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This study was carried out to investigate the effects of Panax ginseng, Ganoderma lucidum extract and crude polysaccharide of G. lucidum on the growth of lactic acid bacteria. P. ginseng extract contained 60.7% carbohydrate and 27.5% protein, whereas G. lucidum contained 35.9% carbohydrate and 46.3% protein. The total sugar and protein content of crude polysaccharide of G. lucidum were 47.2% and 15.2%, respectively. Two amino acids(Arg, Trp) were detected in P. ginseng extract and 11 amino acids(Arg, Trp, Ala, Lys, Ser, etc. ) in G. lucidum extract. By the addition of P. ginseng, G. lucidum extract and crude polysaccharide, the growth of lactic acid bacteria was increased obviously in comparison to that in Tryptone-glucose control media. P. ginseng was more effective on the growth of L. casei and C. lucidum was more effective on that of S. thermophilus. The effect of free amino acids on the growth of lactic acid bacteria was also examined. Argi-nine and lysine stimulated the growth of L. casei, whereas lysine, serine, arginine, and glutamic acid stimulated the growth of S. thermophilus.
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