Add time:08/12/2019         Source:sciencedirect.com

The sites to which valproic acid and its main unsaturated metabolites (2-en-2-propyl pentanoic acid and 4-en-2-propyl pentanoic acid) bind to on human albumin were investigated by (1) measuring their ability to displace the fluorescent probes warfarin and dansylsarcosine (cas 1093-96-5) and (2) by assessing the extent to which they inhibited the hydrolysis of 4-nitrophenyl acetate. Valproate and its metabolites displaced both warfarin and dansylsarcosine, and they also inhibited the hydrolysis of 4-nitrophenyl acetate. The order of potency for inhibition of both binding and hydrolysis was: 2-en-2-propyl pentanoic acid > 4-en-2-propyl pentanoic acid ⩾ valproate. It is concluded that valproic acid and its unsaturated metabolites can displace ligands from the warfarin binding site (site I) and the benzodiazepine/indole binding site (site II), but the primary interaction is with site II. Furthermore, the introduction of a double bond into the carbon backbone of valproate increases affinity for albumin at both sites.

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