Current Chemistry Letters最新文献_第7页

Effect of the permanent presence of major agricultural drains on the Nile River water quality 主要农业排水沟的永久存在对尼罗河水质的影响

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2022.9.001

Ahmed M. K. Abouhalima, Yingxia Li

引用次数: 0

Synthesis and evaluation of green magnetic mesoporous molecularly imprinted polymers for adsorption removal of parabens from cosmetic samples 绿色磁性介孔分子印迹聚合物吸附去除化妆品样品中对羟基苯甲酸酯的合成及评价

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2023.1.008

Nursyahera Azreen Ramin, Saliza Asma

{"title":"Synthesis and evaluation of green magnetic mesoporous molecularly imprinted polymers for adsorption removal of parabens from cosmetic samples","authors":"Nursyahera Azreen Ramin, Saliza Asma","doi":"10.5267/j.ccl.2023.1.008","DOIUrl":"https://doi.org/10.5267/j.ccl.2023.1.008","url":null,"abstract":"Parabens are chemicals that are frequently used as preservatives in numerous cosmetic products. In recent years, the safety concern over these compounds has grown due to their endocrine-disrupting activity. In this research, a novel green magnetic molecularly imprinted polymer (GMMIP) was synthesised using propylparaben as a template and then applied as an adsorbent to selectively recognise and remove parabens from cosmetic samples. The green strategies were introduced by using Persicaria odorata or Kesum leaf extract as a reducing agent to synthesise green magnetic nanoparticles (MNP) as a magnetic core, and deep eutectic solvent (DES) has been designed as an environmentally friendly functional monomer that was used in the preparation of GMMIP. The GMMIP was characterised using Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and Brunauer-Emmett-Teller (BET). The results of FESEM and BET indicated that the GMMIP exhibited an irregular spherical shape and mesoporous characteristics with a pore size of 17.74 nm. The adsorption pH, kinetics, isotherms, and thermodynamics parameters were performed to investigate the interactions that take place between GMMIP and propylparaben. The adsorption processes appeared to best fit the pseudo-second-order kinetic and Freundlich isotherm models at an optimum pH of 12. Findings from a thermodynamics study revealed the adsorption process was exothermic, spontaneous, and more favourable at 298 K. The optimised GMMIP was applied as an adsorbent to remove the parabens from cosmetic samples. When compared to methylparaben and ethylparaben, the GMMIP had the highest selectivity and effectively removed propylparaben, with recoveries ranging from 75.6% to 113.3%. It was found that the limits of detection (LOD) and quantification (LOQ) were between 0.03 and 0.05 mg/L and 0.11 and 0.16 mg/L, respectively. The synthesised GMMIP proved to be a convenient and effective adsorbent to remove parabens from cosmetic products.","PeriodicalId":10942,"journal":{"name":"Current Chemistry Letters","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87222132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of a variety of treatment processes to purify wastewater in the food industry 各种处理工艺的性能，以净化废水在食品工业

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2022.11.003

Adel Q. S. Shamsan, Mohamed R. Fouad, Waleed Yacoob, Mokhtar A. Abdul-Malik, S. A. Abdel-Raheem

引用次数: 12

Zn(OAc)2•2H2O-catalyzed efficient synthesis of 5-Substituted 1H-tetrazoles Zn(OAc)2•2h2o催化5-取代1h -四唑的高效合成

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2023.3.005

Kokane Balaji Digambar, Dr. Ravi Varala, S. G. Patil

引用次数: 1

The global and local Reactivity of C,N-diarylnitryle imines in [3+2] cycloaddition processes with trans-β-nitrostyrene according to Molecular Electron Density Theory: A computational study 基于分子电子密度理论的[3+2]环加成过程中C, n -二芳基硝基亚胺的整体和局部反应性研究

