Extraction method of ginger oil
The main methods for extracting ginger oil products from ginger are steam distillation, solvent extraction, and supercritical CO2 extraction.
Crush fresh ginger or dried ginger before steaming, and then pass in steam under normal pressure or pressure to distill out the ginger oil at a temperature lower than its boiling point;
Mainly obtain the more volatile essential oil in ginger, and some phenol derivatives such as gingerol, because of its unique molecular structure, it is difficult to steam out with steam;
Only part of the flavor substances in ginger can be extracted, and the high temperature of the distillation process will cause harmful changes in the composition, smell and flavor of ginger oil;
Chemical composition of the ginger oil obtained by the solvent extraction method has a lot to do with the selected solvent, but the solvent method is susceptible to residual solvent contamination and precipitation and discoloration, and its use is limited.
Supercritical CO2 extraction method for ginger oil
Modern ginger essential oil uses supercritical CO2 extraction to extract ginger essential oil, which uses CO2 as a solvent to extract ginger essential oil from ginger in a supercritical state.
The ginger essential oil prepared by CO2 extraction has a wide variety of aroma components, including 38 ingredients. The main aroma components are: limonene (2.09%), α-pinene (1.90%), camphene (5.08%), farnesene (28.4%). %), β-phellandrene (4.10%), β-sesquiphellandrene (31.3%), gingerene (5.32%), caryophyllene (2.02%) and other olefins, the main spicy ingredient is 6-ginger Alcohol (1.04%).
Ginger essential oil has a pure and natural aroma, complete flavor and stable quality. It retains the flavor components of ginger to the maximum extent and is a highly concentrated product with the original flavor.