abha</addr-line>, <country>Saudi Arabia</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>
<bold>Edited by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/53651/overview">Waquar Ahsan</ext-link>, Jazan University, Saudi Arabia</p>
</fn>
<fn fn-type="edited-by">
<p>
<bold>Reviewed by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/2006441/overview">Ratnamala A.</ext-link>, Indian Institute of Chemical Technology (CSIR), India</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/1353265/overview">Fl&#xe1;vio Figueira</ext-link>, University of Aveiro, Portugal</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Ali Altharawi, <email>a.altharawi@psau.edu.sa</email>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>13</day>
<month>05</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>12</volume>
<elocation-id>1386311</elocation-id>
<history>
<date date-type="received">
<day>15</day>
<month>02</month>
<year>2024</year>
</date>
<date date-type="accepted">
<day>22</day>
<month>04</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2024 Altharawi, Alqahtani, Aldakhil and Ahmad.</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Altharawi, Alqahtani, Aldakhil and Ahmad</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<p>Nano compounds, especially metal-organic frameworks (MOFs), have significant properties. Among the most important properties of these compounds, which depend on their specific surface area and porosity, are biological properties, such as anticancer and antibacterial properties. In this study, a new titanium/BTB metal-organic framework (Ti/BTB-MOF) was synthesized by using titanium nitrate and 1,3,5-Tris(4-carboxyphenyl)benzene (BTB) under microwave radiation. The structure of the synthesized Ti/BTB-MOF was characterized and confirmed using X-ray diffraction (XRD) patterns, X-ray photoelectron spectroscopy (XPS) analysis, Fourier transform infrared (FT-IR) spectra, energy-dispersive X-ray (EDAX) analysis mapping, scanning electron microscope (SEM) images, thermogravimetric analysis (TGA) curves, and Brunauer&#x2013;Emmett&#x2013;Teller (BET) analysis. The <italic>in vitro</italic> anticancer properties of Ti/BTB-MOF were evaluated using the MTT method against MG-63/bone cancer cells and A-431/skin cancer cells. The <italic>in vitro</italic> antibacterial activity was tested using the Clinical and Laboratory Standards Institute (CLSI) guidelines. In the anticancer activity, IC<sub>50</sub> (half-maximal inhibitory concentration) values of 152&#xa0;&#x3bc;g/mL and 201&#xa0;&#x3bc;g/mL for MG-63/bone cancer cells and A-431/skin cancer cells, respectively, were observed. In the antibacterial activity, minimum inhibitory concentrations (MICs) of 2&#x2013;64&#xa0;&#x3bc;g/mL were observed against studied pathogenic strains. The antimicrobial activity of Ti/BTB-MOF was higher than that of penicillin and gentamicin. Therefore, the synthesized Ti/BTB-MOF could be introduced as a suitable bioactive candidate.</p>
</abstract>
<kwd-group>
<kwd>titanium-BTB metal-organic framework</kwd>
<kwd>anticancer agents</kwd>
<kwd>bone cancer cells</kwd>
<kwd>skin cancer cells</kwd>
<kwd>antibacterial agents</kwd>
</kwd-group>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Medicinal and Pharmaceutical Chemistry</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1">
<title>1 Introduction</title>
<p>Cancer is a common cause of human mortality (<xref ref-type="bibr" rid="B47">Turner et al., 2020</xref>). Although methods such as chemotherapy and laser are developing in the treatment of cancer, the reporting of compounds and the presence of new compounds with anticancer properties are still important (<xref ref-type="bibr" rid="B14">Dallavalle et al., 2020</xref>; <xref ref-type="bibr" rid="B5">Anduran et al., 2022</xref>; <xref ref-type="bibr" rid="B27">Melfi et al., 2023</xref>).</p>
<p>Bacteria, a common cause of disease in humans, can also cause the death of humans (<xref ref-type="bibr" rid="B21">Hussain et al., 2022</xref>). The excessive use of antibiotics to suppress these pathogenic agents has led to the resistance of some strains (<xref ref-type="bibr" rid="B40">&#x15e;en Karaman et al., 2020</xref>; <xref ref-type="bibr" rid="B30">Murugaiyan et al., 2022</xref>). Providing new and innovative antibiotics is one way to deal with this problem (<xref ref-type="bibr" rid="B45">Terreni et al., 2021</xref>).</p>
