A highly sensitive method for quantifying gallocatechin gallate and its epimer using a catechin-specific peptide

► Highly sensitive quantifying method for GCg and EGCg have developed. ► The method uses a catechin-binding peptide derived from 67-kDa laminin receptor. ► The method is capable of quantifying EGCg in the range of 0.1-2.0 mg L−1.