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Further Studies on Factors Affecting the Efflux of Betacyanin from Beet Root: A Note on Thermal Effects
Author(s) -
Siegel S. M.
Publication year - 1969
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1969.tb07382.x
Subject(s) - efflux , chemistry , activation energy , membrane , atmospheric temperature range , biophysics , biochemistry , biology , organic chemistry , thermodynamics , physics
As judged by betacyanin efflux, beet root tissue differs in stability toward O 2 at low and high temperatures (45–60°C and 60–100°C respectively). The effect of temperature itself can he divided into a high activation energy (93 Kcal mol −1 ) process in the lower temperature range and a low activation energy process (19 Kcal mor −1 ) in the higher range (> 60°C). From these data it is suggested that initially, elevating temperatures bring about reversible conformational changes in the membrane. With continuing increase in temperature in the presence of O 2 , membrane chemical groups susceptible to oxidation are exposed and, upon oxidation, render conformational changes irreversible.