Application of IAspergillus niger/I in Practical Biotechnology of Industrial Recovery of Potato Starch By-Products and Its Flocculation Characteristics

• Published in: Microorganisms (Basel) Vol. 10; no. 9
• Main Authors: Zhang, Liang, Cao, Guangli, Liu, He, Wu, Zhenting, Gong, Dianliang, Ru, Xin, Gong, Xiujie, Pi, Qiuyue, Yang, Qian
• Format: Journal Article
• Language: English
• Published: MDPI AG 01-09-2022
• Subjects: Aspergillus; Chemical properties; Extraction (Chemistry); Industrial microorganisms; Methods; Potatoes; Starch; China
• ISSN: 2076-2607; 2076-2607
• DOI: 10.3390/microorganisms10091847

This study developed a practical recovery for potato starch by-products by A. niger and applied it on a plant scale to completely solve the pollution problems. Soughing to evaluate the effect of A. niger applied towards the production of by-products recycling and analyze the composition and characteristics of flocculating substances (FS) by A. niger and advance a possible flocculation mechanism for by-product conversion. After fermentation, the chemical oxygen demand (COD) removal rate, and the conversion rates of cellulose, hemicellulose, pectin, and proteins were 58.85%, 40.19%, 53.29%, 50.14%, and 37.09%, respectively. FS was predominantly composed of proteins (45.55%, w/w) and polysaccharides (28.07%, w/w), with two molecular weight distributions of 7.3792 × 10[sup.6] Da and 1.7741 × 10[sup.6] Da and temperature sensitivity. Flocculation was mainly through bridging and ionic bonding, furthermore, sweeping effects may occur during sediment. Flocculation was related to by-products conversion. However, due to severe pollution problems and resource waste, and deficiencies of existing recovery technologies, converting potato starch by-products via A. niger liquid fermentation merits significant consideration.