Scientific and applied pharmacognosy intended for the use of students in pharmacy, as a hand book for pharmacists, and as a reference book for food and drug analysts and pharmacologists . 4 H?^ f^n v\s. Fig. 36.—Crystals from exudations and extracts; A, crystals found in the residueafter treatment of catechu with water; B, long prisms of catechin (d) foundon treatment of gambir with a solution of hydrated chloral, the crystals soondissolving, and prismatic plates (e) usually seen in glycerin mounts of gam-bir; C, crystals from aloes, including aloin (a), broad prisms (6) from Bar-badoes aloes,
Scientific and applied pharmacognosy intended for the use of students in pharmacy, as a hand book for pharmacists, and as a reference book for food and drug analysts and pharmacologists . 4 H?^ f^n v\s. Fig. 36.—Crystals from exudations and extracts; A, crystals found in the residueafter treatment of catechu with water; B, long prisms of catechin (d) foundon treatment of gambir with a solution of hydrated chloral, the crystals soondissolving, and prismatic plates (e) usually seen in glycerin mounts of gam-bir; C, crystals from aloes, including aloin (a), broad prisms (6) from Bar-badoes aloes, and plates (c) from Cape aloes; D, crystals of benzoic acidobtained by subliming benzoin on a slide or in a watch crystal. or with Klunges reagent a deep-red color. These color reactions aredue to the presence of about per cent of an isomeric body (iso-barbaloin), which is not found in the aloins of Socotrine and Capealoes. Alcoholic solutions of barbaloin and isobarbaloin lose their ALOES 93 bitterness on standing, the aloin being replaced in part at least by asugar aloinose, which forms yellow crystals that are colored red andthen green with concentrated hydrochloric acid and orcin. Alo
Size: 1773px × 1409px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
