scholarly journals Plasma turnover of 3,4-didehydroretinol (vitamin A2) increases in vitamin A-deficient rats fed low versus high dietary fat

2008 ◽  
Vol 50 (4) ◽  
pp. 694-703 ◽  
Author(s):  
Anne L. Escaron ◽  
Michael H. Green ◽  
Sherry A. Tanumihardjo
Keyword(s):  
Vitamin A ◽  
Dietary Fat ◽  
Vitamin A2

Selective utilization of serum vitamin A for visual pigment synthesis

1989 ◽  
Vol 142 (1) ◽  
pp. 207-214
Author(s):  
A. T. Tsin ◽  
S. N. Gentles ◽  
E. A. Castillo
Keyword(s):  
Vitamin A ◽  
Visual Pigment ◽  
Carassius Auratus ◽  
High Performance ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Serum Vitamin ◽  
Pigment Synthesis ◽  
Goldfish Carassius Auratus ◽  
Vitamin A2

Two groups of goldfish (Carassius auratus) were subjected to light and temperature conditions known to promote a contrast in their scotopic visual pigment compositions. After 3 weeks, the porphyropsin/rhodopsin ratio in the neuroretina of these goldfish ranged from 99% porphyropsin in one group to 59% in the other. Samples of blood, liver and retinal pigment epithelium (RPE) were also removed from these animals and analysed by high-performance liquid chromatography (HPLC) for vitamin A composition. There was consistently more vitamin A2 than vitamin A1 (over 50% vitamin A2) in both vitamin A alcohol and vitamin A esters extracted from the liver and the RPE. In contrast, only 30% of all vitamin A extracted from the blood was vitamin A2. These observations suggest that it is mainly vitamin A1 that is transported in the blood, whereas vitamin A2 is selectively retained in the liver and in the RPE and used to form porphyropsin in the eye.

scholarly journals Studies in vitamin A. 21. Retinene2 and vitamin A2

1952 ◽  
Vol 52 (4) ◽  
pp. 542-547 ◽  
Author(s):  
H. R. Cama ◽  
P. D. Dalvi ◽  
R. A. Morton ◽  
M. K. Salah
Keyword(s):  
Vitamin A ◽  
Vitamin A2

Visual pigments of the vitamin A-deficient, thyroidectomized rat following vitamin A2 administration

1971 ◽  
Vol 11 (3) ◽  
pp. 177-187 ◽  
Author(s):  
Jerome T. Pearlman ◽  
Frederick Crescitelli ◽  
Nola J. Allston ◽  
Robert J. Petrus ◽  
Jean v.K. Sillman ◽  
...  
Keyword(s):  
Vitamin A ◽  
Visual Pigments ◽  
Vitamin A2

scholarly journals Carotene-rich plant foods ingested with minimal dietary fat enhance the total-body vitamin A pool size in Filipino schoolchildren as assessed by stable-isotope-dilution methodology

2007 ◽  
Vol 85 (4) ◽  
pp. 1041-1049 ◽  
Author(s):  
Judy D Ribaya-Mercado ◽  
Cherry C Maramag ◽  
Lorena W Tengco ◽  
Gregory G Dolnikowski ◽  
Jeffrey B Blumberg ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Vitamin A ◽  
Isotope Dilution ◽  
Dietary Fat ◽  
Pool Size ◽  
Plant Foods ◽  
Stable Isotope Dilution ◽  
Total Body

3,4-Didehydroretinol (vitamin A2) has vitamin A activity in the rat without conversion to retinol

1986 ◽  
Vol 14 (5) ◽  
pp. 950-950 ◽  
Author(s):  
THERESA C. M. WILSON ◽  
GEORGE A. J. PITT
Keyword(s):  
Vitamin A ◽  
Vitamin A2
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