Effect of Pretreatment Spent Coffee Ground with Natural Deep Eutectic Solvent (NADES) on Coffee Oil Yield

Abstract

Abstract This study aims to identify spent coffee ground pretreatment with NADES solvent effect on coffee oil yield. The types of NADES used are choline chloride: urea, choline chloride:fructose, and choline chloride:glucose. Spent coffee grounds were pretreated and extracted using Ultrasound-Assisted Extraction (UAE) method. Pretreatment at 1:10 (g/g) SCG:NADES ratio, 6 minutes on 55°C temperature. Then pretreated spent coffee grounds are extracted with n-hexane and separated solvent from coffee oil from pretreatment coffee oil are palmitic acid (46,75%), linoleic acid (48,07%), and stearic acid (1,66%)using a rotary evaporator. Pretreatment coffee oil yields are 17,6%, meanwhile the non-pretreatment yields only 13,53%. Fatty acid in coffee oil was identified using FTIR and GC-MS. The fatty acid compounds