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- W4321794958 abstract "Extract AOAC Official Method 960.53Drugs General Directions First Action 1960 Extraction with Lighter-Than-Water Solvents Perform preliminary steps directed in method prior to extraction. Extract aqueous solution in separator with specified volumes of solvent (ether, petroleum ether, etc.) by shaking ≥1 min. Let separate completely, swirl to remove H2O droplets, transfer lower aqueous layer to second separator, and decant solvent layer through pledget of solvent-washed cotton or glass wool in short-stem funnel inserted in neck of third separator. Wash mouth of separator with fine stream of solvent. Repeatedly shake aqueous solution with additional portions of solvents until substance sought is extracted, using second and first separators alternately for shaking, collecting solvents by filtering into third. If aqueous solution is to be further examined, dry cotton pledget in funnel by drawing air through stem, and wash with 5 mL H2O into main aqueous extract. Purified Diatomaceous (Siliceous) Earth for Partition Chromatography Celite® 545, acid-washed, or equivalent, is usually suitable for column chromatography. When interfering materials are present, purify as follows: Place pad of glass wool in base of chromatographic tube ≥100 mm diameter and add siliceous earth to height ca 5 times diameter. Add volume HCl equal to ca ⅓ volume of earth, and let percolate. Wash with methanol, using small volumes at first to rinse walls of tube, and then until washings are neutral to moistened indicator paper. Extrude into shallow dishes, heat on steam bath to remove methanol, and dry at 105°C until material is powdery and methanol-free. Store in tightly closed containers." @default.
- W4321794958 created "2023-02-25" @default.
- W4321794958 date "2023-01-04" @default.
- W4321794958 modified "2023-09-27" @default.
- W4321794958 title "General Methods" @default.
- W4321794958 doi "https://doi.org/10.1093/9780197610145.003.128" @default.
- W4321794958 hasPublicationYear "2023" @default.
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