In vitro characterization of an in situ microdialysis sampling assay for elastase activity detection.
J Pharm Biomed Anal
; 40(5): 1041-7, 2006 Mar 18.
Article
em En
| MEDLINE
| ID: mdl-16242888
ABSTRACT
A microdialysis sampling method has been developed to detect the in vitro presence of a proteolytic enzyme, porcine elastase, external to a microdialysis probe. Elastase converts the substrate, succinyl(Ala)(3)-p-nitroanilide (suc(Ala)(3)-p-NA), to p-nitroaniline (p-NA). The substrate, suc(Ala)(3)-p-NA, was locally delivered through the microdialysis probe to external solutions containing different elastase activities (0.025-0.5 units/mL). The product, p-NA, was recovered back into the probe. Dialysates containing both suc(Ala)(3)-p-NA and p-NA were quantified using HPLC-UV. Different microdialysis suc(Ala)(3)-p-NA extraction efficiencies (EE) were observed among different elastase-containing solutions (buffer and 0.3% agar solutions). The p-NA concentrations recovered back into the microdialysis probe correlated with the elastase activity external to the microdialysis probe. The greatest fraction of p-NA recovered as compared to substrate lost occurred with the highest flow rate used (5.0 microL/min). However, the highest concentrations of p-NA recovered occurred at the lowest flow rates. This method may allow for microdialysis sampling to be used as a means to study localized enzyme activity.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Elastase Pancreática
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
J Pharm Biomed Anal
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Estados Unidos