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An attempt to improve the SOS chromotest responses

✍ Scribed by J. C. Hoflack; J. F. Férard; P. Vasseur; C. Blaise

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
388 KB
Volume
13
Category
Article
ISSN
0260-437X

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✦ Synopsis

The SOS Chromotest was carried out on leachates of ten industrial wastes with the standard procedure and a miniaturized version with microplates. The two methods gave identical results in nine samples (eight negative and one positive). A simple additional manipulation is described for the identification of the false positive response that is frequently observed with complex mixtures. It involves challenging the SOS Chromotest bacteria with samples (having previously shown a positive genotoxic response) just before the enzymatic activities (i.e. P-galactosidase and alkaline phosphatase) are estimated colorimetrically. This additional step eliminates discrepancies between the results for the standard and the miniaturized procedures.

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