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In order to improve the heterogeneity of the thermal reaction in a packed celite of the previously reported model roast method, which produced coffee brown pigments from chlorogenic acid and sucrose, two new methods have been designed. (1) Silica sand containing sample solutions in flasks are rotated and heated. This method is useful for the large scale preparation of brown pigments. (2) Test tubes containing small quantity of sample solution and a boiling tip are heated. This is suitable to study details of the time course of browning reaction. The results of the investigation on the first stage of the browning reaction between chlorogenic acid and sucrose by the use of latter method show the formation of coffee brown pigments A, B and C as follows:

Investigation on the First Stage of the Formation of Coffee Brown Pigments by the Use of the Improved Model Roast Method