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Spectroscopic characterization of fulvic acids extracted from the rock exudate Shilajit |
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| Authors: | Rajesh Khanna Matthias Witt Md. Khalid Anwer Suraj P. Agarwal Boris P. Koch |
| Affiliation: | aDepartment of Pharmaceutics, Jamia Hamdard University, Hamdard Nagar, New Delhi 110 062, India;bDabur Research Foundation, 22, Site IV, Sahibabad, Ghaziabad, Uttar Pradesh 201 010, India;cBruker Daltonik GmbH, Fahrenheitstrasse 4, 28359 Bremen, Germany;dAlfred-Wegener-Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany;eUniversity of Applied Sciences, An der Karlstadt 8, 27568 Bremerhaven, Germany |
| Abstract: | The present work describes the extraction of fulvic acids (FA) from Shilajit and its spectroscopic and mass spectrometric characterization. The spectral features obtained from FT-IR and 1HNMR were similar to those reported for humic substances from other sources. The molecular elemental composition analysis by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) in electrospray negative ion mode resulted in extraordinary high average O/C ratios (0.55) which might be caused by a significant contribution of carbohydrates in Shilajit. A very high average H/C ratio of 1.27 also points to dominant aliphatic or alicyclic structures and relatively low aromaticity. The average molecular formula of the nitrogen free elemental compositions measured by FT-ICR mass spectrometry is C18.2H23.0O10.0. |
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