<p>Nanotechnology and metal-organic frameworks (MOFs) have found a worthy place in medical science (<xref ref-type="bibr" rid="B8">Bieniek et al., 2021</xref>; <xref ref-type="bibr" rid="B15">de Alencar Filho et al., 2021</xref>). In MOFs, which are composed of ligands and metals, the most important roles of ligands are flexibility and the possibility of controlling the size and environment of the holes (<xref ref-type="bibr" rid="B9">Cai et al., 2021</xref>; <xref ref-type="bibr" rid="B42">Shen et al., 2021</xref>; <xref ref-type="bibr" rid="B25">Kumar et al., 2023</xref>). The properties of the ligand can be preserved in the final product and give the final product the properties of the ligand (<xref ref-type="bibr" rid="B23">Joyce et al., 2021</xref>; <xref ref-type="bibr" rid="B41">Sharifzadeh et al., 2021</xref>). 1,3,5-Tris(4-carboxyphenyl)benzene (<xref ref-type="fig" rid="F1">Figure 1</xref>) is an organic compound consisting of four benzene rings and three carboxylic acid groups.</p>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption>
<p>Structure of 1,3,5-Tris(4-carboxyphenyl)benzene.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g001.tif"/>
</fig>
<p>Some biological properties such as anticancer activity (<xref ref-type="bibr" rid="B50">Wani and Zargar, 2023</xref>) have been reported from 1,3,5-tris(4-carboxyphenyl)benzene, which is also called BTB. Because it has three carboxylic acid groups in its structure, BTB can coordinate with metals and create MOFs. Several metals, such as Cu (<xref ref-type="bibr" rid="B22">Ji et al., 2023</xref>), Fe (<xref ref-type="bibr" rid="B48">Viltres et al., 2024</xref>), and Zn (<xref ref-type="bibr" rid="B10">Choi et al., 2023</xref>) have been reported to synthesize with BTB to create MOFs. These MOFs have been used as electrochemical sensors (<xref ref-type="bibr" rid="B22">Ji et al., 2023</xref>), to eliminate antibiotics from water (<xref ref-type="bibr" rid="B48">Viltres et al., 2024</xref>), in the adsorption of cationic dyes (<xref ref-type="bibr" rid="B26">Li et al., 2021</xref>), in hydrocarbon adsorption/separation (<xref ref-type="bibr" rid="B49">Wang et al., 2020</xref>), etc.</p>
<p>Another main component of MOFs is the metal. Metals, like ligands, can maintain their properties in MOF compounds (<xref ref-type="bibr" rid="B33">Qiu et al., 2020</xref>; <xref ref-type="bibr" rid="B39">Seidi et al., 2020</xref>; <xref ref-type="bibr" rid="B19">He et al., 2021</xref>). The d-block elements of the periodic table have a high ability as metals in the synthesis of MOF compounds (<xref ref-type="bibr" rid="B36">Roslan and Aris, 2023</xref>). Titanium, whose position is in Group 4 and d-block elements of the periodic table, has been used as a catalyst in the synthesis of chemicals (<xref ref-type="bibr" rid="B38">Samhitha et al., 2022</xref>) and as an antibacterial (<xref ref-type="bibr" rid="B6">Aslam et al., 2021</xref>), anticancer (<xref ref-type="bibr" rid="B38">Samhitha et al., 2022</xref>), and antioxidant agent (<xref ref-type="bibr" rid="B31">Muthuvel et al., 2021</xref>).</p>
<p>In this study, a microwave-assisted method was used to synthesize Ti/BTB-MOF nanostructures. This route is fast, controllable, and economical compared to other methods. In addition, this effective method has produced Ti/BTB-MOF samples with favorable physicochemical properties, which have affected the antibacterial applications of the final compound. Another advantage of this study is the synthesis of Ti/BTB-MOFs as novel anticancer and antibacterial candidates that can be used in other biological fields due to their practical properties.</p>
</sec>
<sec id="s2">
<title>2 Materials, methods, and characterization</title>
<sec id="s2-1">
<title>2.1 Materials</title>
<p>The titanium (IV) nitrate (99.9%) was obtained from Sigma-Aldrich. The 1,3,5-Tris(4-carboxyphenyl)benzene (98%) was obtained from TCI Chemicals.</p>
<p>The bone cancer cells (MG-63), skin cancer cells (A-431), and the pathogenic bacterial strains studied were obtained from the American Type Culture Collection (ATCC).</p>
</sec>
<sec id="s2-2">
<title>2.2 Methods</title>
<sec id="s2-2-1">
<title>2.2.1 Titanium/BTB metal-organic framework (Ti/BTB-MOF)</title>
