V. Phalip et al., A METHOD FOR SCREENING DIACETYL AND ACETOIN-PRODUCING BACTERIA ON AGAR PLATES, Journal of basic microbiology, 34(4), 1994, pp. 277-280
A simple method for screening bacteria for diacetyl and acetoin produc
tion was developed. This method is based on the ability of diacetyl an
d acetoin to form a red insoluble complex with alpha-naphthol in the p
resence of creatine. Addition of carboxymethyl-cellulose containing ca
lcium citrate in the medium allowed discrimination between citrate uti
lizing and non-utilizing bacteria.