美国分析化学(英文)最新文献_第9页

Conductivity Method as a New Monitoring Technique for Corrosion and Corrosion Inhibition Processes of Zinc Metal 电导率法作为锌金属腐蚀和缓蚀过程的一种新的监测技术

美国分析化学(英文) Pub Date : 2020-10-28 DOI: 10.4236/ajac.2020.1110028

Abdelmnim M. Altwaiq, Sa’ib J. Khouri, R. Abdel-Rahem, A. Alkhawaldeh

引用次数: 3

Development and Validation of Methods for Identification and Quantification of Biological Active Substances in the Fruit of Tetrapleura tetraptera 四翅目四翅目昆虫果实中生物活性物质鉴定和定量方法的建立与验证

美国分析化学(英文) Pub Date : 2020-09-25 DOI: 10.4236/AJAC.2020.119027

E. Frimpong, L. Logoyda

引用次数: 0

Determination of Manganese in Tri Calcium Phosphate (TCP) by Atomic Absorption Spectrometry 原子吸收光谱法测定三磷酸钙(TCP)中锰的含量

美国分析化学(英文) Pub Date : 2020-08-13 DOI: 10.4236/ajac.2020.118024

Y. Yildiz, R. Karadag, M. Cordera, B. Gensinger

引用次数: 1

Bioactivity and Kinetic Study of Jatropha curcas Essential Oil Extraction Using Supercritical CO2 超临界CO2萃取麻疯树精油的生物活性及动力学研究

美国分析化学(英文) Pub Date : 2020-08-13 DOI: 10.4236/ajac.2020.118026

L. C. Soto-Armenta, J. C. S. Rivero, C. Ruiz-Mercado, A. González-Coloma, J. A. Rocha-Uribe

引用次数: 1

Determination of Lisinopril in Bulk and Pharmaceutical Formulations by Cloud Point Extraction—A Green Method 浊点萃取-绿色法测定原料药和制剂中赖诺普利的含量

美国分析化学(英文) Pub Date : 2020-08-13 DOI: 10.4236/ajac.2020.118023

V. Sarma, N. Venugopal, L. Giribabu

{"title":"Determination of Lisinopril in Bulk and Pharmaceutical Formulations by Cloud Point Extraction—A Green Method","authors":"V. Sarma, N. Venugopal, L. Giribabu","doi":"10.4236/ajac.2020.118023","DOIUrl":"https://doi.org/10.4236/ajac.2020.118023","url":null,"abstract":"A sensitive and eco-friendly method was developed for the spectrophotometric determination of Lisinopril (LSP) in bulk and pharmaceutical formulations by cloud point extraction technique. The method was based on the formation of a blue-colored coordination complex between Lisinopril (LSP) and Cobalt Thiocyanate (CTC) at a suitable pH. The Complex in aqueous medium was extracted into surfactant layer by cloud point extraction using a non-ionic surfactant Triton X-114 and then the surfactant layer was dissolved in a suitable volume of ethanol and the amount of Lisinopril was determined spectrophotometrically at a wavelength of 625 nm. The conditions like concentration of the drug, concentration of CTC and of Triton X-114, PH, etc. were optimized by OFAT (One Factor At a Time) method. The linear range of calibration curve was 1 - 6 μg/ml and the linear regression equation with a correlation coefficient of 0.99996 was y = 0.0021 + 0.084x. Preconcentration and enrichment factors were found to be 100 and 3.12 respectively, achieving the detection limit of 0.0588 μg/ml. The proposed method was successfully applied for the determination of LSP in the drug formulations. The obtained values were in agreement with the values as quoted by the manufacturers.","PeriodicalId":63216,"journal":{"name":"美国分析化学(英文)","volume":"11 1","pages":"289-300"},"PeriodicalIF":0.0,"publicationDate":"2020-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45419870","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: 2

