Journal of the Brazilian Chemical Society最新文献_第2页

Influence of the Soil Composition on the Determination of 2,4-D and Fipronil in Environmental Samples by SLE-LC-MS/MS 土壤成分对slel - lc -MS/MS法测定环境样品中2,4- d和氟虫腈的影响

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-23 DOI: 10.21577/0103-5053.20230126

B. Goulart, B. Vizioli, Evaldo Luiz Espindola, C. Montagner

引用次数: 1

Evaluation of Extraction Parameters for the Analysis of Lipid Classes in Plants 植物脂类分析的提取参数评价

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-23 DOI: 10.21577/0103-5053.20230091

Taynara Matos, M. Marques, C. Chaves, Flávia S. Zandonadi, C. Palma‐Silva, Alessandra Sussulini

引用次数: 0

Evaluation of the Mandibular Pheromones Produced by Queens of Africanized and European Honeybees under Normal Conditions and During Absconding Processes by HPLC-UV Methodology 用高效液相色谱-紫外分光光度法评价非洲和欧洲蜂王在正常条件下和潜逃过程中产生的下颌信息素

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-23 DOI: 10.21577/0103-5053.20230132

Gesline de Almeida, A. Chaves, Maria Eugênia Queiroz, K. Gramacho, L. Gonçalves

{"title":"Evaluation of the Mandibular Pheromones Produced by Queens of Africanized and European Honeybees under Normal Conditions and During Absconding Processes by HPLC-UV Methodology","authors":"Gesline de Almeida, A. Chaves, Maria Eugênia Queiroz, K. Gramacho, L. Gonçalves","doi":"10.21577/0103-5053.20230132","DOIUrl":"https://doi.org/10.21577/0103-5053.20230132","url":null,"abstract":"Pheromones are essential for colony organization in honeybees. The pheromones 9-ODA ((E)-9-oxodec-2-enoic acid) and 9-HDA ((E)-9-hydroxydec-2-enoic acid), produced by the mandibular gland of the queen, have various functions within the colony, including inhibition of ovarian development of workers, attraction of swarms, and stabilization of the cluster group. An example of reaction of the colony to adverse conditions is absconding, which is defined as mass exit of all of the adult individuals, leaving even brood and food. In this study, the pheromones 9-ODA and 9-HDA were determined in virgin and normal mated, egg-laying European Carniolan and Africanized queens, as well as in mated queens that were in absconding colonies, using liquid chromatography with UV detection developed methodology. Absconding was induced by maintaining free-flying five-standard-Langstroth-frame colonies in a chamber artificially heated to 45 ºC. The obtained results showed that the amount of 9-ODA in Africanized queens (6.56 µg bee-1 ) is very low compared with European queens. However, large amounts of 9-HDA were found in the queens of absconding Africanized swarms (107.4 µg bee-1). According to our results, the quantities of 9-ODA and 9-HDA in Africanized honeybees in Brazil may be contributing to the high rates of absconding, promoting low effect of stabilizing agent, and high effect of attraction of dispersers cluster.","PeriodicalId":17257,"journal":{"name":"Journal of the Brazilian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68340310","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

Evaluation of Polymer Self-Coating on Aluminized Silica Support as Stationary Phase for High-Performance Liquid Chromatography 铝化二氧化硅载体聚合物自涂层作为高效液相色谱固定相的评价

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-23 DOI: 10.21577/0103-5053.20230086

Isabela Ambrosio, A. Santos, A. Faria

{"title":"Evaluation of Polymer Self-Coating on Aluminized Silica Support as Stationary Phase for High-Performance Liquid Chromatography","authors":"Isabela Ambrosio, A. Santos, A. Faria","doi":"10.21577/0103-5053.20230086","DOIUrl":"https://doi.org/10.21577/0103-5053.20230086","url":null,"abstract":"The physical adsorption of a polymer, poly(3,3,3-trifluoropropylmethylsiloxane), on aluminized silica particles, without any additional procedure for polymer immobilization, was studied for 180 days to evaluate the new chromatographic support. Morphological, structural, and chromatographic evaluations of the stationary phase were assessed. After the 15th day of adsorption, a sufficient polymer amount adsorbs onto the aluminized silica particles to separate mixtures of compounds in reversed-phase mode. However, after the 60th day, the polymer layer adhesion occurs more strongly, self-coating the aluminized silica particles. The self-coated stationary phases after 60 days showed similar chromatographic profiles with low hydrophobicity and more interactions with polar compounds, characteristics arising from the fluorinated polymer. The aluminized silica support firmly adhered to the polymer layer, resulting in a separation material chemically stable at alkaline conditions, suggesting a surface reactivity like other well-established supports without asymmetrical peaks for polar compounds.","PeriodicalId":17257,"journal":{"name":"Journal of the Brazilian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68339362","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

