Oxidation of 4-Isopropylphenol in Aqueous Solutions as a Model for Oxidation of Flavonoids to Form Dimers
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One of the main chemical properties of natural flavonoids is their ability for facile oxidation in aqueous solutions, including by dissolved atmospheric oxygen, which explains their high antioxidant activity [1, 2, 3]. Formation of dimers, trimers, and more complicated oligomers of often undetermined structures is the most interesting feature of the flavonoid oxidation-product composition even at low concentrations in aqueous solutions. The formation mechanisms are still the subjects of discussion [4, 5, 6, 7, 8].
The goal of the present work was to model flavonoid oxidation using a simpler compound (4-isopropylphenol) as an example. This would allow the formation of their dimeric oxidation products to be explained.
One conversion pathway for free-radical intermediates from flavonoid oxidation is the formation of quinone and quinone methide intermediates. Quinone methides are described most extensively in lignin chemistry . Their most characteristic chemical property, like quinones...
We thank the management of FGUP NII GPECh FMBA of Russia (St. Petersburg) for the opportunity to use the equipment required for the present work.
- 1.T. J. Mabry, K. R. Markham, and M. B. Thomas, The Systematic Identification of Flavonoids, Springer–Verlag, New York, 1970, 354 pp.Google Scholar
- 3.I. G. Zenkevich and T. I. Pushkareva, Zh. Anal. Khim., 72 (10), 890 (2017).Google Scholar
- 11.R. Gulaborski, I. Bogeski, V. Mirceski, S. Saul, B. Pasieka, H. H. Haeri, M. Stefova, J. P. Stanoeva, S. Mitrev, M. Hoth, and R. Kappl, Sci. Rep., 3, Art. No. 1865 (2013).Google Scholar
- 13.W. Lohmann, A. Baumann, and U. Karst, LC·GC Eur., No. 1, 7 (2010).Google Scholar