Larix gmelinii (Latin name: Larix gmelinii) is a species under the genus Larix. Larch is a deciduous tree. Larch is most fond of light and hardy. All are distributed in alpine areas, mainly in eastern Siberia, northeast Mongolia, northeast China and Korea. Larch wood is solid and durable, for construction, poles, sleepers and other uses, the bark can be made of rubber, but also for ornamental trees.

Larch bark is rich in proanthocyanidins, which is the source of antioxidant "Pycnogenol" in the market -- the closely related plant of French pine, and has a wide development and application value in the field of medicine and health care products.

Relying on Beijing Key Laboratory of Plant Resources Research and Development and National Quality Supervision and Testing Center of Aloe products in Light Industry, Through the analysis of the safety, stability, cosmetic efficacy evaluation and cosmetic formula application of proanthocyanidins in larch bark. Conclusion: Larch bark procyanidins can be used in cosmetic formulations, with antioxidant, antibacterial, whitening, moisturizing, inhibiting melanin, uv and other effects.

Larch bark is rich in proanthocyanidins, and the polymer is the product of oxidation and condensation of proanthocyanidins, accounting for about 30% of the total amount of larch proanthocyanidins, showing natural beautiful red, known as red powder or phenolic acids, can be used as food and beverage pigments. Proanthocyanidins are one of the earliest natural dyes used by human beings. They can hydrophobic bond with leather fibrils, silk, natural or artificial cellulose, etc. Hydrogen bond solid combination and coloring, but also with a variety of metal ions by mordant dyeing method. As a natural dye for leather, fabric, paper and wood.

Procyanidin was used as a natural dyeing agent to dye silk. The fastness to wet rubbing and perspiration of the silk fabric was above grade 3, which met the requirements of color fastness of real silk fabric. The uv protection index (UPF) of the dyed fabric is about 20, and it has good anti-UV radiation performance, and can be made into special anti-UV radiation clothing.

The extraction of proanthocyanidins from Larch pointed out the direction of high value utilization of plant resources and the extension of this result will bring a better future for forestry resources.

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