Suripto Dwi Yuwono and Sutopo Hadi
Keywords: onggok tapioca, lactic acid, Streptococcus bovis and fermentation.
Abstract: Onggok tapioca is a low value byproduct from tapioca industry. It provides a cheap source of starch and has potential for being applied as substrate in fermentations to produce lactic acid. Lactic acid production from onggok tapioca by Streptococcus bovis was investigated in order to reduce the manufacturing cost of lactic acid. Lactic acid yields were inversely proportional to initial onggok tapioca concentration within the experimental area (30-100 g/L). The highest lactic acid productivity in batch fermentation, 1.70 g/L.h was obtained with 50 g/L onggok tapioca. Lactic acid fermentation using onggok tapioca was significantly affected by yeast extract concentration. The maximum lactic acid productivity was obtained 2.13 g/L.h at 20 g/L of yeast extract.
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