The project numbered 1482 supported by Agriculture and Foresty Research Grant Committee of The Scientific and Technical Research Council of Turkey was a substructural support project. Its objective was to supply some of the necessary spare parts for the HPLC which is already present at the Food Engineering Department of M.E.T.U. and to supply some chemicals to be used for the HPLC analysis of water soluble vitamins. The support was used to obtain the spare parts of the pre-column and the guard column used for the analysis of the water soluble vitamins. Also a few chemicals are obtained as use-up materials. Among the water soluble vitamins analysis of vitamin C was set up completely so that its analysis could be done routinely. The instrumentation for the HPLC determination of the other water soluble vitamins was also completed. A little bit more work has been needed on the method of analysis before the routine collection of data was possible. For this reason, the reaction kinetics of vitamin C which was processed thermally by a microwave oven has been carried out and the results were discussed in scope of this report. It was found that the degredation of vitamin C which was heated by microwaves followed a first-order reaction kinetics and the k, z and Ea values were calculated. When the results were compared with the k, z and Ea values found in literature for a conventional heating process of vitamin C it was observed that microwave heating caused less vitamin degradation.