Validasi Metode dan Penetapan Kadar Kafein Menggunakan Spektrofotometri UV-Vis

Abstract

Caffeine is one of the alkaloids contained in coffee. Caffeine in coffee has clinically useful pharmacological effects, such as stimulating the central nervous system, relieving fatigue and drowsiness. This study aims to determine the validation of the analytical method for determining caffeine content in robusta coffee, where the sample used is coffee from Kalimantan and Sulawesi. The analytical method used to determine caffeine levels in coffee is UV-Vis spectrophotometry. Parameters in method validation are linearity, LOD and LOQ, precision, and accuracy. The validation test performed showed linear results where the value of r2 was 0,9927. The limit value of detection (LOD) obtained is 25,9344 and the value limit quantity (LOQ) obtained is 78,5893. The results of the accuracy test are expressed in %recovery, which is 106,7%. In the final stage a precision test was carried out where the RSD value obtained was 1,5937%. In determining the caffeine content, the caffeine content for Sulawesi coffee was 0,466 mg/g and for Kalimantan coffee was 0,591 mg/g.