Linossier and Dousset27 showed that the yeast Candida kefir was capable of producing
malic acid, citric acid, and pyruvic acid in milk with Lb. kefir, but levels of
lactic acid, fumaric acid, and butyric acid were low. Citric acid was not found after
70 h of fermentation. There appeared to be a symbiotic relationship between the
C. kefir and the Lb. kefir, as the growth of the bacterium was enhanced by the presence
of the yeast in the media. The addition of C. kefir at levels as low as 0.5% of the
total microbial population stimulated the growth of Lb. kefir.