This study monitored the caffeine content of ready-to-drink coffee and verified the appropriateness of the labeling. The caffeine content was analyzed using HPLC. The average caffeine content of cold brew coffee was 0.31-1.04 mg/mL, with an average of 0.55 mg/mL. The average content of product was 147.27 mg/bottle, and taking into account the recommended daily intake, an adult can consume 2.7 bottles. Americano coffee was 0.15- 0.38 mg/mL, with an average of 0.28 mg/mL. The average content of product was 110.42 mg/bottle, and considering the recommended daily intake, an adult can consume 3.6 bottles. The caffeine content of decaffeinated cold brew coffee was 5.14 mg/bottle and compared to Americano coffee, more than 95% of the caffeine was removed. In addition, we verified the tolerance level of the total caffeine content in ready-to-drink coffee, and none of them exceeded 120%, signifying that all commercial products were effectively managed.

Materials and Methods
    실험재료
    표준용액 제조
    분석방법
    시험법 검증
Results and Discussion
    시험법 검증
    조제커피 음료 카페인 함량
    표시사항 적합성
국문요약
Conflict of interests
ORCID
References

• 서예은(을지대학교 식품산업외식학과) | Ye Eun Seo (Department of Food Technology & Service, Eulji University, Seongnam, Korea)
• 이유정(을지대학교 식품산업외식학과) | Yoojeong Lee (Department of Food Technology & Service, Eulji University, Seongnam, Korea)
• 김정환(을지대학교 식품산업외식학과) | Jung Hoan Kim (Department of Food Technology & Service, Eulji University, Seongnam, Korea) Corresponding author