Biomarkers Profile of the Mysterious 2019 Oil Spill on the Northeast Coast of Brazil and Discrimination from Unreported Events 2019年巴西东北海岸神秘漏油事件的生物标志物特征及对未报告事件的歧视

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-23 DOI: 10.21577/0103-5053.20230120

I. D. dos Santos, P. Lucena, A. Moraes, Jhonattas C Carregosa, T. Santos, Alberto Wisniewski Jr., J. Santos

{"title":"Biomarkers Profile of the Mysterious 2019 Oil Spill on the Northeast Coast of Brazil and Discrimination from Unreported Events","authors":"I. D. dos Santos, P. Lucena, A. Moraes, Jhonattas C Carregosa, T. Santos, Alberto Wisniewski Jr., J. Santos","doi":"10.21577/0103-5053.20230120","DOIUrl":"https://doi.org/10.21577/0103-5053.20230120","url":null,"abstract":"In 2019, large amounts of oil reached the northeast coast of Brazil, causing damage to the environment and the local economy, especially in the state of Pernambuco. In order to correlate with possible sources, investigation was made of the geochemical biomarkers of the oils using “gold standard” forensic protocols from the European Committee for Standardization (CEN). The biomarkers study was improved by using gas chromatography-tandem mass spectrometry (GC-MS/MS), rather than the standard protocol that suggests use of the selected ion monitoring (SIM) method. Analysis was made of thirteen oil samples from the Pernambuco coast, in order to identify their degrees of similarity and the possible presence of oils from unreported spills. The use of eighteen diagnostic ratios and multivariate analysis revealed a cluster formed by eleven samples with biomarker distributions typical of oil from the 2019 spill. However, two samples had anomalous fingerprints, especially due to the absence of the 18α(H)-oleanane and 18β(H)-oleanane isomers. Both the CEN protocol applied for the classical biomarkers and a comprehensive Fourier transform mass spectrometry (FT-MS) analysis of polar compounds confirmed the dissimilarities between the samples. The findings suggested that these two oils could have originated from an event unrelated to the mysterious 2019 spill.","PeriodicalId":17257,"journal":{"name":"Journal of the Brazilian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68340019","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

Development of a Novel Sensitive and Fast Semi-Covalent Molecularly Imprinted Polymer-Based Magnetic Dispersive Solid-Phase Extraction Method (MIP-MDSPE) for Cholesterol Determination in Milk Samples 基于半共价分子印迹聚合物的磁分散固相萃取法(MIP-MDSPE)测定牛奶样品中胆固醇的研究

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-23 DOI: 10.21577/0103-5053.20230088

