Person: NOMA, Samir Abbas Ali
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NOMA
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Samir Abbas Ali
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Publication Synthesis, characterization and inhibitor properties of benzimidazolium salts bearing 4-(methylsulfonyl)benzyl side arms(Elsevier, 2022-10-26) Güzel, Abdussamat; Noma, Samir Abbas Ali; Şen, Betül; Kazancı, Ali; Taşkın-Tok, Tuğba; Kolac, Turgay; Aktaş, Aydın; Ates, Burhan; Aygün, Muhittin; Gök, Yetkin; NOMA, Samir Abbas Ali; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; ABH-1773-2021Herein, a series of N-heterocyclic carbene (NHC) precursors bearing sulfonyl moieties was prepared. 1-(4-(methylsulfonyl)benzyl)-3-alkylbenzimidazolium chloride salts were synthesized with the reaction of 1-alkylbenzimidazoles with 4-(methylsulfonyl)benzyl chloride. These compounds were characterized by using 1 H NMR, 13 C NMR, FT-IR spectroscopy and elemental analysis techniques. Molecular and crystal structures of compounds 2e and 2j were determined by using the single-crystal X-ray diffraction method. Furthermore, enzyme inhibitory properties of benzimidazolium salt were tested against xanthine oxidase (XO) and acetylcholinesterase (AChE), then determined the IC50 value range of XO were determined from 0.218 to 1.927 mu M, while the IC50 for AChE were determined from 1.328 to 5.22. Docking applications were used by using AutoDock4 in order to define the binding pose of the selected compounds, ( 2c, 2d and 2g ) and also to visualize the correlation of the generated optimal complexes. It is found that the compound 2g has good binding affinity (-11.24 kcal/mol) against AChE, on the other side, compound 2c shows the lowest binding energy (-8.32 kcal/mol) for the XO target. These findings and the defined compounds could be as potential agents to develop effective medicine for AChE and XO in the future.(c) 2022 Elsevier B.V. All rights reserved.Publication Design of laccase-metal-organic framework hybrid constructs for biocatalytic removal of textile dyes(Pergamon-elsevier Science Ltd, 2022-04-01) Birhanlı, Emre; Boran, Filiz; Ulu, Ahmet; Yeşilada, Özfer; Ates, Burhan; Noma, Samir Abbas Ali; NOMA, Samir Abbas Ali; Bursa Uludağ Üniversitesi/Fen Edebiyat Fakültesi/ Kimya Anabilim Dalı.; ABH-1773-2021This study aims to present a simple and effective carrier matrix to immobilize laccase as opposed to complex and tedious immobilization processes and also to use it in the removal of textile dyes. For this purpose, Cobalt (Co) and Copper (Cu) based metal-organic frameworks (MOFs) were prepared and laccase was immobilized on two different MOFs via encapsulation. The characterization outcomes showed that laccase was well immobilized into MOF supports. Optimum pH and temperature were found for Lac/Co-MOF (pH 4.5 at 50 degrees C) and Lac/Cu-MOF (pH 5.0 at 50 degrees C). The Km (0.03 mM) and Vmax (97.4 mu mol/min) values of Lac/Cu-MOF were lower than those of Lac/Co-MOF (Km = 0.13 mM, Vmax = 230.7 mu mol/min). The immobilized laccases showed good reusability as well as improved resistance to temperature denaturation and high storage stability. For instance, the Lac/Co-MOF and Lac/Cu-MOF retained more than 58% activity after 4 weeks of storage at room temperature. Meanwhile, Lac/Co-MOF and Lac/Cu-MOF maintained 56.5% and 55.8% of their initial activity, respectively, after 12 reuse cycles. Moreover, thermal deactivation kinetic studies of immobilized laccases displayed lower k value, higher t1/2, and enhancement of thermodynamic parameters, which means better thermostability. Finally, the decolorization activities for the Lac/Co-MOF were 78% and 61% at the 5th cycle for Reactive Blue 171 andPublication Synthesis of new anthraquinone compounds and evaluation of their considerable xanthine oxidase inhibitory activities(Arkat Usa Inc, 2022-01-01) Parladı, Ufuk; Yılmaz, Ülkü; Noma, Samir Abbas Ali; Ateş, Burhan; Küçükbay, Hasan; NOMA, Samir Abbas Ali; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; ABH-1773-2021A series of anthraquinone derivatives (1-11) was prepared using alkyl halides, quinizarin, and danthron. The structural analysis of new compounds was