There are usually a large number of hydroxyl groups in the structure of plant polysaccharides. Through hydrogen bonding, it has good hydration ability, and has the characteristics of moisture absorption and moisture retention. As a moisturizing agent, plant polysaccharides have been widely used in various cosmetics. The polysaccharides of many plant extracts can improve the moisturizing effect of skin and reduce water loss even at low concentrations.
Vegetable oil can form a water lipid film on the surface of the skin, which not only has a moisturizing effect, but also makes the skin waterproof. Vegetable oil can strengthen the skin barrier and affect the reconstruction of stratum corneum, prevent the loss of skin moisture, and normalize sebaceous glands. .
. In addition, the synergistic effect is better after compounding with some plant extracts, which is very effective in preventing skin dryness;
It is widely distributed in higher plants and has rich structural and functional diversity. According to different aglycone structures, saponins are divided into triterpenoid saponins and steroidal saponins. Most saponins are the combination of hydrophobic aglycones and hydrophilic glycosyls, which makes saponins have high amphiphilic affinity, and have the characteristics of moisturizing, foaming and emulsifying.
Hydroxyasiaticoside: Centella asiatica extract, which is widely used in cosmetics, has moisturizing, promoting skin wound healing, anti-inflammatory and antioxidant effects; Centella asiatica extract combined with hyaluronic acid and glycerol emulsion has a lasting moisturizing and moisturizing effect on the skin, while improving the skin barrier function.
Plant flavonoids not only have certain hygroscopicity, but also have a variety of biological activities. Adding flavonoids in cosmetics can help restore the elasticity and luster of dry and loose skin. Quercetin, a flavonoid, widely exists in plants.
Chamomile extract: it can enhance the moisturizing effect of skin, repair skin dryness and water shortage, balance oil secretion, and has more obvious effect on soothing sensitive skin.
It widely exists in plants and contains hydrophilic phenolic hydroxyl groups, which combine with water through hydrogen bonds to reduce skin moisture loss, showing a certain moisturizing effect.
Tea polyphenols: typical polyphenols with moisturizing effect. Tea polyphenols not only have the effects of moisturizing, sunscreen, tyrosinase inhibition and anti-aging, but also can promote the differentiation of keratinocytes and the formation of skin barrier, and promote wound healing. In addition, tea polyphenols can also shift the skin tissue fluid rich in water and reduce the viscosity of intercellular space. ; That is, when used in cosmetic formula, it has better effect in a relatively dry environment.
The composition of many plant extracts is relatively complex, and there are many types of natural products, so the application of plant extracts in cosmetic products still needs to be continuously explored.