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2022.11.004

Mikołaj Sadowski, Jolanta Utnicka, Adrianna Wójtowicz, Karolina Kula

{"title":"The global and local Reactivity of C,N-diarylnitryle imines in [3+2] cycloaddition processes with trans-β-nitrostyrene according to Molecular Electron Density Theory: A computational study","authors":"Mikołaj Sadowski, Jolanta Utnicka, Adrianna Wójtowicz, Karolina Kula","doi":"10.5267/j.ccl.2022.11.004","DOIUrl":"https://doi.org/10.5267/j.ccl.2022.11.004","url":null,"abstract":"The regioselectivity of the [3+2] cycloaddition reactions between trans-β-nitrostyrene and C,N-diarylnitryle imine analogues as three atom components (TACs) has been studied with the use of Conceptual Density Functional Theory in the framework of Molecular Electron density Theory. Global and local reactivity indices were determined. Presented quantum-chemical computations showed that, for the reaction of nitroalkene with diphenylnitryle imine, the most favourable reaction path is determined by the nucleophilic attack of C3 carbon atom of TAC on an electrophilic Cα carbon atom of nitroalkene. Therefore, the creation of 1,3,4-triphenyl-5-nitro-Δ2-pyrazoline, according to channel B, is more probable. Similarly, to presented conclusion, for reactions of nitroalkene with nitryle imines containing ED group at para position of the phenyl ring also the most favourable reaction paths run through channel B leading to 1,3,4-triphenyl-5-nitro-Δ2-pyrazolines. In turn, reactions of nitroalkene with nitryle imines containing EW group at para position of the phenyl ring have the opposite preference and the most favourable reaction paths is channel A leading to 1,3,5-triphenyl-4-nitro-Δ2-pyrazolines.","PeriodicalId":10942,"journal":{"name":"Current Chemistry Letters","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76031418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Effect of different concentrations and combinations of some plant growth regulators on Punica granatum anther culture 几种植物生长调节剂不同浓度及组合对石榴花药培养的影响

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2023.1.003

H. ewes, A. Abdel-Raheem, A. Salha, A. Rayan

引用次数: 0

An experimental investigation on metallurgical and corrosion behavior of atmospheric plasma sprayed Stellite 6 powder on AISI 304 stainless steel 大气等离子喷涂Stellite 6粉末对AISI 304不锈钢的冶金性能和腐蚀性能的实验研究

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2022.10.003

S. Sarangi, A. Mishra, Seshadev Sahoo

引用次数: 0

Physical characteristics and Freundlich model of adsorption and desorption isotherm for fipronil in six types of Egyptian soil 氟虫腈在6种埃及土壤中吸附解吸等温线的物理特性及Freundlich模型

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2022.8.003

Mohamed R. Fouad

{"title":"Physical characteristics and Freundlich model of adsorption and desorption isotherm for fipronil in six types of Egyptian soil","authors":"Mohamed R. Fouad","doi":"10.5267/j.ccl.2022.8.003","DOIUrl":"https://doi.org/10.5267/j.ccl.2022.8.003","url":null,"abstract":"The soil type and temperature are considered important parameters that can influence the rates and equilibria of different environmental processes. Therefore, the adsorption and desorption isotherms of fipronil in clay loam, clay, sandy loam, sandy clay loam, sand and loamy sand soils at 25 and 50˚C was studied. The amount of fipronil adsorbed and desorbed by different soils was significantly influenced by the temperature. Adsorption was higher in clay loam, clay, sandy clay loam and sandy soil at 25°C, while sand soil and loamy sand soil at 50°C. The non-desorbed amount was greater at 25°C in different types of soil except for clay loam soil. The negative ΔG˚ indicated that the adsorption/desorption in different types of soil was spontaneous at different temperatures. The value of standard enthalpy change (ΔH˚) was positive in clay soil, sandy loam soil, sandy clay loam soil and loamy sand soil for adsorption and sandy loam soil, sand soil and loamy sand soil for desorption. Moreover, the standard entropy change (ΔS˚) was negative in soils for adsorption and desorption isotherms except clay loam soil. Adsorption and desorption isotherms trends as well as the values of the correlation coefficients indicated that the adsorption and desorption isotherms of fipronil in tested soils were fitted to the Freundlich model because the correlation coefficient is very close to 0.999.","PeriodicalId":10942,"journal":{"name":"Current Chemistry Letters","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88831903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Development of fast analytical method for the detection and quantification of Moroccan picholine extra virgin olive oil adulteration using MIR spectroscopy and chemometrics tools 利用MIR光谱和化学计量学工具建立摩洛哥picholine特级初榨橄榄油掺假快速检测和定量分析方法

