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Evaluation of onion waste as a substrate in submerged fermentation for the production of bioactive compounds - RIIIT
Evaluation of onion waste as a substrate in submerged fermentation for the production of bioactive compounds
The development of new technologies for the use of agroindustrial waste, implies their use as supports or substrates for the production of bioactive compounds through submerged fermentation (SmF), using microorganisms that have the ability to degrade the cell walls of vegetables. The objective of the study was to use onion waste as a substrate by Aspergillus niger for the production of an extract rich in bioactive compounds using SmF. Evaluations of the fermented extract were performed in triplicate every 24 h during 240 h, to evaluate the process kinetics of bioactive compounds production; data were statistically analyzed by analysis of variance, and the tests for comparison of means were evaluated with the Tukey test (p ≤ 0.05). The obtained results showed the capacity of Aspergillus niger to use the onion waste as carbon source, reaching a maximum growth of 60.9 mg glucosamine (GcA)/g dry sample at 144 hours. The growth of the microorganism allowed the production of secondary metabolites, such as Hydrolysable phenols (THP), with a maximum concentration of 14.4 mg Gallic Acid Equivalents (GAE)/g dry sample at 120 h, and Flavonoids, with a maximum concentration of 4.1 mg Quercetin equivalents (QE)/ g dry sample in 240 h, having an Antioxidant Capacity of 51.4 mM Trolox Equivalent (TE)/g dry sample at time of 240 hours. It was demonstrated that the use of onion residues as substrate by SmF allows obtaining a better concentration of bioactive compounds of high interest.
Key Words: Agroindustrial waste, Aspergillus niger, bioactive compounds, submerged fermentation.
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