title: Determination of iodine values using 1,3-dibromo-5,5-dimethylhydantoin (DBH) without the employment of chlorinated hydrocarbons. Analytical methods of pharmacopoeias with DBH in respect to environmental and economical concern. Part 17.
abstract: Low and medium iodine values of fixed oils and fats can be determined in glacial acetic acid within reduced waiting times of only 5 min. Highly unsaturated compounds such as those of linseed oil, cod-liver oil, sunflower oil, soybean oil, wheat germ oil and the emulsifier sorbitan trioleate result too low values in comparison to PH. EUR. 2002 [2] and USP 2000 [3]. Cocoa butter with a low iodine number is insoluble in glacial acetic acid. The iodine values of nonionogenic emulsifiers such as ceteareth-30 (Macrogol cetostearyl ether PH. EUR. 2002), oleth-10 resp. 20 (Macrogol oleyl ether PH. EUR. 2002) and polysorbate-80 PH. EUR. 2002 are obtained in aqueous solutions. Oleth-2 (Macrogol oleyl ether PH. EUR. 2002), polyoxyl-40 castor oil (Macrolglycerol ricinoleate PH. EUR. 2002), polysorbate-60 PH. EUR. 2002 and sorbitan trioleate PH. EUR. 2002 need the addition of ethyl acetate. Fixed oils even with high iodine values can be determined in an o/w emulsion with a reaction time of 5 min in most cases, when nonionogenic emulsifiers such as ceteareth-30, polyoxyl-30 glycerol monolaurate or polyoxyl-60 hydrogenated castor oil (Macrolglycerol hydroxystearate PH. EUR. 2002) are used.
authors.affiliation: Institut für Pharmazeutische Chemie, Philipps-Universität, Marburg, Germany. Hilp@mailar.uni-marburg.de
authors.forename: M
authors.initials: M
authors.lastname: Hilp
mesh_terms: D000085:Acetates / Q000737:chemistry; D004655:Emulsions; D004787:Environmental Pollution / Q000517:prevention & control; D005060:Europe; D006827:Hydantoins / Q000737:chemistry* / Q000191:economics; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry; D007202:Indicators and Reagents; D007455:Iodine / Q000032:analysis*; D009821:Oils / Q000032:analysis; D010602:Pharmacopoeias as Topic; D011199:Potentiometry; D012997:Solvents; D013501:Surface-Active Agents
chemical_list: D000085:Acetates; D004655:Emulsions; D006827:Hydantoins; D006843:Hydrocarbons, Chlorinated; D007202:Indicators and Reagents; D009821:Oils; D012997:Solvents; D013501:Surface-Active Agents; D007455:Iodine; C056578:1,3-dibromo-5,5-dimethylhydantoin