<p>Using ultrasonic, 1.4&#xa0;mmol 1,3,5-benzene-tri-4-carboxyphenyl (BTB) was dispersed in 20&#xa0;mL double distilled water. A-1&#xa0;mmol aliquot of titanium (IV) nitrate was added to the mixture and stirred for 10&#xa0;min (800&#xa0;rpm) at room temperature. The mixture was subjected to microwave irradiation for 15&#xa0;min (power of 350 W) (<xref ref-type="bibr" rid="B7">Bashar et al., 2022</xref>). The synthesized titanium/BTB-MOF was washed three times with EtOH and then three times with H<sub>2</sub>O. For drying, the synthesized Ti/BTB-MOF was placed under vacuum in an oven at 100&#xb0;C for 3&#xa0;h.</p>
</sec>
<sec id="s2-2-2">
<title>2.2.2 Anticancer tests</title>
<p>The <italic>in vitro</italic> anticancer activity of Ti/BTB-MOF was investigated using MTT (3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide) assay protocols (<xref ref-type="bibr" rid="B35">Rhodes, 1996</xref>; <xref ref-type="bibr" rid="B28">Moghaddam-manesh et al., 2021</xref>; <xref ref-type="bibr" rid="B4">Alkhatami et al., 2023</xref>). In the evaluation and tests, concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL of titanium/BTB-MOF were prepared and treated separately with MG-63/bone cancer cells and A-431/skin cancer cells for 24&#xa0;h and 48&#xa0;h.</p>
</sec>
<sec id="s2-2-3">
<title>2.2.3 Antibacterial tests</title>
<p>
<italic>In vitro</italic> antibacterial tests of Ti/BTB-MOF were investigated using the Clinical and Laboratory Standards Institute (CLSI) and antimicrobial susceptibility testing methods (<xref ref-type="bibr" rid="B16">Etemadi et al., 2016</xref>; <xref ref-type="bibr" rid="B29">Moghaddam-Manesh et al., 2020</xref>; <xref ref-type="bibr" rid="B45">Terreni et al., 2021</xref>). The antibacterial activity of titanium/BTB-MOF was investigated against the pathogenic strains ATCC 33809 (<italic>Vibrio fluvialis</italic>), ATCC 25729 (<italic>Rhodococcus equi</italic>), ATCC 29178 (<italic>Streptococcus iniae</italic>), ATCC 9610 (<italic>Yersinia enterocolitica</italic>), ATCC 13313 (<italic>Shigella dysenteriae</italic>), and ATCC 19115 (<italic>Listeria monocytogenes</italic>).</p>
</sec>
</sec>
<sec id="s2-3">
<title>2.3 Characterization and equipment</title>
<p>X-ray diffraction (XRD) patterns, X-ray photoelectron spectroscopy (XPS) analysis, Fourier transform infrared (FT-IR) spectra, energy-dispersive X-ray (EDAX analysis mapping, scanning electron microscope (SEM) images, thermogravimetric analysis (TGA) curves, and Brunauer&#x2013;Emmett&#x2013;Teller (BET) analysis were used to characterize and confirm the structure of Ti/BTB-MOF. The equipment used for analysis were a DW-XRD-Y3000 (XRD), a SPECS Phoibos 150 (UHV-XPS), a Thermo Nicolet Avatar 360 (FT-IR), a TESCAN MIRA3 (EDAX, EDAX mapping, and SEM), a TA Instruments SDT-Q600 (TGA), and a BELSORP mini II (BET).</p>
<p>In antibacterial activity tests, the required concentration of the studied strains was prepared using a Jenway 7315 UV/Visible spectrophotometer.</p>
<p>In anticancer activity tests, a KERN OCM 161 inverted microscope was used to count cancer cells, and an Accuris MR9610 SmartReader UV-Vis (115&#xa0;V) was used to measure absorbance.</p>
</sec>
</sec>
<sec sec-type="results" id="s3">
<title>3 Results</title>
<sec id="s3-1">
<title>3.1 Ti/BTB-MOF synthesis results</title>
<p>The XRD pattern of Ti/BTB-MOF is given in <xref ref-type="fig" rid="F2">Figure 2</xref>.</p>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption>
<p>The XRD patterns of Ti/BTB-MOF.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g002.tif"/>
</fig>
<p>In the XRD pattern of Ti/BTB-MOF, plates [011], [002], [121], [222], and [132] were observed at 2&#x398;.</p>
<p>In the XPS analysis of Ti/BTB-MOF (<xref ref-type="fig" rid="F3">Figure 3</xref>), binding energies of 283&#xa0;eV, 458&#xa0;eV, 464&#xa0;eV, and 532&#xa0;eV were observed.</p>
<fig id="F3" position="float">
<label>FIGURE 3</label>
<caption>
<p>The XPS analysis of Ti/BTB-MOF.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g003.tif"/>
</fig>
<p>In the FT-IR spectrum related to the Ti/BTB-MOF, as shown in <xref ref-type="fig" rid="F4">Figure 4</xref>, absorptions at 655&#xa0;cm<sup>&#x2212;1</sup>, 1,150&#xa0;cm<sup>&#x2212;1</sup>, 1,420&#xa0;cm<sup>&#x2212;1</sup>, 1710&#xa0;cm<sup>&#x2212;1</sup>, and 2,900&#xa0;cm<sup>&#x2212;1</sup> were observed.</p>
<fig id="F4" position="float">
<label>FIGURE 4</label>
<caption>
<p>The FT-IR spectrums of Ti/BTB-MOF.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g004.tif"/>
</fig>
<p>
<xref ref-type="fig" rid="F5">Figure 5</xref> shows the thermal stability of the final product. Two areas of basic weight loss were observed in the TGA curve in the regions of 350&#xb0;C and 480&#xb0;C.</p>
