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Retention time

Discussions about HPLC, CE, TLC, SFC, and other "liquid phase" separation techniques.

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Hi everybody! I have the following problem: I am trying to identify Pentosidine in hydrolysed (6N HCl 24 h 110 °C) collagen samples using a Phenomenex Gemini C18 150x4.6 column. Mobile phase is 0.1% TFA and 0.1% in 100% CH3CN respectively. Gradient used ranges from 1 to 7% at 0.8ml/min in 30min. Collagen samples are dryed after acid hydrolysis and resuspended in 0.1% TFA. The Pentosidine standard is dissolved in 0.1% TFA. The retention time of the Pentosidine standard is 15min. Pentosidine in collagen samples comes at 17min. When I mix Pentosidine standard and collagen sample in a ratio of 1:1 the Pentosidine standard also elutes at 17min. Now my questions: Is it possible that remaining HCl has an influence on the retention time and if so what can I do about it? Many thanks for your help! Regards. Tillman
A semi-quick way to find out would be to prepare your standard in HCl, dry it, resuspend it and inject.
-- Tom Jupille
LC Resources / Separation Science Associates
tjupille@lcresources.com
+ 1 (925) 297-5374
2 posts Page 1 of 1

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