Gong L, Feng D, Liu J, Yu Y, Wang J. Ionic liquid depolymerize the lignocellulose for the enzymatic extraction of feruloylated oligosaccharide from corn bran.
Food Chem X 2022;
15:100381. [PMID:
36211776 PMCID:
PMC9532712 DOI:
10.1016/j.fochx.2022.100381]
[Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 06/17/2022] [Accepted: 06/28/2022] [Indexed: 12/01/2022] Open
Abstract
ILs pretreatment enriched the extraction yield of conjugated phenols in corn bran.
[Amim]Ac is an excellent solvent for the depolymerization of corn bran lignocellulose.
[Amim]Ac pretreatment maintains the structure of feruloylated oligosaccharide.
The effect of phase volume ratio, settling time, temperatures and concentration were determined.
In this study, a new method was developed for feruloylated oligosaccharides (FOs) enzymatic hydrolysis extraction from corn bran, using ionic liquids (ILs) as the solvent for the depolymerization of dietary fiber. The 1-allyl-3-methylimidazolium acetate [Amim]Ac was the most effective IL among the eight evaluated ILs, which leads to a 1.5 times-higher total FOs content as compared with conventional non-pretreatment extraction. The optimum condition acquired by response surface methodology was 194.31 min, 143.08 °C, solid–liquid ratio of 1:20, and the concentration of 18.65%. The depolymerized biomass was characterized using SEM, FTIR and CLSM. The results confirmed that [Amim]Ac mainly enters the cavity among the lignocellulose and breaks linkages to release FOs by exposure binding sites of hemicellulose to hydrolysis enzymes. In particular, the linkages between ferulic acid and hemicellulose were not affected by ILs pretreatment. This study provides an efficient method for the preparation of conjugated phenols from lignocellulose.
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