UV-Vis Spectrophotometer Analysis for Caffeine Level Determination of Arabica, Liberica, and Robusta Coffee in Jambi Province, Indonesia

One type of plant that thrives in Indonesia is the coffee plant. There are several types of coffee products in Indonesia, namely Arabica, Liberica, and Robusta coffee. Coffee contains caffeine compounds which if consumed in excess can affect a person's body condition. In this study, the caffeine Level of Arabica, Liberica, and Robusta coffee was measured using a linear regression equation obtained from the relationship between caffeine content and the absorbance value of a standard caffeine solution. The results of this study show that the smallest caffeine level of Arabica coffee is 0.183%, whereas the highest caffeine level of Arabica coffee is 0.867%, that the smallest caffeine level of Liberica coffee is 0.266%, whereas the highest caffeine level of Liberica coffee is 1.051%, and the smallest caffeine level of Robusta coffee is 0.589%, whereas the highest caffeine level of Robusta coffee is 1.071%. Based on regression analysis of caffeine level and the length of roasting time, it can be concluded that the longer the coffee bean roasting process, the higher the caffeine value produced.