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Title: Kinetics and mechanism of oxidation of vitamin E by sulphate radical anion in aqueous acetonitrile solution
Authors: Swaraga, Midudhula Sudha
Adinarayana, Mundra
Issue Date: Feb-2004
Publisher: NISCAIR-CSIR, India
Abstract: The photooxidation of vitamin E (α-tocopherol) in the presence of peroxydisulphate (PDS) in aqueous solution at natural pH (7.5) has been carried out in a quantum yield reactor using a high pressure mercury vapour lamp. The rate of photo oxidation increases with increase in [vitamin E], [PDS] and light intensity. The quantum yield increases with increase in [vitamin E] and is independent of [PDS] and light intensity. The plots of log (rate) versus log [PDS] and the log (rate) versus log [vitamin E] are linear with a slope of less than one indicating fractional order dependence of rate on [PDS] as well as on [vitamin E]. On the basis of experimental results and product analysis a probable mechanism is suggested.
Page(s): 303-306
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(02) [February 2004]

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