Noun
retinyl (plural retinyls)
(organic chemistry, especially in combination) The univalent radical derived from retinol
All forms of vitamin A have a beta-ionone ring to which an isoprenoid chain is attached, called a retinyl group. Source: Internet
Further esterification into all-"trans" retinyl esters allow for storage of all-trans-retinol within the pigment epithelial cells to be reused when needed. Source: Internet
Hydrolysis of retinyl esters results in retinol, while provitamin A carotenoids can be cleaved to produce retinal by carotene dioxygenase in the intestinal mucosa. Source: Internet
CRC Press, ISBN 0849326648, pp. 22–39 The orange pigment of carrots (beta-carotene) can be represented as two connected retinyl groups, which are used in the body to contribute to vitamin A levels. Source: Internet
Animal species differ greatly in their ability to convert retinyl (beta- ionone ) containing carotenoids to retinals. Source: Internet
Also, retinyl palmitate (RP), or other esters of retinol used frequently in sun protection, also raise stability and skin safety questions. Source: Internet