Sugar beet processing waste as a substrate for yeast protein production for livestock feed

Abstract

This study investigated the optimal yeast strains for producing single cell protein based on waste sugar beet pulp (SBP) under various biomass loads. All tested strains were capable of growing on the waste biomass. Candida utilis and Saccharomyces cerevisiae Ethanol Red produced the greatest increase in protein on fresh SBP (ΔN 1.84%). Scheffersomyces stipitis (ΔN 2.27%) provided the highest increase on dried SBP. All tested strains showed significant assimilation of nitrogenous compounds. Based on the crude fiber content after fermentation, the largest reduction in fiber occurred with Candida utilis R6 (10.5%) on fresh SBP, and Yarrowia lipolytica (13.1%) on dried SBP. These results demonstrate the potential of SBP as a substrate for the production of single cell protein and highlight the importance of selecting the appropriate strains to optimize the process.