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The COOH group has a pKa of 4.5, and the phenolic OHs have pKa of 10.
this is wrong a priori, you cannot deprotonate all three phenols at once. I don't know which one deprotonates first so i'm not changing it but my guess is on meta. 24.181.29.106
I don't know how to add a citation to this page, but a synthesis of Mescaline from Gallic acid can be found here :
[1] A New Synthesis of Mescaline, Makepeace U. Tsao, J. Am. Chem. Soc. 5495-5496 (1951) —Preceding unsigned comment added by 212.238.246.56 ( talk) 11:35, 9 August 2008 (UTC)
Early photographers, including Joseph Bancroft Reade (1801–1870) and William Fox Talbot (1800–1877), used gallic acid for developing latent images in calotypes. It has also been used as a coating agent in zincography.
Claims made on behalf of Joseph Bancroft Reade (1801–1870) were shown by RD Wood to be erroneous he was working with Silver Nitrate; only AgNo3, AgBr, AgI, and theoretically AgF [ie silver chloride/bromide/iodide] have the potential to develop the latent negative image.[See British Journal of Photography, 28 July 1972, Volume 119, No. 5845, pp.644–646, 643] — Preceding unsigned comment added by Michael W Gray ( talk • contribs) 14:11, 23 October 2013 (UTC)
This article talk page was automatically added with {{ WikiProject Food and drink}} banner as it falls under Category:Food or one of its subcategories. If you find this addition an error, Kindly undo the changes and update the inappropriate categories if needed. The bot was instructed to tagg these articles upon consenus from WikiProject Food and drink. You can find the related request for tagging here . Maximum and careful attention was done to avoid any wrongly tagging any categories , but mistakes may happen... If you have concerns , please inform on the project talk page -- TinucherianBot ( talk) 06:45, 4 July 2008 (UTC)
do you think, phytochemicals.info is a site worth a citation??? esp. because half the article is a citation from there -hig- —Preceding unsigned comment added by 77.132.208.48 ( talk) 23:12, 25 April 2009 (UTC)
As I am a German Wikipedia user, I read in the German article that the pKa (or pKs as it is called in german) is not 4.5 but 3.13 wich seems correct according to the literature (e.g. Bykova L.N., Petrov S.I.& Blagodatskava Z.G. (1970). Relative acidity of phenol and its derivatives in a medium of nonaqueous solvents. Zh. Obshch. Khim., 40, 2295-3000. and the citation No 3 from the german article). I also think that a higher acidity could be expected than for benzoic acid. This thought also fits following german article (you SHOULD translate that one too, if possible) http://de.wikipedia.org/wiki/Hydroxybenzoes%C3%A4uren (Hydroxybenzoesäuren). — Preceding unsigned comment added by 134.130.112.64 ( talk) 20:04, 2 November 2011 (UTC)
That George Washington's spies used gallic acid as an invisible ink is supposedly mentioned in "Episode 2: Revolution" of the series "America: The Story of Us", which was broadcast by the U.S. cable TV channel, the "History Channel".
However, in "Chapter 4: 711 and the Sympathetic Stain" (pages 101-124) of his book Washington's Spies: The story of America's first spy ring (New York, New York: Bantam, 2006), author Alexander Rose states that one of Washington's spies, Abraham Woodhull, used an invisible ink when he wrote to George Washington, who then used a developing solution to read the writing. However, Rose states that the nature of the invisible ink and the developing solution are unknown -- although Rose speculates that the invisible ink was gallic acid and that the developing solution was iron sulfate.
So I think that this claim -- that Washington's spies used gallic acid -- should either be deleted or tagged as "dubious". Cwkmail ( talk) 01:13, 5 August 2012 (UTC)
Done
Tomásdearg92 (
talk)
23:22, 2 November 2016 (UTC)
The site " http://www.phytochemicals.info/phytochemicals/gallic-acid.php' reads:
"Gallic acid seems to have anti-fungal and anti-viral properties. Gallic acid acts as a antioxidant and helps to protect our cells against oxidative damage. Gallic acid was found to show cytotoxicity against cancer cells, without harming healthy cells. Gallic acid is used a remote astringent in cases of internal haemorrhage. Gallic acid is also used to treat albuminuria and diabetes. Some ointment to treat psoriasis and external haemorrhoids contain gallic acid."
