Quantitative determination of total phenols in strawberry leaves

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A new procedure has been developed for the quantitative determination of polyphenolic compounds in strawberry (Fragaria orientalis) leaves by means of spectrophotometry in the visible spectral range. The procedure is based on the oxidation of phenolic compounds by the Folin-Denis reagent. The relative error of determination does not exceed 3.8% at a confidence probability of P = 95%. Optimum conditions for the Folin-Denis reaction have been established.

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