Method for extracting essential oil from peony flowers

Abstract

The invention discloses a method for extracting essential oil from peony flowers. The method comprises the following steps: (1) picking fresh peony petals, adding salt which is 20% to 30% of the peony petals by weight for 3-5 days' pickling; adding distilled water which is 3 to 5 times of the peony petals by weight for crushing of the peony petals; (2) extraction: adding purslane and an extraction agent which are respectively 1-3% and 3-5% of the peony petals by weight; adopting a probe-type ultrasonic generator for 30-50 minutes' ultrasonic extraction; carrying out filtering; collecting the filtrate; adding an ethyl alcohol solution with the mass concentration of 80-90% into the obtained filter residue; repeating ultrasonic extraction and filtration for two times; combining all the filtrates; (3) conducting separation on the mixed liquor with a centrifuge at 5000-6000 revolutions per minute; taking a supernatant; carrying out decompressing and removing of an organic solvent under a thermostatic water-bath condition to obtain the essential oil. The method provided by the invention has the advantages that the extracting time is short, the extraction efficiency is high, the situation that the extracted essential oil contains residual peony pollen is avoided to realize the hypoallergenic function, and reduce the harm to users of allergic constitution.

Description

technical field

[0001] The invention relates to the technical field of peony deep processing, in particular to a method for extracting essential oil from peony flowers. Background technique

[0002] Peony is not only a fine product among ornamental flowers, but also a traditional good medicine. Because peony blooms once a year, the flowering period is only one week, and the petals are delicate and easy to mold after harvesting. Palmitic acid, linoleic acid and linolenic acid are the main types. Unsaturated fatty acids have the effect of lowering blood fat and preventing arteriosclerosis. Peony also contains protein, polyphenols, potassium, calcium, magnesium, phosphorus and other elements, as well as vitamin B and Carotenoids are a kind of natural nutrition and health substances.

[0003] The traditional methods for extracting essential oils from peony flowers are mostly solution extraction and single solution extraction. For fresh petals, due to the poor interface affinity...