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. 97 0091-150X/07/4102-0097