Determination of simple sugars and acidity on husk tomato collects (Physalis ixocarpa Brot.)

Abstract

In this study, 60 genotypes of husk tomato collected in several places of the Mexican Republic were grouped according to sugar content and acidity, a parameters that let us find differences among groups. The study was established in the Experimental Field of the Universidad Autonoma Chapingo, during the spring-summer cycle of 1991. The analyses were made using the Lane y Eynon volumetric method for determining sugar content and a simple titration method, with sodium hydroxide 0.1 N, for the sugars determination and simple titration method, with sodium hydroxide 0.1 N, for determining acidity. The results show that for totals and direct reduction sugar content, only two groups, with respect to the sweetest material were differenciated, the second group consisting of fewer than 15 % of the total of genotypes in both variables, not so for the variable acidity. No relationship between the variables and the origin the collected genotypes (wild and cultivated) was found; this means that such characteristics, have been not used yet by growers as a selection criterion. Nor was an evident relationship between sugars degree and acidity detected.