| 释义 |
tanno- Chem.
Combining base of tann-ic, tann-in, used in forming names of tannin compounds, etc., and also in compound substantives, e.g. tannometer for tannin-meter. tannocaˈffeic tannocaffeic acid = caffetannic acid. ˈtannoform, C29H20O18, a product of gallotannic acid and formaldehyde; a reddish white, light powder, insoluble in water, but soluble in alkaline solutions. tannoˈgallate, tannoˈgallic a. = gallotannate, -tannic. tannoˈgelatin, a mixture of gelatin with a solution of tannin.
c1865in Circ. Sc. I. 351/1 *Tanno-caffeic acid, when roasted, develops the agreeable smell of coffee.
1899Allbutt's Syst. Med. VIII. 726 Powders of *tannoform, salicylic acid, talc, bismuth, or lycopodium may be employed.
1819Brande Chem. 394 The *tannogallate of iron is of the utmost importance, as forming the basis of writing ink, and of black dyes.
1836― Chem. (ed. 4) 928 Tannin forms a white precipitate in solution of gelatin (*tannogelatin), which, when carefully dried, becomes hard and tough.
1877Knight Dict. Mech., *Tannometer, a hydrometer for determining the proportion of tannin in tanning liquor. |