This study aimed to investigate the effect of different concentrations of yeast in making tempeh from seed karet.Rancangan completely randomized (CRD) was used with two (2) yeast replication factor I concentrations (K) comprises 4 levels, yaituK1 = 0.2%, K2 = 0.4%, 0.6% = K3, and K4 = 0.8%. factor of 2 long fermentation (L) comprises 4 levels ie L1 = 12 hours = 24 hours L2, L3 = 36jam, L4 = 48 hours. The concentration of yeast members very real effect on carbohydrate carbohydrates where K1 is the highest at 8.850% was the highest carbohydrate fermentation contained in L1 is 8.360%. Keywords: tempeh, beans, yeast, fermentation
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