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Determination of total polyphenols in the zinc complex of polyphenol by Folin-Ciocalteu colorimetry

Xiuhua Liu

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Abstract

A quantitative determination method for total polyphenols content in the Zinc complex of polyphenol was developed by using Folin-Ciocalteu colorimetry with gallic acid as reference compound.The results showed that the linear range of calibration curve was 0-8.54 mg·L-1.The RSD(relative standard deviation) of stability,precision,repeatability and recovery rate were in the range of 0.39%-1.23%.Therefore,FC method is a convenient,fast and accurate method to determine the total polyphenols of tea products.

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What this paper is about

A quantitative determination method for total polyphenols content in the Zinc complex of polyphenol was developed by using Folin-Ciocalteu colorimetry with gallic acid as reference compound.The results showed that the linear range of calibration curve was 0-8.54 mg·L-1.The RSD(relative standard deviation) of stability,precision,repeatability and recovery rate were in the range of 0.39%-1.23%.Therefore,FC method is a convenient,fast and accurate method to determine the total polyphenols of tea products.

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Available abstract

A quantitative determination method for total polyphenols content in the Zinc complex of polyphenol was developed by using Folin-Ciocalteu colorimetry with gallic acid as reference compound.The results showed that the linear range of calibration curve was 0-8.54 mg·L-1.The RSD(relative standard deviation) of stability,precision,repeatability and recovery rate were in the range of 0.39%-1.23%.Therefore,FC method is a convenient,fast and accurate method to determine the total polyphenols of tea products.

Key concepts: Colorimetry, Polyphenol, Gallic acid, Repeatability, Chemistry, Chromatography, Calibration curve, Zinc

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