Selection of suitable mineral acid and its concentration for biphasic dilute acid hydrolysis of the sodium dithionite delignified Prosopis juliflora to hydrolyze maximum holocellulose

• Published in: Bioresource technology Vol. 202; pp. 231 - 237
• Main Authors: Naseeruddin, Shaik, Desai, Suseelendra, Venkateswar Rao, L.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.02.2016
• Subjects: Acids - chemistry; Acids - pharmacology; Cellulose - chemistry; Cellulose - metabolism; Dithionite - chemistry; Dithionite - pharmacology; Holocellulose; Hydrochloric acid; Hydrochloric Acid - chemistry; Hydrochloric Acid - pharmacology; Hydrolysis - drug effects; Inhibitors; Lignin - chemistry; Lignin - metabolism; Minerals - chemistry; Minerals - pharmacology; Phosphoric acid; Prosopis - chemistry; Prosopis - drug effects; Prosopis - metabolism; Prosopis juliflora; Sulfuric acid; Sulfuric Acids - chemistry; Sulfuric Acids - pharmacology; Hydrochloric acid; Phosphoric acid; Inhibitors; Sulfuric acid; Holocellulose
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2015.12.025

•Acid hydrolysis of delignified substrate with three different mineral acids.•Selection based on maximum hydrolysis with release of fewer amounts of inhibitors.•Variation of reaction time and temperature for maximum saccharification. Two grams of delignified substrate at 10% (w/v) level was subjected to biphasic dilute acid hydrolysis using phosphoric acid, hydrochloric acid and sulfuric acid separately at 110°C for 10min in phase-I and 121°C for 15min in phase-II. Combinations of acid concentrations in two phases were varied for maximum holocellulose hydrolysis with release of fewer inhibitors, to select the suitable acid and its concentration. Among three acids, sulfuric acid in combination of 1 & 2% (v/v) hydrolyzed maximum holocellulose of 25.44±0.44% releasing 0.51±0.02g/L of phenolics and 0.12±0.002g/L of furans, respectively. Further, hydrolysis of delignified substrate using selected acid by varying reaction time and temperature hydrolyzed 55.58±1.78% of holocellulose releasing 2.11±0.07g/L and 1.37±0.03g/L of phenolics and furans, respectively at conditions of 110°C for 45min in phase-I & 121°C for 60min in phase-II.