초록
<P><B>Abstract</B></P> <P>Simultaneous saccharification and cofermentation (SSCF) of <I>Curcuma longa</I> waste biomass obtained after turmeric extraction to <SMALL>L</SMALL>- and <SMALL>D</SMALL>-lactic acid by <I>Lactobacillus coryniformis</I> and <I>Lactobacillus paracasei</I>, respectively, was investigated. This is a rich, starchy, agro-industrial waste with potential for use in industrial applications. After optimizing the fermentation of the biomass by adjusting nitrogen sources, enzyme compositions, nitrogen concentrations, and raw material concentrations, the SSCF process was conducted in a 7-l jar fermentor at 140g dried material/L. The maximum lactic acid concentration, average productivity, reducing sugar conversion and lactic acid yield were 97.13g/L, 2.7g/L/h, 95.99% and 69.38g/100g dried material for <SMALL>L</SMALL>-lactic acid production, respectively and 91.61g/L, 2.08g/L/h, 90.53% and 65.43g/100g dried material for <SMALL>D</SMALL>-lactic acid production, respectively. The simple and efficient process described in this study could be utilized by <I>C. longa</I> residue-based lactic acid industries without requiring the alteration of plant equipment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A method for <SMALL>L</SMALL>- and <SMALL>D</SMALL>-lactic acid production from waste <I>Curcuma longa</I> biomass. </LI> <LI> The method produces <SMALL>L</SMALL>-lactic acid at 97.13g/L with productivity of 2.7g/L/h. </LI> <LI> The method produces <SMALL>D</SMALL>-lactic acid at 91.61 97.13g/L with productivity of 2.08g/L/h. </LI> <LI> This economical lactic acid production process using a renewable biomass has potential for industrial applications. </LI> </UL> </P>