carried out by 1H, 13C NMR, IR, and UV-Vis spectroscopic techniques. Xanthine oxidase inhibitory activities of compounds were measured using allopurinol as a standard. Inhibition abilities were identified by measuring the uric acid formation at 294 nm at 37 degrees C. According to the IC50 values of the compounds, it was observed that all the compounds in the group had higher inhibition values than allopurinol.Publication Design, synthesis, spectroscopic characterizations, single crystal X-ray analysis, in vitro xanthine oxidase and acetylcholinesterase inhibitory evaluation as well as in silico evaluation of selenium-based N-heterocyclic carbene compounds(Taylor & Francis Inc, 2022-12-28) Kaya, Gülsen; Noma, Samir Abbas Ali; Celepci, Duygu Barut; Bayil, Imren; Taskin-Tok, Tugba; Gok, Yetkin; Ates, Burhan; Aktas, Aydin; Aygun, Muhittin; Tezcan, Burcu; NOMA, Samir Abbas Ali; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; ABH-1773-2021Herein, eight new NHC-based selenourea derivatives were synthesized and characterized by using spectroscopic method (H-1, F-19, and C-13 NMR, FT-IR), and elemental analysis techniques. These compounds were synthesized by mixing benzimidazolium salts, potassium carbonate, and selenium powder in ethyl alcohol. Additionally, the molecular and crystal structures of the three compounds (1c, 2b, and 2c) were determined using the single-crystal x-ray diffraction (XRD) method. Diffraction analysis demonstrated the partial carbon-selenium double-bond character of these compounds. All compounds were determined to be highly potent inhibitors for AChE and XO enzymes. The IC(50 )values for the compounds were found in the range of 0.361-0.754 mu M for XO and from 0.995 to 1.746 mu M for AChE. The DNA binding properties of the compounds were investigated. These compounds did not have a remarkable DNA binding property. Also, DPPH radical scavenging activities of the compounds were also investigated. Compounds (1c), (2a), (3a), and (3b) exhibited more pronounced DPPH radical scavenging activity when compared to other compounds. Docking studies were applied by using AutoDock 4 to determine interaction mechanism of the selected compounds (1a), (1b), and (3b). The compound (1b) has good binding affinity (-9.78 kcal/mol) against AChE, and (-6.86 kcal/mol) for XO target. Drug similarity properties of these compounds compared to positive controls were estimated and evaluated by ADMET analysis. Furthermore, molecular dynamics simulations have been applied to understand the accuracy of docking studies. These findings and the defined compounds could be potential candidates for the discovery and progress of effective medicine(s) for AChE and XO in the future.In this study, we synthesized selenourea derivatives from N-heterocyclic carbene (NHC) precursors. All compounds were characterized by using NMR, FTIR spectroscopic method, and elemental analysis technique. In addition, the crystal structure of the three compounds was determined using the single-crystal X-ray diffraction method. New selenoura derivatives were tested for their effect to inhibit the xanthine oxidase and acetylcholinesterase enzymes. The DNA binding properties of the Se-NHC compounds were investigated and the compounds did not have significant DNA binding properties. In addition, DPPH radical scavenging activities of Se-NHC compounds were also investigated. All compounds exhibited DPPH radical scavenging activity. Molecular Docking studies using AutoDock 4 were used to determine the interaction mechanism of selected compounds (1a, 1b, and 3b) Drug similarity properties of these compounds compared to positive controls were estimated and evaluated by ADMET analysis. Furthermore, molecular dynamics simulations have been applied to understand the accuracy of docking studies.Publication A new design to enhance the enzyme activities: Investigation of L-asparaginase catalytic performance by IMAC effect on g-C₃N₄ nanolayers(Springer, 2023-07-08) Sert, Buse; Acet, Ömür; Noma, Samir Abbas Ali; Osman, Bilgen; Odabaşı, Mehmet; Ocakoğlu, Kasim; NOMA, Samir Abbas Ali; OSMAN, BİLGEN; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0001-8406-149X ; ABH-1773-2021; ABF-4791-2020Recently, graphite