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. 2021 Sep;44(9):1965-1974.
doi: 10.1007/s00449-021-02578-8. Epub 2021 May 8.

Coproduction of polymalic acid and liamocins from two waste by-products from the xylitol and gluconate industries by Aureobasidium pullulans

Tianfu Li  1 , Wenwen Yang  1 , Xingran Xu  1 , Yan Zhang  2 , Jie Chen  3 , Xiang Zou  4
Affiliations

Coproduction of polymalic acid and liamocins from two waste by-products from the xylitol and gluconate industries by Aureobasidium pullulans

Tianfu Li et al. Bioprocess Biosyst Eng. 2021 Sep.

Abstract

The coproduction of polymalic acid (PMA) and liamocins, two important metabolites secreted by Aureobasidium pullulans, from two waste by-products from the xylitol and gluconate industries was investigated in shake flasks and fermentors, confirming that waste xylose mother liquor (WXML) could be utilized as an economical feedstock without any pretreatment. Gluconate could strengthen carbon flux and NADPH supply for the synergetic biosynthesis of PMA and liamocins. High PMA and liamocin titers of 82.9 ± 2.1 and 28.3 ± 2.7 g/L, respectively, were obtained from the coupled WXML and waste gluconate mother liquor (WGML) in batch fermentation, with yields of 0.84 and 0.25 g/g, respectively. These results are comparable to those obtained from renewable feedstocks. Economic assessment of the process revealed that PMA and liamocins could be coproduced from two by-products at costs of $1.48/kg or $0.67/kg (with liamocins credit), offering an economic and sustainable process for the application of waste by-products.

Keywords: Aureobasidium pullulans; Liamocins; Polymalic acid; Waste gluconate mother liquor; Waste xylose mother liquor.

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