Recovery of glucose from dried distiller's grain with solubles, using combinations of solid-state fermentation and insect culture

Canadian Journal of Microbiology
Timothy Howdeshell, Takuji Tanaka

Abstract

A bioethanol by-product, dried distiller's grains with solubles (DDGS) contains high levels of cellulose and starch. We hypothesized that combinations of solid-state fermentation (SSF) and digestion by black soldier fly larvae (BSFL) (Hermetia illucens) could increase the recovery of glucose from this by-product by concentrating and loosening the cellulose matrix through their activities. DDGS was individually fermented with Aspergillus niger, Aspergillus fumigatus, Trichoderma koningii, Phanerochaete chrysosporium, or Lactobacillus plantarum. The fermented DDGS was fed to BSFL, and glucose recoveries from spent feeds were conducted. SSF increases lipid and protein contents, supporting BSFL growth, and weakens the cellulosic matrix. BSFL use nutrients in SSF-DDGS, further concentrating and weakening the cellulose, i.e., DDGS is halved without changing the cellulose contents. For example, Lactobacillus plantarum SSF with BSFL culture concentrates the cellulose content from 9.7% to 26.5% of spent feed. Glucose recovery was determined using three sequential processes (free glucose determination, weak-acid hydrolysis of amorphous cellulose, and enzymatic hydrolysis of micronized crystalline cellulose). Total glucose obtained from 1...Continue Reading

References

Jun 13, 2002·Bioresource Technology·Ye Sun, Jiayang Cheng
Jul 30, 2002·Journal of Medical Entomology·D Craig SheppardSonya M Sumner
Aug 13, 2002·Applied Microbiology and Biotechnology·E SchusterP W M Van Dijck
Sep 24, 2008·Applied Microbiology and Biotechnology·Deepak Singh, Shulin Chen
Sep 24, 2009·Bioresource Technology·H Noureddini, J Byun

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