Study on the Carbohydrate Change at Different Parts of Fresh Unripe Maize Ears

In this paper,the carbohydrate change at different pcsitions of fresh maize ears during the milk stage was studied.The results showed that the changing curve of the total soluble candy(TSC) content of kernel was a form of parabola and the changing pattern of the sucrose(SUC) content of kernel was similar to that of TSC content,the changing pattern of starch content was straight line,(VS time) and the changing curve of the soluble and acidic sucrose's activity of kernel was a kind of parabola(VS time) during the milk stage.The TSC and SUC content of cob was always higher than kernel,the starch content was lower than kernel.The TSC and SUC content of bract decreased,Slowly,and the TSC content was always higher at early milk stage,these were beneficial for the grouting of maize.As a result,the starch content is lower than cob.When the fresh unripe maize is harvested,it should be kept at low temperature or processed in time to avoid the quick candy conversion to starch and the quality descending.