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4736209 
Journal Article 
Effect of moisture content on oil extraction from spent coffee grounds 
Mabona, N; Aboyade, W; Mollagee, M; Mguni, LL 
2018 
Yes 
Energy Sources. Part A. Recovery, Utilization, and Environmental Effects
ISSN: 1556-7036
EISSN: 1556-7230 
40 
5 
501-509 
WOS:000427843800005 
Spent coffee grounds (SCG) were used in this study for oil extraction. It was observed that oil extraction increased with water content up to 20 wt% for non-polar solvents and up to 40 wt% for polar solvents. At 80 wt% moisture, no oil was observed instead a black gel was formed. Oil extraction was observed to increase with time but it was concluded that increasing extraction time beyond 60 min had no significant benefit for both solvents (ethanol and toluene). The highest amount of oil extracted was observed when using ethanol at 40 wt% moisture and it was around 20%. The saponification values for oil extracted from SCG were observed to be between 175 and 180 but were lower than those obtained for soybean (193). The SCG oil was observed to contain the following fatty acids in this quantity order: palmitic> linoleic acid > stearic acid. 
Spent coffee grounds; oil extraction; solvents; fatty acids