Results 31 to 40 of about 7,318 (257)
Safety evaluation of vitamin A in growing dogs [PDF]
, 2011 The safe upper limit for inclusion of vitamin A in complete diets for growing dogs is uncertain, with the result that current recommendations range from 5.24 to 104.80 μmol retinol (5000 to 100 000 IU vitamin A)/4184 kJ (1000 kcal) metabolisable energy ...
Brenten, Thomas +6 more
core +2 more sources
PLoS ONE, 2022 Chronic alcohol consumption leads to a spectrum of liver disease that is associated with significant global mortality and morbidity. Alcohol is known to deplete hepatic vitamin A content, which has been linked to the pathogenesis of alcoholic liver ...
Afroza Ferdouse +5 more
doaj +3 more sources
Journal of Lipid Research, 1992 An efficient protocol is described for the study of the kinetics of retinyl esters in whole plasma and several lipoprotein fractions following the consumption of an oral fat load containing vitamin A (retinol).
G Ruotolo, H Zhang, V Bentsianov, NA Le
doaj +1 more source
Biological Functions of RBP4 and Its Relevance for Human Diseases
Frontiers in Physiology, 2021 Retinol binding protein 4 (RBP4) is a member of the lipocalin family and the major transport protein of the hydrophobic molecule retinol, also known as vitamin A, in the circulation.
Julia S. Steinhoff +3 more
doaj +1 more source
Downregulation of Fzd6 and Cthrc1 and upregulation of olfactory receptors and protocadherins by dietary beta-carotene in lungs of Bcmo1-/- mice. [PDF]
, 2010 An ongoing controversy exists on beneficial versus harmful effects of high beta-carotene (BC) intake, especially for the lung. To elucidate potential mechanisms, we studied effects of BC on lung gene expression.
Amengual, J. +9 more
core +2 more sources
Sensitive Analysis of Retinyl Esters by Isocratic Adsorption Chromatography [PDF]
Clinical Chemistry and Laboratory Medicine, 1989 A sensitive method for the determination of retinyl esters, including their geometric isomers, by isocratic adsorption HPLC is described. The development of a special recycling system allows the separation of all-trans-, 13-cis, 11-cis- and 9-cis-retinyl palmitate, -stearate, -oleate, -palmitoleate and -linoleate with short retention times and high ...
Biesalski, H. K., Weiser, H.
openaire +3 more sources
Journal of Lipid Research, 1988 A simple isocratic high performance liquid chromatography (HPLC) system is described that allows separation and identification of cholesteryl esters, triglycerides, ubiquinone, alpha-tocopherol, dolichol, cholesterol, 7-dehydrocholesterol, and retinol ...
M D Greenspan +3 more
doaj +1 more source
Analysis of Vitamin A in Multivitamin Products
Регуляторные исследования и экспертиза лекарственных средств, 2021 Vitamin A is present in multivitamin products mainly in the form of retinol esters: retinyl acetate, retinyl palmitate, and beta carotene—retinol precursor (dimer) found in plants, which is capable of converting into retinol in liver cells.
A. S. Alekseeva +5 more
doaj +1 more source
Blue light regenerates functional visual pigments in mammals through a retinyl-phospholipid intermediate. [PDF]
, 2017 The light absorbing chromophore in opsin visual pigments is the protonated Schiff base of 11-cis-retinaldehyde (11cRAL). Absorption of a photon isomerizes 11cRAL to all-trans-retinaldehyde (atRAL), briefly activating the pigment before it dissociates ...
Fain, Gordon L +6 more
core +1 more source
Retinol esterification by mammary gland microsomes from the lactating rat.
Journal of Lipid Research, 1982 Because vitamin A in milk is largely present as esterified retinol while blood plasma predominantly contains unesterified retinol, experiments were conducted to determine whether membranes from the lactating mammary gland are able to synthesize retinyl ...
A C Ross
doaj +1 more source