Antioxidant activity and physicochemical composition of coffee pulp obtained from three coffee varieties in Aceh, Indonesia

Abstract

This study aims to analyze the antioxidant activity and physicochemical composition of coffee pulp from the three coffee varieties in Aceh Province. This research is exploratory. The pulp of arabica, robusta, and liberica coffee was sun-dried to produce cascara. The properties of cascara including antioxidants, total soluble solids, total titratable acidity, pH, moisture content, ash content, fat content, protein content, crude fiber, and total phenol were evaluated. The results showed that the pulp of arabica, robusta, and liberica coffee could reduce free radicals using the DPPH method with a very strong intensity, where the IC50 produced was ranged 33.95 to 44.94 ppm (very strong category ≤ 50 ppm). The results of the physicochemical analysis included for total soluble solids (TSS) at 0.83 - 16.00°Brix; total titratable acidity 0.001- 0.160%; pH 4.68 - 5.59; moisture content 67.61-79.49%; ash content 1.39 - 3.74%; fat content 0.3 - 1.01%; protein content 4.08 - 7.88%; crude fiber content 13.79 - 38.51% and total phenol 21.99 - 80.00 mg GAE/100g sample. These results can be the basis for diversifying the utilization of coffee pulp waste into useful products such as functional drinks like cascara and kombucha.