Composição química de grãos crus de cultivares de Coffea arabica L. suscetíveis e resistentes à Hemileia vastatrix Berg et Br

Abstract

The aim of this article is characterizing the chemical and physical chemical composition of raw grains and analyzing new resistent material to rust (Hemilea vastatrix Berg. et Br.) compared to the traditional ones. The fruits were originated from breeding experiments from MAPA/PROCAFÉ, localized in the experimental farm of Varginha , Minas Gerais state. They were harvested and taken to the Postharvest Technology Center of Universidade Federal de Lavras, where they were washed, peeled and dried in a concrete ground. After cleaning, the grains were packed in aluminun box and stored at 15ºC. The utilized fruits cultivars were: 'Acaiá', 'Acauã', 'Bourbon Amarelo', 'Canário', 'Catuaí Amarelo', 'Catuaí Vermelho', 'Catucaí Amarelo', 'Catucaí Vermelho', 'Icatu Amarelo', 'Icatu Vermelho', 'Mundo Novo', 'Palma', 'Rubi', 'Sabiá 398', 'Siriema' e 'Topázio', from 2002 harvest. The raw beans were tritured in a ball mills with liquid N2 . The accomplished analyses were: total sugars, reducers and non reducers, ethereal extract, polyphenols and caffeine. Differences were considered as significants and the cultivars showed variations related to tenors of all the evalued compositions, indicating to have influences of genotypo on these constituents.