The Botanical Gazette Volume 64 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...1914--15; Jour. Genetics 4:367. 1914-15. IWHE1.1A1.1-:, M., Jour. Genetics 4:109, 369. 1914-15. " TRUTTWIN, HANS, Chem. Zeit. 40:478. 1916. " WEST, CLARENCE J., Register of Phi Lambda Upsilon 6: 1-18. 1917. I3W1L1.ST11iTT1: R, R., and l/IALLISON, H., Sitz. Ber. Akad. Wiss. 12:769. 1914. '4 W1LLST2iTrER, R., and ZEcH.'.1E1STER, L., Sitz. Ber. Akad. Wiss. 12:886. 1914. 5 SHIBATA, K., SHIB.-TA, Y., and KASIWAG1, I., Jour. Pharrn. Soc. Japan no. 417. 1916; Chem. Abstr. 11:578. 1917. The amyl alcohol test for anthocyans has played an important part in the course of WILLSTKTTER S work. The anthocyan (glucoside) remains quantitatively in dilute (2 N) sulphuric acid when shaken with amyl alcohol, whereas the anthocyanidin (non-glucoside) passes quantitatively into the alcoholic layer, yielding a red solution. When shaken with a solution of sodium acetate the red color becomes violet or violet red, the pigment remaining quantitatively in the amyl alcohol. On shaking with sodium carbonate, the alcohol solution turns blue or bluish-green, and at the same time the pigment descends quantitatively into the aqueous layer. This is true only for diglucosides. Monoglucosides yield a certain amount of the pigment to the amyl alcohol. Rhamnose glucosides (containing one molecule each of rhamnose and glucose) behave like the monoglucosides. From this it is seen that the test may be used to distinguish nomo-and rhamnoseglucosides from diglucosides. The test is also of service in testing the individuality of anthocyan. For this the acid used must be of sufficient concentration to prevent the conversion of the colored chloride into the colorless carbinol (#1 base) and yet must be dilute enough to dissolve the chloride readily (0. 5 per cent...