Acid hydrolysis of Curcuma longa residue for ethanol and lactic acid fermentation.
This research examines the acid hydrolysis of Curcuma longa waste, to obtain the hydrolysate containing lactic acid and ethanol fermentative sugars. A central composite design for describing regression equations of variables was used. The selected optimum condition was 4.91% sulphuric acid, 122.68°C and 50 min using the desirability function under the following conditions: the maximum reducing sugar (RS) yield is within the limited range of the 5-hydroxymethylfurfural (HMF) and furfural concentrations. Under the condition, the obtained solution contained 144 g RS/L, 0.79 g furfural/L and 2.59 g HMF/L and was directly fermented without a detoxification step. The maximum product concentration, average productivity, RS conversion and product yield were 115.36 g/L, 2.88 g/L/h, 89.43% and 64% for L-lactic acid; 113.92 g/L, 2.59 g/L/h, 88.31% and 63.29% for D-lactic acid; and 55.03 g/L, 1.38 g/L/h, 42.66 and 30.57%, respectively, for ethanol using a 7-L jar fermenter.
Department of Green Chemistry and Environmental Biotechnology, University of Science and Technology, 217, Gajungro, Yuseong-gu, Daejeon 305-333, Republic of Korea; Research Center for Biobased Chemistry, Division of Convergence Chemistry, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea.
Cuong Mai
CM
Nguyen
Thanh Ngoc
TN
Nguyen
Gyung Ja
GJ
Choi
Yong Ho
YH
Choi
Kyoung Soo
KS
Jang
Youn-Je
YJ
Park
Jin-Cheol
JC
Kim
D000704:Analysis of Variance; D030024:Curcuma / Q000187:drug effects*; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation / Q000187:drug effects*; D006868:Hydrolysis / Q000187:drug effects; D019344:Lactic Acid / Q000378:metabolism*; D013464:Sulfuric Acids / Q000494:pharmacology*; D013997:Time Factors; D014866:Waste Products / Q000032:analysis
D013464:Sulfuric Acids; D014866:Waste Products; D019344:Lactic Acid; D000431:Ethanol; C033158:sulfuric acid
5-Hydroxymethylfurfural; Curcuma longa residue; Ethanol; Furfural; Lactic acid