Quercitannic acid is one of the two forms of tannic acid[1] found in oak bark and leaves.[2] The other form is called gallotannic acid and is found in oak galls.
Quercitannic acid
Names
Other names
Quercitannin Oak bark tannin Quercotannic acid Querci-tannic acid Querco-tannic acid
The quercitannic acid molecule is also present in quercitron, a yellow dye obtained from the bark of the Eastern black oak (Quercus velutina), a forest tree indigenous in North America. It is described as a yellowish brown amorphous substance.[3]
In 1865 in the fifth volume of "A dictionary of chemistry", Henry Watts wrote :
It exhibits with ferricsalts the same reactions as gallotannic acid. It differs however from the latter in not being convertible into gallic acid, and not yielding pyrogallic acid by dry distillation. It is precipitated by sulfuric acid in red flocks. (Stenhouse, Ann. Ch. Pharm. xlv. 16.) According to Rochleder (ibid lxiii. 202), the tannic acid of black tea is the same as that of oak-bark.[5]
In 1880, Etti gave for it the molecular formula C17H16O9. He described it as an unstable substance, having a tendency to give off water to form anhydrides (called phlobaphenes), one of which is called oak-red (C34H30O17). For him, it was not a glycoside.[6][7]
In Allen’s "Commercial Organic Analysis", published in 1912, the formula given was C19H16O10.[8]
Other authors gave other molecular formulas like C28H26O15, while another formula found is C28H24O11.[9]
According to Lowe, two forms of the principle exist – one soluble in water, of the formula C28H28O14, and the other scarcely soluble, C28H24O12. Both are changed by the loss of water into oak red, C28H22O11.[10]
Quercitannic acid was for a time a standard used to assess the phenolic content in spices, given as quercitannic acid equivalent.[11]
Referencesedit
^L'Energie Homo-Hydrogne By Patricia Le Roux (French)
^Traité de chimie, Volume 2. Jöns Jakob Berzelius (friherre) and Olof Gustaf Öngren, A. Wahlen et Cie., 1838
^A dictionary of chemistry, Volume 5, by Henry Watts, 1865
^Über die Gerbsäure der Eichenrinde. C. Etti, Monatshefte für Chemie, Volume 1, Number 1, 262-278, 1880 doi:10.1007/BF01517069 (German)
^Zur Geschichte der Eichenrindegerbsäuren. C. Etti, Monatshefte für Chemie, Volume 4, Number 1, 512-530, 1883 doi:10.1007/BF01517990 (German)
^The nature of tea infusions. Henry L. Smith, The Lancet, Volume 181, Issue 4673, 22 March 1913, Page 846, doi:10.1016/S0140-6736(01)03766-7
^What are the historic and contemporary ethnobotanical uses of native Rhode Island wetlands plants? by Courtney Reckford, 1997
^A manual of organic materia medica and pharmacognosy - An introduction to the study of the vegetable Kingdom and the vegetable and animal drugs (Sayre's Materia Medica) fourth edition , by Lucius E Sayre
^Government standards for spices. Journal of the American Pharmaceutical Association, Volume 12, Issue 12, pages 1091–1094, December 1923, doi:10.1002/jps.3080121212
April 12, 2024
quercitannic, acid, forms, tannic, acid, found, bark, leaves, other, form, called, gallotannic, acid, found, galls, namesother, names, quercitanninoak, bark, tanninquercotannic, acidquerci, tannic, acidquerco, tannic, acididentifierspropertieschemical, formula. Quercitannic acid is one of the two forms of tannic acid 1 found in oak bark and leaves 2 The other form is called gallotannic acid and is found in oak galls Quercitannic acid NamesOther names QuercitanninOak bark tanninQuercotannic acidQuerci tannic acidQuerco tannic acidIdentifiersPropertiesChemical formula several see textAppearance yellowish brown amorphous substanceExcept where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa Infobox references The quercitannic acid molecule is also present in quercitron a yellow dye obtained from the bark of the Eastern black oak Quercus velutina a forest tree indigenous in North America It is described as a yellowish brown amorphous substance 3 In 1838 Jons Jacob Berzelius wrote that quercitannate is used to dissolve morphine 4 In 1865 in the fifth volume of A dictionary of chemistry Henry Watts wrote It exhibits with ferric salts the same reactions as gallotannic acid It differs however from the latter in not being convertible into gallic acid and not yielding pyrogallic acid by dry distillation It is precipitated by sulfuric acid in red flocks Stenhouse Ann Ch Pharm xlv 16 According to Rochleder ibid lxiii 202 the tannic acid of black tea is the same as that of oak bark 5 In 1880 Etti gave for it the molecular formula C17H16O9 He described it as an unstable substance having a tendency to give off water to form anhydrides called phlobaphenes one of which is called oak red C34H30O17 For him it was not a glycoside 6 7 In Allen s Commercial Organic Analysis published in 1912 the formula given was C19H16O10 8 Other authors gave other molecular formulas like C28H26O15 while another formula found is C28H24O11 9 According to Lowe two forms of the principle exist one soluble in water of the formula C28H28O14 and the other scarcely soluble C28H24O12 Both are changed by the loss of water into oak red C28H22O11 10 Quercitannic acid was for a time a standard used to assess the phenolic content in spices given as quercitannic acid equivalent 11 References edit L Energie Homo Hydrogne By Patricia Le Roux French Quercus on www henriettesherbal com Quercitannic on everything2 com Traite de chimie Volume 2 Jons Jakob Berzelius friherre and Olof Gustaf Ongren A Wahlen et Cie 1838 A dictionary of chemistry Volume 5 by Henry Watts 1865 Uber die Gerbsaure der Eichenrinde C Etti Monatshefte fur Chemie Volume 1 Number 1 262 278 1880 doi 10 1007 BF01517069 German Zur Geschichte der Eichenrindegerbsauren C Etti Monatshefte fur Chemie Volume 4 Number 1 512 530 1883 doi 10 1007 BF01517990 German The nature of tea infusions Henry L Smith The Lancet Volume 181 Issue 4673 22 March 1913 Page 846 doi 10 1016 S0140 6736 01 03766 7 What are the historic and contemporary ethnobotanical uses of native Rhode Island wetlands plants by Courtney Reckford 1997 A manual of organic materia medica and pharmacognosy An introduction to the study of the vegetable Kingdom and the vegetable and animal drugs Sayre s Materia Medica fourth edition by Lucius E Sayre Government standards for spices Journal of the American Pharmaceutical Association Volume 12 Issue 12 pages 1091 1094 December 1923 doi 10 1002 jps 3080121212 Retrieved from https en wikipedia org w index php title Quercitannic acid amp oldid 1139297688, wikipedia, wiki, book, books, library,
