71748-58-8Relevant articles and documents
AN IMPROVED PROCESS FOR THE PREPARATION OF 4-OXOISOTRETINOIN
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Page/Page column 12-13, (2022/02/28)
The present invention relates to an improved process for the preparation of 4-Oxoisotretinoin and purification process of 4-Oxoisotretinoin (I) and crystalline 5 form of 4-Oxoisotretinoin (I).
A sensitive and specific method for measurement of multiple retinoids in human serum with UHPLC-MS/MS
Arnold, Samuel L. M.,Amory, John K.,Walsh, Thomas J.,Isoherranen, Nina
experimental part, p. 587 - 598 (2012/05/31)
Retinol (vitamin A) circulates at 1-4 μM concentration and is easily measured in serum. However, retinol is biologically inactive. Its metabolite, retinoic acid (RA), is believed to be responsible for biological effects of vitamin A, and hence the measurement of retinol concentrations is of limited value. A UHPLC-MS/MS method using isotope-labeled internal standards was developed and validated for quantitative analysis of endogenous RA isomers and metabolites. The method was used to measure retinoids in serum samples from 20 healthy men. In the fed state, the measured concentrations were 3.1 ± 0.2 nM for at RA, 0.1 ± 0.02 nM for 9-cisRA, 5.3 ± 1.3 nM for 13-cisRA, 0.4 ± 0.4 nM for 9,13-dicisRA, and 17.2 ± 6.8 nM for 4oxo-13-cisRA. The concentrations of the retinoids were not significantly different when measured after an overnight fast (3.0 ± 0.1 nM for atRA, 0.09 ± 0.01nM for 9-cisRA, 3.9 ± 0.2 nM for 13-cisRA, 0.3 ± 0.1 nM for 9,13-dicisRA, and 11.9 ± 1.6 nM for 4oxo-13-cisRA). 11-cisRA and 4OH-RA were not detected in human serum. The high sensitivity of the MS/MS method combined with the UHPLC separation power allowed detection of endogenous 9-cis RA and 4oxo-atRA for the first time in human serum. Copyright
All-Trans-Retinol: All-Trans-13,14-Dihydroretinol Saturase and Methods of Its Use
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, (2008/12/08)
Compositions of all-trans-retinol: all-trans-13,14-dihydroretinal saturase and methods of use thereof are provided.