After cooling in water, sodium chloride and dichloromethane containing internal standard were added. The sample was shaken and centrifuged. 2,5-Hexanedione concentration in an aliquot of dichloromethane extract was quantified by gas chromatography using a widebore column (DB-1701). Urinary concentration...
Practically insoluble in water; miscible with alcohol, with dichloromethane, and with pe- troleum spirit (40° to 60°). Protect from light. USNF 26 (Ethyl Oleate). It consists of esters of ethyl alcohol and high-molecular-weight fatty acids, principally oleic acid. A mobile, practically ...
Are water and ethyl alcohol miscible or immiscible? Explain. Explain why the boiling points of the components of a mixture should differ by at least 40 degrees Celsius in order to get an effective separation by simple distillation. Explain how you would prepare a 1.135 m solution of KBr in...
When formulated as a ointment, the active ingredients will typically be combined with either a paraffinic or a water-miscible ointment base. Alternatively, the active ingredients may be formulated in a cream with, for example an oil-in-water cream base. Such transdermal formulations are well-...
Dichloromethane/ Toluene method 3 Alumina/water 0.10 0.09 <0.05 0.06 0.20 99.70 miscible solvent All the impurities, which were present in impure Lovastatin (I), after the process of fermentation and lactonisation have been substantially removed below specified pharmacopoeial limits by a purification ...