Stability of the paraoxonase phenotyping ratio in collections of human sera with differing storage times.
Results from automated testing of 673 human sera, divided into four batches by duration of storage at -20 degrees C, indicated that paraoxon-hydrolysing activity, a, decreased with increased storage time. By contrast, the paraoxonase phenotyping ratio, c/b, a ratio designating enzyme activation by Na+ in the presence of Ca2+, was stable over a four year storage period.
D043303:Aryldialkylphosphatase; D001793:Blood Preservation; D005828:Genetics, Population; D006801:Humans; D010261:Paraoxon; D010641:Phenotype; D010744:Phosphoric Monoester Hydrolases / Q000097:blood* / Q000235:genetics; D013997:Time Factors
D010744:Phosphoric Monoester Hydrolases; D043303:Aryldialkylphosphatase; D010261:Paraoxon