Spectroscopic characterization of fulvic acids extracted from the rock exudate Shilajit

Rajesh Khanna; Matthias Witt; Md Khalid Anwer; Suraj P. Agarwal; Boris P. Koch

doi:10.1016/j.orggeochem.2008.08.009

Spectroscopic characterization of fulvic acids extracted from the rock exudate Shilajit

Rajesh Khanna
, Matthias Witt
, Md Khalid Anwer
, Suraj P. Agarwal
, Boris P. Koch

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

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 C_18.2H_23.0O_10.0.

Original language	English
Pages (from-to)	1719-1724
Number of pages	6
Journal	Organic Geochemistry
Volume	39
Issue number	12
DOIs	https://doi.org/10.1016/j.orggeochem.2008.08.009
State	Published - Dec 2008
Externally published	Yes

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10.1016/j.orggeochem.2008.08.009

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title = "Spectroscopic characterization of fulvic acids extracted from the rock exudate Shilajit",

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.",

author = "Rajesh Khanna and Matthias Witt and \{Khalid Anwer\}, Md and Agarwal, \{Suraj P.\} and Koch, \{Boris P.\}",

year = "2008",

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doi = "10.1016/j.orggeochem.2008.08.009",

language = "English",

volume = "39",

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TY - JOUR

T1 - Spectroscopic characterization of fulvic acids extracted from the rock exudate Shilajit

AU - Khanna, Rajesh

AU - Witt, Matthias

AU - Khalid Anwer, Md

AU - Agarwal, Suraj P.

AU - Koch, Boris P.

PY - 2008/12

Y1 - 2008/12

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/56649097342

U2 - 10.1016/j.orggeochem.2008.08.009

DO - 10.1016/j.orggeochem.2008.08.009

M3 - Article

AN - SCOPUS:56649097342

SN - 0146-6380

VL - 39

SP - 1719

EP - 1724

JO - Organic Geochemistry

JF - Organic Geochemistry

IS - 12

ER -

Spectroscopic characterization of fulvic acids extracted from the rock exudate Shilajit

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