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Isolation and Identification of α-Glucosidase and Protein Glycation Inhibitors from Stereospermum colais

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Abstract

Stereospermum colais (family Bignoniaceae) is a well-known pharmacologically potent medicinal plant reported in traditional systems of medicine. Phytochemical investigation of the roots of S. colais resulted in the isolation of seven compounds, and the metabolites were screened for its α-glucosidase enzyme inhibition and anti-glycation property. The compounds identified were β-sitosterol (1), 2-(4′-hydroxyphenyl) ethyl undecanoate (2), 2-(4′-hydroxyphenyl)ethyl pentadecanoate (3), 5α-ergosta-7,22-dien-3β-ol (4), ursolic acid (5), lapachol (6), and pinoresinol (7). Ursolic acid, lapachol, and pinoresinol possessed IC50 values of 119.01, 130.29, and 125.62 nM, respectively, compared to standard ascorbic acid with an IC50 value of 201.01 nM. The other compounds failed to show the activity. Results of the current study showcased the possible exploration of this medicinal plant for the treatment of type 2 diabetes in line with the development of phytopharmaceutical industry.

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Acknowledgments

The first author thanks the Council of Scientific and Industrial Research for the award of Senior Research Fellowship and also thanks the director and head of the division for providing all the necessary facilities for carrying out the work. The authors also thank Ms. Saumini Mathew, Mr. Saran P. Raveendran, and Ms. S. Viji of CSIR-NIIST for recording NMR and mass spectra.

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Correspondence to K. P. Padmakumari.

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Rani, M.P., Raghu, K.G., Nair, M.S. et al. Isolation and Identification of α-Glucosidase and Protein Glycation Inhibitors from Stereospermum colais . Appl Biochem Biotechnol 173, 946–956 (2014). https://doi.org/10.1007/s12010-014-0898-y

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