Vitamine K — Wikipédia
On distingue trois formes de cette vitamine, qui toutes appartiennent à la famille des quinones, car elles ont dans leur structure chimique une naphtoquinone nécessaire aux transferts d’électrons. Elles se distinguent par la nature de la chaîne carbonée attachée à la quinone.
Vitamin K | C31H46O2 | CID 5280483 - PubChem
Vitamin K | C31H46O2 | CID 5280483 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.
Vitamin E – Structure, Functions, Synthesis, Deficiency
2024年4月1日 · Vitamin E, scientifically recognized as a group of eight fat-soluble compounds, encompasses four tocopherols and four tocotrienols. This vitamin plays a pivotal role in our body, primarily functioning as a fat-soluble antioxidant. Its main objective is to safeguard cell membranes from the detrimental effects of reactive oxygen species.
Quelle est la structure de la vitamine K - Spiegato
La vitamine K est une vitamine essentielle que le corps utilise dans le processus de coagulation du sang, et la structure de la vitamine K dépend de sa forme chimique. Il existe trois formes principales de cette vitamine, connues sous le nom de vitamines K1, K2 et K3.
Chemical structures of vitamin K and metabolites
Vitamin K occurs in dietary supply in two major forms: phylloquinone (vitamin K1) and menaquinones (collectively referred as vitamin K2). Phylloquinone is derived from plants. There are at...
Vitamin E: structure and forms - ScienceDirect
2020年1月1日 · In the present chapter the structure, biosynthesis, forms, occurrence, and nutritional value of vitamin E have been described. The data concerning novel forms of vitamin E, such as tocomonoenols or tocodienols, have been also included, and methods for extraction, separation, and detection of isoprenoid chromanols are described.
Vitamin K – sources, physiological role, kinetics, deficiency ...
Vitamin K is not a single compound but is a term for many similar compounds that have the physiological function of this vitamin (Fig. S1 in the Supporting Information online). They share a common structure, the 2-methyl-1,4-naphthoquinone core, also known as menadione. The simplest form, which contains only this core, is known as vitamin K 3.
Relationship between Structure and Biological Activity of Various ...
Vitamin K is involved many biological processes, such as the regulation of blood coagulation, prevention of vascular calcification, bone metabolism and modulation of cell proliferation. Menaquinones (MK) and phylloquinone vary in biological activity, showing different bioavailability, half-life and transport mechanisms.
-La vitamine K est le cofacteur d'une carboxylase microsomale. -La vitamine K sert d'antidote en cas d'absorption accidentelle de mort aux rats chez les humains et les animaux de compagnie. CARENCE : Hémorragies cutanées, nasales, urinaires ou digestives (hématémèse, melaena). Au …
Quelle est la structure de la vitamine E - Spiegato
La structure générale de la vitamine E se compose de deux cycles d’atomes liés, dont l’un comprend un atome d’oxygène lié à des atomes de carbone et dont l’autre est un cycle aromatique. Un cycle aromatique est un cycle hexagonal composé de six carbones liés.