Screening of Plant Extracts for Antioxidant Activity: a Comparative Study on Three Testing Methods Tập 13 Số 1 - Trang 8-17 - 2002
Irina Koleva, Teris A. van Beek, J.P.H. Linssen, C.P.G.M. de Groot, L. Evstatieva
AbstractThree methods widely employed in the evaluation of antioxidant activity,
namely 2,2′‐diphenyl‐1‐picrylhydrazyl (DPPH) radical scavenging method, static
headspace gas chromatography (HS‐GC) and β‐carotene bleaching test (BCBT), have
been compared with regard to their application in the screening of plant
extracts. The strengths and limitations of each method have been illustrated by
testing... hiện toàn bộ
A bioautographic agar overlay method for the detection of antifungal compounds from higher plants Tập 2 Số 5 - Trang 199-203 - 1991
Lila Rahalison, Matthias Hamburger, Kurt Hostettmann, Michel Monod, E. Frenk
AbstractA simple bioautographic agar overlay assay using Candida albicans as the
indicator organism for the detection and activity‐guided fractionation of
antifungal compounds by thin layer chromatography has been developed. Inhibition
of fungal growth was assessed by the detection of dehydrogenase activity with
thiazolyl blue (methylthiazolyltetrazolium chloride; MTT). A series of
clinically used... hiện toàn bộ
An efficient microwave‐assisted extraction process of stevioside and rebaudioside‐A from Stevia rebaudiana (Bertoni) Tập 20 Số 3 - Trang 240-245 - 2009
Vikas Jaitak, Bikram Singh Bandna, Vijay Kumar Kaul
AbstractIntroductionStevioside and rebaudioside‐A are major low‐calorie
diterpene steviol glycosides in the leaves of Stevia rebaudiana. They are widely
used as natural sweeteners for diabetic patients, but the long extraction
procedures required and the optimisation of product yield present challenging
problems.ObjectiveTo develop a rapid and effective methodology for the
extraction of stevioside... hiện toàn bộ
Analysis of Rhizoma Polygoni Cuspidati by HPLC and HPLC‐ESI/MS Tập 18 Số 5 - Trang 387-392 - 2007
Tao Yi, Hao Zhang, Zongwei Cai
AbstractAn HPLC method with photodiode array detection (PAD) and ESI/MS
detection was developed for the qualitative and quantitative analysis of the
major chemical constituents of the dried rhizome of Polygonum cuspidatum Sieb.
et Zucc. (Rhizoma Polygoni Cuspidati; Chinese name Hu‐Zhang). Based on the
chromatographic separation on an Altima C18 column using 0.5% aqueous acetic
acid and acetonitril... hiện toàn bộ
Flavonoid Constituents of Phlomis (Lamiaceae) Species Using Liquid Chromatography Mass Spectrometry Tập 29 Số 2 - Trang 180-195 - 2018
Fatemeh Aghakhani, Navaz Kharazian, Zahra Lori gooini
AbstractIntroductionPhlomis is one of the medicinal genera of Lamiaceae. This
genus has unique medicinal properties. Consequently, appropriate methods need to
be described for the identification of the chemical compounds.ObjectiveA liquid
chromatography tandem mass spectrometry (LC–MS/MS) technique on a triple
quadrupole mass spectrometer (TQMS) was used for separation and identification
of leaf f... hiện toàn bộ
Separation of flavonols by capillary electrophoresis: The effect of structure on electrophoretic mobility Tập 5 Số 3 - Trang 121-126 - 1994
Tony K. McGhie, Kenneth R. Markham
AbstractThe electrophoretic mobilities of 33 flavonol aglycones and glycosides
have been measured to determine the structural factors which influence capillary
electrophoretic separation. Factors primarily responsible for differences in
electrophoretic mobility (EM) in flavonols are: the molecular size; the number
and position of the free OH groups on the flavonol skeleton; the number, type
and po... hiện toàn bộ