Institute of Technology of Agricultural Products, ELGO DIMITRA, Sof. Venizelou 1, 14123, Athens, Greece.
Laboratory Nutritional Physiology & Feeding, Department of Animal Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece.
Environ Sci Pollut Res Int. 2022 Apr;29(20):29562-29569. doi: 10.1007/s11356-021-15495-w. Epub 2021 Jul 23.
Brewers' spent grain (BSG) represents the 85% of the total residue produced during the beer brewing process, with a global annual production volume exceeding 30 Mtons. The current study concerns the application of solid state fermentation (SSF) as a bioprocess where the nutritional value of BSG is improved for further use as animal feed with increased value. The investigated SSF procedure was initiated by the edible fungi Pleurotus ostreatus, which constitutes a natural source of proteins, β-glucans, and various metabolites (vitamins, nutrients, etc.). Herein, the SSF of BSG resulted in a significant increase of protein content by 49.49%, a 10-fold increase of 1,3-1,6 β-glucans, and a respective reduction of cellulose by 11.42%. The application of this method is expected to provide some useful information on the utilization of BSG as substrate for fungi-initiated SSF, a bioprocess allowing the significant reduction of the environmental impact caused by the beer brewing industry and simultaneously producing animal feed with higher protein content and improved nutritional characteristics. Such studies contribute to confront the unavailability of proteinaceous animal feed observed in the last decade.
啤酒糟（BSG）占啤酒酿造过程中产生的总残渣的 85%，全球年总产量超过 3000 万吨。本研究关注固态发酵（SSF）的应用，作为一种生物过程，可以提高 BSG 的营养价值，进一步用作具有更高附加值的动物饲料。所研究的 SSF 程序由可食用真菌糙皮侧耳（Pleurotus ostreatus）启动，它是蛋白质、β-葡聚糖和各种代谢物（维生素、营养物质等）的天然来源。在此，BSG 的 SSF 导致蛋白质含量显著增加了 49.49%，1,3-1,6 β-葡聚糖增加了 10 倍，纤维素相应减少了 11.42%。预计该方法的应用将为利用 BSG 作为真菌启动 SSF 的底物提供一些有用信息，这种生物过程可以显著减少啤酒酿造业对环境的影响，同时生产出蛋白质含量更高、营养特性更好的动物饲料。这些研究有助于应对过去十年中观察到的蛋白质动物饲料短缺问题。
