Significado de dehydrocholesterol en en Inglés


Pronunciación /diːˌhʌɪdrə(ʊ)kəˈlɛstərɒl/


mass nounBiochemistry
  • A derivative of cholesterol present in the skin. It can be converted to cholecalciferol (vitamin D₃) by the action of ultraviolet radiation.

    Chemical formula: C₂₇H₄₄O

    ‘In the skin 7 - dehydrocholesterol is converted to cholecalciferol following UV irradiation.’
    • ‘The most important source of vitamin D for all individuals is the sunlight-driven conversion in skin of 7 - dehydrocholesterol to cholecalciferol.’
    • ‘Other types of UV dosimeters are based on the photodamage of DNA in spores, bacteria or bacteriophages or the conversion of 7 - dehydrocholesterol to previtamin D.’
    • ‘Since 7 - dehydrocholesterol is present in the skin in large quantities and only needs sunlight to be activated, vitamin D is often called the ‘sunshine vitamin.’’
    • ‘High energy ultraviolet light enters the skin and causes the photochemical conversion of 7 - dehydrocholesterol to previtamin D 3, which at body temperature undergoes isomerization to vitamin D 3.’


1930s from dehydro- ‘that has lost hydrogen’ + cholesterol.