Zy. Ozbas et Sa. Aytac, BEHAVIOR OF YERSINIA-ENTEROCOLITICA AND AEROMONAS-HYDROPHILA IN SKIM MILK DURING FERMENTATION BY VARIOUS LACTOBACILLI, Zeitschrift fur Lebensmittel-Untersuchung und -Forschung, 202(4), 1996, pp. 324-328
In this study, behaviour of Yersinia enterocolitica and Aeromonas hydr
ophila in skim milk during fermentation by various Lactobacillus sp. w
ere determined. pH values of the skim milk samples were also examined
during fermentation. The amount of produced lactic acid and diacetyl/a
cetoin productions of the Lactobacillus sp. were estimated. Antimicrob
ial effects of the lactobacilli on Y. enterocolitica and A. hydrophila
were also determined by an agar diffusion method. While Y. enterocoli
tica was not inhibited and grew during fermentation, A. hydrophila was
inhibited, in part, and the growth was retarded. Results were support
ed by the agar diffusion method for Y. enterocolitica, whereas inhibit
ion activity was not found for A. hydrophila. The highest lactic acid
productions were estimated in L. bulgaricus (7.50 mg/ml) and L. acidop
hilus (5.63 mg/ml) and four out of six Lactobacillus sp. were found to
be diacetyl/acetoin producers.