The wikipedia article reads:
Gallic acid seems to have anti-fungal and anti-viral properties. Gallic acid acts as an antioxidant and helps to protect human cells against oxidative damage. Gallic acid was found to show cytotoxicity against cancer cells, without harming healthy cells. Gallic acid is used as a remote astringent in cases of internal haemorrhage. Gallic acid is also used to treat albuminuria and diabetes. Some ointments to treat psoriasis and external haemorrhoids contain gallic acid.
[i.e., without quotation marks to indicate that the content was lifted in entirety from another source].
This is plagiarized content, even with citation, and is wholely unacceptable. Please correct immediately. LeProf — Preceding unsigned comment added by 71.201.123.248 ( talk) 20:22, 3 March 2013 (UTC)
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Please add info on this paper to the article to section "Research". It's currently included in 2020 in science like so:
Scientists report that gut microbiomes that produce high levels of gallic acid and gallic acid itself, which can be found in many antioxidant-rich foods considered healthy and earlier reported to induce cell death in prostate and breast cancer cells, can switch mutated p53 proteins from being tumour-suppressive to accelerate the growth of bowel cancers in mice. [1] [2]
I already added this, mostly as is, to the section but it was reverted by User:Zefr with the following rationale: Reverting good faith edits; content is misleading and source is not a reliable medical reference; see WP:MEDRS.
Please answer these 4 questions, thank you. -- Prototyperspective ( talk) 15:04, 1 September 2020 (UTC)
Scientists report that gut microbiomes that produce high levels of gallic acid and gallic acid itself can switch mutated p53 proteins from being tumour-suppressive to accelerate the growth of bowel cancers in mice. [3] [4]
References
Does this compound contain the benzene ring? 173.88.246.138 ( talk) 22:58, 3 October 2021 (UTC)
Is this compound contained in buckwheat? 173.88.246.138 ( talk) 22:59, 3 October 2021 (UTC)
Shouldn't the term " polyphenol" be mentioned at least once in the text of this article? 173.88.246.138 ( talk) 22:59, 3 October 2021 (UTC)
![]() | This article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||
|
![]() | It is requested that a photograph be
included in this article to
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The external tool WordPress Openverse may be able to locate suitable images on Flickr and other web sites. |
The COOH group has a pKa of 4.5, and the phenolic OHs have pKa of 10.
this is wrong a priori, you cannot deprotonate all three phenols at once. I don't know which one deprotonates first so i'm not changing it but my guess is on meta. 24.181.29.106
I don't know how to add a citation to this page, but a synthesis of Mescaline from Gallic acid can be found here :
[1] A New Synthesis of Mescaline, Makepeace U. Tsao, J. Am. Chem. Soc. 5495-5496 (1951) —Preceding unsigned comment added by 212.238.246.56 ( talk) 11:35, 9 August 2008 (UTC)
Early photographers, including Joseph Bancroft Reade (1801–1870) and William Fox Talbot (1800–1877), used gallic acid for developing latent images in calotypes. It has also been used as a coating agent in zincography.
Claims made on behalf of Joseph Bancroft Reade (1801–1870) were shown by RD Wood to be erroneous he was working with Silver Nitrate; only AgNo3, AgBr, AgI, and theoretically AgF [ie silver chloride/bromide/iodide] have the potential to develop the latent negative image.[See British Journal of Photography, 28 July 1972, Volume 119, No. 5845, pp.644–646, 643] — Preceding unsigned comment added by Michael W Gray ( talk • contribs) 14:11, 23 October 2013 (UTC)
This article talk page was automatically added with {{ WikiProject Food and drink}} banner as it falls under Category:Food or one of its subcategories. If you find this addition an error, Kindly undo the changes and update the inappropriate categories if needed. The bot was instructed to tagg these articles upon consenus from WikiProject Food and drink. You can find the related request for tagging here . Maximum and careful attention was done to avoid any wrongly tagging any categories , but mistakes may happen... If you have concerns , please inform on the project talk page -- TinucherianBot ( talk) 06:45, 4 July 2008 (UTC)
do you think, phytochemicals.info is a site worth a citation??? esp. because half the article is a citation from there -hig- —Preceding unsigned comment added by 77.132.208.48 ( talk) 23:12, 25 April 2009 (UTC)
As I am a German Wikipedia user, I read in the German article that the pKa (or pKs as it is called in german) is not 4.5 but 3.13 wich seems correct according to the literature (e.g. Bykova L.N., Petrov S.I.& Blagodatskava Z.G. (1970). Relative acidity of phenol and its derivatives in a medium of nonaqueous solvents. Zh. Obshch. Khim., 40, 2295-3000. and the citation No 3 from the german article). I also think that a higher acidity could be expected than for benzoic acid. This thought also fits following german article (you SHOULD translate that one too, if possible) http://de.wikipedia.org/wiki/Hydroxybenzoes%C3%A4uren (Hydroxybenzoesäuren). — Preceding unsigned comment added by 134.130.112.64 ( talk) 20:04, 2 November 2011 (UTC)
That George Washington's spies used gallic acid as an invisible ink is supposedly mentioned in "Episode 2: Revolution" of the series "America: The Story of Us", which was broadcast by the U.S. cable TV channel, the "History Channel".