carbon nitride (g-C3N4) has come to the fore as a new material with its carbon-based two-dimensional structure, simple preparation procedure, and excellent physicochemical stability properties. This study aims to investigate the activity and kinetic studies of the L-asparaginase enzyme via immobilized metal ion affinity chromatography (IMAC) process of g-C3N4 nanolayers. Firstly, g-C3N4 nanolayers were synthetized and Ni2+ ions were binded their surfaces. The synthesized samples were investigated by SEM, ICP-MS, XRD, and FTIR. The highest L-ASNase adsorption on Ni2+-g-C3N4 nanostructures was 444.1 mg/g, at 3 mg/mL L-ASNase concentration. Optimal medium conditions for L-ASNase adsorption occurred at pH 8.0 and 25 degrees C. The immobilized enzyme showed improved stability relating to the soluble enzyme in extreme situations. On the other hand, the storage stability and reusability of the immobilized enzyme were found to be approximately 64 and 53% of the original activity after 29 days at room temperature and 10 cycles, respectively. From the Michaelis-Menten constants Km and Vmax, both of them decreased after immobilization compare to the free one. The obtained outcomes showed that the g-C3N4 is a suitable matrix for L-asparaginase immobilization with ideal catalytic efficiency and improved stability.[GRAPHICS].Publication Synthesis of 1,4-disubstituted-1,2,3-Triazole derivatives for investigation of inhibition and molecular docking studies against Xanthine Oxidase(Sciencein Publications, 2023-01-01) Mirdan, Mustafa Nabeel Mirdan; Erdemir, Güler Yağız; Noma, Samir Abbas Ali; Tok, Tuğba Taşkın; Ateş, Burhan; Altundaş, Aliye; NOMA, Samir Abbas Ali; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; ABH-1773-2021This study evaluates the inhibition effect of new 1,4-disubstituted-1,2,3-triazoles against Xanthine Oxidase supplemented by molecular modelling. Nine compounds of 1,4-disubstituted-1,2,3-triazoles by Sharpless's approach have been synthesized in this report. The structures of the synthesized compounds were characterized using FT-IR, H-1 and C-13-NMR and Mass spectroscopies Among these synthesized molecules (5bromothiophen-2-yl)(1-(3-fluorobenzyl)-1H-1,2,3-triazole-4-yl)methanone (9f) and (5-Bromothiophen-2-yl(1-(4-methoxybenzyl)-1H-1,2,3-triazole-4-yl)methanone (9h) showed better activity against Xanthine oxidase (XO) compared to allopurinol. In the light of the XO inhibition results, triazoles having of ketone moiety (9f-i) were found to be more active than triazoles of ketone-free (9a-e). These results were supported by docking models. The docking calculations of the target XO with nine available compounds showed good binding energies with favourable binding interactions. These findings were particularly evident that 9f (BE -7.29 kcal/mol) and 9h (BE -7.59 kcal/mol) are represented encouraging higher inhibition properties towards xanthine oxidase (XO), compared to allopurinol as a reference compound. Significant binding energies and interactions obtained by performing the docking studies are demonstrated, in particular, that the compounds 9f and 9h may be more potential bio compounds than the positive compounds, allopurinol, and febuxostat.Publication Investigation of improved uricase release and kinetic parameters through dual affected responsive nanopolymers(Elsevier Sci Ltd, 2023-06-03) Noma, Samir Abbas Ali; NOMA, Samir Abbas Ali; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; ABH-1773-2021Uricase suppresses the harmful effects of uric acid accumulation by the degradation of uric acid to allantoin. Maintaining enzyme stability is a major challenge. The stability issue can be avoided when using enzymes loaded into polymeric structures. For this purpose, uricase loaded into responsive nanopolymers (UO-RNPs) was synthesized. The characterizations such as SEM, FTIR, and zeta potential of UO-RNPs were performed. Maximum uricase loading to RNPs was investigated and the release performance of UO-RNPs also under variable conditions such as pH and temperature. On the other hand, loading yield (LY) and loading efficiency (LE) was founded 73.22 & PLUSMN; 3.62% and 71.24 & PLUSMN; 4.61%, while storage stability and reusability