<fig id="F5" position="float">
<label>FIGURE 5</label>
<caption>
<p>The CPVTC of BTB (I) and Ti/BTB-MOF (II) against skin cancer cells, (n &#x3d; 3) &#xb1; SD.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g005.tif"/>
</fig>
<p>The nitrogen adsorption and desorption curves of Ti/BTB-MOF are shown in <xref ref-type="fig" rid="F6">Figure 6</xref>.</p>
<fig id="F6" position="float">
<label>FIGURE 6</label>
<caption>
<p>The EDAX <bold>(A)</bold>, EDAX mapping <bold>(B)</bold>, and SEM image <bold>(C)</bold> of Ti/BTB-MOF.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g006.tif"/>
</fig>
<p>The obtained BET, mean pore diameter, and Barrett&#x2013;Joyner&#x2013;Halenda (BJH) pore volume are given in <xref ref-type="table" rid="T1">Table 1</xref>.</p>
<table-wrap id="T1" position="float">
<label>TABLE 1</label>
<caption>
<p>BET, Barrett&#x2013;Joyner&#x2013;Halenda (BJH) pore volume, and mean pore diameter of Ti/BTB-MOF.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">BET (m<sup>3</sup>/g)</th>
<th align="center">BJH pore volume (cm<sup>3</sup>/g)</th>
<th align="center">Mean pore diameter (nm)</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">35</td>
<td align="center">0.42</td>
<td align="center">1.36</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
<sec id="s3-2">
<title>3.2 Anticancer test results</title>
<sec id="s3-2-1">
<title>3.2.1 Anti-bone cancer cells</title>
<p>The cell proliferation and viability compared to control (CPVTC) of different concentrations of BTB (I) and Ti/BTB-MOF (II) against bone cancer cells at temperatures of 24&#xa0;h and 48&#xa0;h are given in <xref ref-type="fig" rid="F7">Figure 7</xref>.</p>
<fig id="F7" position="float">
<label>FIGURE 7</label>
<caption>
<p>The TGA curve of Ti/BTB-MOF.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g007.tif"/>
</fig>
<p>Based on the obtained results, at 24&#xa0;h, the CPVTC for concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL of Ti/BTB-MOF were obtained as 114%, 99% 85%, 73%, 62%, 54%, and 42% compared to the control, respectively.</p>
<p>At 48&#xa0;h, the CPVTC for concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL of Ti/BTB-MOF were obtained as 85%, 71%, 66%, 59%, 52%, 43%, and 27% compared to the control, respectively.</p>
<p>For BTB at 24&#xa0;h, the CPVTC for concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL were obtained as 167%, 150% 131%, 120%, 109%, 95%, and 81% compared to the control, respectively.</p>
<p>At 48&#xa0;h, the CPVTC for concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL of BTB were obtained as 155%, 142%, 127%, 103%, 99%, 80%, and 66% compared to the control, respectively.</p>
</sec>
<sec id="s3-2-2">
<title>3.2.2 Anti-skin cancer cells</title>
<p>The CPVTC of different concentrations of BTB (I) and Ti/BTB-MOF (II) against skin cancer cells at 24&#xa0;h and 48&#xa0;h are given in <xref ref-type="fig" rid="F8">Figure 8</xref>.</p>
<fig id="F8" position="float">
<label>FIGURE 8</label>
<caption>
<p>The nitrogen adsorption and desorption curves of Ti/BTB-MOF.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g008.tif"/>
</fig>
<p>Based on the obtained results, at 24&#xa0;h, the CPVTC for concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL of Ti/BTB-MOF were obtained as 126%, 106% 92%, 83%, 72%, 62%, and 48% compared to the control, respectively.</p>
<p>At 48&#xa0;h, the CPVTC for concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL of Ti/BTB-MOF were obtained as 91%, 76%, 70%, 65%, 55%, 51%, and 39% compared to the control, respectively.</p>
<p>For BTB at 24&#xa0;h, the CPVTC for concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL were obtained as were obtained as 159%, 142% 126%, 115%, 110%, 93%, and 78% compared to the control, respectively.</p>
<p>At 48&#xa0;h, the CPVTC for concentrations of 5&#xa0;&#x3bc;g/mL, 10&#xa0;&#x3bc;g/mL, 20&#xa0;&#x3bc;g/mL, 40&#xa0;&#x3bc;g/mL, 80&#xa0;&#x3bc;g/mL, 160&#xa0;&#x3bc;g/mL, and 320&#xa0;&#x3bc;g/mL of BTB were obtained as 140%, 135%, 116%, 100%, 92%, 75%, and 62% compared to the control, respectively.</p>
</sec>
<sec id="s3-2-3">
<title>3.2.3 Antibacterial test results</title>
<p>The antibacterial activities of BTB, Ti/BTB-MOF, penicillin, and gentamicin were investigated. The minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and inhibitory zone diameter (IZD) were tested and reported. The tests were repeated three times, and the results, which are the average of three repetitions, are shown in <xref ref-type="table" rid="T2">Table 2</xref>.</p>