Luciane Effting, Alesandro Bail, M. Segatelli, C. Tarley

{"title":"Development of a Novel Sensitive and Fast Semi-Covalent Molecularly Imprinted Polymer-Based Magnetic Dispersive Solid-Phase Extraction Method (MIP-MDSPE) for Cholesterol Determination in Milk Samples","authors":"Luciane Effting, Alesandro Bail, M. Segatelli, C. Tarley","doi":"10.21577/0103-5053.20230088","DOIUrl":"https://doi.org/10.21577/0103-5053.20230088","url":null,"abstract":"In the present study, a novel magnetic dispersive solid-phase extraction method using molecularly imprinted polymer synthesized through semi-covalent imprinting approach was developed for cholesterol (CHO) determination in milk samples by high-performance liquid chromatography with diode array detector (HPLC-DAD). The adsorbent named Fe3O4/SiO2/MIP (MIP: molecularly imprinted polymers) was prepared through sol-gel polymerization of 3-(triethoxysilyl)propyl isocyanate (ICPTES) covalently bonded to CHO with tetraethoxysilane (TEOS), in the presence of Fe3O4/SiO2 particles. The adsorbent was characterized by attenuated total reflection Fourier transform infrared (ATR-FTIR), X-ray diffraction (XRD), dynamic light scattering (DLS) and scanning electron microscopy (SEM). The proposed molecularly imprinted polymer-based magnetic dispersive solid-phase extraction method (MIP-MDSPE) was based on vortex-assisted preconcentration of 10.0 mL of CHO solution in chloroform as donor phase using 10.0 mg of Fe3O4/SiO2/MIP during 60 s. After this step, the magnetic particles were collected using a permanent magnet and the vortex-assisted elution was carried with 500 µL of ethanol during 180 s. A wide analytical curve ranging from 38.5 to 25000 µg L-1 (determination coefficient (R2 ) = 0.998) and low limits of detection (LOD) and quantification (LOQ) 11.5 and 38.5 µg L-1, respectively, were obtained. Milk samples (whole and reduced-fat milk) were subjected to MIP-MDSPE method after saponification reaction followed by CHO extraction with chloroform. Using external calibration, the CHO concentration ranged from 99.2 (reduced-fat milk) to 397.6 mg kg-1 (whole milk) and the accuracy was attested by addition and recovery tests (92 to 97%).","PeriodicalId":17257,"journal":{"name":"Journal of the Brazilian Chemical Society","volume":"35 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68339467","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: 1

Synthesis and Characterization of Molecularly Imprinted Polymers for the Determination of Cocaine in Urine Using Microextraction in Packed Sorvent 包装溶剂微萃取法测定尿液中可卡因分子印迹聚合物的合成与表征

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-23 DOI: 10.21577/0103-5053.20230103

J. Ferreira, Nayara A Dos Santos, K. Borges, Nathália Conceição, Clara Baptista, H. França, W. Romão

{"title":"Synthesis and Characterization of Molecularly Imprinted Polymers for the Determination of Cocaine in Urine Using Microextraction in Packed Sorvent","authors":"J. Ferreira, Nayara A Dos Santos, K. Borges, Nathália Conceição, Clara Baptista, H. França, W. Romão","doi":"10.21577/0103-5053.20230103","DOIUrl":"https://doi.org/10.21577/0103-5053.20230103","url":null,"abstract":"Among stimulant drugs, cocaine deserves attention due to its high rates of seizures worldwide. This work presents the synthesis and characterization of hybrid molecularly imprinted polymers (MIPs) for use in preparing biological samples using a homemade microextraction in a packed sorbent device to extract cocaine. The MIPs synthesized using caffeine and cocaine as templates have been compared. Caffeine was used due to its low value and be easier to obtain than cocaine. Additionally, restricted access molecularly imprinted polymers (RAMIPs) were also produced for comparison purposes. The polymeric materials were characterized using scanning electron microscopy, textural analysis, Fourier transform infrared spectroscopy, and cross polarization/ magic angle spinning 13C nuclear magnetic resonance. The method optimization was performed using linear ion trap mass spectrometer to evaluate the effects of sample pH, type of eluent, washing solvent, adsorption cycles, and eluent volume. In the optimized method, RAMIPs indicated better cocaine extraction compared to MIPs. The quantitative study demonstrated that the developed method was able to accurately quantify cocaine in urine samples with values close to actual concentrations.","PeriodicalId":17257,"journal":{"name":"Journal of the Brazilian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68339858","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

Simultaneous Determination of Glyphosate, AMPA and Inorganic Anions in Water Samples by Gradient Capillary Ion Chromatography 梯度毛细管离子色谱法同时测定水样中草甘膦、AMPA和无机阴离子

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-23 DOI: 10.21577/0103-5053.20230109

