Determination of thermodynamic parameters in reversed phase chromatography for polyethylene glycols and their methyl ethers in different mobile phases

2010 ◽  
Vol 33 (4-5) ◽  
pp. 464-474 ◽  
Author(s):  
Cuong Nguyen Viet ◽  
Bernd Trathnigg
2020 ◽  
Vol 35 (3) ◽  
pp. 560-566
Author(s):  
Jakub Karasiński ◽  
Cuc Thi Nguyen-Marcińczyk ◽  
Marcin Wojciechowski ◽  
Ewa Bulska ◽  
Ludwik Halicz

A robust and sensitive method for the precise isotopic analysis of 53Cr/50Cr during Cr(iii) oxidation by coupling ion pair reversed-phase chromatography and Multicollector Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS) is presented.


2001 ◽  
Vol 84 (3) ◽  
pp. 634-639 ◽  
Author(s):  
John J Johnston ◽  
Margaret J Goodall ◽  
Jerome C Hurley ◽  
Christi A Yoder ◽  
Lowell A Miller

Abstract Liquid chromatographic (LC) methods were developed for quantitating the potential avian contraceptive DiazaCon in quail feed and serum. DiazaCon was extracted from ground quail feed with basic n-butyl chloride. The n-butyl chloride extract was evaporated to dryness. The DiazaCon residues were dissolved in an aqueous methanolic ion pairing solution and quantitated by LC at 206 nm. Avian sera was combined with an equal volume of a pH 4 aqueous solution of ion pairing reagent and filtered to remove interfering proteins. DiazaCon was quantitated by LC. Mean recoveries for 500 and 2000 ppm fortified feed were 89.1 and 91.0%, respectively. The mean recovery for sera fortified at 5 levels ranging from 35 to 2000 ppm was 84.9%. Method limits of detection were approximately 14 and 13 ppm for feed and sera, respectively.


The Analyst ◽  
1996 ◽  
Vol 121 (11) ◽  
pp. 1677-1682 ◽  
Author(s):  
Inmaculada Rapado-Martínez ◽  
M. Celia García-Alvarez-Coque ◽  
Rosa M. Villanueva-Camañas

Primula veris L. (Primulaceae)is healing plant, whose root is officially used to treat cough associated with cold. Other reported indications are respiratory, thoracic and mediastinal disorders. These effects are result of high contents of triterpenoid saponins and phenolic glycosides. Primula acid 1 (PA 1, also primulasaponin 1) is main active component in Primula elatior L. This paper presents an optimized high pressure liquid chromatography (HPLC) method for the determination of primula acid 1 content in Primulae extractum fluidum. TLC was performed to check for the presence of the substance of interest. The determination was performed by reversed phase chromatography using C18 as a stationary phase. The mobile phase used for separation consisted of 0.2% H3PO4 and acetonitrile. This method was validated through different parameters. The detection limit for primula acid 1 was LD=10.41 µg/ml, and the quantification limitwas LQ=34.69 µg/ml. In order to determine the content of primula acid 1, a calibration curve was constructed, and the content of primula acid 1 was calculated by the equation of the calibration curve and was 0.2793 mg per gram of extract. The results and simple preparation of sample show that HPLC is the method of choice for this type of analysis.


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