Coffee is the most popular beverage in the Republic of Korea, other than Korea’s traditional green tea. Coffee contains many physiologically active substances, such as chlorogenic acids (CGAs) and caffeine. Previous studies have focused on the content of CGAs and caffeine in brewed coffee. This study quantified the total amounts of CGAs and caffeine using high-performance liquid chromatography coupled with a diode array detector in 83 various coffee-related products, such as instant coffee, roasted and ground coffee sold in supermarkets, ready-to-drink coffee, and Americano coffee sold in franchise restaurants in the Republic of Korea. According to the results of this study, the coffee with the highest content of CGAs was unblended roasted and ground coffee sold in supermarkets, with a mean value of ± mg/serving, and the most caffeine-rich coffee was Americano coffee from coffee shops, with a mean value of ± mg/serving. The caffeine/CGA ratios were determined in various coffee beverages because they are useful parameters for estimating the human health. The lowest mean caffeine/CGAs ratio of ± was found in unblended ground coffee sold in supermarkets, and the highest mean ratio of ± was found in milk-added ready-to-drink coffee. | Contents of chlorogenic acids and caffeine in various coffee-related products
