Evaluation of Analytical Methods to Determine Regulatory Compliance of Coffee Leaf Tea

: The leaves of the coffee plant Coffea are traditionally used in several countries worldwide to prepare tea-like beverages using aqueous infusion in hot water. There are currently no tested methods available to check the regulatory compliance of coffee leaf tea according to the European Union (EU) novel food authorization. This study shows that standard ISO methods for tea analysis could be transferred without modifications to coffee leaf tea analysis. The only difference found was a much lower content of some catechins in coffee leaf tea compared to Camellia sinensis tea, but the methods were clearly applicable to be used to control the EU’s maximum limits for coffee leaf tea . Author Contributions: Conceptualization, D.W.L.; methodology, V.S.; formal analysis, V.S.; inves-tigation, V.S., M.S., P.B.; resources, D.W.L.; data curation, V.S.; writing—original draft preparation, V.S.; writing—review and editing, D.W.L., M.S., P.B., V.G., M.R., S.S., Y.Z.; visualization, V.S.; su-pervision, D.W.L., Y.Z.