Next Article in Journal
Enhanced Production and Quantitative Evaluation of Nigericin from the Algerian Soil-Living Streptomyces youssoufiensis SF10 Strain
Next Article in Special Issue
Influence of Media Heat Sterilization Process on Growth Performance of Representative Strains of the Genus Lactobacillus
Previous Article in Journal
Improved Raoultella planticola Strains for the Production of 2,3-Butanediol from Glycerol
Open AccessArticle

Impact of Hydrolysis Methods on the Utilization of Agricultural Residues as Nutrient Source for D-lactic Acid Production by Sporolactobacillus inulinus

Thünen-Institute of Agricultural Technology, Bundesallee 47, 38116 Braunschweig, Germany
*
Author to whom correspondence should be addressed.
Fermentation 2019, 5(1), 12; https://doi.org/10.3390/fermentation5010012
Received: 14 December 2018 / Revised: 21 January 2019 / Accepted: 22 January 2019 / Published: 23 January 2019
(This article belongs to the Special Issue Lactic Acid Fermentation and the Colours of Biotechnology)
d-lactic acid is a building block for heat resistant polylactic acid, a biobased polymer with a high potential. Nevertheless, an economically efficient industrial process for d-lactic acid production still needs to be implemented. Yeast extract is an expensive nutrient source, which is used to fulfill the complex nutritional requirements in lactic acid fermentations. The substitution of yeast extract by cheap alternative nutrient sources is a challenge in many fermentation processes. In this study, chemical and enzymatic hydrolysis techniques for protein rich agricultural residues and their effectiveness are compared, as well as their impact on the d-lactic acid production of Sporolactobacillus inulinus. An efficient substitution of yeast extract could be achieved by a variety of agricultural residues, hydrolysed with 3M H2SO4, demonstrating the much higher versatility and effectiveness of this method compared to enzymatic methods. In a fed-batch experiment with chemically hydrolyzed rapeseed meal and minimal supplementation, a lactic acid titer of 221 g L−1 and an overall productivity of 1.55 g (L h)−1 (96% yield) were obtained. View Full-Text
Keywords: Sporolactobacillus inulinus; d-lactic acid; nutrient sources; agricultural residues; chemical hydrolysis; enzymatic hydrolysis Sporolactobacillus inulinus; d-lactic acid; nutrient sources; agricultural residues; chemical hydrolysis; enzymatic hydrolysis
Show Figures

Figure 1

MDPI and ACS Style

Brock, S.; Kuenz, A.; Prüße, U. Impact of Hydrolysis Methods on the Utilization of Agricultural Residues as Nutrient Source for D-lactic Acid Production by Sporolactobacillus inulinus. Fermentation 2019, 5, 12.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop