A highly sensitive ELISA for the quantification of polymyxin B sulfate in human serum.

Abstract:

:A highly sensitive ELISA for the determination of polymyxin B sulfate (PMB) was developed which is capable of measuring as low as 32 pg/ml. Anti-PMB antibody was obtained by immunizing rabbits with PMB conjugated with mercaptosuccinyl bovine serum albumin (MS. BSA) using N-(gamma-maleimidobutyryloxy) succinimide (GMBS) as a heterobifunctional coupling agent. An enzyme marker was similarly prepared by coupling PMB with horseradish peroxidase (HRP) employing GMBS. This ELISA showed very low reactivity with the PMB analogue, polymyxin E (0.05%). The values for PMB concentration detected by this assay were comparable with those detected by the bioassay. Moreover, the ELISA was about 10,000 times more sensitive in detecting PMB at lower concentrations. Serum PMB concentration after the oral administration of a PMB tablet to human subjects was determined by the ELISA. PMB was rapidly absorbed from the gastrointestinal tract after the administration, then slowly decreased. These results indicate that the ELISA may be a valuable tool for studies of the pharmacokinetics and pharmacodynamics of the anti-endotoxin drug, PMB.

journal_name

Biol Pharm Bull

authors

Saita T,Yoshida M,Nakashima M,Matsunaga H,Fujito H,Mori M

doi

10.1248/bpb.22.1257

subject

Has Abstract

pub_date

1999-12-01 00:00:00

pages

1257-61

issue

12

eissn

0918-6158

issn

1347-5215

journal_volume

22

pub_type

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