Abstract
Biotransformation of naringenin with Aspergillus niger CGMCC 3.4628 yielded two hydroxylation products which were identified unambiguously as 6-hydroxylnaringenin (carthamidin) and 8-hydroxylnaringenin (isocarthamidin) by ESI–MS and 1H-NMR. Both products simultaneously arrived at high level after 48 h in the biotransformation process. The highest conversion efficiency of carthamidin was 0.38 mg/mg of naringenin and that of isocarthamidin was 0.43 mg/mg of naringenin. Antioxidant property assay using a thin layer chromatography-bioautographic-based DPPH scavenging method demonstrated that both hydroxylation metabolites exhibited much stronger activity than naringenin. The high efficiency and convenient procedure makes the biotransformation with A. niger described in current work a potential way to produce carthamidin and isocarthamidin.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (No. 30973878). We gratefully thank Professor Gui-Xin Chou for providing the compounds and Miss Li-Hua Gu for the help in the antioxidant activity assay.
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Xu, J., Yang, L., Zhao, SJ. et al. An efficient way from naringenin to carthamidine and isocarthamidine by Aspergillus niger . World J Microbiol Biotechnol 28, 1803–1806 (2012). https://doi.org/10.1007/s11274-011-0934-9
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DOI: https://doi.org/10.1007/s11274-011-0934-9