Determination of the Content of Total Polyphenol for Hops by Folin-Ciocaileu
Objective: To estabilsh an UV method for determination of the content of total polyphenol for hops.Method: Folin-Ciocaileu was adopted determining the content of total polyphenol by UV at 765 nm.Result:The total polyphenol was linear in the range of 0.049-0.595 g·L-1 with the relative standard deviation r = 0.999 4.The average recovery was 99.7% , 101.7% ,98.3%.Conclusion :The method is accurate and simple with good reproducibility, and can control the quailty of this preparation effectively.