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Clinical Chemistry 31: 714-717, 1985;
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Clinical Chemistry, Vol 31, 714-717, Copyright © 1985 by American Association for Clinical Chemistry

Fluorometric assay for phospholipase A2 in serum

T Thuren, JA Virtanen, M Lalla and PK Kinnunen

In this fluorometric assay for phospholipase A2 (EC 3.1.1.4) in serum we use the fluorescent phospholipid analog 1-octacosanyl-2-(pyren-1- yl)hexanoyl-sn-glycero-3-phosphatid yl monomethyl ester as substrate. The optimized conditions are: 28 mumol of the substrate per liter of Tris buffer (20 mmol/L, pH 7.4). The hydrolytic reaction is allowed to proceed for 30 min at 37 degrees C. The fluorescent reaction product, (pyren-1-yl)hexanoic acid, is then separated from the unreacted substrate by liquid-liquid phase partition. The concentration of the liberated fatty acid analog is determined fluorometrically. The detection limit is approximately 6 pmol min-1 mL-1. Forty duplicate samples can be assayed in about 2 h. The activity of this enzyme in serum of 20 healthy volunteers averaged 69 pmol min-1 mL-1. For seven patients with clinically diagnosed pancreatitis the average activity was 1092 pmol min-1 mL-1.


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M. Rytömaa and P. K. J. Kinnunen
Reversibility of the Binding of Cytochrome c to Liposomes
J. Biol. Chem., February 17, 1995; 270(7): 3197 - 3202.
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Copyright © 1985 by the American Association for Clinical Chemistry.