Turkish Journal of Chemistry最新文献_第9页

Influence of soft segment structure, hydrogen bonding, and diisocyanate symmetry on morphology and properties of segmented thermoplastic polyurethanes and polyureas 软段结构、氢键和二异氰酸酯对称对段状热塑性聚氨酯和聚氨酯形貌和性能的影响

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Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3591

EMEL YILGÖR, İSKENDER YILGÖR

引用次数: 0

Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements 改进用一氧化氮氧化测定光催化活性的实验方案的建议

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Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3612

SELİN ERNAM, ZEYNEP ECE AKGÜL, DENİZ ÜNER

{"title":"Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements","authors":"SELİN ERNAM, ZEYNEP ECE AKGÜL, DENİZ ÜNER","doi":"10.55730/1300-0527.3612","DOIUrl":"https://doi.org/10.55730/1300-0527.3612","url":null,"abstract":"The photocatalytic nitric oxide (NO) oxidation reaction is used as a standard diagnostic tool for photocatalytic activity according to the well-defined protocol described by ISO Standard 22197-1-2007. This protocol identifies the negative peak showing a NOx concentration drop during a gas flow switch from the calibration bypass to the reactor as adsorption of NOx on the surface. Evidence is provided for this first transient to be due to a dilution effect in the gas phase within the reactor. With proper models of residence time distribution analysis, this transient revealed the internal hydrodynamics and it can be used to determine the internal volumes of the system. The second transient occurs immediately after the light is switched on. The conversions strongly depend on the time constant of this transient. Controlled measurements of the effect of illumination intensity revealed that at higher light intensities the transient takes longer to reach steady state. The longer transient was attributed to the time needed to reach a thermal steady state of the hot spots generated by the recombination of excess charge carriers. When the catalyst amount was investigated as a parameter, a saturation effect was observed. This saturation effect was correlated with the gas phase concentrations of NOx and moisture and their ratios to the available specific surface area. Hence, additional constraints with respect to the illumination intensity and catalyst amounts are recommended for accurate measurements of photocatalytic activity by NO oxidation.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"25 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135930907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Phthalocyanines prepared from 4,5-dihexylthiophthalonitrile, a popular building block 酞菁是由4,5-二己基噻吩二腈，一种常用的构建块制备的

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Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3582

DERYA TOPKAYA TAŞKIRAN, ZEYNEL ŞAHİN, ÜMİT İŞCİ, FABİENNE DUMOULİN İŞCİ

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Combination of smartphone digital image colorimetry and UV-Vis spectrophotometry as detection systems with solidified floating organic drop microextraction as preconcentration method for the quantification of methyl red in wastewater samples 采用智能手机数字图像比色法与紫外可见分光光度法相结合的检测系统，以固化漂浮有机滴微萃取为预富集法定量测定废水样品中的甲基红

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Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3595

MİRAY BOMBOM, AYÇA GİRGİN, BUSE TUĞBA ZAMAN, FATMA TURAK, SEZGİN BAKIRDERE

{"title":"Combination of smartphone digital image colorimetry and UV-Vis spectrophotometry as detection systems with solidified floating organic drop microextraction as preconcentration method for the quantification of methyl red in wastewater samples","authors":"MİRAY BOMBOM, AYÇA GİRGİN, BUSE TUĞBA ZAMAN, FATMA TURAK, SEZGİN BAKIRDERE","doi":"10.55730/1300-0527.3595","DOIUrl":"https://doi.org/10.55730/1300-0527.3595","url":null,"abstract":". Abstract: In this study, a portable smartphone-based digital image colorimetric system (SDIC) was designed and integrated with a solidified floating organic drop microextraction method (SFODME) for the quantification of methyl red in textile wastewater samples. The RGB (red, green, and blue) data were evaluated for each captured image, and the green channel was selected for quantification due to its linear response for the analyte. Under optimal conditions, an acceptable linear range was recorded for the analyte. The proposed method recorded a limit of detection (LOD) value of 0.046 mg/L. The developed microextraction method was also combined with UV-Vis spectrophotometry, which recorded an LOD value of 0.012 mg/L. Real sample analysis was carried out with textile wastewater samples to check the applicability/accuracy of the developed method, using a matrix matching calibration strategy to enhance quantification accuracy. Satisfactory percent recoveries in the range of 93.3%–114.3% and 92%–92.7% were recorded for the SFODME-SDIC and SFODME-UV methods, respectively","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phytochemical analysis and molecular docking studies of two endemic varieties of Salvia sericeotomentosa 两个丹参特有品种的植物化学分析及分子对接研究