Analysis of Bactericidal Components in Japanese Honeys 日本蜂蜜中杀菌成分分析

美国分析化学(英文) Pub Date : 2020-08-13 DOI: 10.4236/ajac.2020.118025

K. Karasawa, Masaru Kato, H. Arakawa

{"title":"Analysis of Bactericidal Components in Japanese Honeys","authors":"K. Karasawa, Masaru Kato, H. Arakawa","doi":"10.4236/ajac.2020.118025","DOIUrl":"https://doi.org/10.4236/ajac.2020.118025","url":null,"abstract":"It is known that the factors identified as contributing to the bactericidal activity of honeys are the high sugar concentration, hydrogen peroxide (H2O2) and low pH, and its bactericidal components depend on honey plant and natural environment. Manuka honey has been studied a lot about bactericidal effect. However, since Japanese honeys are mainly used as food, detailed analyzes of bactericidal components and its actions have not been reported. Therefore, we analyzed bactericidal components contained in nine Japanese honeys using Lucigenin-CL-HPLC. As our results, four species components of H2O2, glucose, fructose and methylglyoxal were detected from nine Japanese honeys. The H2O2 concentrations were 4.1 × 10-5 - 1.8 × 10-4 mol/L, the glucose concentrations were 1.4 - 2.8 mol/L, the fructose concentrations were 1.9 - 2.4 mol/L, the methylglyoxal concentrations were 4.0 × 10-3 - 1.6 × 10-2 mol/L. In this study, we confirmed that methylglyoxal is also contained in Japanese honeys, although it is a bactericidal component which is reported to be characteristic of manuka honey. It is considered that the further study of Japanese honeys is useful for more safe use, quality control, and clinical application.","PeriodicalId":63216,"journal":{"name":"美国分析化学(英文)","volume":"11 1","pages":"309-321"},"PeriodicalIF":0.0,"publicationDate":"2020-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47880103","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: 1

Synthesis and Bioactivity of 1-((2-Carbamoylguanidino) (furan-2-ylmethyl)urea 1-(2-氨基甲酰胍)(呋喃-2-甲基)尿素的合成及生物活性研究

美国分析化学(英文) Pub Date : 2020-07-07 DOI: 10.4236/ajac.2020.117022

Chioma Donlawson, Daniel Okechukwu Nweneka, kingsley John Orie, Reminus Okah

引用次数: 5

Is Titration as Accurate as HPLC for Determination of Vitamin C in Supplements? —Titration versus HPLC for Vitamin C Analysis 滴定法与高效液相色谱法测定补充剂中的维生素C一样准确吗?-滴定法与高效液相色谱法测定维生素C

美国分析化学(英文) Pub Date : 2020-07-07 DOI: 10.4236/ajac.2020.117021

Lucile Tiemi Abe-Matsumoto, G. Sampaio, D. Bastos

{"title":"Is Titration as Accurate as HPLC for Determination of Vitamin C in Supplements? —Titration versus HPLC for Vitamin C Analysis","authors":"Lucile Tiemi Abe-Matsumoto, G. Sampaio, D. Bastos","doi":"10.4236/ajac.2020.117021","DOIUrl":"https://doi.org/10.4236/ajac.2020.117021","url":null,"abstract":"Herein, the iodometric titration and HPLC-RP methods were compared for the determination of vitamin C in vitamin and mineral supplements. The methods were validated in terms of linearity, limits of detection (LOD), limits of quantification (LOQ), precision, and recovery by using vitamin standards and a reference material SRM 3280 (multivitamin/multimineral tablets) obtained from the National Institute of Standards and Technology (NIST). A total of 22 samples of vitamin supplements, randomly acquired in local markets of Sao Paulo (Brazil) were evaluated for content of vitamin C by these two methodologies. The precision expressed as RSD was lower than 5% for both methods. LOD was 3.6 μg/mL for HPLC and 1.0 mg for titration, while LOQ were 12.0 μg/mL and 3.0 mg for HPLC and titration, respectively. Percent recoveries (%) of spiked samples ranged from 98.7 to 100.5 for HPLC and from 98 to 104 for titration. The contents of vitamin C in SRM 3280 (Certified value = 42.2 ± 3.7 mg/g) were 40.2 and 42.1 mg/g when determined by HPLC and titration respectively. Statistically, there was no difference in the analysed vitamin C content for half of the samples, irrespective of the method applied. HPLC was more sensitive, but the titrimetric method was faster and consumed less reagent. Although both methods were accurate in determining the vitamin C content in SRM 3280, the matrix constituents of some vitamin supplements may have interfered with the analysis.","PeriodicalId":63216,"journal":{"name":"美国分析化学(英文)","volume":"11 1","pages":"269-279"},"PeriodicalIF":0.0,"publicationDate":"2020-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43466625","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: 7

Synthesis, Characterization and Bioactivity of 1,1-bis(2-Carbamoylguanidino)furan-2-ylmethane 1,1-二(2-氨基甲酰胍)呋喃-2-基甲烷的合成、表征及生物活性

美国分析化学(英文) Pub Date : 2020-06-03 DOI: 10.4236/ajac.2020.116020

Chioma Don-lawson, Daniel Okechukwu Nwenka, Reminus Okah, kingsley John Orie

引用次数: 4

Validated UPLC-MS/MS Method for the Simultaneous Quantification of Vortioxetine and Fluoxetine in Plasma: Application to Their Pharmacokinetic Interaction Study in Wistar Rats 验证的UPLC-MS/MS法同时定量血浆中沃替西汀和氟西汀：在Wistar大鼠药代动力学相互作用研究中的应用

美国分析化学(英文) Pub Date : 2020-06-03 DOI: 10.4236/ajac.2020.116019

Raniah Al-Shalabi, M. Hefnawy, H. I. Aljohar, H. Alrabiah

引用次数: 2