Column chromatography separation with a polyamide stationary phase can separate analyzed compound
based on the polarity. About 10% ethanol-water elution was used for separating catechins with a fairly high polarity, such as (+) -catechin (C), (−) -EC, (−) -EGC, and (+) -gallocatechin
(GC). Whereas, elution with 95% ethanol was for desorption of EGCG and ECG from polyamide