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A new reliable human blood treatment was established for quantitative endotoxin assay using synthetic chromogenic substrate [Boc-Leu-Gly-Arg-rho-nitroanilide]. Addition of perchloric acid in a final concentration of 1.25% to platelet-rich plasma or serum in a 2:1 volume ratio completely eliminated nonspecific amidase activities as well as inhibitors. By this method, the recovery of added endotoxin was nearly 100%, and was almost independent of sample dilutions and anticoagulants.
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