<table-wrap id="T2" position="float">
<label>TABLE 2</label>
<caption>
<p>Antibacterial activity of Ti/BTB-MOF (mean, n &#x3d; 3).</p>
</caption>
<table>
<thead valign="top">
<tr>
<th rowspan="2" align="left">Compound strain</th>
<th colspan="3" align="center">BTB</th>
<th colspan="3" align="center">Ti/BTB-MOF</th>
<th colspan="3" align="center">Penicillin</th>
<th colspan="3" align="center">Gentamicin</th>
</tr>
<tr>
<th align="center">MIC &#x3bc;g/mL</th>
<th align="center">MBC &#x3bc;g/mL</th>
<th align="center">IZD mm</th>
<th align="center">MIC &#x3bc;g/mL</th>
<th align="center">MBC &#x3bc;g/mL</th>
<th align="center">IZD mm</th>
<th align="center">MIC &#x3bc;g/mL</th>
<th align="center">MBC &#x3bc;g/mL</th>
<th align="center">IZD mm</th>
<th align="center">MIC &#x3bc;g/mL</th>
<th align="center">MBC &#x3bc;g/mL</th>
<th align="center">IZD mm</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">ATCC 33809</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">64</td>
<td align="center">128</td>
<td align="center">15.37</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
</tr>
<tr>
<td align="center">ATCC 25729</td>
<td align="center">64</td>
<td align="center">128</td>
<td align="center">17.01</td>
<td align="center">16</td>
<td align="center">32</td>
<td align="center">17.93</td>
<td align="center">4</td>
<td align="center">8</td>
<td align="left">19.63</td>
<td align="center">2</td>
<td align="center">4</td>
<td align="center">20.42</td>
</tr>
<tr>
<td align="center">ATCC 29178</td>
<td align="center">128</td>
<td align="center">256</td>
<td align="center">13.25</td>
<td align="center">2</td>
<td align="center">4</td>
<td align="center">20.64</td>
<td align="center">2</td>
<td align="center">4</td>
<td align="center">18.75</td>
<td align="center">4</td>
<td align="center">16</td>
<td align="center">18.31</td>
</tr>
<tr>
<td align="center">ATCC 9610</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">32</td>
<td align="center">64</td>
<td align="center">14.92</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
</tr>
<tr>
<td align="center">ATCC 13313</td>
<td align="center">16</td>
<td align="center">32</td>
<td align="center">16.71</td>
<td align="center">4</td>
<td align="center">16</td>
<td align="center">19.31</td>
<td align="center">32</td>
<td align="center">64</td>
<td align="center">15.27</td>
<td align="center">2</td>
<td align="center">4</td>
<td align="center">22.43</td>
</tr>
<tr>
<td align="center">ATCC 19115</td>
<td align="center">32</td>
<td align="center">64</td>
<td align="center">19.49</td>
<td align="center">2</td>
<td align="center">4</td>
<td align="center">20.08</td>
<td align="center">1</td>
<td align="center">2</td>
<td align="center">20.75</td>
<td align="center">-</td>
<td align="center">-</td>
<td align="center">-</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
</sec>
</sec>
<sec sec-type="discussion" id="s4">
<title>4 Discussion</title>
<sec id="s4-1">
<title>4.1 Synthesis of Ti/BTB-MOF</title>
<p>In this study, a novel Ti/BTB-MOF was synthesized using titanium (IV) nitrate and 1,3,5-Tris(4-carboxyphenyl)benzene under microwave irradiation. The purpose of using the microwave method is to provide optimal conditions for forming MOF nanostructures with desirable properties such as small particle size distribution, desirable thermal stability, and good textural properties. The mechanism of formation of MOF nanostructures by using a microwave-assisted method is developed in this study based on previous literature (<xref ref-type="bibr" rid="B11">Choi et al., 2008</xref>; <xref ref-type="bibr" rid="B12">Couzon et al., 2022</xref>; <xref ref-type="bibr" rid="B17">Fern&#xe1;ndez-Andrade et al., 2023</xref>).</p>
<p>The most important factor in the formation of products using the microwave-assisted method is the heating process. The basis of this process is the interaction between the electrical component of microwaves and polar compounds. Due to the unique characteristics of these waves when heating during chemical reactions, microwaves have been widely used to synthesize nanomaterials, MOFs, organic compounds, etc. In this study, microwave irradiation with a power of 350&#xa0;W was used as the reaction condition. A literature review showed that a power of 350 W leads to a temperature close to 130&#xb0;C (<xref ref-type="bibr" rid="B51">Xiaokang et al., 2020</xref>).</p>
