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- W2129143670 abstract "Crude preparations of peach fruit (Prunus persica Batsch cv. Redskin) polyphenol oxidase (PPO) showed many apparent isoenzyme forms. Some of these forms were probably the result of proteolytic action of peach proteases while other forms were the result of association of PPO with carbohydrate materials. In the presence of protease inhibitors, Trasylol and phenylmethylsul-fonyl fluoride, three apparent isoenzyme forms of PPO were purified to homogeneity. The purification scheme included hydrophobic chromatography on phenyl sepharose CL-4B, hydroxylapatite chromatography, DEAE cellulose chromatography, and gel filtration on Ultrogel AcA 34. Minor contaminants remaining after these steps were separated from PPO by gel electrophoresis. The major PPO isoenzyme form (A) was purified 44 fold with an overall yield of 5.6% and contained no detectable carbohydrates. Isoenzyme forms A' and A' were purified 104 and 67 fold respectively, but still were associated with carbohydrate material. Cesium chloride centrifugation partially removed the carbohydrates associated with PPO A' and A'. Purified peach PPO A showed greater activity toward D-catechin (539%) and pyrogallol(l82%) than to catechol (100%). An apparent K3 of 4, 0.3, and 2 mM was obtained with D-catechin, pyrogallol and catechol, respectively. The enzyme was severely inhibited by 10 μM 2,3-naphthalenediol (91%) and by 10 pM diethyl dithiocarbamate (100%)." @default.
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- W2129143670 date "1980-06-01" @default.
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- W2129143670 title "PURIFICATION OF PEACH POLYPHENOL OXIDASE IN THE PRESENCE OF ADDED PROTEASE INHIBITORS" @default.
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- W2129143670 doi "https://doi.org/10.1111/j.1745-4514.1980.tb00875.x" @default.
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