Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7079737 | Bioresource Technology | 2014 | 9 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Cuong Mai Nguyen, Thanh Ngoc Nguyen, Gyung Ja Choi, Yong Ho Choi, Kyoung Soo Jang, Youn-Je Park, Jin-Cheol Kim,