Sell 7-dehydrocholesterol @China (Mainland)

Synonyms: (3)-7-Dehydrochlesterol;(3beta)-Cholesta-5,7-dien-3-ol;(3-beta)-cholesta-7-dien-3-ol;(3beta)-cholesta-7-dien-3-ol;3-Hydroxycholesta-5,7-diene;5,7-Cholestandien-3.beta.-ol;5,7-Cholestandien-3beta-ol;7,8-Didehydrocholesterol

Product Details:

Place of Origin: China

Certification: ISO9001

Brand:YuanCheng

Payment & Shipping Terms:

Minimum Order Quantity:1kg

Supply Ability:500kg/month

Delivery Time:within 24 hours after payment

Payment Terms:Western Union, MoneyGram, T/T

Appeatance:white to off-white fine crystalline powder

Package:25kg/bucket 

Purity:95%

Product Description:

CAS: 434-16-2

MF: C27H44O

MW: 384.64

EINECS: 207-100-5

7-Dehydrocholesterol is a zoosterol that functions in the serum as a cholesterol precursor, and is converted to vitamin D3 in the skin, therefore functioning as provitamin-D3. The presence of this compound in human skin enables humans to manufacture vitamin D3 from ultra-violet rays in the sun light, via an intermediate isomer pre-vitamin D3. It is also found in the milk of several mammalian species. In insects it is a precursor for the hormone ecdysone, required for reaching adulthood.It was discovered by Nobel-laureate organic chemist Adolf Windaus

Synthesis of pre-vitamin D3 in the skin involves UVB radiation which effectively penetrates only the epidermal layers of skin. 7-Dehydrocholesterol absorbs UV light most effectively at wavelengths between 290-320nm and thus the production of vitamin D3 will only occur at those wavelengths. The two most important factors that govern the generation of pre-vitamin D3 are the quantity (intensity) and quality (appropriate wavelength) of the UVB irradiation reaching the 7-dehydrocholesterol deep in the stratum basale and stratum spinosum.[4] Another important consideration is the quantity of 7-dehydrocholesterol present in the skin. Under normal circumstances, ample quantities of 7-dehydrocholesterol (about 25-50 mg/cm2 of skin) are available in the stratum spinosum and stratum basale of human skin to meet the body's vitamin D requirements.

Usage:

1. Important intermediate in the synthesis of vitamin D3 

2. Skin sunscreen additive in cosmetics 

3. Other laboratory reagents