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Thermophilic biocatalysts for one-step conversion of citrus waste into lactic acid

Journal Article · · Applied Microbiology and Biotechnology
 [1];  [2];  [3];  [4];  [4];  [4];  [3];  [3];  [5];  [5];  [2];  [2];  [6]
  1. Univ. of Naples Federico II (Italy); National Research Council (CNR) (Italy); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  2. University of Campania L. Vanvitelli, Naples (Italy)
  3. Univ. of Naples Federico II (Italy)
  4. National Research Council (CNR) (Italy)
  5. University of Salerno (Italy)
  6. Univ. of Naples Federico II (Italy); National Biodiversity Future Center (NBFC) (Italy)
Agri-food residues offer significant potential as a raw material for the production of L-lactic acid through microbial fermentation. Weizmannia coagulans, previously known as Bacillus coagulans, is a spore-forming, lactic acid-producing, gram-positive, with known probiotic and prebiotic properties. This study aimed to evaluate the feasibility of utilizing untreated citrus waste as a sustainable feedstock for the production of L-lactic acid in a one-step process, by using the strain W. coagulans MA-13. By employing a thermophilic enzymatic cocktail (Cellic CTec2) in conjunction with the hydrolytic capabilities of MA-13, biomass degradation was enhanced by up to 62%. Moreover, batch and fed-batch fermentation experiments demonstrated the complete fermentation of glucose into L-lactic acid, achieving a concentration of up to 44.8 g/L. These results point to MA-13 as a microbial cell factory for one-step production of L-lactic acid, by combining cost-effective saccharification with MA-13 fermentative performance, on agri-food wastes. Moreover, the potential of this approach for sustainable valorization of agricultural waste streams is successfully proven.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2470649
Journal Information:
Applied Microbiology and Biotechnology, Journal Name: Applied Microbiology and Biotechnology Journal Issue: 1 Vol. 108; ISSN 0175-7598
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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