Preparation method for essential oil of fresh wintersweet flowers

Abstract

The invention provides a preparation method for essential oil of fresh wintersweet flowers. The preparation method for the essential oil of the fresh wintersweet flowers comprises the following steps: pretreatment, extraction, separation and molecular distillation. Oil and water separated wintersweet flower extracts are sent to molecular distillation equipment for molecular distillation, the column temperature of a distillation column is controlled to be 100 to 110 DEG C, and the distillation pressure is controlled at 1 to 3Pa, thus the essential oil of the wintersweet flowers is controlled. According to the invention, the fresh wintersweet flowers are extracted by utilizing a supercritical CO2 extraction technology, and then separated through an oil-water separator, and distilled to obtain the essential oil of the wintersweet flowers, so that the problems of seriously damaged effective components and the like in the traditional flower-fragrance essential oil extraction process are solved and the loss of volatile components in the fresh flower pretreatment drying process is reduced by adopting a fresh flower extraction method; furthermore, the prepared essential oil is more realistic in aroma.

Description

technical field [0001] The invention belongs to the technical field of deep processing of agricultural and sideline products, and in particular relates to a preparation method of wintersweet flower essential oil. Background technique [0002] Wintersweet is a plant of the genus Wintersweet. The leaves and flowers of this genus emit fragrance and contain volatile aromatic oil substances. It is a traditional garden flower and raw material greening plant in my country. It has color, fragrance, shape, posture and rhyme. Good ornamental value. It has been planted in a large area in Chongqing and other places and used in food processing such as tea, wine, candy and so on. [0003] Wintersweet flower has an elegant and rich aroma, and has volatile aromatic oil. It is also a traditional tea flower in our country. Essential oil is an important raw material of flavor and fragrance. It has been widely used in health care, beauty, agriculture and food industry abroad. However, at prese...

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Problems solved by technology

[0004] At present, the supercritical fluid extraction technology is almost always used in the extraction of floral essential oils in the form of dried flowers. At the same time, there is little research on the extraction of effective components of wintersweet flowers, especially the direct extraction of flowers is rarely reported; the traditional process is mainly steam distillation. However, there will be problems such as damage to the heat-sensitive components in the wintersweet essential oil due to long-term high temperature and the safety of solvent residues in the solvent extraction wintersweet essential oil.

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