The purpose of this research is For the production and analysis of citric acid from a sample 2 type is jackfruit seed dry and seed เงาะแห้ง with infections as Aspergillus niger Using a recipe 1-6 control condition and not shake shake.Method and titration, determination of moisture content of samples, it was found that dried jackfruit seed moisture content greater than the rambutan seed From the production and analysis of citric acid from seed dried wood and rambutan seed dry with fungi as Aspergillus nigerRambutan seed dry and found that the optimal conditions for production of citric acid, is a condition in which no shake when using jackfruit seed drying. Rambutan seed quantity and dry 10.00 to citric acid than the 15.00, in which foods to the jackfruit seed drying. Rambutan seed and dry volume rate when adding sugar - glucose to citric acid more than no sugar - glucose, qualitative analysis Method of paper chromatography and paper.And the crystallization of citric acid cannot be crystallized. Because the fermentation has concentration is not sufficient to crystallizing citric acid
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