The invention discloses a preparation method and application of a
polygonatum sibiricum leaf extract
antioxidant composition, and belongs to the technical field of
natural product extraction and utilization. The method comprises the following steps: by taking waste
polygonatum kingianum leaves as a
raw material, cleaning,
drying at low temperature, breaking walls and crushing, heating, refluxing and extracting by adopting pure water, and performing low-temperature high-speed centrifugal purification and vacuum
freeze drying to obtain the high-activity composition. According to the core technology, various active substances such as total
sugar, flavone and
phenylpropanoid in the
polygonatum kingianum leaves are enriched and reserved to the maximum extent through a full-water-based and
solvent-free green process, and a synergistic anti-oxidation
system is formed. The composition can effectively remove
DPPH and
ABTS free radicals, inhibit generation of
active oxygen in keratinocytes induced by
UVB radiation and improve the activity of
superoxide dismutase in the cells, and has definite in-vitro anti-oxidation and
cell light protection effects. According to the invention, agricultural wastes are recycled, the process is safe, the cost is low, and the obtained composition can be applied to
skin antioxidant products such as face cream, essence and the like.