113348-75-7Relevant articles and documents
Photolysis of α-Tocopherol in Olive Oils and Model Systems
Pirisi, Filippo M.,Angioni, Alberto,Bandino, Giovanni,Cabras, Paolo,Guillou, Claude,Maccioni, Elisabetta,Reniero, Fabiano
, p. 4529 - 4533 (1998)
The photolysis of α-tocopherol (I) in olive oil (O) and in some model systems (n-hexane = H; anhydrous n-hexane = HA, and triolein = T) was studied under sunlight and under artificial light (λ > 290 nm) by HPLC and GC/MS. In O and T, I disappeared linearly to 50% of the starting concentration, reached a constant value, and finally disappeared rapidly from the medium. In the model system, photolysis followed a pseudo-first-order kinetics. Although no peaks attributable to photoproducts were found in O, a main product identified by 1H and 13C NMR and GC/MS as 5-formyltocopherol (II) was found in the model systems. Irradiation of compound II led to species undetectable by HPLC in agreement with a slower consecutive kinetic process than that of I. In the HA and T systems, the formation of II occurred at lower levels than in H. The possible behavior of photodegradation is discussed.
Copper(II)-catalyzed oxidation of d-α-tocopherol by oxygen in aqueous solution
Nagata, Yoshiko,Miyamoto, Chie,Matsushima, Yoshikazu,Matsumoto, Shigenobu
, p. 71 - 76 (2000)
α-Tocopherol (α-Toc) was solubilized in aqueous solutions using 13 solubilizing agents and the products of oxidation by oxygen in the presence and the absence of Cu(II) were analyzed by HPLC. In the presence of Cu(II), the oxidation was accelerated and 5-
