Utilizing Coffee Ground Waste In Making Liquid Soap Scrub
Keywords:
coffee grounds, liquid soap, crubAbstract
The increase in national coffee consumption has an impact on the accumulation of coffee grounds waste (Spent Coffee Grounds) which is at risk of polluting the environment if not managed properly. This study examines the use of coffee grounds waste as a natural scrub ingredient in liquid soap formulations to provide safe exfoliation functions for the skin. The purpose of the study was to determine the optimal concentration of coffee grounds on the physical-chemical characteristics of liquid soap according to SNI 4085:2017 standards. The research method was carried out through laboratory experiments by varying the concentration of coffee grounds (0%, 3%, 6%, 9%, and 12% w/w) and Sodium Laureth Sulfate (SLS) as a surfactant (5%, 10%, 15%, 20%, and 25% w/w). Coffee grounds were processed through drying at 60°C and sieving with a size of 120 mesh before being added to the soap base. Test parameters included pH value, viscosity, foam stability, homogeneity, free fatty acids, free alkalis, as well as organoleptic and irritation tests on panelists. The results showed that the addition of coffee grounds significantly increased the soap viscosity to 12,890 cP at the highest concentration and increased foam stability by up to 95%. All formulations had a pH range of 4.3–5.7, which is compatible with the skin's acid mantle, making them safe to use. Panelist test data confirmed that coffee grounds concentrations of 9% and 12% with SLS levels above 15% produced liquid soap with excellent cleaning power, a comfortable scrub texture, and did not cause skin irritation. In conclusion, coffee grounds waste is effective for use as a scrubbing agent in liquid soap with physical characteristics that meet industrial quality standards and provide economic added value to organic waste.
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