Study on the wine brewing technology of coffee pulp grown in Yunnan province

Coffee pulp was used as material.Orthogonal test and response surface as an approach were to optimize the conditions of pretreatment and fermentation process.The results showed that: the optimum pretreatment conditions were as follows: additive amount of cellulase as 1%, enzymolysis temperature of 35 ℃, hydrolysis time of 3 h, and the content of soluble solids change the most of 1.7%.The optimized fermentation conditions were as follows: inoculums size of yeast 7.5%, the sugar degree of fermentation 22%, fermentation temperature 29 ℃, and the fermentation time for 7 d as well as the alcohol content about10.8%.The coffee pulp fruit wine possessed amber, rich coffee flavor and clarity.The content of caffeine was 34.3 mg/L.