Model Study of Different Antioxidant Properties of α‐ and γ‐Tocopherol in Fats
作者： T. Gottstein , W. Grosch
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摘要: A model study using 2,2,5,7,8-pentamethyl-6-hydroxychroman (α-COH) and 2,2,7,8-tetramethyl-6-hydroxychroman (γ-COH) as antioxidants, linoleic acid its methyl ester (both in bulk phase) the lipids was performed. After having demonstrated that antioxidative activities of substances did agree with those corresponding tocopherols (α-T, γ-T), stability α-COH γ-COH determined, products arising from α-COH, γ-COH, were identified. oxidize to different major (quinone, trimer) depending on reaction temperature (37°C 47°C) antioxidant concentration, whereas obtained by oxidation (diphenyl ether dimer, biphenyl dimer) not seem be affected differences conditions. It concluded γ-T superior α-T because it appears more stable and, also, being oxidized compounds which are still effective antioxidants. Modellversuche uber die unterschiedlichen antioxidativen Eigenschaften von α- und γ-Tocopherol Fetten Es wurden Modellversuche mit 2,2,5,7,8-Pentamethyl-6-hydroxychroman 2,2,7,8-Tetramethyl-6-hydroxychroman als Antioxidantien Linolsaure ihr Methylester Lipide durchgefuhrt. Nach dem Beweis, das der Modellsubstanzen denen entsprechenden Tocopherole γ-T) ubereinstimmen, wurde Stabilitat gemessen Produkte identifiziert, aus ihrem hervorgehen. Bei Erhohung Temperatur Antioxidanskonzentration ergab unterschiedliche Hauptprodukte (Chinon, Trimer), wahrend des (Diphenyletherdimer, Biphenyldimer) nicht durch Unterschiede den Reaktionsbedingungen beeinflust wurden. Es gefolgert, Antioxidans uberlegen ist, weil es stabiler ist zu Produkten oxidiert wird, noch antioxidativ wirksam sind.
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