Fermentative utilization of coffee mucilage using Bacillus coagulans and investigation of down-stream processing of fermentation broth for optically pure l(+)-lactic acid production.

Abstract:

:In this study, mucilage, a residue from coffee production, was investigated as substrate in fermentative l(+)-lactic acid production. Mucilage was provided as liquid suspension consisting glucose, galactose, fructose, xylose and sucrose as free sugars (up to 60gL(-1)), and used directly as medium in Bacillus coagulans batch fermentations carried out at 2 and 50L scales. Using mucilage and 5gL(-1) yeast extract as additional nitrogen source, more than 40gL(-1) lactic acid was obtained. Productivity and yield were 4-5gL(-1)h(-1) and 0.70-0.77g lactic acid per g of free sugars, respectively, irrespective the scale. Similar yield was found when no yeast extract was supplied, the productivity, however, was 1.5gL(-1)h(-1). Down-stream processing of culture broth, including filtration, electrodialysis, ion exchange chromatography and distillation, resulted in a pure lactic acid formulation containing 930gL(-1)l(+)-lactic acid. Optical purity was 99.8%.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Neu AK,Pleissner D,Mehlmann K,Schneider R,Puerta-Quintero GI,Venus J

doi

10.1016/j.biortech.2016.03.122

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

398-405

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(16)30425-4

journal_volume

211

pub_type

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