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[Polyphenoloxidase content of penicillium glaucum].

Borgyogyaszati es venerologiaia szemle, 2003
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Inactivation of Polyphenoloxidase by Pulsed Light

Journal of Food Science, 2013
Abstract The effect of pulsed light on the inactivation of polyphenoloxidase (PPO) in model solutions was investigated focusing on the effect of enzyme concentration and total energy dose of the treatment. PPO inactivation increased with the dose of the treatment.
Lara Manzocco, Agnese Panozzo
exaly   +4 more sources

Inhibition of Polyphenoloxidase by Sulfite

Journal of Food Science, 1986
ABSTRACT When polyphenoloxidase (PPO) was exposed to sulfite prior to susbstrate addition, inhibition was irreversible. Trials to regenerate PPO activity, using extensive dialysis, column chromatography, and addition of copper salts were not successful. Increased concentrations of sulfite and pH levels less than 5
L. A. SAYAVEDRA‐SOTO, M. W. MONTGOMERY
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Polyphenoloxidase (‘Tyrosinase’): Purification and Molecular Properties

Nature, 1957
POLYPHENOLOXIDASE has been prepared from potatoes by Kubowitz1 and from cultivated mushrooms (Psalliota campestris) by Keilin and Mann2. The degree of purification attained was certainly very high, and it is conceivable that the enzyme was obtained in a pure or near pure state.
D, Kertesz, R, Zito
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Study on Barley and Malt Polyphenoloxidase. I. Chromatography of Barley, Steeped Barley, and Malt Polyphenoloxidase

Journal of the American Society of Brewing Chemists, 1977
A comparative chromatography of polyphenoloxidase isolated from barley, steeped barley, and green malt was made.
N. Van Huynh, J. Jerumanis
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State of Copper in Polyphenoloxidase (Tyrosinase)

Nature, 1957
IT was shown in the classical work of Kubowitz1 and of Keilin and Mann2 that the prosthetic group of polyphenoloxidase is constituted by copper. Since then it has been unanimously admitted that the metal of the enzyme is in the bivalent state and that the catalytic activity of the enzyme is based on the change of valency cupric ⇌ cuprous, as follows ...
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Mini-chromatofocusing of plant and fungal polyphenoloxidases

Analytical Biochemistry, 1988
Mini-chromatofocusing was used to estimate the isoelectric points of mung bean polyphenoloxidase (5.4), broad bean polyphenoloxidase (5.4-5.7), and mushroom tyrosinase (4.5) in crude and purified samples. Using 1 to 2 ml of Polybuffer exchanger and 20 to 25 ml of Polybuffer 74, isoelectric points for the above enzymes were obtained in less than 2 h ...
B M, Moore, W H, Flurkey
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Properties of carrot polyphenoloxidase

Phytochemistry, 1995
A latent phenoloxidase (PPO) was purified in the presence of protease inhibitors from carrot cells to electrophoretic homogeneity. The inactive enzyme had a M(r) of ca 59 000 under denaturating conditions as judged by SDS-PAGE. When stored in the absence of protease inhibitors, PPO in a crude extract was converted to forms with a lower M(r).
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Interaction between Thiourea and Insect Polyphenoloxidase

Nature, 1959
POLYPHENOLOXIDASES of plant and animal origin are known to be inhibited by copper complexing sulphur compounds. When investigating the effect of thiourea on polyphenoloxidase of the wax-moth, Galleria mellonella L. (Lepidoptera), we noticed that degree of inhibition diminished during an aerobic incubation of the enzyme with the inhibitor and the ...
W, CHMURZYNSKA, L, WOJTCZAK
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Inhibition of Banana Polyphenoloxidase by 2-Mercaptobenzothiazole

Science, 1967
2-Mercaptobenzothiazole is an exceptionally potent inhibitor of banana polyphenoloxidase; it significantly delays the onset of substrate oxidation at concentrations as low as 10 -7 M and causes prolonged inhibition at 2 × 10 -5 M or higher.
J K, Palmer, J B, Roberts
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