Estimate of the carbohydrate fractions of the coffee hulls and dehydrated pulp of coffee (Coffea arabica L.) stored for different period

The coffee hull and pulp dehydrated carbohydrate fractions A, B-1, B-2 and C, were evaluated according to the CNCPS. Three coffee cultivars were evaluated: Catuaf, Rubi and Mundo Novo. Pulp was obtained by moist pulping in a mechanical pulper and dried in the sun adjusted to 13% moisture. Materials were stored in raffia bags in environment free of moisture and well ventilated. Samplings were taken every 90 days. The equations utilized for determining fractions were reported in the CNCPS model. There was an increase in the fraction A and B-1 content and reductions in fractions B-2 and C as the storage time increased. The Catuai cultivar presented a higher fraction A value, compared to Rubi and Mundo Novo. Fraction B-1 was greater in the cultivars Catuaf and Rubi compared to Mundo Novo. The cultivar Mundo Novo presented higher value for fraction B-2 compared to the cultivars Catuai and Rubi. No significant differences were found among the cultivars for fraction C. Coffee hull presented higher values for fractions A and B-1 and lower for fraction B-2 compared to dehydrated pulp, whilst fraction C was greater in the pulp as compared with coffee hull. The storage for 12 months changed the ratio of the carbohydrates, reducing the slow degradability and undegradable fractions and increasing the fast degradability fractions. Pulping process reduces sugars and pectin. Hull and pulp are materials with a high ratio of unavailable carbohydrates, which may limit its use in great amounts for ruminants.