The invention discloses a preparation method of a sweet
osmanthus extract with high yield and high
aroma retention. The method comprises the steps of sweet-scented
osmanthus picking, precooling, sorting,
freeze drying and subcritical n-
butane extraction. The specific
aroma components, namely
linalool oxide, trans-
linalool oxide, beta-ionol and dihydro-beta-ionol, of the
osmanthus fragrans extract obtained through vacuum
freeze drying are characteristic
aroma components of the
osmanthus fragrans extract, and the aroma substances of the
osmanthus fragrans extract obtained through subcritical extraction are the highest in retention and the most abundant in quantity. According to the method, the loss of volatile components of the sweet-scented osmanthus extract is small, the overall fragrance of the sweet-scented osmanthus is good, the obtained sweet-scented osmanthus extract is rich in fragrance and good in quality, the yield of the sweet-scented osmanthus extract is greatly increased, and the method is simple in process, convenient to operate, high in economic benefit, suitable for large-scale industrial production and application and good in market prospect.