• Publications
  • Influence
Biodiscrimination of the eight alpha-tocopherol stereoisomers results in preferential accumulation of the four 2R forms in tissues and plasma of rats.
According to the USP, 2R,4'R,8'R-alpha-tocopheryl acetate (RRR-alpha-TAc) is 1.36 times more active than all-rac-alpha-tocopheryl acetate (all-rac-alpha-TAc). The all-rac form contains 12.5% each ofExpand
  • 78
  • 4
Biological activity of glycosides of vitamin D3 and 1 alpha-hydroxyvitamin D3.
For the first time, the biological activity of the newly synthesized glycosides of vitamin D3 and of 1 alpha(OH)D3 has been studied in rats, chickens, and Japanese quails. Glucosidation did notExpand
  • 4
  • 2
The vitamin A activity of beta-carotene.
In rats (parameters: growth, epithelial protection and liver storage), and in chicks (liver storage), it has been demonstrated that the conversion of beta-carotene to vitamin A diminishes inverselyExpand
  • 69
  • 1
Stereoisomers of alpha-tocopheryl acetate--characterization of the samples by physico-chemical methods and determination of biological activities in the rat resorption-gestation test.
  • H. Weiser, M. Vecchi
  • Chemistry, Medicine
  • International journal for vitamin and nutrition…
  • 1981
Stereoisomers of alpha-tocopheryl acetate (alpha-TA) have been identified and characterized by means of a recently developed gas-liquid chromatographic technique prior to the determination of theirExpand
  • 58
  • 1
Stereoisomers of alpha-tocopheryl acetate. III. Simultaneous determination of resorption-gestation and myopathy in rats as a means of evaluating biopotency ratios of all-rac- and RRR-alpha-tocopheryl
The resorption-gestation test furnishes information on a more complex vitamin activity than is the case with other vitamin E tests, so that correspondingly more importance attaches to the results. AExpand
  • 28
  • 1
Bioactivity of cis and dicis isomers of vitamin A esters.
In order to declare the accurate vitamin A effectiveness of foodstuffs and synthetic vitamin A preparations, the biological activity of the individual isomers has to be known. Total activity isExpand
  • 25
  • 1
[Diagnosis of clinical vitamin B1 deficiency in cattle].
  • 3
  • 1
Vitamin A deficiency increases noise susceptibility in guinea pigs.
The effect of vitamin A deficiency in guinea pigs on noise-induced temporary threshold shift (TTS) was evaluated after short (15 min) acoustic overstimulation with a moderate (90 dB) broad-band whiteExpand
  • 19
  • 1
Retinol deficiency and Dipetalonema viteae infection in the hamster.
Following chronic retinol (vitamin A) deprivation leading to exhaustion of liver vitamin A reserves below 50 I.U. per liver hamsters were fed diets either deficient in ("Rd":250 I.U.A./kg inExpand
  • 7
  • 1