Spectrophotometric Determination of Gallotannins in Beer

Inskip, Ervin B; King, Perry; Ziegler, Howard W

doi:10.1093/jaoac/56.6.1362

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Spectrophotometric Determination of Gallotannins in Beer

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Abstract

A method for the determination of traces of gallotannins in beer, in the presence of other natural tannins, has been developed. The procedure is based on the formation of a deep blue iron-tannin complex which is evaluated spectrophotometrically at 530 nm. Dimethyl sulfoxide is used to solubilize a haze that usually forms. Reproducibility of the method is quite good.

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