of the UO-RNPs were found to be about 68% and 51% of the original activity after 4 weeks and 10 cycles, respectively. From Lineweaver-Burk plot the Km was founded 0.192 and 0.327 mM for loaded and free uricase. While V max was founded 0.131 and 0.0714 & mu;M/min for free uricase and UO-RNPs, respectively. UO-RNPs showed promising matrices for high catalytic efficiency and enhanced stability. Up until now, as far as we know, the present study of the loaded uricase into responsive nanopolymers is the first attempt of uricase enzyme in such an investigation.Publication Characterization of the antioxidant activity, total phenolic content, enzyme inhibition, and anticancer properties of Achillea millefolium L. (yarrow)(Taylor & Francis Inc, 2022-05-09) Karaaslan Ayhan, Nagihan; Karaaslan Tunc, Merve Gökşin; Noma, Samir Abbas Ali; Kurucay, Ali; Ateş, Burhan; NOMA, Samir Abbas Ali; Bursa Uludağ Üniversitesi/Fen- Edebiyat Fakültesi/Kimya Bölümü.; ABH-1773-2021The antioxidant activity, total phenolic content, enzyme inhibition, anticancer properties of Achillea millefolium L. (yarrow), which is generally consumed by humans as herbal tea, were investigated. Yarrow extracts were prepared with different extraction techniques and solvents and the optimum conditions were determined. When the antioxidant activity and total phenolic content results were evaluated, the best yield was obtained with ultrasound-assisted extraction for all solvents. Moreover, the yields from highest to lowest were methanol, water, and acetonitrile. The enzyme inhibition and anticancer of Achillea millefolium L. extracts using methanol were evaluated. The IC50 values for the inhibition of xanthine oxidase and acetylcholinesterase were 4.974 +/- 0.54 and 21.891 +/- 1.118 mu g/mL, respectively. The extract concentration was determined to be 23.85 mu g/mL for 50% reduction in growth inhibitory activity cell viability (IC50) against breast cancer (MCF-7).Publication Synthesis and biological evaluation of Au-NHC complexes(Wiley, 2022-07-19) Ekinci, Orhan; Akkoç, Mitat; Khan, Siraj; Yaşar, Sedat; Gürses, Canbolat; Noma, Samir; Balcıoğlu, Sevgi; Şen, Betül; Aygün, Muhittin; Yılmaz, İsmet; NOMA, Samir Abbas Ali; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; ABH-1773-2021New seven Au-N-heterocyclic carbene (NHC) complexes have been synthesized via transmetalation from Ag-NHC complexes. NHC salts, Ag-NHC, and Au-NHC complexes were fully characterized by widely used spectroscopic techniques. The molecular and crystal structures of 3b and 3f Au-NHC complexes were clarified through the single-crystal X-ray diffraction method. According to X-ray diffraction analysis results, the coordination geometry around Au(I) atoms in the complexes are revealed to be almost linear with C-Au-Cl angle. Anticancer activity, DNA binding, xanthine oxidase (XO) inhibitory activity studies, and molecular docking studies were evaluated for all Au-NHC complexes to explore the binding mechanism at the active site. The IC50 value of Au-NHC complexes against human colorectal cancer (Caco-2) and breast cancer (MCF-7) cell lines was defined by MTT assay. The IC50 values for MCF-7 in the range of 5.2 +/- 2 to 152.4 +/- 1 mu M and Caco-2 5.2 +/- 1 to 152.7 +/- 2 mu M showed that 3a, 3b, 3c, 3d, and 3g have better anticancer activity than Cisplatin incredibly complex 3a against both cancer cell line. All Au-NHC complexes showed excellent antimicrobial activity against different bacteria and fungi. 3a was the complex that exhibited the best antimicrobial activity here as well. The XO inhibitory activity experimental results indicated that all gold complexes showed remarkable inhibition activity against XO compared to the generally used standard, allopurinol. The range of IC50 value was determined from 0.407 to 2.681 mu M. 3d complex showed the lowest IC50 value at 0.407 mu M. DNA binding experiments were performed using agarose gel electrophoresis to observe the ability of synthesized Au-NHC complexes to interact with the supercoiled pUC19 plasmid DNA. Molecular docking studies were performed to determine the binding mode of all active compounds against the XO enzyme, antibacterial, antifungal, and MCF-7 cell lines.