Abstract
The waste generated by cassava starch processing has an ample variety of molecules that can be converted to value-added products. Cassava starch wastewater (CSW) has a high nutritional value and can be used as a substrate in biological processes, in addition to providing microorganisms of biotechnological interest, due to the rich native biota present. Bacteriocins—peptides synthesized by ribosomes—are capable of inactivating or inhibiting the growth of pathogenic bacteria, used to preserve food, and can be isolated from CSW. This study evaluated growth conditions to produce bacteriocins from a lactic acid bacterium Leuconostoc mesenteroides isolated from CSW, using residues from the cassava processing agroindustry as substrate. The experimental planning by Plackett & Burman (PB) was carried out to evaluate the effects of the variable's sucrose, yeast extract, potassium phosphate, magnesium sulfate, and Tween 80, with 15 assays, 36 h of incubation, and agitation at 100 rpm. From these assays, it was verified that only the variables sucrose, yeast extract, and tween 80 were significant at 90%. The results indicated a maximum bacteriocin production of 1990.47 AU/mL (assay 14), COD (chemical oxygen demand) removal efficiency of 59.99% (assay 11), the sugar removal efficiency of 55.89 (assay 14), and production of lactic acid 21.41 g/L (assay 6).
Get full access to this article
View all access options for this article.
