Effect of microwave drying pretreatment prior to soxhlet extraction of coffee oil

Abstract

To increase the effectiveness of the coffee oil processing process in drying coffee beans, in this study, pretreatment drying using a microwave was evaluated. The drying method using a microwave was carried out with three power inputs. After the drying process, it was followed by roasting and grinding process of the coffee beans. Then the coffee beans were extracted so that the oil was obtained. From the process of drying coffee beans using a microwave with 3 variations of input power, namely MH, MM, and ML, from the initial moisture content of 56.75%, the moisture content was 7.29% in a row; 8.32%; and 10.32%. Meanwhile, from the results of the extraction of coffee beans in the three variations of the drying process, the yield of coffee oil was 16.936%, 16.448%, and 2.534%, respectively. It can be seen that the input power in the microwave drying process greatly affects the results of decreasing the moisture content of coffee beans and the yield of coffee oil. In addition, from the process that has been carried out, it can be seen that the fatty acid content obtained in coffee oil was high. So that the drying process carried out using a microwave is very effective to do in producing coffee oil with high yields.