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. 1973 Nov;26(11):821–825. doi: 10.1136/jcp.26.11.821

The ortho-nitrophenol (ONPG) test and acid from lactose in Gram-negative genera

S P Lapage 1,1, Androulla Efstratiou 1, L R Hill 1
PMCID: PMC477897  PMID: 4587939

Abstract

The results are given of the ortho-nitrophenol test for beta-galactosidase production (ONPG test) on 588 strains of 123 aerobic species of bacteria, representing 30 genera. Apart from some strains of Erwinia herbicola (synonym Chromobacterium typhiflavum) and of Yersinia spp, these strains were not members of the Enterobacteriaceae, in which family the ONPG test is widely used and well documented. The strains were also tested for acid production from 1, 5, and 10% lactose and the findings are discussed in relation to the ONPG test.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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