Heating effect of Ginger (Zingiber officinale Rosc) in content of volatile oil and Oleoresin

Abstract

The influence of various heating treatments on the oleoresin and volatile oil content of ginger rhizome had been studied. The heating treatments employed included heating in an air oven at 60°C, 120°C, 180°C and burning in a charcoal fire for 15 minutes. Heating at above 60°C and burning reduced the total volatile oil content. All heating treatments reduced gingerol and shogaol content of ginger rhizome. Heating at 180°C gave highest concentration of the major oil components of ginger oil such as camphene, phellandrene, E-citral, Z-citral, ar-curcumene, zingiberene, β-bisabolene and β-sesquiphellandrene.