Abstract
The radical scavenging activity of shikonin and acylshikonin derivatives was studied by using density functional theory. The hydrogen bond property of the studied structures was investigated using the atoms in molecules (AIM) theory. It turned out that the hydrogen bond is important for good radical scavenging activity. The hydrogen atom transfer for shikonin and acylshikonin derivatives is difficult to obtain because of the high bond dissociation energy (BDE). However, shikonin and acylshikonin derivatives appear to be good candidates for the one-electron-transfer. The introduction of acyl groups for shikonin decreases the ionization potential (IP) values compared with that of shikonin. The acylshikonin derivatives with 1H-pyrrole, furan, and thiophene groups are expected to be of the highest radical scavenging activity among the compounds investigated in this study. Taking this system as an example, we present an efficient method for the investigation of radical scavenging activity from theoretical point of view.
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Financial support from the Research Program of Sciences at Universities of Inner Mongolia Autonomous Region (NJzy08148) is gratefully acknowledged.
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Jin, R., Bai, Y. Theoretical investigation of the radical scavenging activity of shikonin and acylshikonin derivatives. J Mol Model 18, 1401–1408 (2012). https://doi.org/10.1007/s00894-011-1170-9
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DOI: https://doi.org/10.1007/s00894-011-1170-9