【Name】: Grape Skin P.E  

【Latin】: Vitis vinifera L  

【Specifications】:  

Proanthocyanidins: 30, 40, 50  

Polyphenols: 20%, 30%, 50%  

Resveratrol: 5%, 10%  

【CAS Number】: 501-36-0  

【Origin of Raw Material】: China  

【Appearance】: Fine reddish-brown powder  

【Plant Source】: The mature fruit skin of the grapevine Vitis vinifera L., a deciduous woody vine up to 10 meters long. Young stems are smooth or slightly hairy. Leaves are papery, alternate, round or ovate, 10–20 cm wide, often 3–5 lobed, heart-shaped at the base, with coarse and slightly sharp serrations, densely covered with cobweb-like hairs underneath; petioles are 4–8 cm long. Flowers are polygamous, dioecious, with large and long panicles opposite the leaves; flower stalks lack tendrils; calyx is very small, cup-shaped, entire or with indistinct 5-toothed lobes; petals are 5, yellow-green, fused at the apex and not spreading, separated at the base, falling off as a cap-like structure during flowering; stamens are 5; the floral disc is raised, formed by 5 glands, fused with the ovary at the base; ovary is 2-chambered, with 2 ovules per chamber; style is short, conical. The berry is oval to oblong, juicy, turning purplish-black or reddish-green when ripe, covered with a waxy bloom. Flowering occurs in June, and fruiting in September–October.  

【Solubility】: Soluble in water and most organic solvents.  

 II. Technical Specifications  

1. Appearance: Reddish-brown powder;  

2. Total ash ≤ 5%;  

3. Loss on drying ≤ 5.0%;  

4. Heavy metals ≤ 10 ppm (Pb ≤ 2 ppm, Hg ≤ 1 ppm, Cd ≤ 0.5 ppm, As ≤ 2 ppm);  

5. Microorganisms (non-irradiated): Total bacterial count ≤ 1000 CFU/g; Mold and yeast ≤ 100 CFU/g; Salmonella: Negative; E. coli: Negative.  

 III. Packaging and Storage  

【Product Packaging】: Inner double-layer plastic bags, outer aluminum foil bags or cardboard drums.  

【Packaging Specification】: 25 kg/drum  

【Storage Conditions】: Store in a cool, dry place, away from light and high temperatures.  

【Shelf Life】: Three years