Investigation of some chemical transformation of leaf constituents during flu-curing and sun-curing of Nicotina tabacum L. Var. F.C special in Sulaimaniyah region (in Iraq)

agua alcaloides alkaloids azote azucares calcio calcium calentamiento carbohidratos carbohydrates chauffage composition eau feuille glucide heating hojas leaves nicotiana tabacum nicotina nicotine nitrogen ph sucres sugars tabac tabaco tobacco water