Qualities of arabica and robusta cascara kombucha with different concentrations of starter

Abstract

Coffee waste consisted of coffee peel (45%), mucilage (10%) and seed peel (5%). Generally, coffee peel is used in the manufacture of fertilizers. Coffee peel waste is a potential material that can be the producer of caffeine, polyphenol, bioethanol, antioxidantand antimicrobial. Coffee peel has many benefits including ward off free radicals, protect the stomach and give a firming effect on skin. This research aimed to create functional drink with high antioxidant activity by optimizing arabica and robusta coffee peel waste. This research used Completely Randomized Factorial Design with two treatment factors namely type of cascara (arabica and robusta) and starter concentration variation (5%, 10% and 15%). The treatment repeated three times. The parameters observed were total polyphenol, total titrated acid, total dissolved solid, pH and total mesophilic aerobic bacteria. The results showed that coffee peeltype, starter concentration variation and the interaction between two factors had significant effects on total titrated acid and total dissolved solid cascara kombucha. Cascara kombucha with robusta coffee peel and starter concentration at 10% was chosen as the best treatment with total phenol 93.18 μg/ mL, TTA 0.82%, TDS 3.80°Brix, pH 4.21, and TMAB 7,7 log CFU/mL. Key words: Coffee peel; Fermentation; Functional drink; Starter.