An investigation of the root bark of Bauhinia pentandra (Fabaceae) led to the isolation and characterization of the cyanoglucoside riachin (1). The structure of 1 was established from the IR, HR-ESI-MS, and NMR spectral data, including 2D NMR experiments. The absolute configuration of 1 was determined by circular dichroism spectroscopy. The extract, its various fractions, and the compound riachin from Bauhinia pentandra demonstrated antioxidant potential in DPPH and ABTS tests and exhibited metal chelating activity on ferrous ions (Fe2+).
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Acknowledgment
The authors would like to thank the CNPq (TMSS, CAC, and MFA research fellowships) and FACEPE (PRONEM APQ-1232.1.06/10 and PPBio No. 558317/2009-0) for financial support and the CENAPESQ and CETENE analytical centers for the recorded data that they kindly provided. MJSF thanks PRPPG-UFRPE for fellowship support.
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Published in Khimiya Prirodnykh Soedinenii, No. 4, July–August, 2013, pp. 587–591.
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Silva, T.M.S., Lins, A.C.d.S., Sarmento-Filha, M.J. et al. Riachin, a new cyanoglucoside from Bauhinia pentandra and its antioxidant activity. Chem Nat Compd 49, 685–690 (2013). https://doi.org/10.1007/s10600-013-0707-9
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DOI: https://doi.org/10.1007/s10600-013-0707-9