Dynamic Changes of Major Chemical Components in Tobacco Leaf of Different Maturity during Loose Leaves Baking Process

Harvest maturity is one of the key factors determining the internal quality of cured flue-cured tobacco,in order to obtain cured tobacco with coordinate chemical components,the dynamic changes of main chemical ingredients in mid-mature tobacco leaves,mature tobacco leaves,full ripe flue-cured tobacco leaves during loose leaves baking process were compared.Results indicated that,①The changing trend of nicotine and protein content in tobacco leaves with different mature degree was different during baking process.The changing trend of total nitrogen content was smooth as it did not change a lot in the baking process.The nicotine content in tobacco leaves of different mature degree ranked from high to low in the whole baking process was mid-mature tobacco leaves,mature tobacco leaves,full ripe flue-cured tobacco leaves.Total nitrogen and protein content was much higher in mid-mature tobacco leaves than that in mature tobacco leaves and full ripe flue-cured tobacco leaves.Total nitrogen content in fresh and dry leaves of mature and full ripe flue-cured tobacco leaves was almost the same.The protein content was higher in mature tobacco leaves than in full ripe flue-cured tobacco leaves.② The changing trend of total sugar and restored sugar content in tobacco leaves with different mature degree in the baking process was a same N shape.The total sugar and restored sugar content in baked dry leaves was considerably increased compared with fresh leaves.The total sugar and restored sugar content in tobacco leaves with different mature degree in baking process ranked from high to low was full ripe flue-cured tobacco leaves,mature tobacco leaves,mid-mature tobacco leaves.③ The potassium and chlorine content in cured dry tobacco leaves with different maturity was increased compared to fresh leaves,but the margin was small.After baking was done,the potassium and chlorine content in cured dry tobacco leaves with different mature degree was almost the same.