Estimated regression models between color and the physicochemical properties of aguaymanto (Physalis peruviana L.)

Abstract

The objective of this research was to determine the relationship between the physicochemical and color aguaymanto properties in the 4 stages of maturity (green, ripening fruit, ripe and overripe) through regression analysis. Color components as independent variables (L *, a *, b *, C * h) is considered as the physicochemical properties as the dependent variables (pH, ° Brix, and Maturity Index Acidity), 20 units was performed Aguaymanto for each maturity stage. A colorimeter was used to determine the coordinates L *, a * and b * from which was calculated as C * h IRAM 20022: 2000, for the potentiometric pH AOAC method; 981.12, soluble solids AOAC refractometry; 932.12, titratable acidity (titrimetry AOAC 942.15) and to identify the state of maturity Colombian Technical Standard NTC 4580 was used. From the results it is concluded that there exists a positive relationship between these variables and models that have better predictive indicators (R > 0.7 and lower σ) are those including L *, a * and b * being the parameter to * the aj greatest influence on the physicochemical properties (pH, ° Brix, acidity and maturity Index) at different stages of maturity; because it relates directly to the exterior color of the fruit by increasing carotenoids in the maturation process.