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Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3610

GÜLBAHAR ÖZGE ALİM TORAMAN, HALIL ŞENOL, SEÇİL YAZICI TÜTÜNİŞ, NUR TAN, GÜLAÇTI TOPÇU

{"title":"Phytochemical analysis and molecular docking studies of two endemic varieties of Salvia sericeotomentosa","authors":"GÜLBAHAR ÖZGE ALİM TORAMAN, HALIL ŞENOL, SEÇİL YAZICI TÜTÜNİŞ, NUR TAN, GÜLAÇTI TOPÇU","doi":"10.55730/1300-0527.3610","DOIUrl":"https://doi.org/10.55730/1300-0527.3610","url":null,"abstract":"The use of medicinal plants for treating various diseases dates back thousands of years and has been a part of many cultures around the world. Various parts of plants, including roots, leaves, and flowers, and their extracts have been used to develop remedies to cure different ailments like fever, pain, inflammation, infections, among others. In this research, the aerial parts of both Salvia varieties were extracted with ethanol and water to obtain infusion and decoction, separately. S. sericeotomentosa var. hatayica Celep & Doğan (SH) and Salvia sericeotomentosa Rech. f. var. sericeotomentosa (ST) plants were chemically analyzed for polar compounds using LC-HRMS for the first time. All SH and ST extracts were found to be very rich in rosmarinic acid, salvianolic acid B, hispidulin-7-O-glucoside, and caffeic acid. The study also investigated the antiinflammatory and carbonic anhydrase inhibition properties of the most abundant secondary metabolites extracted from SH and ST. In silico studies were conducted for the first time to explore the effects of these metabolites on TNF-α, iNOS, and human carbonic anhydrase isoenzymes (hCAI and hCAII). Salvianolic acid B should be considered a strong antiinflammatory agent and a carbonic anhydrase I and II inhibitors due to low binding energy scores with the tested enzymes (TNF-α: -12.391 kcal/mol), (iNOS: -7.547 kcal/mol), (hCAI: -7.877 kcal/mol), and (hCAII: -4.312 kcal/mol).","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"16 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The chemical and electrochemical stimuli viologen substituted phthalocyanine with tunable optical features1 化学和电化学刺激物紫素取代了具有可调谐光学特性的酞菁1

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Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3601

ÖZGE DİLARA ATEŞ, GÜLENAY TUNÇ, AHMET ŞENOCAK, BURCU DEDEOĞLU, MEHMET MENAF AYHAN, AYŞE GÜL GÜREK

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Innovative polymer engineering for the investigation of electrochemical properties and biosensing ability 研究电化学性质和生物传感能力的创新聚合物工程

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Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3611

