7-Dehydrocholesterol

• Post Date:

  Feb 02,2016

• Expiry Date:

  Jul 31,2016

• Detailed Description:

  Cas No. :434-16-2 Payment Method: money gram, western union, bank transfer, bit
  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
  

• CAS Registry Number:

  434-16-2

• Synonyms:

  ;Provitamine;7,8-didehydrocholesterol;cholesta-5,7-dien-3-beta-ol;Provitamin D3;cholesta-5,7-dien-3-ol;(3beta)-cholesta-5,7-dien-3-ol;

• Molecular Formula:

  C₂₇H₄₄O

• Molecular Weight:

  384.6377

• Molecular Structure:

  

• Safety Description:

  S24/25:;
  

• Company:

  Zhuzhou Yuancheng Hezhong Technology Development     [ China ]        

• Contact:

  kathyyan

• Tel:

  86-731-22292056

• Fax:

  86-731-22292056

• Email:

  mxy044@yccreate.com