냉동보관된 커피박은 추출 실험에 앞서 60도 오븐에서 건조 무게의 변화가 없을 때까지 건조하여 실험에 사용하였다.
The coffee grounds stored in the freezer were dried in an oven at 60 degrees until there was no change in dry weight prior to the extraction experiment and used for the experiment.