Kinotannic acid

Kinotannic acid
Names
Other names
Coccotannic acid
kino-tannic acid
Identifiers
Properties
Chemical formula
 C18H18O8[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Chemical compound

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.[2] It is closely related to the tannin from catechu; its non-glucosidal nature was established by Bergholz.[3][4]

Properties

When dry distilled it yields pyrocatechine and protocatechinic acid.[5]

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

Kinotannic acid is degraded by oxidation when exposed to air.

References

  1. ^ Pterocarpi Lignum - Red Sandal Wood. -The Wood Of Pterocarpus Santalinus. From Ceylon on chestofbooks.com
  2. ^ Pterocarpus on www.henriettes-herb.com
  3. ^ Dissert. Dorpat, 1884
  4. ^ Kino (U. S. P.)—Kino. on www.henriettes-herb.com
  5. ^ Holdsworth, David; Gideon, Osia; Pilokos, Bospidik (January 1989). "Traditional Medicine of New Ireland, Papua New Guinea Part III Konos, Central New Ireland". International Journal of Crude Drug Research. 27 (1): 55–61. doi:10.3109/13880208909053938.
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Types of hydrolysable tannins
Carbohydrates
  • Glucose
  • Quinic acid
  • Shikimic acid
Phenolic
gallic acid | Ellagic acid | Vanillic acid
Types
  • Ellagitannins
  • Gallotannins
unclassified
  • 1,2-di-O-galloyl-3-O-digalloyl-4,6-O-(S)-hexa- hydroxydiphenoy-β-D-glucose
  • 2,3-(S)-Hexahydroxydiphenoyl-D-glucose
  • Alienanin B
  • Alunusnin A
  • Aromatinin A
  • Balanophotannin D, E, F and G
  • Burkinabin A, B and C
  • Castavaloninic acid
  • Cinchotannic acid
  • Cocciferin D2
  • Emblicanins (Emblicanin A and Emblicanin B)
  • Euprostin A
  • Flavogallonic acid
  • Flavogallonic acid dilactone
  • Heterophylliin D
  • Helioscopin A (1,6-(S)-hexahydroxydiphenoyl-2,4-(R)-elaeocarpusinoyl-3-O-galloyl-β-D-glucose)
  • Helioscopin B (1,3,6-tri-O-galloyl-2,4-(R)-elaeocarpusinoyl-β-D-glucose)
  • Helioscopinin A (1,6-(S)-hexahydroxydiphenoyl-2,4-(S)-dehydrohexahydroxydiphenoyl-3-O-galloyl-β-D-glucose)
  • Helioscopinin B (1,6-(S)-hexahydroxydiphenoyl-3-O-galloyl-β-D-glucose)
  • Hipophaenin D
  • Isostrictinin
  • Kinotannic acid
  • Platycaryanin A
  • Rugosin C, D and F
  • Squarrosanin A
  • Strictinin
  • Syzyginin A
  • Tannic acid
  • Tellimagrandin I
  • Tercatin
  • Tergallagin
  • Vescalin
  • Vescavaloneic acid/Castavaloneic acid
Other


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