KSIĄŻKI POWIĄZANE ZE SŁOWEM «LUMISTEROL»
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1
Perspectives in Biochemistry
Lumisterol contains the same ring system as ergosterol. The other irradiation
products, tachysterol, vitamin D2, toxi- sterol and the two suprasterols on
dehydrogenation with selenium no longer give the hydrocarbon C18H16,
characteristic for ...
2
Bioactive Foods and Extracts: Cancer Treatment and Prevention
With continued UVR exposure, pre-D3 is converted to the biologically inactive
lumisterol. Tachysterol is also formed but, like pre-D3, does not accumulate with
extended UVR. The formation of lumisterol and tachysterol is reversible and can
be ...
Ronald Ross Watson, Victor R. Preedy, 2010
3
Advanced Nutrition and Human Metabolism
Excess production of vitamin D3 in the skin is prevented through the generation
of inactive metabolites, especially lumisterol, which is also produced from 7-
dehydrocholesterol in the presence of ultraviolet light, and tachysterol, which is ...
Sareen Gropper, Jack Smith, 2012
UVirra- diation further converts pre-D3 to lumisterol and tachysterol. Both the
degree of epidermal pigmentation and the intensity of exposure correlate with the
time required to achieve this maximal concentration of pre-D3, but do not alter the
...
Peter M. Elias, Kenneth R. Feingold, 2005
5
Vitamins: Their Role in the Human Body
As soon as previtamin D3 stores are depleted, exposure of cutaneous lumisterol
and tachysterol to solar UV radiation may promote their isomerization back to
previtamin D3 (Holick et al., 1981). The photochemical conversion of previtamin
D 3 ...
course of these studies several substances were discovered, isolated, and
chemically characterized; they include lumisterol, tachysterol, precalciferol, as
well as the suprasterols I and II. (The structures of many of these are given in Fig.
3-6.) ...
7
Vitamin D Handbook: Structures, Synonyms, and Properties
4,9,1 1,1 2,14,1 5, 1 6,1 7-decahydro-1 H-cyclopenta[a]phenanthren-3-ol.
Lumisterol; Lumisterol 3; 9B,10oc-Ergosta-5,7,22-trien- 3P-ol; EINECS 207-487-0
; 6436872; 474-69-1; Prepared by irradiation of ergosterol. Converted by
irradiation to ...
G. W. A. Milne, M. Delander, 2008
8
Primer on the Metabolic Bone Diseases and Disorders of ...
Although irradiation of 7-DHC was known to produce pre-vitamin D3 (pre-Dg,
which subsequently undergoes a temperature-dependent rearrangement of the
triene structure to form D3, lumisterol, and tachysterol), the physiologic regulation
of ...
9
Why Does Vitamin D Matter?
Some of this pre-vitamin D3 is also broken down by UVB to inactive metabolites
such as tachysterol and lumisterol, limiting the cutaneous production of vitamin
D3. Therefore, excessive sun exposure cannot lead to vitamin D toxicity [4, 5].
10
Organic Photochemistry: Principles and Applications
Its reverse action, also photochemical, can also produce the isomeric lumisterol if
the electrocyclic reaction takes place in the opposite direction. The production of
tachysterol is simply the result of a photochemical (E)— (Z) isomerization.
