Journal of Applied Electrochemistry

, Volume 33, Issue 2, pp 187–196 | Cite as

Degradation kinetics of ascorbic acid during ohmic heating with stainless steel electrodes

  • A. Assiry
  • S.K. Sastry
  • C. Samaranayake
Article

Abstract

Ascorbic acid degradation experiments were performed in buffer solution at pH 3.5 using a batch ohmic heater with uncoated stainless steel electrodes. The electrical conductivity of the buffer solution was adjusted using sodium chloride. The concentration of ascorbic acid was found using an HPLC technique. Kinetics of degradation can be described adequately by a first order model for both conventional and ohmic treatments, but unlike conventional heating, the temperature dependence of degradation for some ohmic treatments cannot be represented by the Arrhenius relation. During ohmic heating, power, temperature and NaCl content affect the degradation rate. A number of reactions, including electrode reactions, electrolysis of the solution, as well as reactions between electrode materials and electrolysis products may influence the reaction mechanism as well as kinetic parameters. At the highest power and salt content, citrate complexation and a significant loss of buffering capacity were noted, resulting in an increase in pH. The results underline the importance of inert electrode coatings, or the use of high frequency power for control of electrochemical reactions.

ascorbic acid degradation kinetics high frequency power control inert electrode coatings 

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References

  1. 1.
    C.H. Biss, S.A. Coombes and P.J. Skudder, in R.W. Field and J.A. Howell (Eds), ‘Process Engineering in the Food Industry’ (Elsevier, 1989), p. 17.Google Scholar
  2. 2.
    G.V. Barbosa-Cánovas, M. Gongora-Nieto, U. Pothakamury and B. Swanson, ‘Processing of Foods with Pulsed Electric Fields’ (Academic Press, 1999).Google Scholar
  3. 3.
    A.A.P. de Alwisand P.J. Fryer, Chem. Eng. Sci. 45 (1990) 1547.Google Scholar
  4. 4.
    S.K. Sastry, J. Food Proc. Engr. 15 (1992) 263.Google Scholar
  5. 5.
    C. Amatore, M. Berthou and S. Hebert. J. Electroanal. Chem. 457 (1998) 191.Google Scholar
  6. 6.
    T. Tzedakis, R. Basseguy and M. Comtat, J. Appl. Electrochem. 29 (1999) 821.Google Scholar
  7. 7.
    A.E. Bender, ‘Nutritional Changes in Food Processing, Developments in Foods Preservation’, Vol. 4 (Elsevier, 1987), p. 1.Google Scholar
  8. 8.
    J.F. Gregory III, in T. Richardson (Ed), ‘Chemical changes of vitamins during food processing’ (AVI, 1985).Google Scholar
  9. 9.
    M.H. Eison-Perchonok and T.W. Downes, J. Food Sci. 47 (1982) 765.Google Scholar
  10. 10.
    Y.C. Lee, J.R. Kirk, C.L. Bedford and D.R. Heldman, J. Food Sci. 42 (1977) 640.Google Scholar
  11. 11.
    D.B. Dennison and J.R. Kirk J. Food Sci. 43 (1978) 609.Google Scholar
  12. 12.
    I. Saguy, I.J. Kopelman and S.J. Mizrahi. J. Food Proc. Engr. 2 (1978) 213.Google Scholar
  13. 13.
    N.S. Kincal and C. Giray, Int. J. Food Sci. and Technol. 22 (1987) 249.Google Scholar
  14. 14.
    B.M. Laing, D.L. Schlueter and T.P. Labuza, J. Food Sci. 43 (1978) 1440.Google Scholar
  15. 15.
    S. Palaniappan, S.K. Sastry and E.R. Richter, Biotech. & Bioeng. 39 (1992) 225.Google Scholar
  16. 16.
    R. Howard, T. Peterson and P. Kastl, J. Chrom. 414 (1987) 434–439.Google Scholar
  17. 17.
    C. Zapsalis and R.A. Beck, ‘Food Chemistry and Nutritional Biochemistry’ (Wiley, New York, 1986).Google Scholar
  18. 18.
    S.R. Tannenbaum, V.R. Young and D. Lorient, in O. Fennema (Ed), ‘Food Chemistry’ (Marcel Dekker, 1976), p. 477.Google Scholar
  19. 19.
    T.P. Coultate, ‘Food: the Chemistry of its Components’ (Royal Society of Chemistry, 1996).Google Scholar
  20. 20.
    R.P. Wayne, in A.A. Frimer (Ed), ‘Singlet O2 Vol. I. Physical-Chemical Aspects’ (CRC, 1985), p. 82.Google Scholar
  21. 21.
    J.A. Dean (Ed), ‘Lange'sHandboo k of Chemistry’, (McGraw-Hill, 13th edn, 1985).Google Scholar
  22. 22.
    J. Ko'nya, J. Electrochem. Soc. 126 (1979) 54.Google Scholar

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • A. Assiry
    • 1
  • S.K. Sastry
    • 2
  • C. Samaranayake
    • 2
  1. 1.King Saud UniversityRiyadhSaudi Arabia
  2. 2.Department of Food, Agricultural and Biological EngineeringThe Ohio State UniversityColumbusUSA

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