An in vitro comparison of microdialysis relative recovery of Met- and Leu-enkephalin using cyclodextrins and antibodies as affinity agents

by Fletcher, Heidi J.; Stenken, Julie Ann

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Cyclodextrins and antibodies have been used as affinity agents to improve relative recovery during microdialysis sampling. Two neuropeptides, methionine-enkephalin (ME) and leucine-enkephalin (LE), were chosen to compare the use of cyclodextrins and antibodies as possible affinity agents for improving their relative recovery across polycarbonate and polyethersulforre membranes during in vitro sampling. Cyclodextrins (CD) including beta-CD, 2-hydroxypropyl-beta-cyclodextrin (2HP beta-CD), and gamma-CD gave improvements of relative recovery for both peptides of less than 2-fold as compared to controls. Comparisons of relative recovery between tyrosine-glycine-glycine, tyrosine, and phenylalanine using different cyclodextrins in the perfusion fluid were also obtained. Inclusion of an antibody against met-enkephalin in the microdialysis perfusion fluid resulted in relative recovery increases of up to 2.5-fold. These results show that using antibodies as affinity agents during microdialysis sampling may be more effective agents to improve the relative recovery of these opioid neuropeptides. (c) 2008 Elsevier B.V. All rights reserved.

Journal
Analytica Chimica Acta
Volume
620
Issue
1-2
Year
2008
Start Page
170
ISBN/ISSN
0003-2670
PMID
18558138
DOI
10.1016/j.aca.2008.05.028