<p>The structure of the final product was predicted and confirmed using the XRD patterns, XPS analysis, EDAX analysis, and EDAX mapping. Then, other characteristics of nanoparticles were investigated and studied using the SEM images, TGA curves, and the BET technique.</p>
<p>The XRD pattern of the final product (<xref ref-type="fig" rid="F2">Figure 2</xref>) was similar to the XRD pattern reported for the crystal structure of titanium nanoparticles (<xref ref-type="bibr" rid="B18">G&#xf3;mez-Avil&#xe9;s et al., 2020</xref>). The XRD patterns of the samples indicate that the nanostructures developed in this study have a higher percentage of crystalline phases than previous reports (<xref ref-type="bibr" rid="B18">G&#xf3;mez-Avil&#xe9;s et al., 2020</xref>). This difference can be related to the efficient effects of the microwave-assisted route on the crystalline properties of the final product.</p>
<p>Using XRD data and the Debye&#x2013;Scherrer equation, the synthesized Ti/BTB-MOF was 68&#xa0;nm (<xref ref-type="bibr" rid="B20">Holzwarth and Gibson, 2011</xref>).</p>
<p>In the XPS analysis of Ti/BTB-MOF (<xref ref-type="fig" rid="F3">Figure 3</xref>), the binding energies related to carbon (1s-283&#xa0;eV) (<xref ref-type="bibr" rid="B32">Oh et al., 2013</xref>; <xref ref-type="bibr" rid="B44">Susi et al., 2015</xref>; <xref ref-type="bibr" rid="B46">Tudino et al., 2020</xref>), titanium (2p<sub>1/2</sub>&#x2013;458&#xa0;eV, and 2p<sub>3/2</sub>&#x2013;464&#xa0;eV) (<xref ref-type="bibr" rid="B43">Shvab et al., 2017</xref>), and oxygen (1s-532&#xa0;eV) (<xref ref-type="bibr" rid="B46">Tudino et al., 2020</xref>) were observed.</p>
<p>The absorptions observed in the FT-IR spectrum (<xref ref-type="fig" rid="F4">Figure 4</xref>) near 655&#xa0;cm<sup>&#x2212;1</sup>, 1,150&#xa0;cm<sup>&#x2212;1</sup>, 1,420&#xa0;cm<sup>&#x2212;1</sup>, 1710&#xa0;cm<sup>&#x2212;1</sup>, and 2,900&#xa0;cm<sup>&#x2212;1</sup> were related to Ti-O (<xref ref-type="bibr" rid="B3">Al-Amin et al., 2016</xref>), C-O (<xref ref-type="bibr" rid="B4">Alkhatami et al., 2023</xref>), C&#x3d;C (<xref ref-type="bibr" rid="B4">Alkhatami et al., 2023</xref>), C&#x3d;O (<xref ref-type="bibr" rid="B2">Akhavan-Sigari et al., 2022</xref>), and C-H (<xref ref-type="bibr" rid="B1">Ahmad et al., 2022</xref>), respectively. The BTB has three carboxylic acid groups, but the broad band due to O-H groups (near 3,200&#x2013;3,500&#xa0;cm&#x2212;1) was not observed in the spectrum of the final product.</p>
<p>Based on the EDAX and EDAX mapping of Ti/BTB-MOF (<xref ref-type="fig" rid="F9">Figure 9A,B</xref>), titanium, carbon, and oxygen were observed in the structure of the final product.</p>
<fig id="F9" position="float">
<label>FIGURE 9</label>
<caption>
<p>The CPVTC of BTB (I) and Ti/BTB-MOF (II) against bone cancer cells, (n &#x3d; 3) &#xb1; SD.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g009.tif"/>
</fig>
<p>Therefore, the structure of <xref ref-type="fig" rid="F10">Figure 10</xref> can be predicted for the novel Ti/BTB-MOF by using XRD patterns, which indicate the presence of titanium nanoparticles in Ti/BTB-MOF structure, the XPS analysis, which indicates the binding energies of carbon, titanium, and oxygen in the final product, FT-IR spectrum, which indicates the absorption of the elements of the raw materials and the bonding of Ti-O and the absence of O-H in the product, and EDAX, EDAX mapping, which proves the presence of carbon, titanium, and oxygen in the final product.</p>
<fig id="F10" position="float">
<label>FIGURE 10</label>
<caption>
<p>Proposed structure of the synthesized Ti/BTB-MOF.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g010.tif"/>
</fig>
<p>SEM, TGA, and BET were used to obtain other characteristics of the Ti/BTB-MOF.</p>
<p>The SEM image of the final product proves its uniformity (<xref ref-type="fig" rid="F9">Figure 9C</xref>) and its nano-size. Uniform morphology and nano-size are parameters that depend on the synthesis method of nanoparticles (<xref ref-type="bibr" rid="B52">Yaqoob et al., 2020</xref>). Therefore, it can be concluded that the technique of synthesizing Ti/BTB-MOF using microwave radiation is suitable for this study.</p>
<p>Based on <xref ref-type="fig" rid="F5">Figure 5</xref>, the weight loss observed at 350&#xb0;C can be attributed to the destruction of BTB, and the weight loss observed at 480&#xb0;C can be attributed to the destruction of the complex.</p>
