REACTIVITIES OF SOME ALDOSES TOWARDS IODINE IN ALKALINE AQUEOUS MEDIUM

Authors

  • R. Azmat Department of Chemistry, Jinnah University for Women, Nazimabad, Karachi, Pakistan
  • S. S. Nizami Department of Chemistry, University of Karachi, Karachi, Pakistan

DOI:

https://doi.org/10.71330/thenucleus.2006.1038

Abstract

The kinetics studies of oxidation of some reducing sugars by aqueous alkaline solution of iodine investigated. Results demonstrated that iodine in the presence of alkali converted into hypoiodous acid which was effective oxidizing species. Reaction between iodine and sugars was slowest reaction. The rate of oxidation of sugars was affected by change in pH of the medium and maximum at pH 11.4 where the concentration of hypoiodous acid was maximum which oxidized the sugars into respective acids. The rate of oxidation followed first order kinetics with respect to substrate and obeyed zero order kinetics with that of iodine. Change in ionic strength of the medium showed no effect on the rate of oxidation indicating that reaction occured between molecular species and there was no ionic species present in the rate determining step. Reaction was affected by the change in temperature and value of energy of activation corresponding to glucose, galactose, D-mannose and L-arabinose were 10.16 kJ/mol, 12.17 kJ/mol, 14.00 kJ/mol and 20.22 kJ/mol respectively.

References

E.L. Walkali, M. Ahmed and D.M. Wagnerova., Collection Czech Chem. Comm., 41, No. 1 (1976) 14.

K. Neelu, U. Yay and K. Santosh, Transition Met. Chem., 25, No. 4 (2000) 461.

A. Badel, G. Descotes and J. Mentech, Carbohydr. Res., 4 (1990) 232.

W.C. Vasueva, M.I.Taha and W. Saeed, J. Inorg. Nucl. Chem. 34, No. 10 (1972) 3159.

B.P. Singh, V.P. Singh and B.B. Singh, J. Ind. Chem. Soc., 3 (1989) 876.

S.S. Nizami, R. Azmat and F. Uddin., J. Saudi. Chem. Soc., 9, No. 1 (2005) 189.

K.K.G. Sen, Basu and S. Nath, Carbohydr. Res. 80, No. 2 (1980) 223.

M.P. Sah, J. Ind. Chem. Soc., 72, No. 3 (1995) 173.

A.K. Singh, V. Singh, A.K.V. Singh and G.N. Singh., Baharat Carbohydr. Res., 337, No. 4 (2002) 345.

R.S. Singh, Ind. J. Chem. Soc., 23, No. 3 (1999) 139.

A.K. Singh, C. Deepti and S. Rahmani., Carbohydr. Res., 1 (1999) 157.

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Published

06-07-2020

How to Cite

[1]
R. Azmat and S. S. Nizami, “REACTIVITIES OF SOME ALDOSES TOWARDS IODINE IN ALKALINE AQUEOUS MEDIUM”, The Nucleus, vol. 43, no. 1-4, pp. 177–184, Jul. 2020.

Issue

Vol. 43 No. 1-4 (2006)

Section

Articles

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