Background:This study was conducted to evaluate the feed nutritional value of brewers’spent grain(BSG)residue resulting from protease aided protein removal.The nutritional value was measured as nutrient content,gas p...Background:This study was conducted to evaluate the feed nutritional value of brewers’spent grain(BSG)residue resulting from protease aided protein removal.The nutritional value was measured as nutrient content,gas production,nutrient digestibility and fermentation characteristics in batch culture.Results:Protein extraction process decreased content of crude protein but concentrated the neutral detergent fibre(NDF)and ferulic acid in BSG residue.The changes in the chemical composition of BSG residue varied with enzyme and enzyme dosage.Digestibility of dry matter(DMD)and NDF of residue differed among proteases.Increasing alcalase dosage linearly decreased DMD,whereas,the DMD linearly increased as everlase or flavourzyme dosage increased.Compared with BSG,the DMD,gas production and fermentation acid concentration of BSG residues were lower,whereas NDF digestibility was higher.Conclusions:The substantially increased NDF content and improved in vitro NDF digestibility due to protease hydrolysis suggest that BSG residue can be potentially exploited as a viable fibre source for ruminant feeding.展开更多
以啤酒糟为底物的厌氧发酵产氢技术可以同时实现废物资源再利用和清洁能源生产。为提高啤酒糟的产氢能力,探讨微波-盐酸预处理底物对厌氧发酵产氢的影响,将啤酒糟置于质量体积分数为的1%HCl中,在微波下辐射加热10 min,以未处理和微波-...以啤酒糟为底物的厌氧发酵产氢技术可以同时实现废物资源再利用和清洁能源生产。为提高啤酒糟的产氢能力,探讨微波-盐酸预处理底物对厌氧发酵产氢的影响,将啤酒糟置于质量体积分数为的1%HCl中,在微波下辐射加热10 min,以未处理和微波-盐酸热处理啤酒糟为底物进行批式厌氧发酵产氢试验研究。结果表明:微波-盐酸预处理能显著提升啤酒糟的糖化与产氢能力;预处理后,啤酒糟的初始还原糖浓度是未处理啤酒糟的30倍,最大氢气浓度由23.18%提高到34.18%,产氢率由25.76 m L/g提高到52.81 m L/g;修正的Gompertz方程可以很好地拟合累积产氢量随时间的变化;啤酒糟发酵过程中的挥发性脂肪酸以乙酸和丁酸为主。展开更多
The properties of extracellular cellulase obtained from Bacillus species (FIIRO Strain B223) on supplying cellulose from Brewers Spent Grain (BSG) were studied. Generally, a crude cellulase activity between 11,757 Uni...The properties of extracellular cellulase obtained from Bacillus species (FIIRO Strain B223) on supplying cellulose from Brewers Spent Grain (BSG) were studied. Generally, a crude cellulase activity between 11,757 Units to 13,930 Units was observed for both sources of carbon (BSG and crystalline cellulose). The optimum pH and temperature of 5.0, and 30°C - 40°C for both sources of carbon was observed. Heavy metals such as copper, zinc, and iron inhibited the activities of B223 cellulase while the cellulase activities on alkaline earth metal (manganese) were moderate. The co-factor behaviour of manganese ion was also established. Local production of cellulase in Nigeria using local raw materials such as Brewers Spent Grain reduces enzyme cost;cost of finished products and increases gross domestic products.展开更多
基金funded by AAFC Growing forward program(GF2#1542).
文摘Background:This study was conducted to evaluate the feed nutritional value of brewers’spent grain(BSG)residue resulting from protease aided protein removal.The nutritional value was measured as nutrient content,gas production,nutrient digestibility and fermentation characteristics in batch culture.Results:Protein extraction process decreased content of crude protein but concentrated the neutral detergent fibre(NDF)and ferulic acid in BSG residue.The changes in the chemical composition of BSG residue varied with enzyme and enzyme dosage.Digestibility of dry matter(DMD)and NDF of residue differed among proteases.Increasing alcalase dosage linearly decreased DMD,whereas,the DMD linearly increased as everlase or flavourzyme dosage increased.Compared with BSG,the DMD,gas production and fermentation acid concentration of BSG residues were lower,whereas NDF digestibility was higher.Conclusions:The substantially increased NDF content and improved in vitro NDF digestibility due to protease hydrolysis suggest that BSG residue can be potentially exploited as a viable fibre source for ruminant feeding.
文摘以啤酒糟为底物的厌氧发酵产氢技术可以同时实现废物资源再利用和清洁能源生产。为提高啤酒糟的产氢能力,探讨微波-盐酸预处理底物对厌氧发酵产氢的影响,将啤酒糟置于质量体积分数为的1%HCl中,在微波下辐射加热10 min,以未处理和微波-盐酸热处理啤酒糟为底物进行批式厌氧发酵产氢试验研究。结果表明:微波-盐酸预处理能显著提升啤酒糟的糖化与产氢能力;预处理后,啤酒糟的初始还原糖浓度是未处理啤酒糟的30倍,最大氢气浓度由23.18%提高到34.18%,产氢率由25.76 m L/g提高到52.81 m L/g;修正的Gompertz方程可以很好地拟合累积产氢量随时间的变化;啤酒糟发酵过程中的挥发性脂肪酸以乙酸和丁酸为主。
文摘The properties of extracellular cellulase obtained from Bacillus species (FIIRO Strain B223) on supplying cellulose from Brewers Spent Grain (BSG) were studied. Generally, a crude cellulase activity between 11,757 Units to 13,930 Units was observed for both sources of carbon (BSG and crystalline cellulose). The optimum pH and temperature of 5.0, and 30°C - 40°C for both sources of carbon was observed. Heavy metals such as copper, zinc, and iron inhibited the activities of B223 cellulase while the cellulase activities on alkaline earth metal (manganese) were moderate. The co-factor behaviour of manganese ion was also established. Local production of cellulase in Nigeria using local raw materials such as Brewers Spent Grain reduces enzyme cost;cost of finished products and increases gross domestic products.
