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Screening and determination of sibutramine in adulterated herbal slimming supplements by HPTLC-UV densitometry.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess
September 2014
a Official Food and Veterinary Control Authority of Geneva , Quai Ernest-Ansermet 22, CH-1211 Geneva 4 , Switzerland.
The adulteration of herbal supplements is of growing importance, especially when they contain undeclared compounds like sibutramine that are unsafe drugs. Sibutramine was withdrawn from US and European markets in 2010. In this study, an HPTLC-UV densitometric method was developed for the quantification of sibutramine in herbal diet foods.
View Article and Find Full Text PDFDensitometric HPTLC analysis of 8-gingerol in Zingiber officinale extract and ginger-containing dietary supplements, teas and commercial creams.
Asian Pac J Trop Biomed
August 2013
Department of Pharmacognosy, College of Pharmacy, Salman Bin AbdulAziz University, P.O. Box 173, Al-Kharj 11942, Kingdom of Saudi Arabia.
Objective: To develop and validate a simple, accurate HPTLC method for the analysis of 8-gingerol and to determine the quantity of 8-gingerol in Zingiber officinale extract and ginger-containing dietary supplements, teas and commercial creams.
Methods: The analysis was performed on 10×20 cm aluminium-backed plates coated with 0.2 mm layers of silica gel 60 F254 (E-Merck, Germany) with n-hexane: ethyl acetate 60: 40 (v/v) as mobile phase.
Ionic liquids as mobile phase additives for feasible assay of naphazoline in pharmaceutical formulation by HPTLC-UV-densitometric method.
J Chromatogr Sci
July 2013
Department of Medicinal Chemistry, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Jurasza 2, 85-094 Bydgoszcz, Poland.
A specific and reliable high-performance thin layer chromatography method with densitometry detection has been developed for the determination of naphazoline nitrate in nasal drops. The best separation of the basic analyte, without spot tailing, was achieved by using a mobile phase composed of acetonitrile-water (60:40, v/v), adding 1.5 % (v/v) imidazolium-class ionic liquid and covering the plates with a stationary phase based on RP-18 with F254S (10 × 20 cm).
View Article and Find Full Text PDFValidated HPTLC method for quantitative determination of gallic acid in stem bark of Myrica esculenta Buch.-Ham. ex D. Don, myricaceae.
J AOAC Int
December 2010
Anand Pharmacy College, Shri Ram Krishna Seva Mandal Campus, Near Town Hall, Anand, Gujarat, India.
A simple, rapid, and precise HPTLC method was developed for quantitative estimation of gallic acid in stem bark of Myrica esculenta, family Myricaceae. Separation was performed on silica gel 60F254 HPTLC plates using toluene-ethyl acetate-formic acid-methanol (3 + 3 + 0.6 + 0.
View Article and Find Full Text PDFA comparative study on various spectrometries with thin layer chromatography for simultaneous analysis of drotaverine and nifuroxazide in capsules.
Chem Pharm Bull (Tokyo)
June 2006
Analytical Chemistry Department, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt.
Three spectrophotometric methods including Vierordt's method, derivative, ratio spectra derivative, and thin layer chromatography (TLC)-UV densitometric method were developed for simultaneous determination of drotaverine HCl (DRT) and nifuroxazide (NIF) in presence of its impurity, 4-hydroxybenzohydrazide (4-HBH). In Vierordt's method, (E(1 cm)(1%)) values were calculated at 227 and 368 nm in the zero-order spectra of DRT and NIF. By derivative spectrophotometry, the zero-crossing method, drotaverine HCl was determined using the second derivative at 245 nm and the third derivative at 238 nm, while nifuroxazide was determined using the first derivative at 399 nm and the second derivative at 411 nm.
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