María Soledad Toledo1, Pía Armijo2, Liliana Godoy2,
Jorge Saavedra3 and M. Angélica Ganga2*
1Departamento de Biotecnología. Universidad Tecnológica Metropolitana. Las Palmeras 3360, Ñuñoa, Santiago, Chile.
2 Departamento de Ciencia y Tecnología de los Alimentos, Universidad de Santiago de Chile (USACH), Avda. Alameda 3363. Estación Central, Santiago, Chile.
3Escuela de Ingeniería de Alimentos, DATAChem AgroFood group, Waddington 716, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
After alcoholic fermentation, Oenococcus oeni is the protagonist that carry out malolactic fermentation in order to improve the quality of wine. However, the effectiveness of malolactic fermentation varies according to intraspecific diversity of O. oeni at a genetic level and physicochemical concentrations of intrinsic factors. In this study, we assessed both components by isolating O. oeni from three Chilean vineyards (Maipo, Colchagua y Curicó) and measuring intrinsic components, such as biogenic amines and amino acids, during malolactic fermentation. Both data were condensed and then processed with Multivariate using the statistical method of correspondence analysis. The genetic data was clustered using the RAPD-PCR molecular method, and the physicochemical analysis was carried out using chromatography techniques. Isolation of O. oeni species and genetic diversity results between the vineyards revealed that O. oeni strains cluster according to its geographical origin, with strains similarity higher than 60% of all the samples. The wines of each valley could be characterized by the presence or absence of biogenic amines, and final correspondence analysis showed that there is a differentiation of strains between the studied Valleys, also confirming the accomplishment of the malolactic fermentation in the wines analyzed.
Keywords: Genotyping, Lactic acid bacteria, Oenococcus, Wine, Fermentation.