<p>Using nitrogen adsorption and desorption curves (<xref ref-type="fig" rid="F6">Figure 6</xref>) and the BET technique, the specific surface area for Ti/BTB-MOF was obtained as 35&#xa0;m<sup>2</sup>/g. In nanoparticles, the specific surface area depends on the synthesizing technique (<xref ref-type="bibr" rid="B37">Sajid and P&#x142;otka-Wasylka, 2020</xref>). The high specific surface area indicates that this study used an appropriate synthesis method.</p>
</sec>
<sec id="s4-2">
<title>4.2 Anticancer activity of Ti/BTB-MOF</title>
<p>
<xref ref-type="fig" rid="F7">Figures 7</xref>, <xref ref-type="fig" rid="F8">8</xref> show the best effectiveness and lowest CPVTC anticancer activity against bone and skin cancer cells at 48&#xa0;h and 320&#xa0;&#x3bc;g/mL of Ti/BTB-MOF.</p>
<p>In anticancer activity, the IC<sub>50</sub> values of Ti/BTB-MOF against bone cancer cells and skin cancer cells were calculated by using the linear equation of cell proliferation and viability and concentration curve (<xref ref-type="fig" rid="F11">Figure 11</xref>). The IC<sub>50</sub> values against bone cancer cells were 228&#xa0;&#x3bc;g/mL (24&#xa0;h) and 152&#xa0;&#x3bc;g/mL (48&#xa0;h), and the IC<sub>50</sub> values against skin cancer cells were 266&#xa0;&#x3bc;g/mL (24&#xa0;h) and 201&#xa0;&#x3bc;g/mL (48&#xa0;h).</p>
<fig id="F11" position="float">
<label>FIGURE 11</label>
<caption>
<p>The linear equation of concentration and CPVTC curves for <bold>(A)</bold> bone cancer cells and <bold>(B)</bold> skin cancer cells, (n &#x3d; 3) &#xb1; SD.</p>
</caption>
<graphic xlink:href="fchem-12-1386311-g011.tif"/>
</fig>
<p>For BTB, the IC<sub>50</sub> values against bone cancer cells were 453.73&#xa0;&#x3bc;g/mL (24&#xa0;h) and 354&#xa0;&#x3bc;g/mL (48&#xa0;h), and the IC<sub>50</sub> values against skin cancer cells were 448&#xa0;&#x3bc;g/mL (24&#xa0;h) and 337&#xa0;&#x3bc;g/mL (48&#xa0;h).</p>
<p>Comparing the anticancer results of BTB and Ti/BTB-MOF indicated that the anticancer activity of Ti/BTB-MOF was higher than that of BTB. The reason can be attributed to the nanostructure that is formed and the presence of titanium in the final product.</p>
<p>Based on previous results, the IC<sub>50</sub> values for doxorubicin, which is known as the standard drug against bone and skin cancer cells, have been reported to be close to 50&#xa0;&#x3bc;g/mL (<xref ref-type="bibr" rid="B34">Rezadoost et al., 2019</xref>), which is about 1/3 of the values observed for Ti/BTB-MOF. However, because Ti/BTB-MOF has additional properties, such as its antibacterial activities, the synthesized compound is useful and important.</p>
<p>In the anticancer activities of Ti/BTB-MOF, the <italic>p</italic>-values of the IC<sub>50</sub> values at 24&#xa0;h and 48&#xa0;h were calculated, and the results are given in <xref ref-type="table" rid="T3">Table 3</xref>.</p>
<table-wrap id="T3" position="float">
<label>TABLE 3</label>
<caption>
<p>The <italic>p</italic>-values of the IC<sub>50</sub> values of Ti/BTB-MOF against bone cancer cells and skin cancer cells.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">Cancer cell</th>
<th align="center">
<italic>p</italic>-value 24&#xa0;h (&#x3bc;g/mL)</th>
<th align="center">
<italic>p</italic>-value 48&#xa0;h (&#x3bc;g/mL)</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="center">Bone cancer cells</td>
<td align="center">0.002</td>
<td align="center">0.000</td>
</tr>
<tr>
<td align="center">Skin cancer cells</td>
<td align="center">0.001</td>
<td align="center">0.001</td>
</tr>
</tbody>
</table>
</table-wrap>
<p>The <italic>p</italic>-value results of the investigation of anticancer activity against bone and skin cancer cells indicated that concentrations were a critical parameter at 24 and 48&#xa0;h. By increasing the time and increasing the nanoparticle concentration, the contact of cancer cells with the Ti/BTB-MOF increases and leads to an increase in its anticancer properties. As previous studies have suggested, increasing the specific surface area increases biological activities (<xref ref-type="bibr" rid="B13">Cui and Zhu, 2021</xref>), so here, too, the high specific surface area of Ti/BTB-MOF leads to an increase in contact with cancer cells and increased anticancer properties. Other factors, such as the biological properties of the BTB (<xref ref-type="bibr" rid="B50">Wani and Zargar, 2023</xref>) and Ti (<xref ref-type="bibr" rid="B6">Aslam et al., 2021</xref>; <xref ref-type="bibr" rid="B38">Samhitha et al., 2022</xref>) in the Ti/BTB-MOF structure also influence the anticancer activity.</p>
