The invention discloses a madecassoside efficient preparation method based on
yeast metabolic engineering and a madecassoside compound cosmetic composition. Three
glycosyl transferases CaGlcT1, CaGlcT2 and CaRhaT are screened from a
centella asiatica
transcriptome, after the catalytic activity of the
glycosyl transferases is verified,
polygene co-expression is performed in
saccharomyces cerevisiae, and
madecassic acid can be catalyzed to synthesize madecassoside. After
fermentation condition optimization and fed-
batch fermentation, the conversion yield of madecassoside reaches 582 mg / L from 165 mg / L, 3.5 times of yield increase is achieved, the purity of obtained madecassoside reaches 95% or above, and commercial application and scientific research requirements are met. The obtained madecassoside is compounded with the
chrysanthellum indicum extract and the purslane
herb extract, so that the synergistic anti-oxidation and whitening effects are achieved. A new scheme is provided for green and intelligent manufacturing of cosmetic raw materials.