However, in "Chapter 4: 711 and the Sympathetic Stain" (pages 101-124) of his book Washington's Spies: The story of America's first spy ring (New York, New York: Bantam, 2006), author Alexander Rose states that one of Washington's spies, Abraham Woodhull, used an invisible ink when he wrote to George Washington, who then used a developing solution to read the writing. However, Rose states that the nature of the invisible ink and the developing solution are unknown -- although Rose speculates that the invisible ink was gallic acid and that the developing solution was iron sulfate.
So I think that this claim -- that Washington's spies used gallic acid -- should either be deleted or tagged as "dubious". Cwkmail ( talk) 01:13, 5 August 2012 (UTC)
Done
Tomásdearg92 (
talk)
23:22, 2 November 2016 (UTC)
The site " http://www.phytochemicals.info/phytochemicals/gallic-acid.php' reads:
"Gallic acid seems to have anti-fungal and anti-viral properties. Gallic acid acts as a antioxidant and helps to protect our cells against oxidative damage. Gallic acid was found to show cytotoxicity against cancer cells, without harming healthy cells. Gallic acid is used a remote astringent in cases of internal haemorrhage. Gallic acid is also used to treat albuminuria and diabetes. Some ointment to treat psoriasis and external haemorrhoids contain gallic acid."
The wikipedia article reads:
Gallic acid seems to have anti-fungal and anti-viral properties. Gallic acid acts as an antioxidant and helps to protect human cells against oxidative damage. Gallic acid was found to show cytotoxicity against cancer cells, without harming healthy cells. Gallic acid is used as a remote astringent in cases of internal haemorrhage. Gallic acid is also used to treat albuminuria and diabetes. Some ointments to treat psoriasis and external haemorrhoids contain gallic acid.
[i.e., without quotation marks to indicate that the content was lifted in entirety from another source].
This is plagiarized content, even with citation, and is wholely unacceptable. Please correct immediately. LeProf — Preceding unsigned comment added by 71.201.123.248 ( talk) 20:22, 3 March 2013 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Gallic acid. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
An editor has reviewed this edit and fixed any errors that were found.
Cheers.— InternetArchiveBot ( Report bug) 12:33, 7 January 2017 (UTC)
Hello fellow Wikipedians,
I have just modified 2 external links on Gallic acid. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
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Cheers.— InternetArchiveBot ( Report bug) 11:12, 10 October 2017 (UTC)
Please add info on this paper to the article to section "Research". It's currently included in 2020 in science like so:
Scientists report that gut microbiomes that produce high levels of gallic acid and gallic acid itself, which can be found in many antioxidant-rich foods considered healthy and earlier reported to induce cell death in prostate and breast cancer cells, can switch mutated p53 proteins from being tumour-suppressive to accelerate the growth of bowel cancers in mice. [1] [2]
I already added this, mostly as is, to the section but it was reverted by User:Zefr with the following rationale: Reverting good faith edits; content is misleading and source is not a reliable medical reference; see WP:MEDRS.
Please answer these 4 questions, thank you. -- Prototyperspective ( talk) 15:04, 1 September 2020 (UTC)
Scientists report that gut microbiomes that produce high levels of gallic acid and gallic acid itself can switch mutated p53 proteins from being tumour-suppressive to accelerate the growth of bowel cancers in mice. [3] [4]
References
Does this compound contain the benzene ring? 173.88.246.138 ( talk) 22:58, 3 October 2021 (UTC)
Is this compound contained in buckwheat? 173.88.246.138 ( talk) 22:59, 3 October 2021 (UTC)
Shouldn't the term " polyphenol" be mentioned at least once in the text of this article? 173.88.246.138 ( talk) 22:59, 3 October 2021 (UTC)