Enhancement of lactic acid production by utilizing Liquid Potato Wastes

Abstract

A viable process based on a low cost production media is desired to enhance the economics of fermentative production of 1-lactic acid. Attempts were made to exploit Liquid Potato Wastes (LPW) excluded in the potato processing industry (chips), as a substrate for lactic acid production. Aiming at maximum lactic acid productivity, the screening of strains, components of media and cultivation conditions were varied. The production of a notable and highly effective lactic acid, by the most efficient strain Lactobacillus casei EMCC 11093, utilizing the abundant Liquid Potato Wastes (LPW) was achieved in 4-day cultures, at temperature and pH of 32°C and 3.5, respectively. The LPW with MRS medium (with absence of peptone, yeast extract and glucose, and presence of malt extract, galactose and manganes sulphate) represented the most preferable nutritional conditions for obtaining maximum production of lactic acid (16.09 g L-1). © 2011 Academic Journals Inc.