Kinotannic acid explained

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.^[1] It is closely related to the tannin from catechu; its non-glucosidal nature was established by Bergholz.^{[2] [3]}

Properties

When dry distilled it yields pyrocatechine and protocatechinic acid.^[4]

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

Kinotannic acid is degraded by oxidation when exposed to air.

Notes and References

1. http://www.henriettes-herb.com/eclectic/bpc1911/pterocarpus.html Pterocarpus on www.henriettes-herb.com
2. Dissert. Dorpat, 1884
3. http://www.henriettes-herb.com/eclectic/kings/pterocarpus-mars.html Kino (U. S. P.)—Kino. on www.henriettes-herb.com
4. Holdsworth . David . Gideon . Osia . Pilokos . Bospidik . Traditional Medicine of New Ireland, Papua New Guinea Part III Konos, Central New Ireland . International Journal of Crude Drug Research . January 1989 . 27 . 1 . 55–61 . 10.3109/13880208909053938.