KINETICS AND MECHANISM OF OXIDATION OF SUCROSE BY NBROMONICOTINAMIDE (NBN)
Dr. L. Pushpalatha* and T. Sangeetha
ABSTRACT
Kinetics study of oxidation of sucrose, by aqueous alkaline solution of N-Bromonicotinamide (NBN) has been
carried out in the temperature range 308-323K. The constancy of pseudo –first order rate constant at different
[NBN] at constant [sucrose] indicates the reaction exhibits zero order about the oxidant. At constant [OH-],
[NBN], the plot of log (Et-E∞) (where Et is the e.m.f. of the cell at time t and E∞, the corresponding value at the
completion of the reaction) Vs time is linear, indicating a first order dependence of rate on [sucrose]. The rate
constant increases in direct proportionality with the increase in the concentration of sucrose, proving the reaction
is of first order in [sucrose]. The rate increases proportionally with the increase in [KOH]. Addition of
nicotinamide (NA) has no effect. Increase in ionic strength of the medium does not change the rate. Increase in
temperature increases the rate of oxidation and plot of log kobs Vs reciprocal of temperature is linear. The oxidation
of sucrose by NBN was studied at different temperatures (308K to 323K) and the activation parameters were
evaluated. The stoichiometry of the reaction was found to be 1:1. 1, 2 –enediol is found to be the reactive
intermediate. Arabinonic acid, glycolic acid and formic acid are the products of oxidation.
Keywords: Sucrose, N-Bromonicotinamide, oxidation, mechanism, kinetics.
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