Drinan D F, Robin S, Cogan T M
Appl Environ Microbiol. 1976 Apr;31(4):481-6. doi: 10.1128/aem.31.4.481-486.1976.
The effect of citrate on production of diacetyl and acetoin by four strains each of heterofermentative and homofermentative lactic acid bacteria capable of utilizing citrate was studied. Acetoin was quantitatively the more important compound. The heterofermentative bacteria produced no acetoin or diacetyl in the absence of citrate, and two strains produced traces of acetoin in its presence. Citrate stimulated the growth rate of the heterofermentative lactobacilli. Acidification of all heterofermentative cultures with citric acid resulted in acetoin production. Destruction of accumulated acetoin appeared to coincide with the disappearance of citrate. All homofermentative bacteria produced more acetoin and diacetyl in the presence of citrate than in its absence. Citrate utilization was begun immediately by the streptococci but was delayed until at least the middle of the exponential phase in the case of the lactobacilli.
研究了柠檬酸盐对四种能够利用柠檬酸盐的异型发酵和同型发酵乳酸菌产生双乙酰和乙偶姻的影响。从数量上看,乙偶姻是更重要的化合物。在没有柠檬酸盐的情况下,异型发酵细菌不产生乙偶姻或双乙酰,有两种菌株在有柠檬酸盐时产生微量乙偶姻。柠檬酸盐刺激了异型发酵乳酸菌的生长速率。用柠檬酸将所有异型发酵培养物酸化会导致乙偶姻的产生。积累的乙偶姻的破坏似乎与柠檬酸盐的消失同时发生。所有同型发酵细菌在有柠檬酸盐时比没有柠檬酸盐时产生更多的乙偶姻和双乙酰。链球菌立即开始利用柠檬酸盐,但对于乳酸菌来说,利用柠檬酸盐会延迟到至少指数期中期。