SILA CAN OSMANOĞULLARI, SANİYE SÖYLEMEZ, OĞUZHAN KARAKURT, ŞERİFE ÖZDEMİR HACIOĞLU, ALİ ÇIRPAN, LEVENT KAMİL TOPPARE

{"title":"Innovative polymer engineering for the investigation of electrochemical properties and biosensing ability","authors":"SILA CAN OSMANOĞULLARI, SANİYE SÖYLEMEZ, OĞUZHAN KARAKURT, ŞERİFE ÖZDEMİR HACIOĞLU, ALİ ÇIRPAN, LEVENT KAMİL TOPPARE","doi":"10.55730/1300-0527.3611","DOIUrl":"https://doi.org/10.55730/1300-0527.3611","url":null,"abstract":"Subtle engineering for the generation of a biosensor from a conjugated polymer with the inclusion of fluorine-substituted benzothiadiazole and indole moieties is reported. The engineering includes the electrochemical copolymerization of the indole-6-carboxylic acid (M1) and 5-fluoro-4,7-bis(4-hexylthiophen-2-yl)benzo[c][1,2,5]thiadiazole (M2) on the indium tin oxide and graphite electrode surfaces for the investigation of both their electrochemical properties and biosensing abilities with their copolymer counterparts. The intermediates and final conjugated polymers, Poly(M1) [P-In6C], Poly(M2) [P-FBTz], and copoly(M1 and M2) [P-In6CFBTz], were entirely characterized by 1 H NMR, 13C NMR, CV, UV-Vis-NIR spectrophotometry, and SEM techniques. HOMO energy levels of electrochemically obtained polymers were calculated from the oxidation onsets in anodic scans as -4.78 eV, -5.23 eV, and -4.89 eV, and optical bandgap (Egop) values were calculated from the onset of the lowest-energy Π-Π* transitions as 2.26 eV, 1.43 eV, and 1.59 eV for P-In6C, P-FBTz, and P-In6CFBTz, respectively. By incorporation of fluorine-substituted benzothiadiazole (M2) into the polymer backbone by electrochemical copolymerization, the poor electrochemical properties of P-In6C were remarkably improved. The polymer P-In6CFBTz demonstrated striking electrochemical properties such as a lower optical band gap, red-shifted absorption, multielectrochromic behavior, a lower switching time, and higher optical contrast. Overall, the newly developed copolymer, which combined the features of each monomer, showed superior electrochemical properties and was tested as a glucose-sensing framework, offering a low detection limit (0.011 mM) and a wide linear range (0.05-0.75 mM) with high sensitivity (44.056 µA mM-1 cm-2).","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

pH-responsive intermediary layer cross-linked micelles from zwitterionic triblock copolymers and investigation of their drug-release behaviors 两性离子三嵌段共聚物的ph响应中间层交联胶束及其释药行为的研究

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Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3597

Agung Ari Wibowo, VURAL BÜTÜN

{"title":"pH-responsive intermediary layer cross-linked micelles from zwitterionic triblock copolymers and investigation of their drug-release behaviors","authors":"Agung Ari Wibowo, VURAL BÜTÜN","doi":"10.55730/1300-0527.3597","DOIUrl":"https://doi.org/10.55730/1300-0527.3597","url":null,"abstract":"ABC-type triblock copolymers, namely poly[(ethylene glycol)methyl ether]-block-poly(tert-butyl methacrylate)-block-poly[2-N-(diisopropylamino)ethyl methacrylate] (MPEG-b-PBuMA-b-PDPA), were first synthesized and then the middle blocks were successfully converted into poly(methacrylic acid) to obtain MPEG-b-PMAA-b-PDPA zwitterionic triblock copolymers. These block copolymers were soluble in water and formed micellar aggregates with complex cores via hydrogen bonding interactions between MPEG and PMAA blocks below pH 4.0. When the pH was between 5.0 and 7.0, due to charge compensation between partially protonated PDPA and partially ionized PMAA blocks, micelles with polyion complex cores were observed. If the solution pH was above 8.0, deprotonation of tertiary amine groups provided a hydrophobic character to the PDPA block, which resulted in the formation of PDPAcore micelles while MPEG/anionic PMAA hybrid blocks formed hydrated coronas. Intermediary layer cross-linked (ILCL) micelles from PDPA-core micelles were also prepared by cross-linking the inner PMAA shell. The hydrophobic drug dipyridamole (DIP) was used to investigate the release profile of ILCL micelles. DIP can be loaded to the PDPA cores of the micelles in basic aqueous media. An increase in the degree of cross-linking causes slower release for the model drug. It was concluded that the more complex matrix formation in the intermediary layer of the micelles via cross-linking retards the drug release from the core.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135930603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of ketamine using melamine-modified gold nanoparticles 三聚氰胺修饰金纳米颗粒测定氯胺酮

