Biomass and volatile metabolites production of industrial interess from vinasse by yeasts

Abstract

Brazil and Mexico have typical and world-known distilled drinks, cachaça and tequila. The production of these distillates is similar and both generate a liquid residue, known as vinasse. This residue presents high polluting degree and needs alternatives for its use. Proposals of direct use and treatment of vinasse are known, but inefficient and applicable in the long run. It is in this context, the use of vinasse could be the viable alternative for the economy and the environment. Yeasts from different substrates from Brazil and Mexico were tested for their ability to produce biomass and volatile compounds of industrial interest from this residue. Statistical models were used to evaluate different cultivation conditions in the optimization of biomass production. The biomass generated was evaluated by dry weight. Analyzes of nutritional and anti-nutritional factors were performed Yeasts showed best performance were used in the evaluation for the production of volatile compounds using tequila and cachaça vinasse. Composition and quantification of the volatile compounds were carried out by HS-GC-FID (Headspace in Gas Chromatography coupled to the Flame Ionization Detector). The results indicated that the use of vinasse can be an economically viable way for production of single cell protein and volatile compounds, along with the reduction of pollutant parameters. The main volatile compound detected was 2-phenylethanol. So, yeasts growth, when conditions are adjusted, can be a promising alternative in the production of high added value products.