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Shoul this statement "It has been shown in trials that the ingestion of beta carotene at about 30 mg/day increases the rate of lung cancer and prostate cancer" be changed to "It has been shown in trials that the ingestion of beta carotene at about 30 mg/day DECREASES the rate of lung cancer and prostate cancer" —Preceding unsigned comment added by 68.82.186.77 (talk) 12:45, 6 March 2008 (UTC)
The two carotene chemical structures on this page (and related) are wrong. Two carbon atoms are missing from the conjugated central chain.
I just added two paragraphs: 1. the plant sources of beta-carotene 2. short comment on anti-oxidant properties and its use as a dietary supplement. -- Bedrupsbaneman 13:34, 8 Apr 2005 (UTC)
Carotene is the dimer of vitamin A. What does that mean? RickK 00:18 5 Jul 2003 (UTC)
There are more than two forms of carotene. Changed to reflect that. NSiDms 13:54 11 Oct 2005 (UTC)
I've added in a reference about beta carotene and lung cancer Dr prune 12:23, 24 January 2006 (UTC)
I'm doing a science fair project on this and i need to know exactly what beta Carotene is
I have changed the structures, as the old one was wrong. There should be 40 carbon atoms. In old structure (Image:Alpha-carotene.png) there were only 38. Compare it with structure from commons. Polimerek 23:20, 22 June 2006 (UTC)
- I think there is still a problem. Beta-carotene is supposed to have eleven double bonds and this one only has ten. Thejeffftrain 13:46, 08 Aug 2006
The structure is still wrong - it is missing two carbon atoms from the middle (look at the structure on the Bristol University link) Gingekerr 16:17, 29 October 2006 (UTC)
Isn't beta carotene also called a "pro vitamin"? Can someone expand on "pro vitamins"? --68.103.154.140 16:49, 27 June 2006 (UTC)
It is a provitamin, and I added that fact with a link to the provitamin stub to the second paragraph of the article. A provitamin is a substance which animal tissues (particularly human) can convert into the corresponding vitamin. 71.205.13.162 06:51, 27 September 2006 (UTC)
Please write out the names of greek letters when they are first mentioned in ANY article. Thereafter we may use the shorthand. This is a general encyclopedia.
I was wondering if we should include the SMILES notation for the compounds in the article somewhere. It would be good to have them, but they tend to get pretty long in the long compounds. If anyone is wondering:
α-carotene: C\C2=C\CCC(C)(C)C2/C=CC(\C)=C\C=C\C(\C)=C\C=C\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(/C)CCCC1(C)C
β-carotene: CC2(C)CCCC(\C)=C2\C=C\C(\C)=C\C=C\C(\C)=C\C=C\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(/C)CCCC1(C)C
I'm not sure if these are correct, I generated them from the 2 diagrams on the page. If anyone wants the other notations, I can get them pretty easily. Sbrools (talk . contribs) 17:19, 6 May 2007 (UTC)
Why is this noteworthy at all? The bioavailability is about 1/6 compared to supplements, so the 20 mg/day studies would translate to more than 1.4 kg carrots per day. Icek 03:16, 25 October 2007 (UTC)
Can someone please add how many mg per kg you can find in the veggies and fruits in the "dietary source" list. THANKS -- Michael Janich 03:21, 28 October 2007 (UTC)
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I was wondering why the 3D stick model is cis at C6-C7 and C8-C9 (and not in C6'-C7' and C8'-C9') while the strucutral formula further down is all trans. If that is due to photo excitation it should be explained in the text. 2 September 2009 148.79.162.144
Me too - but I had to find for the carbon labeling. Rod57 (talk) 15:55, 7 December 2010 (UTC)
The link should go to an archived version of the page unless it has simply been moved — Preceding unsigned comment added by 173.48.186.28 (talk) 15:39, 13 June 2014 (UTC)
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Is it true that beta-carotene is composed of two retinyl groups? It says nothing about that on the beta-carotene page. Can someone explain that to me, please. Juliansteinb (talk) 17:50, 24 February 2019 (UTC)
When I was a youth I learned Carotene will help with night vision. Is this right? Jokem (talk) 03:10, 18 March 2024 (UTC)
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