4区化学

Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3593

GÜLER GÜNEŞ, ZİYA CAN, AYŞEM ARDA, MUSTAFA REŞAT APAK

{"title":"Determination of ketamine using melamine-modified gold nanoparticles","authors":"GÜLER GÜNEŞ, ZİYA CAN, AYŞEM ARDA, MUSTAFA REŞAT APAK","doi":"10.55730/1300-0527.3593","DOIUrl":"https://doi.org/10.55730/1300-0527.3593","url":null,"abstract":"Ketamine is used in medicine because of its anaesthetic and antidepressant effects at low doses. Unfortunately, due to its narcotic effect when used at high doses, its abuse among young people is increasing. It is also one of the most common drugs used in rape. Therefore, there is a need for fast and inexpensive tests that can be performed on-site. With the advancement of nanotechnology, nanoparticle-based approaches have found their place in selective analyses as in many fields. In the developed method, firstly gold nanoparticles were modified with melamine (AuNPs@Mel). Under optimized conditions, hydrogen bonds formed between ketamine and AuNPs@Mel cause the red colour of AuNPs@Mel to shift to blue-purple (i.e. aggregation-induced surface plasmon absorption shift). The association between absorbance and concentration produced a calibration line (curve) having a linearity correlation coefficient of 0.9981 for ketamine concentrations ranging from 4.76 to 47.6 mg L-1. The detection limit of the proposed method was 1.5 mg L-1 and the RSD (relative standard deviation) values of concentrations were changed ranging from 5.2% to 8.2%. The intra-assay and inter-assay measurements using the suggested method resulted in coefficients of variation (CVs) of 5.7% and 8.5%, respectively. Scan transmission electron microscopy (STEM), UV-vis spectrophotometry and FTIR spectroscopy were used to characterize the synthesized and modified AuNPs. Additionally, the procedure was successfully carried out with some interference materials and a real sample of fetal bovine serum. Lastly, using the Student t-test and F tests, the suggested technique was compared to and confirmed against an LC-MS/ MS procedure previously published","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"72 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135930899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green catalyst for clean fuel production via hydrodeoxygenation 通过加氢脱氧生产清洁燃料的绿色催化剂

4区化学

Turkish Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.55730/1300-0527.3589

SELVA BİLGE YÜCEL, YUSUF OSMAN DONAR, SAMED ERGENEKON, BEYZA ÖZOYLUMLU, ALİ SINAĞ

{"title":"Green catalyst for clean fuel production via hydrodeoxygenation","authors":"SELVA BİLGE YÜCEL, YUSUF OSMAN DONAR, SAMED ERGENEKON, BEYZA ÖZOYLUMLU, ALİ SINAĞ","doi":"10.55730/1300-0527.3589","DOIUrl":"https://doi.org/10.55730/1300-0527.3589","url":null,"abstract":"The development of new fuel sources to replace nonrenewable fossil fuels has received substantial attention due to the ongoing demand for fossil fuels. Biomass and raw waste materials are crucial sources to produce suitable alternative fuels instead of nonrenewable fuels and offer a greener approach. Therefore, improving the fuel properties of biooils produced from the thermochemical conversion of biomass and raw waste materials is critical as it is used as an alternative to nonrenewable fuel. Developing an economical and eco-friendly method to produce sustainable and renewable oil by improving biooil containing large amounts of phenolic compounds has become imperative. One of the most intriguing and promising technologies for refining biooil to produce renewable fuels of comparable quality to conventional fossil fuels is the hydrodeoxygenation (HDO)-based process for converting biooil to renewable fuels. This method is almost one of the best improving methods described in the literature. At this point, it is of great importance that the HDO process is carried out catalytically. Carbon materials are preferred for both designing catalysts for HDO and supporting metal nanoparticles by providing chemically inert surfaces and tunable functional groups, high surface area and active sites. The HDO of biomass and raw waste materials has significantly advanced thanks to carbon-based catalysts. In this review, the effect of the surface character and catalytic ability of the carbon support, especially prepared by the green synthesis technique, on the HDO reaction during biooil improvement is discussed. Moreover, HDO reaction parameters and recent studies have been investigated in depth. Thus, green carbon catalysts? role in clean fuel production via the HDO process has been clarified.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135930902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0