Kinotannic acid

{{chembox | verifiedrevid = 428857843 | Name = Kinotannic acid | ImageFile = | ImageSize = 200px | ImageName = Chemical structure of kinotannic acid | ImageAlt = Chemical structure of kinotannic acid | IUPACName = | OtherNames = Coccotannic acid kino-tannic acid |Section1={{Chembox Identifiers | CASNo = | CASNo_Ref = | CASNoOther = | PubChem = | SMILES = | InChI = | MeSHName = }} |Section2={{Chembox Properties | Formula = C18H18O8<ref>[http://chestofbooks.com/health/materia-medica-drugs/National-Treatment-Disease/Pterocarpi-Lignum-Red-Sandal-Wood-The-Wood-Of-Pterocarpu.html Pterocarpi Lignum - Red Sandal Wood. -The Wood Of Pterocarpus Santalinus. From Ceylon on chestofbooks.com]</ref> | MolarMass =  | Appearance = | Density = | MeltingPt = | BoilingPt = | Solubility = }} }} '''Kinotannic acid''' is the chief constituent of the kino gum, of which it contains 70 to 80 per cent. Kino also contains kino red, a phlobaphene produced from kinotannic acid by oxidation.<ref>[http://www.henriettes-herb.com/eclectic/bpc1911/pterocarpus.html ''Pterocarpus'' on www.henriettes-herb.com]</ref> It is closely related to the tannin from catechu; its non-glucosidal nature was established by Bergholz.<ref>Dissert. Dorpat, 1884</ref><ref>[http://www.henriettes-herb.com/eclectic/kings/pterocarpus-mars.html Kino (U. S. P.)—Kino. on www.henriettes-herb.com]</ref>

==Properties== When dry distilled it yields pyrocatechine and protocatechinic acid.<ref>{{cite journal |last1=Holdsworth |first1=David |last2=Gideon |first2=Osia |last3=Pilokos |first3=Bospidik |title=Traditional Medicine of New Ireland, Papua New Guinea Part III Konos, Central New Ireland |journal=International Journal of Crude Drug Research |date=January 1989 |volume=27 |issue=1 |pages=55–61 |doi=10.3109/13880208909053938}}</ref>

It is soluble in water. Solutions are precipitated by lead or copper salts.

Kinotannic acid is degraded by oxidation when exposed to air. ==References== {{reflist}}

Category:Tannins