Aerobic Oxidation of D-Glucose by Methylene Green in Alkaline Aqueous Solution by Visible Spectrophotometry
Abstract:
Color fading was observed during the Methylene Green (MG) catalyzed oxidation of D-glucose (RH) in alkaline aqueous solution. The kinetics of aerobic oxidation of D-glucose with MG+ was investigated by change in optical density of the dye using spectrophotometer. The reaction was first order with respect to the concentration of substrate. The oxidation proceeds via complex formation between glucose and methylene green and the rate constant of the decay of the complex was determined. The oxidation-reduction reactions were observed at various experimental parameters like concentration of methylene green as well as glucose, ionic strength of the medium and temperature. Rate of reaction was found to be dependent upon concentration of glucose as a reducing agent and independent upon the concentration of dye. An increase in the temperature results in elevation of rate of reaction. Activation parameters such as Ea, ΔH*, ΔG* and ΔS* were determined by investigating rate of reaction at different temperature with different ionic strength. A mechanism consistent with above investigations has been proposed.
How to cite this article
Rafia Azmat, Samreen Ahmed, Sitwat Qureshi, Faryal Vali Mohammed and Fahim Uddin, 2006. Aerobic Oxidation of D-Glucose by Methylene Green in Alkaline Aqueous Solution by Visible Spectrophotometry. Journal of Applied Sciences, 6: 2784-2788.
REFERENCES
Adamcikova, L., K. Pavlikova and P. Sevcik, 1999. The methylene blue-D-glucose-O-system.Oxidation of D-glucose in the presence and absence of oxygen. Int. J. Chem. Kinetics, 31: 463-468.
Adamcikova, L., M. Hupkova and P. Sevcik, 2000. Pattern formation in the methylene blue-fructose-oxygen system in aqueous solution and in gel system. Collect. Czech. Chem. Commun., 65: 1394-1402.
Cook, A.G., R.M. Toliver and J.E. Willams, 1994. The blue bottle experiment revisted. J. Chem., 71: 160-161.
De Lucca, A.R., S.A. Santos, A.C. Pereira and L.T. Kubota, 2002. Electrochemical behavior and electro catalytic study of the methylene green coated on modified silica gel. Interface Sci., 254: 113-119.
Jonnalagadda, S.B. and N.R. Gellapalli, 2000. Kinetics of reduction of toluidene blue with sulfite. Kinetics salt effect in elucidation of mechanism. J. Chem. Educ., 77: 506-508.
Kamat, P.V. and N.N. Lichtin, 1982. Electron transfer in the quenching of protonated triplate thionine and methylene blue by ground state thionine. J. Photochem., 18: 197-209.
Liu, Y., S. Yamamoto, Y. Fujiyocna and Y. Sueishi, 2000. Kinetic study on the reversible hydride transfer between methylene blue and thionine. Phys. Chem. Chem. Phys., 2: 2367-2371.
Direct Link
Liu, Y., S. Yamamoto and Y. Sueishi, 2001. Photos induce hydride transfer reaction between methylene blue and leuco crystal violet. J. Photochem. Photobiol. Chem., 143: 153-159.
Mowry, S. and O. Paul, 1999. Kintics of methylene blue reduction by ascorbic acid. J. Chem. Educ., 76: 970-974.
Quitevis, E.L., J. Martorell, Y. Chang and T.W. Scott, 2000. Photo reduction of Methylene blue on cadmium sulfide powder. Chem. Phys. Lett., 319: 138-144.
CrossRef
Snehalatha, T., K.C. Rajanna and P.K. Salprakash, 1997. Methylene blue ascrobic acid. J. Chem. Educ., 74: 228-233.
Direct Link
Uddin, F., 2000. Kinetics of photochemical reactions of thionine with thiourea. Eur. J. Organ. Chem., 2: 1345-1351.
CrossRef
Uddin, F., Q.Z. Hasnain and M.Y.K. Yousuf-Zai, 2001. Photo reduction of thiazine dye with trimethyl amine. Arab J. Sci. Eng., 26: 109-175.
Uddin, F. and Q.Z. Hasnain, 2002. Photochemical reduction of thionine with dimethyl amine. Kuwait J. Sci. Eng., 29: 67-85.
© Science Alert. All Rights Reserved