Department of Process Engineering, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa.
Department of Process Engineering, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa.
Bioresour Technol. 2016 Mar;203:181-9. doi: 10.1016/j.biortech.2015.12.045. Epub 2015 Dec 19.
Very high gravity hydrolysis-fermentation of whole and decorticated sorghum grains were compared using conventional and cold hydrolysis methods to assess the extent by which decortication could minimize enzymes dosages and affect the quality of the distillers' dried grains with solubles (DDGS). All processing configurations achieved ethanol concentrations between 126 and 132 g/L (16.0-16.7%v/v), although decortication resulted in a decreased ethanol yield. Decortication resulted in a decreased volumetric productivity during warm processing from 1.55 to 1.25 g L(-1)h(-1), whereas the required enzyme dosage for cold processing was decreased from 250 to 221 μl/100 gstarch. Cold processing decreased the average acid detergent fibre (ADF) from 35.59% to 29.32% and neutral detergent fibre (NDF) from 44.04% to 32.28% in the DDGS compared to the conventional (warm) processing. Due to lower enzyme requirements, the use of decorticated grains combined with cold processing presents a favourable process configuration and source of DDGS for non-ruminants.
采用常规水解法和冷水解法对比了整粒高粱和去皮高粱的超高固形物水解-发酵，以评估去皮程度可在多大程度上最小化酶用量并影响干酒糟及其可溶物（DDGS）的质量。所有加工配置均实现了 126-132 g/L 的乙醇浓度（16.0-16.7%v/v），尽管去皮会导致乙醇产量降低。去皮会导致热加工过程中容积生产率从 1.55 降至 1.25 g L(-1)h(-1)，而冷加工所需的酶用量从 250 降至 221 μl/100 g 淀粉。与常规（热）加工相比，冷加工使 DDGS 中的平均酸性洗涤剂纤维（ADF）从 35.59%降至 29.32%，中性洗涤剂纤维（NDF）从 44.04%降至 32.28%。由于酶的需求量较低，因此使用去皮高粱并结合冷加工为反刍动物提供了一种有利的加工配置和 DDGS 来源。