</sec>
<sec id="s4-3">
<title>4.3 Antibacterial activity of Ti/BTB-MOF</title>
<p>In antibacterial evaluations, as shown in <xref ref-type="table" rid="T2">Table 2</xref>, MIC values against <italic>V. fluvialis</italic>, <italic>R. equi</italic>, <italic>S. iniae</italic>, <italic>Y. enterocolitica</italic>, <italic>S. dysenteriae</italic>, and <italic>L. monocytogenes</italic> were obtained as 128&#xa0;&#x3bc;g/mL, 32&#xa0;&#x3bc;g/mL, 4&#xa0;&#x3bc;g/mL, 64&#xa0;&#x3bc;g/mL, 16&#xa0;&#x3bc;g/mL, and 4&#xa0;&#x3bc;g/mL, respectively. The Ti/BTB-MOF against <italic>S. iniae</italic> had the highest effectiveness. Tests were performed on penicillin and gentamicin, well-known antibiotics on the market. The results showed that penicillin and gentamicin are ineffective on <italic>V. fluvialis</italic> and <italic>Y. enterocolitica</italic>, but significant effectiveness of Ti/BTB-MOF was observed, which is another unique capability of synthesized Ti/BTB-MOF. The antibacterial results of BTB against the studied strains were also higher than those of gentamicin in some strains, such as <italic>L. monocytogenes</italic>. However, the BTB results were generally lower than Ti/BTB-MOF, which can be attributed to the formed nanostructure and the presence of titanium.</p>
<p>The high antimicrobial properties of nanoparticles against the studied strains can also be due to their high specific surface area, leading to more contact and, therefore, more destruction (<xref ref-type="bibr" rid="B24">Khezerlou et al., 2018</xref>; <xref ref-type="bibr" rid="B13">Cui and Zhu, 2021</xref>). In addition, other factors, such as the biological properties of the BTB (<xref ref-type="bibr" rid="B50">Wani and Zargar, 2023</xref>) and Ti (<xref ref-type="bibr" rid="B6">Aslam et al., 2021</xref>; <xref ref-type="bibr" rid="B38">Samhitha et al., 2022</xref>) in Ti/BTB-MOF structure, also influence anticancer activity.</p>
</sec>
</sec>
<sec sec-type="conclusion" id="s5">
<title>5 Conclusion</title>
<p>By using microwave radiation, novel titanium/1,3,5-Tris(4-carboxyphenyl)benzene metal-organic frameworks (Ti/BTB-MOFs) were synthesized. The structure of synthesized Ti/BTB-MOF was predicted using XRD, XPS, FT-IR, EDAX, and EDAX mapping. The Ti/BTB-MOF was characterized using SEM, TGA, and BET. The Ti/BTB-MOF had thermal stability up to 350&#xb0;C. The specific surface area of Ti/BTB-MOF was 35&#xa0;m<sup>2</sup>/g. The 68-nm particle size was another feature of the Ti/BTB-MOF. These characteristics proved that the use of microwave radiation was suitable for the synthesis of Ti/BTB-MOF. The anticancer properties of nanoparticles against bone and skin cancer cells were evaluated. In the investigation, IC<sub>50</sub> values for bone and skin cancer cells were obtained as 152&#xa0;&#x3bc;g/mL and 201&#xa0;&#x3bc;g/mL, respectively. The antibacterial properties of the synthesized Ti/BTB-MOF were also evaluated, and MIC, MBC, and IZD were reported. The antibacterial activity of Ti/BTB-MOF was compared with trade drugs, and on some of the studied strains, Ti/BTB-MOF had better inhibition than the drugs.</p>
</sec>
</body>
<back>
<sec sec-type="data-availability" id="s6">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/Supplementary Material; further inquiries can be directed to the corresponding author.</p>
</sec>
<sec id="s7">
<title>Author contributions</title>
<p>AA: writing&#x2013;review and editing, writing&#x2013;original draft, project administration, conceptualization, methodology. SA: writing&#x2013;review and editing, supervision, investigation, visualization. TA: writing&#x2013;review and editing, writing&#x2013;original draft, formal analysis, validation. IA: writing&#x2013;review and editing, writing&#x2013;original draft, resources.</p>
</sec>
<sec sec-type="funding-information" id="s8">
<title>Funding</title>
<p>The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. The authors extend their appreciation to Prince Sattam bin Abdulaziz University for funding this research work through the project number (PSAU/2023/03/27184).</p>
</sec>
<sec sec-type="COI-statement" id="s9">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="disclaimer" id="s10">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
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