Upcycling of melanoidin-rich Chinese distilled spent grain through solid-state fermentation by Aspergillus awamori,Bioresource Technology

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Upcycling of melanoidin-rich Chinese distilled spent grain through solid-state fermentation by Aspergillus awamori
Bioresource Technology ( IF 9.7 ) Pub Date : 2024-11-13 , DOI: 10.1016/j.biortech.2024.131817
Shiqi Yang, Sultan Arslan-Tontul, Vincenzo Fogliano, Melania Casertano, Wenlai Fan, Yan Xu, Yao Nie, Arnau Vilas-Franquesa

This study investigated the upcycling of distilled spent grain (DSG), a melanoidin-rich by-product of the Chinese liquor industry, via fungal solid-state fermentation (SSF). Two fungi, Aspergillus oryzae and Aspergillus awamori, were tested, with A. awamori growing better on DSG than A. oryzae. SSF with A. awamori increased the concentration of water-soluble protein and phenolic compounds in DSG extracts by 46.5 % and 52.5 %, respectively, and reduced melanoidin level by 73.5 % w/w of DSG, suggesting A. awamori could metabolize melanoidins. Submerged fermentation (SmF) using isolated DSG melanoidins as sole carbon and nitrogen sources confirmed this observation. After 3 days of fermentation, A. awamori and A. oryzae biomass reached 2.5 g/L and 1.5 g/L, quenching melanoidin color by 24.4 % and 12.4 %, respectively. SmF by A. awamori also released free arabinose, glucose, and xylose. Data highlighted the possibility of converting melanoidins into edible mycelia resources, potentially applicable to various melanoidin-rich food by-products.

更新日期：2024-11-13

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