| Title | Bioprocessing of agro-industrial residues into lactic acid and probiotic enriched livestock feed |
|---|---|
| ID_Doc | 12248 |
| Authors | Mladenovic, D; Djukic-Vukovic, A; Stankovic, M; Milasinovic-Seremesic, M; Radosavljevic, M; Pejin, J; Mojovic, L |
| Title | Bioprocessing of agro-industrial residues into lactic acid and probiotic enriched livestock feed |
| Year | 2019 |
| Published | Journal Of The Science Of Food And Agriculture, 99.0, 12 |
| Abstract | BACKGROUND Growing challenges of resource depletion, food security and environmental protection are putting stress on the development of biorefinery processes for bioprocessing of residues from food and agro-industry into value-added products. In this study, the simultaneous production of lactic acid (LA) and livestock feed on a combined substrate based on molasses and potato stillage by Lactobacillus paracasei NRRL B-4564 immobilized onto sunflower seed hull (SSH), brewer's spent grain (BSG) and sugar beet pulp (SBP) was studied. RESULTS The highest total LA concentration of 399 g L-1 with overall productivity of 1.27 g L-1 h(-1) was achieved in repeated batch fermentation by SBP-immobilized biocatalyst, followed by BSG- and SSH-immobilized cells. Fermentation improved the content of proteins and ash, and decreased the content of fibers in all three support materials. In addition, the fermentation had favorable effect on in vitro dry matter digestibility and energy values of SSH and BSG. According to assessment of probiotic potential, L. paracasei demonstrated a favorable probiotic profile, exhibiting high resistance to simulated ruminant digestive tract and significant antioxidant and antimicrobial activity. CONCLUSIONS The proposed strategy enables valorization of agro-industrial residues as value-added ruminant feed and simultaneous LA production. Following principles of circular economy, the developed process combines different raw materials and integrates them into a biorefinery process, improving the overall profitability and productivity. (c) 2019 Society of Chemical Industry |
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