ヨーグルトスターターの共生　ＩＩ　　?EＳｔｒｅｐｔｏｃｏｃｃｕｓ　ｔｈｅｒｍｏｐｈｉｌｕｓ?Fの産生する?EＬａｃｔｏｂａｃｉｌｌｕｓ　ｂｕｌｇａｒｉｃｕｓ?F発育促進物質の分離および同定

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  • Isolation and Identification of Growth Factor of <i>Lactobacillus bulgaricus</i> Produced by <i>Streptococcus thermophilus</i>
  • Streptococcus thermophilus ノ サンセイスル Lac

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In the symbiotic growth of Lactobacillus bulgaricus and Streptococcus thermophilus in milk, the latter produced the growth stimulating substances of the former. The substances for L. bulgaricus were identified as formic and pyruvic acids. These two organic acids showed a synergistic effect on stimulation of acid production and growth of L. bulgaricus. These phenomena were found in all strains of L. bulgaricus in this study.<br> In the combination of two organic acids, formic acid was not replaced by other organic acids, but pyruvic acid was able to be replaced by oxaloacetic, fumaric, L-malic and α-ketoglutaric acid. The effect on stimulation of oxaloacetic and fumaric acid was nearly equal to that of pyruvic acid.

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