Catechins are in a polyphenol group contained in green tea that yield a bitter taste. They have various physiological functions and have been reported to inhibit high blood pressure, control blood cholesterol, control blood-sugar level, and provide antioxidative, anti-aging, anti-bacterial and anti-allergic activities. The main constituents of catechins in green tea are epicatechin, epigallocatechin, epicatechin gallate, and epigallocatechin gallate.
In this report, catechins in green tea were measured and analyzed by Ultra High-performance Liquid Chromatography(UHPLC) with Photodiode Array Detection.
Figure 1 shows the chemical structures of 6 catechins and caffeine.
Figure 2 shows a chromatogram and a contour plot of 6 catechines and caffeine. It shows that the 7 different constituents are completely separated within 4 minutes.
Figure 3 shows a chromatogram and a contour plot of green tea. It shows that the 7 different constituents and impurities were separated properly.