Highly efficient and sustainable bioconversion of cottonseed meal to high-value products through solid-state fermentation by protease-enhanced Streptomyces sp. SCUT-3

文献类型： 外文期刊

第一作者： Dai, Zhen-Jie

作者： Dai, Zhen-Jie;Zhang, Ming-Shu;Li, Zhi-Wei;Lu, De-Lin;Wu, Lei;Qin, Can;Wang, Hai-Ning;Luo, Xiao-Chun;Li, Zhi-Wei;Deng, Jun-Jin

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关键词： Streptomyces; Solid-state fermentation; Cottonseed meal; Protein recovery; Bioconversion

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 521 卷

页码：

收录情况： SCI

摘要： To address the escalating global protein demand, driven by a 9.7 billion projected population by 2050, this study established a protease-driven bioconversion platform using an engineered Streptomyces sp. strain with hyperproteolytic activity (452 U/mL) for cottonseed meal (CSM) valorization. Optimized solid-state fermentation (SSF) parameters (substrate-liquid ratio 1:1.5 w/v, 72-h fermentation) achieved 83.7 % protein recovery rate - the highest reported for oilseed meals, yielding 20.0 g free amino acids (FAAs) and 18.2 g soluble peptides (SPPs) (77 % < 2 kDa) per 100 g CSM. Structural modifications (< 500 mu m particle size) enhanced enzymatic accessibility, exhibiting superior functionality of fermented cottonseed meal (FCSM): 35.5 g/100 g soluble protein (6.8-fold improvement), 89.9 % protein digestibility (3.4-fold enhancement), and complete gossypol detoxification post-digestion. Bioactive peptides demonstrated antioxidant activity (DPPH EC50 = 1.59 g/L, ABTS EC50 = 0.44 g/L) correlating with 30.6 % oligopeptides (100-500 Da) containing redox-active motifs. Nutritional profiling revealed 41.6 % essential amino acids, meeting FAO/WHO standards. In largemouth bass trials, FCSM enhanced feed palatability while maintaining growth performance as fish meal alternative. This study presents a sustainable solution to address the challenges of global food and feed security by transforming CSM into high-value protein.

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