The determination of small amounts of organic hydroperoxides in the presence of hindered amine light stabilizers and their nitroxyls |
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| Institution: | 1. Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, Scotland, UK;2. GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, SG1 2NY, UK;1. Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA;2. Department of Emergency Medicine, University of Michigan, Ann Arbor, MI 48109, USA;3. Michigan Center for Integrative Research in Critical Care, University of Michigan, Ann Arbor, MI 48109, USA;1. Faculdade de Ciências e Tecnologia, UNESP – Univ. Estadual Paulista, CEP 19060-900 Presidente Prudente, SP, Brazil;2. Instituto de Química, Universidade Federal de Uberlândia, P.O. Box 593, Uberlândia 38400-089, Minas Gerais, Brazil;1. Department of Restorative Dentistry, Rutgers School of Dental Medicine, Newark, NJ 07103, United States;2. Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology (SCTIMST), Thiruvananthapuram, India |
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| Abstract: | A method for the quantitative determination of hydroperoxide (ROOH) in the presence of hindered amine light stabilizers (HALS) and/or their nitroxyl free radical derivatives has been elaborated. The method is based on the quantitative reduction of hydroperoxides by triphenyl phosphine. The resulting compounds (alcohols) are then determined by GLC using the internal standard technique. The method has been tested on the hydroperoxides derived from 2,4-dimethylpentane. Its sensitivity and reproducibility appear to be comparable with other methods for ROOH determination but, unlike the latter, it has the advantage that its results are not influenced by the presence of HALS and/or their nitroxyl radical derivatives in the analyzed medium. |
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