Journal
BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS
Volume 15, Issue 1, Pages -Publisher
BMC
DOI: 10.1186/s13068-021-02095-6
Keywords
Paper mulberry; Autohydrolysis; Xylooligosaccharide; Amino acids; Single-cell protein
Funding
- National Key Research and Development Program of China [2019YFB1503803]
- State Key Laboratory of Pulp and Paper Engineering [202115]
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This study proposes a novel process to coproduce amino acid-rich XOS and SCP from paper mulberry through autohydrolysis. The carbohydrate of paper mulberry is effectively converted to high value-added products.
BackgroundAutohydrolysis is an extensively investigated pretreatment method due to its environmental friendliness. During autohydrolysis, most xylan from hemicellulose can be converted into xylooligosaccharides (XOS), and cellulose in the autohydrolyzed residues can be transformed into glucose after enzymatic hydrolysis. Both of these are value-added biochemicals in the biorefining process. In this work, paper mulberry (PM), which contains abundant protein, was utilized as a raw material to coproduce XOS and single-cell protein (SCP) through autohydrolysis and fermentation technologies.ResultsThe results showed that 8.3 g of XOS and 1.8 g of amino acids could be recovered in the autohydrolysate (based on 100 g raw material) after autohydrolysis (170 degrees C, 1 h). Moreover, 5.7 g of low-DP XOS along with 1.8 g of amino acids could be further obtained from the autohydrolysate after hydrolysis with endo-beta -1-4-xylanase. In addition, 20.1 g of fermentable monosaccharides was recovered after hydrolyzing the autohydrolyzed PM with cellulase, which can be used to produce 4.8 g of SCP after fermentation with Candida utilis.ConclusionAs a valuable application of PM, a novel process is proposed to coproduce amino acid-rich XOS and SCP through autohydrolysis. The carbohydrate of PM is effectively converted to high value-added products.
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