A quantum chemical study on the reactivity of four licorice flavonoids scavenging ·OOCl3C
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Isoliquiritigenin, liquiritigen, uralenol, and neouralenol are four natural licorice flavonoid compounds extracted from licorice, which have the ability of scavenging free radicals. In this paper, the density functional theory (DFT) was used to study the microscopic reaction mechanism of the four kinds of licorice flavonoids respectively scavenging ·OOCl3C in vivo. At the level of M06-2X/6-311+G(d,p), the geometries of all stationary points for hydrogen atom transfer (HAT) and radical adduct formation (RAF) pathways were optimized. The thermodynamic parameters and kinetic parameters of each reaction pathway were obtained, and the potential energy surface information of each reaction pathway was obtained too. Using the continuum solvation model based on solute electron density (SMD), the influence of the solvation effect on the reaction was calculated. The main mechanisms and reactive sites for the capture of ·OOCl3C by four licorice flavonoids, liquiritigen, isoliquiritigenin, uralenol, and neouralenol, were determined. Research indicates liquiritigen captures ·OOCl3C by HAT mechanism. The HAT pathway on the B′ ring of liquiritigen is the main reactive site. Isoliquiritigenin captures ·OOCl3C in the body through HAT and RAF mechanism. The RAF pathway is the dominant reaction pathway. The C1 site on the carbon–carbon double bond linking the two benzene rings is the main reactive site. Uralenol and neouralenol capture ·OOCl3C by HAT mechanism. The main reactive site of uralenol is B6 site, and the main reactive site of neouralenol is B′ 2 site. By this study, the potential energy surface information difficult to capture by experimental research is obtained, which provides a reliable theoretical basis for the further screening of highly active natural free radical scavengers of flavonoids in licorice and provides the support for the improvement of the development and application technology of licorice.
KeywordsLicorice flavonoids Radical Potential energy surface Quantum chemical
We thank the grid computing server provided by the Chinese Academy of Sciences.
This work is supported by the National Basic Research Program of China (2012CB723308), the National Natural Science Foundation of China (51337002 and 50977019), the Doctoral Foundation by the Ministry of Education of China (20112303110005), and the Science Foundation for Distinguished Young Scholar of Heilongjiang Province (JC201206).
Compliance with ethical standards
The authors declare that they have no competing interests.
- 3.Connor HD, Therman RG, Galiza MD, Mason RP (1986) The formation of a novel free radical metabolite from CCl4 in the perfused rat liver in vivo[J]. J Biol Chem 261:4542–4548Google Scholar
- 4.Linton A, Goebl M, Fagan NK (1985) Free radical one-electron versus hydroxyl radical-induced oxidation. Reaction of trichoromethylperoxyl radicals with simple and substituted aliphatic sulphides in aqueous solution[J]. Cheminform 16:647–651Google Scholar
- 6.Zhao WN, Yao SD, Wang Q, Qian S, Wang W, Han Y (2003) Reaction of carotenoids with CCl3OO· by using pulse radiolysis[J]. Sci China (Ser B) 46:57–62Google Scholar
- 7.Tang RZ, Zhang P, Li HX, Liu YC, Wang WF (2011) Pulse radiolysis study of the reactions between phenothiazine and CCl3OO·, ·OH [J]. Acta Phys -Chim Sin 27:1975–1197Google Scholar
- 10.Asha MK, Debraj D, Dethe S, Bhaskar A, Muruganantham N, Deepak M (2017) Effect of flavonoid-rich extract of Glycyrrhiza Glabra on gut-friendly microorganisms, commercial probiotic preparations, and digestive enzymes[J]. J Nutraceuticals Funct Med Foods 14:323–333Google Scholar
- 11.Kang XF, Li HL, Wang WQ (2016) Evaluation of the antioxidant activity of fat-soluble flavonoids in aerial parts of Glycyrrhiza Uralensis Fisch[J]. Global Traditional Chin Med 9:567–570Google Scholar
- 12.Yang R, Yuan BC, Ma YS, Zhou S, Zhang HZ, Liu JY, Li WD, Liu Y (2016) Simultaneous determination of liquiritin, isoliquiritin, liquiritigenin and isoliquiritigen in Glycyrrhiza Uralensis Fisch., Glycyrrhiza Glabra L. and Glycyrrhiza Inflata Bat. by HPLC.[J]. Chin J Pharm Anal 36:1729–1736Google Scholar
- 13.Jia SS, Ma CM, Wang JM (1990) Studies on flavonoid constituents isolated from the leaves of Glycyrrhiza uralensis Fisch. [J]. Acta Pharm Sin 25:758–762Google Scholar
- 14.Frisch MJ, Trucks GW, Schlegel HB, Scuseria GE, Robb MA, Cheeseman JR, Scalmani G, Barone V, Mennucci B, Petersson GA, Nakatsuji H, Caricato M, Li X, Hratchian HP, Izmaylov AF, Bloino J, Zheng G, Sonnenberg JL, Hada M, Ehara M, Toyota K, Fukuda R, Hasegawa J, Ishida M, Nakajima T, Honda Y, Kitao O, Nakai H, Vreven T, Montgomery Jr J-A, Peralta JE, Ogliaro F, Bearpark M, Heyd JJ, Brothers E, Kudin KN, Staroverov VN, Kobayashi R, Normand J, Raghavachari K, Rendell A, Burant JC, Iyengar SS, Tomasi J, Cossi M, Rega N, Millam JM, Klene M, Knox JE, Cross JB, Bakken V, Adamo C, Jaramillo J, Gomperts R, Stratmann RE, Yazyev O, Austin AJ, Cammi R, Pomelli C, Ochterski JW, Martin RL, Morokuma K, Zakrzewski VG, Voth GA, Salvador P, Dannenberg JJ, Dapprich S, Daniels AD, Farkas O, Foresman JB, Ortiz JV, Cioslowski J, Fox DJ (2009) Gaussian 09 (Revision A. 02). Gaussian Inc., WallingfordGoogle Scholar
- 15.Zhao Y, Truhlar DG (2008) The M06 suite of density functionals for main group thermochemistry, thermochemical kinetics, noncovalent interactions, excited states, and transition elements: two new functionals and systematic testing of four M06-class functionals and 12 other functionals. Theor Chem Accounts 120:215–241CrossRefGoogle Scholar
- 21.Benson SW (1982) The foundations of chemical kinetics. RE Krieger, MalabarGoogle Scholar