tragacanthinn.

1820 J. A. Paris Pharmacologia (ed. 4) 452 Dr. John has distinguished it by the name of Cerasin; but as Tragacanth consists almost entirely of this substance, the term Tragacanthin would be much more appropriate.

1843 Penny Cycl. XXV. 114/1 An artificial substance prepared by boiling starch,..called tragacantin.

1854 J. W. Draper Kane's Elements Chem. (Amer. ed.) xx. 530 Tragacanthine, or Vegetable Mucus, exists in cherry-tree gum mixed with arabine, but is purer in gum tragacanth, in flaxseed, and in quince-seed.

1913 F. L. Sargent Plants & their Uses v. 164 A similar substance yielding arabinose forms about half of gum tragacanth, about one-third of the gum being a carbohydrate called tragacanthin..which differs from arabin in being insoluble, although it absorbs water and swells exceedingly.

1931 A. G. Norman in Biochem. Jrnl. 25 200 It seems, strangely enough, that a name has never been given to this constituent of gum tragacanth soluble in water, and it is proposed to term it tragacanthin.

1993 Food Hydrocolloids 6 559 The methylated form, bassorin, is insoluble in water, swelling to form a gel, whereas the demethylated form, tragacanthin, is relatively soluble. Both forms are present in commercial tragacanth.

2006 Remington: Sci. & Pract. Pharmacy (ed. 21) lv. 1076/1 Tragacanthin yields glucuronic acids and arabinose when hydrolyzed.