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Comparative Study
Journal Article
Comparison of limulus amebocyte lysates and correlation with the United States Pharmacopeial pyrogen test.
Applied and Environmental Microbiology 1977 June
Six limulus amebocyte lysate (LAL) preparations obtained from five different suppliers were evaluated for sensitivity, dependability, cost, convenience of use, and correlation with the United States Pharmacopeial (USP) rabbit pyrogen test method. Endotoxins from various gram-negative microorganisms were used for the evaluation. Major differences among the LAL preparations lie in the area of sensitivity. Differences, up to 100-fold, exist in the sensitivity of the various LAL preparations to the same endotoxin. The LAL tests in general were 3 to 300 times more sensitive than was the USP rabbit pyrogen test method. The LAL and the USP rabbit pyrogen test data correlated well when the endotoxin in a relatively pure and undegraded form was examined. However, large discrepancies in correlation were found when partially degraded endotoxins were compared. One LAL preparation responded to both intact and degraded endotoxin, whereas others responded only to intact endotoxin; the latter closely correlated with the febrile response of the rabbit. Therefore, proper selection of an LAL preparation is important for its application in clinical, pharmaceutical, public health, and environmental areas.
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