Citation: Song-Shan QIU, Cui-Cui JIANG, Ru-Jin ZHOU, Chun-Hai LI. Geometrical Structures and Activities of Free Radical Scavenging Studies of Baicalein and Scutellarein[J]. Chinese Journal of Structural Chemistry, ;2020, 39(1): 57-65. doi: 10.14102/j.cnki.0254-5861.2011-2391 shu

Geometrical Structures and Activities of Free Radical Scavenging Studies of Baicalein and Scutellarein

Development Centre of Technology for Fruit & Vegetable Storage and Processing Engineering, School of Biology and Food Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China

Corresponding author: Cui-Cui JIANG, 534365779@qq.com Ru-Jin ZHOU, 40305170@qq.com
Received Date: 1 April 2019
Accepted Date: 24 June 2019

Fund Project: the Natural Science Fundation of Guangdong Province 2018A030307051Science and Technology Planning Project of Guangdong Province 2017A020225043Science and Technology Planning Project of Guangdong Province 2012gczxB001

Figures(4)

In order to study the free radical scavenging capacity and molecular structures of baicalein and scutellarein, the structure-activity relationship of these two molecules was analyzed. The geometric structures of the compounds were optimized by DMol³ code based on density functional theory. The theoretical parameters of the atomic charge distribution, the distribution of molecular frontier orbital, the energy difference and Fukui functions were calculated. Meantime, superoxide anion free radical and 1, 1-diphenyl-2-picrylhydrazyl radical (DPPH) methods were used to determine the scavenging capacity of the compounds. The results showed that the scavenging rate of DPPH radicals and superoxide anion radicals increased with the increase of sample concentration, and had a dose-effect relationship. The radical-scavenging activities in the order of baicalein > scutellarein > BHT were showed. The p-π conjugation of the hydroxyl oxygen atom influenced the certain ability to repelling electrons in the molecular structures of baicalein and scutellarein based on the data of the atomic charge distribution, the distribution of molecular frontier orbital, the energy difference and Fukui functions. Hydroxyl groups were more susceptible to attack and exhibit free radical scavenging activity. The oxygen atom in the phenolic hydroxyl group of the molecule structure of the samples may be the reaction active sites where the electrophilic reaction occurred. These results offer useful theoretical bases for the research and application of antioxidant activities of substances containing such molecular structures.
- density functional theory,
- baicalein,
- scutellarein,
- free radical scavenging
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