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The recent advancements in the instrumentation and techniques have made mass spectrometry, the most sensitive and widely
used analytical method. Such advancements have opened up the possibilities of identification and structural analysis of
bioactive compounds present in low quantities which were difficult to detect with the conventional approaches. This presentation
will give an overview of the targeted and non-targeted workflows utilizing power of high resolution accurate mass spectrometry
for comparative screening of phytochemicals among various plant species. The analysis of these bioactive compounds is essential
to understand the secret of their effectiveness.
Three varieties of Tulsi (
) viz Rama (
), Krishna (
) and Vana (
were screened using a generic High Resolution Mass Spectrometric (HRMS) workflow followed by Principal component analysis
(PCA) to identify the relative variations of the common phytochemicals present in the plant. Simultaneous TOF MS and MS/MS
allowed accurate mass of parent ions and MS/MS data to be used for analyte identification and confirmation on a single injection.
Preliminary statistical analysis by Principal Component Analysis (PCA) and t-Test processing using MarkerView
differentiates three varieties and the bioactive components contributing to the differences between the species. Targeted analysis
using XIC manager was carried out using the m/z of 94 compounds reported in literature associated with
mass accuracy which is a prerequisite for alignment and profiling of complex extracts has been obtained in all the TOFMS and
TOFMS/MS analysis. Formulae prediction using the high resolution MS/MS fragmentation data with Formula Finder tool within
Software was used to predict the best possible elemental composition and ultimately compound identification. We
have been able to identify several compounds that differentiated the three different varieties of Tulsi. Thus, the present study
shows that high throughput identification and comparison of bioactive compounds in different plant species can be achieved by
using high resolution mass spectrometric analysis.
Annu Uppal completed her PhD in Biotechnology from The Indian Institute of Toxicology Research, Lucknow and did her Postdoctoral fellow at School of Life Sciences, Jawaharlal Nehru University. She has more than twenty-nine research papers and book chapters published in peer reviewed journals. She has an extensive experience in giving presentations in International & national conferences. Currently she is with AB SCIEX as Application Support Scientist, and is responsible for support and application development in the proteomics, metabolomics, lipidomics and bioanalysis using high resolution mass spectrometry.
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