Production of L-lactic Acid from Biomass Wastes Using Scallop Crude Enzymes and Novel Lactic Acid Bacterium

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  • YANAGISAWA Mitsunori
    Department of International Development Engineering, Tokyo Institute of Technology
  • NAKAMURA Kanami
    Department of International Development Engineering, Tokyo Institute of Technology
  • NAKASAKI Kiyohiko
    Department of International Development Engineering, Tokyo Institute of Technology

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  • バイオマス系廃棄物と廃棄物由来酵素を用いたＬ‐乳酸の生産
  • バイオマス系廃棄物と廃棄物由来酵素を用いたL-乳酸の生産
  • バイオマスケイ ハイキブツ ト ハイキブツ ユライ コウソ オ モチイタ L ニュウサン ノ セイサン

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Abstract

In the present study, biomass waste raw materials including paper mill sludge, bamboo, sea lettuce, and shochu residue (from a distiller) and crude enzymes derived from inedible and discarded scallop parts were used to produce L-lactic acid for the raw material of biodegradable plastic poly-lactic acid. The activities of cellulase and amylase in the crude enzymes were 22 and 170units/L, respectively, and L-lactic acid was produced from every of the above mentioned biomass wastes, by the method of liquid-state simultaneous saccharification and fermentation (SSF) . The L-lactic acid concentrations produced from sea lettuce and shochu residue, which contain high concentration of starch were 3.6 and 9.3g/L, respectively, and corresponded to greater than 25% of the conversion of glucans contained in these biomass wastes. Furthermore, using the solid state SSF method, concentrations as high as 13g/L of L-lactic acid were obtained from sea lettuce and 26g/L were obtained from shochu residue.

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