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- W2026225822 abstract "The existence of an extracellular α-amylase, which is secreted by virus tumors from the roots of Rumex acetosa grown in vitro, has been demonstrated and the properties of the enzyme have been studied. As far as the authors are aware, this is the first enzyme demonstrated to be secreted from intact cells of higher plants. An assay for the quantitative determination of this enzyme is presented. This assay is based on the spectrophotometric determination of the decrease in color of the starch-iodine complex due to the activity of the amylase on the starch substrate. Among the factors discussed which affect the density of the starch-iodine complex are iodine concentration, temperature, and ionic strength. The optimum pH for activity of this enzyme is 4.6, both in acetate and citrate-phosphate buffers. At pH 4.6 in 0.02 M acetate buffer, the Q10 for the hydrolysis of starch by the enzyme is 1.6 in the range of 20–40 °C. The activation energy in this range calculated by the Arrhenius equation is 8000 cal./ mole. This α-amylase is protected by calcium and is sensitive to low pH values as are the cereal α-amylases. The energy of activation for the heat denaturation of the enzyme is 43,000 cal./mole, as calculated by the Arrhenius equation." @default.
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- W2026225822 date "1951-06-01" @default.
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- W2026225822 title "Secretion of α-amylase by Rumex virus tumors in vitro. Properties and assay" @default.
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- W2026225822 doi "https://doi.org/10.1016/0003-9861(51)90234-2" @default.
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