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2023.2.005

A. Hirri, H. Bouchafra, L. Zarayby, A. Kasrati, Ibrahim Sbai El Otmani

{"title":"Development of fast analytical method for the detection and quantification of Moroccan picholine extra virgin olive oil adulteration using MIR spectroscopy and chemometrics tools","authors":"A. Hirri, H. Bouchafra, L. Zarayby, A. Kasrati, Ibrahim Sbai El Otmani","doi":"10.5267/j.ccl.2023.2.005","DOIUrl":"https://doi.org/10.5267/j.ccl.2023.2.005","url":null,"abstract":"In this study, the adulteration of Moroccan Picholine extra virgin olive oil with Arbequina virgin olive oil was monitored using the Fourier transform mid-infrared (FT-MIR) spectroscopy technique and chemometrics methodologies. To discriminate between olive oil that has been adulterated and unadulterated, principal component analysis (PCA) was utilized for qualitative analysis. We created the best calibration models for quantitative analysis using principal component regression (PCR) and partial least-squares regression (PLS). The first three principal components account for 95% of the overall variability, according to PCA analysis. PCA allows for the classification of the dataset into two groups: adulterated and unadulterated Moroccan Picholine olive oil. The application of the PLS and PCR calibration models for the quantification of adulteration demonstrates high-performance capabilities, as indicated by high values of correlation coefficients R2 greater than 0.999 and 0.995 and lower values of root mean square error (RMSE) less than 0.767 and 2.16 using PLS and PCR, respectively. According to our results, FT-MIR spectroscopy combined with chemometrics approaches can be used successfully as a simple, quick, and non-destructive method for the quantification and discrimination of adulterated olive oil.","PeriodicalId":10942,"journal":{"name":"Current Chemistry Letters","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75674177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of different treatments on the accumulation of histamine in herring and fesikh 不同处理对鲱鱼和鲱鱼组胺积累的影响

Current Chemistry Letters Pub Date : 2023-01-01 DOI: 10.5267/j.ccl.2022.8.002

Ibrahim M. Ibrahim, El-Shahat G. El-Dreny, Hind M. Salih

{"title":"The effect of different treatments on the accumulation of histamine in herring and fesikh","authors":"Ibrahim M. Ibrahim, El-Shahat G. El-Dreny, Hind M. Salih","doi":"10.5267/j.ccl.2022.8.002","DOIUrl":"https://doi.org/10.5267/j.ccl.2022.8.002","url":null,"abstract":"In Egypt, the request for salt fish products has been increasing during many feasts because it is one of Egypt's favorite foods. It has been reported that in certain seasons, these products cause toxicity and even death. Most fish poisonings around the world are known to be caused by elevated histamine levels. Thus, the study assessed the histamine levels of herring and fesikh samples available on the market and established the safety of these products with recommendations for various treatments that may inhibit the production of histamine in herring and fesikh through bacteria and enzyme production. Before manufacturing herring and fesikh, the fresh fish is soaked for one hour in a modified pH solution of 4 by vinegar with the addition of natural substances individually or in combination (such as garlic, onion, hot pepper, or aloe vera) or some chemicals singly (such as edta, nisin, h2o2, formic acid, and so2). The levels of histamine in herring (111 to 138 mg/kg) and fesikh (214 to 279 mg/kg) were unsafe in marketable samples. The histamine levels of herring and fesikh in proposed treatments were safe since they did not exceed 26 mg/kg after 30 days of cold storage for herring or 45 mg/kg after maturity of fesikh. The proposed treatments enhanced greatly herring and fesikh organoleptic qualities, especially those containing natural ingredients, such as garlic, hot pepper, or their mixture beside onion, which are more accepted treatments.","PeriodicalId":10942,"journal":{"name":"Current Chemistry Letters","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79164249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0