Effect of Several Pretreatments on the Lactic Acid Production from Exhausted Sugar Beet Pulp

被引:11
作者
Marzo, Cristina [1 ]
Belen Diaz, Ana [1 ]
Caro, Ildefonso [1 ]
Blandino, Ana [1 ]
机构
[1] Univ Cadiz, Fac Sci, Dept Chem Engn & Food Technol, IVAGRO, Campus Univ Puerto Real, Puerto Real 11510, Spain
关键词
sugar beet pulp; biological pretreatment; alkaline hydrogen peroxide pretreatment; thermochemical pretreatment; enzymatic hydrolysis; lactic acid fermentation; ENZYMATIC-HYDROLYSIS; MICROBIAL PRETREATMENT; ALKALINE PEROXIDE; RICE HULLS; ENHANCE;
D O I
10.3390/foods10102414
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
Exhausted sugar beet pulp (ESBP), a by-product of the sugar industry, has been used as a substrate to produce lactic acid (LA). Due to the fact that ESBP contains a high percentage of pectin and hemicellulose, different pretreatments were studied to solubilize them and to facilitate the access to cellulose in the subsequent enzymatic hydrolysis. Several pretreatments were studied, specifically biological, oxidant with alkaline hydrogen peroxide (AHP), and thermochemical with acid (0.25, 0.5, or 1% w/v of H2SO4). Pretreated ESBP was enzymatically hydrolysed and fermented with the strain Lactiplantibacillus plantarum for LA production. The hydrolysis was carried out with the commercial enzymes Celluclast, pectinase, and xylanase, for 48 h. After that, the hydrolysate was supplemented with yeast extract and calcium carbonate before the bacteria inoculation. Results showed that all the pretreatments caused a modification of the fibre composition of ESBP. In most cases, the cellulose content increased, rising from 25% to 68% when ESBP was pretreated thermochemically at 1% w/v H2SO4. The production of LA was enhanced when ESBP was pretreated thermochemically. However, it was reduced when biological and AHP pretreatments were applied. In conclusion, thermochemical pretreatment with 1% w/v H2SO4 had a positive impact on the production of LA, increasing its concentration from 27 g/L to 50 g/L.
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页数:12
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