English: Carbon numbering schemas for fatty acids:
Systematic IUPAC numbering () starting from 1 at the carboxyl carbon (blue).
Old Greek letter labels () starting at the carbon after the carboxyl (green).
Omega-minus numbering () starting at the end opposite to the carboxyl (red).
The position of a double bond is always the carbon closest to the carboxyl, even in the omega numbering. Thus a acid with 18 carbons (as shown) has the bond between carbons and .
A common mistake is to say that the last carbon is . Another common mistake is to say that the position of a bond in omega-notation is the number of the carbon closest to the end. For double bonds, these two mistakes happen to compensate each other. However, for substitutions and other purposes, they don't: a hydroxyl at is at carbon 15, not 16.[1]
Note also that the "−" in the omega-notation is a minus sign, and should in principle be read "omega minus three". However, it is very common (especially in non-scientific literature) to write it "ω-3" (with a hyphen/dash) and read it as "omega-three".
Eesti: Süsinikuaatomite nummerdamine.
Galego: Numeración dos carbonos dos ácidos graxos; neste caso nun ácido graxo de 18 carbonos. Os números sistemáticos (IUPAC) están en azul. A notación omega está en vermello. A notación con letras gregas está en verde.
Latina: Acidi adipati structura: sinistra acidum carboxylicum cum atomo carboni numero caeruleo 1, dextrorsum catena aliphatica cum carboniis numeris caeruleis increscentibus. Numeri rubri ad ultimum carbonium nomine omega spectant: hoc ultimum enim descriptionis qualitatis propriae sui numero quoque 1 (rubro) numeratur. Nota cursum numerandi hic contrarium esse.
Тыва дыл: Стеаридинниг кислота (Атомнарның физиологтук дугаарлаан ёзузу кызыл өң-биле, а химиктиг — көк өң-биле көргүстүнген).
Data
Orixinal: 31 de agosto de 2020; Vector: 3 de febreiro de 2024
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↑ (23 June 1975). "ω-1, ω-2 and ω-3 Hydroxylation of long-chain fatty acids, amides and alcohols by a soluble enzyme system from Bacillus megatyerium". Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism388 (3): 305-317. Elsevier. DOI:10.1016/0005-2760(75)90089-2. ISSN0005-2760.
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Carbon numbering schemes for fatty acids: Cx, alpha-beta, omega-minus-x
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