نتایج جستجو برای: isocratic

تعداد نتایج: 1335  

Journal: :Journal of chromatography. A 2006
Adam P Schellinger Peter W Carr

Chromatographers are cautioned to avoid gradient elution when isocratic elution will do. In this work, we compared the analytical properties of gradient and isocratic separations of a sample which can be done quite readily under isocratic conditions. We found that gradient elution gave a shorter overall analysis with similar resolution of the critical pair compared to isocratic elution without ...

Journal: :Clinical chemistry 1990
T G Rosano R T Ambrose A H Wu T A Swift P Yadegari

We describe a "high-performance" liquid chromatographic (HPLC) method for accurately determining creatinine in serum. After prechromatographic precipitation of protein, we performed isocratic ion-exchange chromatography with ultraviolet detection (234 nm). Analytical results showed linearity up to 1770 mumol/L, a detection limit of 22 mumol/L, an average analytical recovery of 101%, and a CV ra...

Journal: :Toxicon : official journal of the International Society on Toxinology 2001
F M Ferreira J M Franco Soler M L Fidalgo P Fernández-Vila

The presence of paralytic shellfish poisoning (PSP) toxins in cultures of Aphanizomenon flos-aquae, isolated from the Crestuma-Lever reservoir, was found by reversed phase high performance liquid chromatography employing two isocratic elution systems for the separation of PSP toxins. With the first isocratic elution protocol, the presence of apolar toxins as saxitoxin, decarbamoyl saxitoxin and...

2003
Kevin L. Kelly Bruce A. Kimball John J. Johnston

A novel detection method for the cardiac glycosides digitoxin, digoxin, and their metabolites is described. Both isocratic and gradient water-acetonitrile elutions were employed with an octadecylsilane column. The effluent was monitored by integrated pulsed amperometry in an alkaline medium (pH> 12) by adding sodium hydroxide post-column. Using isocratic elution, peak responses were linear from...

Journal: :Analytica chimica acta 2009
Dean Lee Steve Rumbelow S Kim Ratanathanawongs Williams

A two-step HPLC separation that combines isocratic and gradient elution has been developed for the analysis of trace impurities in fatty alcohol ethoxylates (FAEs). Quantitative estimates of the early eluting impurities were obtained from a calibration curve based on the responses of an evaporative light scattering detector (ELSD). Isocratic conditions were used to elute the impurities and grad...

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