Activity of antioxidants in solution and in irradiated heterogeneous system
| Autor: | Dusan Razem, Branka Katusin-Razem |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1994 |
| Předmět: |
Antioxidant
General Chemical Engineering medicine.medical_treatment Radical Organic Chemistry antioxidant activity BHA BHT beta-carotene irradiated food model lipid peroxidation solid support alpha-tocopherol Lipid peroxidation chemistry.chemical_compound Oleic acid chemistry Oxidizing agent medicine Organic chemistry Butylated hydroxytoluene Butylated hydroxyanisole Egg white |
| Popis: | The efficiency of some common antioxidants, alpha-tocopherol, butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT), was studied relative to beta-carotene in a homogeneous solution and in a model system of an irradiated solid food. Relative reactivities in homogeneous solution covered a range of three orders of magnitude, alpha-tocopherol being the best and BHT the poorest antioxidant of the three. In irradiated systems consisting of oleic acid coated on a solid support (egg white), the range of reactivities was much narrower within one order of magnitude. In solution, there was a parallelism of the relative reactivities with oxidizing alkoxyl radicals derived from oleic acid hydroperoxides and tert-butyl hydroperoxide. On the solid support the relative reactivities of alpha-tocopherol and BHA with oleic acid radiation-induced oxidizing radicals were reversed, BHA appearing the best. Efficient antioxidants do not retain their great antioxidant activity in comparison with the moderate ones on transition from a homogeneous solution to a heterogeneous system. Relative efficiencies of antioxidants do not critically depend on the nature of oxidizing radicals in heterogeneous media. |
| Databáze: | OpenAIRE |
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