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A preliminary study on l-lysine fermentation from lignocellulose feedstock and techno-economic evaluation

Chen, Zeyu, Liu, Gang, Zhang, Jian, Bao, Jie
Bioresource technology 2019 v.271 pp. 196-201
Corynebacterium glutamicum, corn stover, cost effectiveness, enzymatic hydrolysis, feedstocks, fermentation, lignocellulose, lysine, prices, starch
l-Lysine is a commodity amino acid produced from starch feedstock. Various alternative feedstocks had been used for l-lysine production, but the yield was very low. This study took the first preliminary investigation on l-lysine production from lignocellulose for the replacement of food-crop starch. Corn stover was dry acid pretreated and biodetoxified, then used for enzymatic hydrolysis and l-lysine fermentation by an industrial Corynebacterium glutamicum strain. Various fermentation parameters, nutrient additions, and operation variables were applied and finally 33.8 g/L of l-lysine was obtained. This l-lysine titer is still below that of starch based fermentation, but already 3–5 folds greater than that of other alternative feedstocks based fermentation. A techno-economic analysis was conducted and the minimum selling price of l-lysine (hydrochloride form) was calculated to be $2.445 per kg. The cost reduction by the future improvement could fill the technical and economic gap between the cellulosic and starch based l-lysine production.