The effects of Cu (II) ion and polyvinylpyrrolidone (PVP) (K-30) concentrations on the oxidation kinetics of ascorbic acid (Vitamin C: H 2 A) in aerated and acetate buffered solution (pH = 4.5) have been investigated at 25 ° C. The study was carried out in the concentration range of PVP between 0.2% and 0.6%, and in the concentration range of Cu (II) between 0.785 and 3.14 x 10 −7 M. The initial concentrations of H 2A were 2.8–11.3 x 10−5 M. The changes in H 2 A concentrations during the reactions were determined from absorbance measurements at a wavelength of 264.0 nm, using direct UV spectrophotometric method. Molecular weight (MW) of the PVP has been redetermined as a mean MW, using viscosimetric method.
The rate equation of the Cu (II) ion — catalyzed reaction was found to be first order with respect to H 2 A. The oxidation rate constant decreased with increasing PVP amount for a fixed Cu (II) ion concentration, whereas it increased with increasing Cu (II) ion concentration for a fixed PVP level. It also increased with increasing concentration of H 2 A for a fixed Cu (II) ion concentration.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Martell, A.E., 1989, Ascorbic Acid: And Its Chemistry, Metabolism Uses. In: P.A., Seib B M.Tolbert (eds.), Advances in Chemistry Series 200, Am. Chem. Soc. Publishing, Washington, DC, p 153
Khan, M.M.T. and Martel, A.E., 1967a, J. Am. Chem. Soc., 89, 4176–4185
Ogata, Y., Kasugi, Y. and Morimoto, T., 1968, Tetrahedron, 24 (1968), 4057–4066
Eison-Perchonok, M.H. and Downes, T.W., 1982, J. Food Sci., 47 (1982), 765–773
Khan, M.M.T. and Martel, A.E., 1967b, J. Am. Chem. Soc., 89, 7104–7110
Ohta, Y., Shiraishi, N., Nishikawa, T. and Nishikimi, M., 2000, Biochim. Biophys. Acta, 1474, 378–382
Imer, F., Koseoglu, A. and Sefer, T., 1989, J. Sci. Tech., Univ Marmara, 6, 119–129
Imer, F., Sönmezoğlu, I.C. and Kozcaz, M., 2003, Ital. J. Food Sci., 15 (4), 521–529
Blecher, L., Lorenz, D.H., Lowd, H.L., Wood, A.S. Wyman, D.P., 1980. R.L. Davidson (ed.), Handbook of Water Soluble Gums and Resins, Chapter 21, Polyvinylpyrrolidone, McGraw-Hill, New York
Melent'eva, T.A., Verenikina, S.G., Dolgushina, N.N., Bolyakina, M.V., Gunar, V.L. and Taber, A . M., 1993, Khim-Farm. Zh., 27 (8), 60–63
Liu, M., Yan, X., Liu, H. and Yu, W., 2000, React. Funct. Polym., 44 (1), 55–64
Angi, S., 2005, MSc. thesis, Yildiz Technical University, Istanbul, Turkey
Imer, F. and Kiliç, H., 2004, Proceedings of the 4th Aegean Analytical Chemistry Days, pp 599–601
Fung, Y.-S. and Luk, S.-F., 1985, Analyst, 110, 201–204
Lau, O.-W., Luk, S.-F. and Wong, K.-S., 1986, Analyst, 111, 665–670
Hsieh, Y.-H.P. and Harris, N.D., 1993, J. Agric. Food Chem., 41, 259–262
Weast, R.C., 1982, CRC Handbook of Chemistry and Physics, 62nd ed., CRC, Boca Raton, FL
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2009 Springer Science + Business Media B.V
About this chapter
Cite this chapter
Angi, S., Kiliç, H., Imer, F. (2009). Oxidation of L-Ascorbic Acid in Copper(II) Ion – Catalyzed Polyvinylpyrrolidone Solutions. In: Şener, B. (eds) Innovations in Chemical Biology. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6955-0_35
Download citation
DOI: https://doi.org/10.1007/978-1-4020-6955-0_35
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-6954-3
Online ISBN: 978-1-4020-6955-0
eBook Packages: Biomedical and Life SciencesBiomedical and Life Sciences (R0)