Microparticle-enhanced lignocellulolytic enzyme production using DDGS as the main fermentation feedstock

Attia Iram, Deniz Cekmecelioglu, Ali Demirci

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Distillers dried grains with solubles (DDGS) is a byproduct of corn ethanol production which has shown to be an efficient microbial medium for cellulase and xylanase production. These hydrolytic enzymes are crucial in production of lignocellulosic biofuels. Therefore, different strategies to increase the production and quality of such enzymes should be explored. In this study, the effect of microparticles on the enzyme production levels was analyzed using acid hydrolyzed DDGS as the base media. The microparticles, i.e. aluminum oxide and magnesium silicate (talc) were assessed on different days of fungal fermentation at 250 ml shake flask level and 2 L bioreactor level. It was determined that the addition of 5 g/L of aluminum oxide can increase cellulase production from 0.52±0.02 to 1.15±0.04 IU/ml on day 9 in a shake flask. The addition of 10 g/L of aluminum oxide increased the cellulase production from 0.77±0.05 to 0.93±0.01 IU/ml on day 9 in the bioreactor. The xylanase production levels also increased on day 3 from 11.65±0.1 to 21.73±1.98 IU/ml with aluminum oxide particles. The microscopic study of the fungal broth showed a positive change in the mycelial morphology such as a decrease in the dense branching of A. niger mycelia with increasing concentration of microparticles. In addition, it was also concluded that aluminum oxide is a better microparticle than talc in terms of enzyme production levels (121% higher in case of cellulase and 86% for xylanase). Future studies should focus on the optimization of microparticles concentration for enzyme production along with scale-up studies.

Original languageEnglish (US)
Title of host publication2023 ASABE Annual International Meeting
PublisherAmerican Society of Agricultural and Biological Engineers
ISBN (Electronic)9781713885887
DOIs
StatePublished - 2023
Event2023 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2023 - Omaha, United States
Duration: Jul 9 2023Jul 12 2023

Publication series

Name2023 ASABE Annual International Meeting

Conference

Conference2023 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2023
Country/TerritoryUnited States
CityOmaha
Period7/9/237/12/23

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Bioengineering

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