Chromatography

Bài viết trình bày việc xây dựng và thẩm định phương pháp định lượng Andrographolid trong hệ nano polyme bằng phương pháp sắc ký lỏng hiệu năng cao (high performance liquid chromatography - HPLC). Phương pháp nghiên cứu: Khảo sát các điều kiện sắc ký. Thẩm định phương pháp định lượng theo hướng dẫn của ICH về tính tương thích hệ thống, độ đặc hiệu, khoảng tuyến tính, độ đúng, độ chính xác, giới hạn phát hiện và giới hạn định lượng dưới.

13p vijeff 27-11-2023 1 1   Download

Bài viết trình bày việc xây dựng phương pháp định lượng đồng thời 6-shogaol, 6-gingerol, 8-gingerol, 10-gingerol trong gừng bằng phương pháp sắc ký lỏng hiệu năng cao (high-performance liquid chromatography - HPLC) ứng dụng trong kiểm nghiệm nguyên liệu và thành phẩm.

16p vijeff 27-11-2023 2 1   Download

This study was conducted to investigate the residual of Chlorpyrifos (CPF) in coffee growing soil at Lam Ha district, Lam Dong province. Fifteen soil samples were collected from coffee intensive gardens in the Phi To, Nam Ha, Me Linh and Dong Thanh communes of Lam Ha district during the February 2023.

9p vishekhar 01-11-2023 0 0   Download

Ebook "Introduction to industrial polypropylene: Properties, catalysts, processes" provide chemists, engineers and students an introduction to the essentials of industrial polypropylene— what it is, how it is made and fabricated, how it is characterized, the markets it serves, and its environmental fate. Technical aspects are described in a straightforward way with minimal discussion of esoteric theory such that a person with a modicum of training in chemistry should be able to grasp.

346p loivantrinh 29-10-2023 0 0   Download

Ebook "Polymers in solution: Their modelling and structure" is devoted to the static properties of flexible polymers in solution, presenting the vast theoretical and experimental progress made in recent years. Work in this area has been especially fruitful because long polymer chains show a universality in their behavior when in solution, despite the variety in their chemical composition and physical properties.

928p loivantrinh 29-10-2023 2 0   Download

Breast cancer is associated with alterations in lipid metabolism. The treatment of breast cancer can also affect serum lipid composition. The purpose of this study was the examination of serum fatty acids (FAs) profiles in breast cancer survivors to assess if the FA levels normalize.

14p visharma 20-10-2023 2 2   Download

The study "Quantification of vildagliptin in tablets using high liquid-performance chromatography" aimed to establish a fast, simple and economical determination procedure for vildagliptin content in tablets by reverse phase high-performance liquid chromatography (Rp-HPLC). Research method: Chromatographic conditions affecting vildagliptin analysis, such as solvent system, sample processing and optimization of chromatographic conditions, and mobile phase ratio... were investigated.

8p giangnhanly 02-10-2023 1 1   Download

In this study, we aimed to examine the phytochemicals using gas chromatography-mass spectrometry (GC-MS) and evaluate in vitro antimicrobial activity of M. cajuputi and C. citratus, two of the most abundant and valuable EOs grown in the Central Vietnam.

4p vimulcahy 02-10-2023 1 1   Download

The present study investigates pesticide residues in samples of fresh and processed fruits and vegetables produced in Republic of Macedonia. Investigations were carried out as a part of the National Monitoring Programme under the recommendations of the European Food Safety Authority (EFSA).

6p viisac 23-09-2023 1 1   Download

Fresh meat preparations, as fresh sausages, hamburger, minced meats etc, are susceptible to rapid oxidation and the consequent browning of meat red color compromises the product attractiveness. As a result for the producers, there is the drastic reduction of products shelf-life. In order to remedy such economic loss, the addition of some substances with antioxidant effect may represent a valid solution.

6p viisac 23-09-2023 1 1   Download

Mozzarella is an unripened cheese widely consumed worldwide. Due to short shelf-life of these products, the addition of few food additives, such as citric acid and lactic acid is allowed by the actual Legislation.

5p viisac 23-09-2023 1 1   Download

Part 2 book "Analytical methods for food safety by mass spectrometry (Vol I - Pesticides)" includes content: Basic research on chromatography mass spectroscopy characteristic parameters of pesticide and chemical pollutants.

590p oursky04 14-09-2023 1 1   Download

Beta-glucosidase (BGL) is an enzyme involved in the degradation of cellulose and plays an essential part in many biological processes. Currently, most BGLs applied in the industry are derived from fungi. Exploring novel BGLs with desired properties is attractive.

9p vimulcahy 18-09-2023 1 1   Download

Porcine epidemic diarrhea (PED), caused by the Porcine epidemic diarrhea virus (PEDV), is an acute, highly contagious disease of pigs of all ages, especially piglets under one week old, with the mortality rate reaching 95–100%. Developing an effective vaccine against PEDV in Vietnam is urgent.

11p vimulcahy 18-09-2023 1 1   Download

Continued part 1, part 2 of ebook "Thermophiles and thermozymes" provides readers with content including: production and characterization of an extracellular acid protease from thermophilic brevibacillus sp. OA30 isolated from an algerian hot spring; transfer RNA modification enzymes from thermophiles and their modified nucleosides in tRNA; thermophilic proteins as versatile scaffolds for protein engineering; cellulases from thermophiles found by metagenomics;...

105p lytamnguyet 04-08-2023 4 2   Download

Ebook Facts on file science experiments: Chemistry experiments - Part 2 includes contents: Chapter 12: endothermic and exothermic reactions, chapter 13: finding molar mass, chapter 14: chemical moles, chapter 15: heat energy, chapter 16: chloride levels, chapter 17: the rate of rusting, chapter 18: thin layer chromatography, chapter 19: levels of sugar, chapter 20: microscale percent composition.

97p haojiubujain03 09-08-2023 1 1   Download

This study has focused on the development of the method LC-MS/MS to determine 2,2-bis(4-hydroxyphenyl)propane (bisphenol A: BPA) and 4,4’-dihydroxydiphenylmethane (bisphenol F: BPF) in indoor samples by using ultrasonication extraction and solid-phase extraction for preparation.

10p viberkshire 09-08-2023 4 4   Download

For the purpose of determining the residues of some recently registered pesticides in Vietnam agricultural products, a quick and precise approach based on a modification of QuEChERS extraction and liquid chromatography tandem mass spectrometry (LC-MS/MS) has been studied.

10p visybill 19-07-2023 2 2   Download

Continued part 1, part 2 of ebook "Clarke’s analytical forensic toxicology" presents the following content: alcohol, drugs and driving; forensic chemistry and solid dosage form identification; colour tests and thin-layer chromatography; immunoassays; ultraviolet, visible and fluorescence spectrophotometry; infrared spectroscopy; raman spectroscopy; gas chromatography; high-performance liquid chromatography;...

350p dieptieuung 14-07-2023 3 1   Download

Part 1 of ebook "Metabolomics tools for natural product discovery: Methods and protocols" presents the following content: bryophytes - liverworts, mosses, and hornworts - extraction and isolation procedures; plant tissue extraction for metabolomics; detection of polar metabolites through the use of gas chromatography–mass spectrometry; metabolite analysis of biological fluids and tissues by proton nuclear magnetic resonance spectroscopy;...

155p dieptieuung 14-07-2023 3 1   Download