Digestion – carried out with heat, by immersing the plant in melted fat (also known as hot enfleurage).
The final product is known as a floral pomade.
b. PNEUMATIC METHOD: similar in principle to the enfleurage process.
b. PNEUMATIC METHOD: similar in principle to the enfleurage process.
It involves the passage of a current of hot air through the flowers.
The air, laden with suspended (extracted) volatile oil, is then passed through a spray of melted fat in which the volatile oil is absorbed.
Beyond its critical point, a fluid can have the density of a liquid & the viscosity of a gas therefore diffuses well through solids, resulting in a good solvent.
Beyond its critical point, a fluid can have the density of a liquid & the viscosity of a gas therefore diffuses well through solids, resulting in a good solvent.
Chemical breeds commonly occur in plants containing volatile oils, e.g. Thyme (Thymus vulgaris) – has 7 different chemotypes, each with slightly different types & amounts of volatile oils.
Chemical breeds commonly occur in plants containing volatile oils, e.g. Thyme (Thymus vulgaris) – has 7 different chemotypes, each with slightly different types & amounts of volatile oils.
Proportions of the different constituents of a volatile oil may vary greatly throughout its development. Wide ranges are commonly found in fennel, carrot and coriander (linalool is higher in ripe fruit than unripe fruit). Mentha (peppermint) is also greatly affected by the vegetative cycle.
Proportions of the different constituents of a volatile oil may vary greatly throughout its development. Wide ranges are commonly found in fennel, carrot and coriander (linalool is higher in ripe fruit than unripe fruit). Mentha (peppermint) is also greatly affected by the vegetative cycle.
Temperature, humidity, duration of daylight (radiation), and wind patterns all have a direct influence on volatile oil content, especially in those herbs that have superficial histological storage structures (e.g. glandular trichomes). When the localization is deeper, the oil quality is more constant.
Temperature, humidity, duration of daylight (radiation), and wind patterns all have a direct influence on volatile oil content, especially in those herbs that have superficial histological storage structures (e.g. glandular trichomes). When the localization is deeper, the oil quality is more constant.
e.g. Peppermint: long days & temperate nights higher yields of oil & menthofuran. Cold nights lead to an increase in menthol.
e.g. Peppermint: long days & temperate nights higher yields of oil & menthofuran. Cold nights lead to an increase in menthol.
Laurus nobilis (Bay) [volatile oil] is greater in the southern hemisphere than the northern.
Citrus: higher temperatures = higher oil content.
Cultivation practices also play an important factor to the yield & quality of the final product.
