In order to investigate the effect of phosphate buffer pH value in GB/T 21733-2008 appendix A test method on tea polyphenol content in tea beverage(clear form),the tea polyphenol content in three tea beverage samples was tested under different pH phosphate buffer conditions.The results showed that the higher the pH value of phosphate buffer,the higher the content of tea polyphenols in tea beverage(transparent).When testing tea polyphenol content in tea beverage(transparent form)according to GB/T 21733-2008 appendix A test method,the pH of phosphate buffer should be adjusted to 7.5,otherwise,the determination result will be inaccurate.
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