Fábio de Matos, G. D. de Carvalho, O. Prestes, M. Adaime, R. Zanella

{"title":"Simultaneous Determination of Glyphosate, AMPA and Inorganic Anions in Water Samples by Gradient Capillary Ion Chromatography","authors":"Fábio de Matos, G. D. de Carvalho, O. Prestes, M. Adaime, R. Zanella","doi":"10.21577/0103-5053.20230109","DOIUrl":"https://doi.org/10.21577/0103-5053.20230109","url":null,"abstract":"The herbicide glyphosate is the most widely used pesticide worldwide. Glyphosate and its major metabolite, aminomethylphosphonic acid (AMPA), have been frequently found in water samples. The widely used methods for determining these compounds are expensive and environmentally unfriendly due to reagent consumption for derivatization. Another possibility is the use of classic ion chromatography, albeit with low sensitivity and subject to interferences. Therefore, this study aimed to develop a method to directly and simultaneously determine glyphosate, AMPA, and common inorganic anions in water samples using gradient capillary ion chromatography without sample pre-treatment and derivatization. The proposed method was validated, presenting adequate linearity for glyphosate and AMPA with a determination coefficient (r2 ) > 0.998. Recoveries ranged from 94 to 105% and 79 to 113% for glyphosate and AMPA, respectively, with a relative standard deviation < 10%. The practical method limits of detection and quantification for both glyphosate and AMPA were 7.5 and 25 µg L-1, respectively. The method presented satisfactory results for the anions fluoride, chloride, bromide, nitrite, nitrate, phosphate, and sulfate, with limits of detection ranging from 7.5 to 200 µg L-1. Application of the method in water samples proved simple, efficient, and cost-effective, enabling the monitoring of these analytes in different water matrices.","PeriodicalId":17257,"journal":{"name":"Journal of the Brazilian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68340129","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

Design and Evaluation of Systemic Administration of Nano Silica MCM48:Eu3+ in Mouse Brain 纳米二氧化硅MCM48:Eu3+在小鼠脑内系统给药的设计与评价

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-06 DOI: 10.21577/0103-5053.20230056

L. Azevedo, B. Andrade-da-Costa, R. Augusto, L. Luz, I. de Souza, Licarion Pinto, I. Alves, S. Alves Júnior

{"title":"Design and Evaluation of Systemic Administration of Nano Silica MCM48:Eu3+ in Mouse Brain","authors":"L. Azevedo, B. Andrade-da-Costa, R. Augusto, L. Luz, I. de Souza, Licarion Pinto, I. Alves, S. Alves Júnior","doi":"10.21577/0103-5053.20230056","DOIUrl":"https://doi.org/10.21577/0103-5053.20230056","url":null,"abstract":"In the present study, we tested the proof of concept that mobil mesoporous silica nanoparticle composition of matter (MCM) No. 48 doped with trivalent europium (nanoMCM48:Eu3+) administered systemically intravenously can act as a suitable vehicle to deliver neural cells to the brain of healthy adult Swiss mice without causing tissue damage. Moreover, we also tested the ability of this nanoparticle to release molecules in vitro, using as drug models caffeine or nicotine in phosphate buffer solution with pH 7.4 adequate to intra and extra-celular medium of the brain. The caffeine and nicotine adsorbed nanoparticles (CAF@MCM48:Eu3+ and NIC@MCM48:Eu3+) were observed in the parenchyma of the cerebral cortex and diffusely dispersed in the cellular cytoplasm. Statistical analysis using multivariate partner recognition methods indicated that there was no sign of cell damage, as it was characterized by chromatin condensation, nuclear condensation, or fragmentation. The characterization of nanoMCM48:Eu3+ as particle size, luminescent properties and release of active components were analyzed. The CAF@MCM48:Eu3+ and NIC@MCM48:Eu3+ nanoparticles were observed in the cerebral cortex parenchyma and diffusely dispersed in the cell cytoplasm, and the release of active components was analyzed. Therefore, the studies showed that mesoporous silica nanoparticles administered systemically via intravenous tissue can act as a suitable vehicle for neural cells in the brain of healthy mice without causing damage.","PeriodicalId":17257,"journal":{"name":"Journal of the Brazilian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68336194","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

Wavepress is a User-Friendly Toolkit for Computational Chemistry, Drug Design and Material Science Wavepress是一个用户友好的计算化学，药物设计和材料科学工具包

IF 1.4 4区化学

Journal of the Brazilian Chemical Society Pub Date : 2023-10-06 DOI: 10.21577/0103-5053.20230057

M. Gonçalves, Cleiton Nunes, T. Sáfadi, Teodorico C. Ramalho

引用次数: 1