Lotus leaf extract, preparation method and application thereof

Abstract

The application discloses a lotus leaf extract and a preparation method and application thereof, and belongs to the technical field of plant extraction. The method comprises the following steps: (1) pre-treating lotus leaves; (2) adding water to the treated lotus leaves, and then adding biological enzymes to perform enzymolysis, so as to obtain an enzymolysis product; (3) mixing the enzymolysis product and an ethanol solution to perform primary low-temperature extraction, filtering to obtain filtrate A and residue A, mixing the residue A and an extraction agent to perform secondary low-temperature extraction, filtering to obtain filtrate B and residue B, combining the filtrate A and the filtrate B, performing suction filtration, and performing vacuum concentration, so as to obtain a flow extract; and (4) performing low-temperature freezing or membrane separation on the flow extract, and performing vacuum concentration, so as to obtain the lotus leaf extract. The lotus leaf extract prepared by adopting the process of combining biological enzymolysis with graded low-temperature extraction has more full aroma, more rich fragrance and more prominent characteristics, and the low-temperature freezing or membrane separation process is used for enriching the characteristic aroma of the lotus leaf crude extract.

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