Biomaterial Database

[Comparison of three miniaturized Limulus-amoebocyte-lysate methods]. 1988

C Weber-Frick, and W Schmidt-Lorenz

Laboratorium für Lebensmittel-Mikrobiologie, Institut für Lebensmittelwissenschaft Eidgenössische Technische Hochschule, Zürich.

Comparative examinations with three different micro-models for the LAL-test methods,--namely the capillary test, Endotoxin-test "Mini" and Coatest-Endotoxin-method-, tested with 11 Enterobacteriaceae- and 6 Pseudomonas-type-strains and isolates from foods gave only slight differences for the endotoxin content. Out of 250 single measurements per test method the capillary test as well as the Coatest-Endotoxin-method gave count limits between 2.8 X 10(1) and 7.4 X 10(3) CFU/ml. For the endotoxin-test method "Mini" the limits were one log unit higher-namely between 8.6 X 10(2) and 5.0 X 10(4) CFU/ml. The maximum values for count limits of all three methods correspond to approximately 1 ng Endotoxin. For the two gel test methods a relative error of +/- 15% has to be taken into account; for the chromogen method however, the relative error lies within +/- 25%, if the concentration is 0.0125 ng LPS/ml or lower. Between 0.025 and 0.1 ng LPS/ml or 0.075 and 0.1 ng LPS/ml the relative error is reduced to +/- 16% and +/- 5% respectively. The study has shown that the three micro tests in question as tested with pure cultures give comparable and reproducible results; inspite of the high relative error.

UI	MeSH Term	Description	Entries
D008033	Limulus Test	Sensitive method for detection of bacterial endotoxins and endotoxin-like substances that depends on the in vitro gelation of Limulus amebocyte lysate (LAL), prepared from the circulating blood (amebocytes) of the horseshoe crab, by the endotoxin or related compound. Used for detection of endotoxin in body fluids and parenteral pharmaceuticals.	Limulus Tests,Test, Limulus,Tests, Limulus
D011237	Predictive Value of Tests	In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.	Negative Predictive Value,Positive Predictive Value,Predictive Value Of Test,Predictive Values Of Tests,Negative Predictive Values,Positive Predictive Values,Predictive Value, Negative,Predictive Value, Positive
D011549	Pseudomonas	A genus of gram-negative, aerobic, rod-shaped bacteria widely distributed in nature. Some species are pathogenic for humans, animals, and plants.	Chryseomonas,Pseudomona,Flavimonas
D004731	Endotoxins	Toxins closely associated with the living cytoplasm or cell wall of certain microorganisms, which do not readily diffuse into the culture medium, but are released upon lysis of the cells.	Endotoxin
D004755	Enterobacteriaceae	A family of gram-negative, facultatively anaerobic, rod-shaped bacteria that do not form endospores. Its organisms are distributed worldwide with some being saprophytes and others being plant and animal parasites. Many species are of considerable economic importance due to their pathogenic effects on agriculture and livestock.	Coliform Bacilli,Enterobacteria,Ewingella,Leclercia,Paracolobactrum,Sodalis
D005516	Food Microbiology	The presence of bacteria, viruses, and fungi in food and food products. This term is not restricted to pathogenic organisms: the presence of various non-pathogenic bacteria and fungi in cheeses and wines, for example, is included in this concept.	Microbiology, Food
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia