Some Microchemical Tests for Alkaloids (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. 1921 edition. Excerpt: ...solutions and polarize brightly (Plate XIX, Fig. 5) (16). ZINC-cHLOR-IoDIDE.--Amorphous precipitates are heavy and numbers of crystals are formed quickly, especially in the 1: 1000 solution if stirred. The crystals are needles or rods usually pointed and often in rosettes. PALLADoUs CHLORIDE.----No precipitate appears in the 1: 1000 solution. Numbers of rosettes are formed in the 1:500 solution. They are composed of sharp-pointed needles resembling thorns. In the 1:200 solution we have large crystals in two forms, needles in rosettes and rosettes of plates. In the 1: 50 solution we get a dense mass of needle-shaped crystals. Rosettes of plates are not so common (Plate VI, Fig. 5). PLATINUM CHLoRIDE.--Crystals form only on stirring in the 1: 1000 and 1:500 solutions, and they are rosettes of rods, as a rule. The dense precipitates in the other two solutions crystallize quickly into large, bushy crystals (Plate IV, Fig. 6). MAYER S REAGENT.--The precipitates are all heavy with this reagent and crystals are formed only on stirring. They are very small in all except the 1: 1000 solution, and in this solution they are often good-sized rosettes of rods. MARME S REAGENT.--Amorphous precipitates appear which crystallize without stirring in all solutions. A dense mass of crystals are obtained in the two more concentrated solutions. The crystals in the 1: 1000 solution are large and polarize highly. They normally have cross arms and jagged edges. AMMONIUM MOLYnDATE.--Heavy, amorphous precipitates and great numbers of small needle-shaped crystals are formed in all the solutions. HYOSCYAMINE HYDBOBROMIDE An alkaloidal salt labeled Daturine Sulfate gave same results as the one labeled hyoscyamine hydrobromide, and the...