Polyphenoloxidase activity

DEVECE C, RODRIGUEZ LOPEZ J N, FENOLL L G, TUDELA J, CATALA J M, DE LOS REYES E and GARCIA CANOVAS F (1999) Enzyme inactivation analysis for industrial blanching applications comparison of microwave, conventional, and combination heat treatments on mushroom polyphenoloxidase activity , J g-nc Food Chem, 47 (11) 4506-11. 

Im, J.S., Parkin, K.L., and Von Elbe, J.H., Endogenous polyphenoloxidase activity associated with the black ring defect in canned beet (Beta vulgaris L.) root slices, J. Food ScL, 55, 1042, 1059, 1990. 

Oliveira, J. C., Silva, D. M., Amorim, H. V., Teixeira, A. A., Effects of the origin, pulping types and storage of coffee on the polyphenoloxidase activity and beverage quality, Cientifica, 7, 79, 1979. (CA92 127193v)... 

Lee, C.Y., Kagan, V., Jaworski, A.W., and Brown, S.K., Enzymatic browning in relation to phenolic compounds and polyphenoloxidase activity among various peach cultivars, J. Agric. Food Chem., 38, 99, 1990. 

Humic acids have been shown to slightly inhibit tyrosinase activity by complexing the enzyme (Ruggiero and Radogna, 1988). Allison (2006b) also demonstrated that the addition of humic acid to a soil significantly decreased the polyphenoloxidase activity of the soil. 

A variety of practices are used in North Coast white winemaking to protect wines from the undesirable effects of oxidation. Proper use of S02 is an essential part of North Coast winemaking because it is an effective antioxidant and results in less polyphenoloxidase activity. S02 is added as soon as the grapes are crushed, at levels of 50-100 mg/L, and maintained at 25-30 mg/L free S02 after fermentation, until bottling. At bottling, most white wines have 30-35 mg/L free S02. 

Lopez-Malo, A., Palou, E., Barbosa-Canovas, G.V., Welti-Chanes, J., and Swanson, B.G. Polyphenoloxidase activity and color changes during storage of high hydrostatic pressure treated avocado puree. Food Res. Int, 31, 549, 1998. 

Kingsly, A.R.P, Balasubramaniam, V.M., and Rastogi, N.K. 2009b. Influence of high pressure blanching on polyphenoloxidase activity of peach fruits and its drying behavior. International Journal of Food Properties. 12(3) 671-680. 

Rastogi, N.K., Eshtiaghi, M.N., and Knorr, D. 1999. Effect of combined high pressure and heat treatment on the reduction of peroxidase and polyphenoloxidase activity in red gyape.. Food Biotechnology 13 195-208. 

In certain cases the production of extracellular enzymes can be used as an index of the amount of growth. For example, laccase (polyphenoloxidase) activities have been used to estimate growth of the myceUum of Agarkus biosporus in wheat straw [177]. 

Sims, C.A. Bates, R.P. Mortensen, J.A. Effects of must polyphenoloxidase activity and timing of sulfite addition on the color and quality of Vitis rotundifolia and Euvitis hybrid white wines. Am. J. Enol. Vitic. 1991, 42, 128-132. 

Mihalyi, K., and Vamos-Vigyazo, L., 1976, A method for determining polyphenoloxidase activity in fruits and vegetables applying a natural substrate, Acta Alimen. 5 69. 

Thomas and Nair have recently shown that y-irradiation of whole bananas resulted in an increase in polyphenoloxidase activity in both the skin and the pulp with respect to a number of substrates including dopamine and noradrenaline [100a]. 

Martyn, R.D., Samuelson, D.A. and Freeman, T.E. (1979). Ultrastructural localization of polyphenoloxidase activity in leaves of healthy and diseased waterhyacinth. Phytopathol. 69 1278-1287. 

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