The QSAR study of flavonoid-metal complexes scavenging OH free radical

• Obtain quantum chemistry descriptors of flavonoid-metal complexes using Gaussian 03.
• Obtain important structural descriptors and 4 principal components by SPSS17.0.
• Build 2 QSAR models using ANN between structure and IC50 for scavenging OH.

Flavonoid-metal complexes have antioxidant activities. However, quantitative structure–activity relationships (QSAR) of flavonoid-metal complexes and their antioxidant activities has still not been tackled. On the basis of 21 structures of flavonoid-metal complexes and their antioxidant activities for scavenging OH free radical, we optimised their structures using Gaussian 03 software package and we subsequently calculated and chose 18 quantum chemistry descriptors such as dipole, charge and energy. Then we chose several quantum chemistry descriptors that are very important to the IC50 of flavonoid-metal complexes for scavenging OH free radical through method of stepwise linear regression, Meanwhile we obtained 4 new variables through the principal component analysis. Finally, we built the QSAR models based on those important quantum chemistry descriptors and the 4 new variables as the independent variables and the IC50 as the dependent variable using an Artificial Neural Network (ANN), and we validated the two models using experimental data. These results show that the two models in this paper are reliable and predictable.

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