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Original Articles

Characterization of nucleobases in sea buckthorn leaves: An HPTLC approach

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Pages 50-57 | Published online: 23 Feb 2017
 

ABSTRACT

The present study aims to establish a high-performance thin layer chromatography (HPTLC)-based comparative analysis, directed toward characterization of nucleobases in aqueous and alcoholic extracts of sea buckthorn leaves from three different varieties: Hippophae salicifolia, Hippophae rhamnoides mongolica, and Hippophae rhamnoides turkestanica. The alcoholic and aqueous leaf extracts from these sea buckthorn varieties were prepared using accelerated solvent extraction technique. A novel HPTLC method for separating and identifying six nucleobases, namely, guanosine, guanine, cytosine, adenine, uracil, and thymine were adopted. HPTLC analysis indicated the presence of one or more of these nucleobases in a total of six leaf extracts evaluated, their quantities varying from 0.23 to 7.76 µg nucleobase per mg of extract. Though a typical trend could not be observed in the values obtained, the extracts were found to be considerably rich with respect to nucleobase contents. The results acquired from HPTLC were subsequently validated by hyphenation with mass spectrometry and also by applying chemometric tools in form of heat maps, hierarchical cluster dendrograms, and principal component analysis. The presence of nucleobases in the leaf extracts was confirmed by HPLC as well but HPTLC proved to be a better approach for characterization of nucleobases in plant extracts, than high performance liquid chromatography (HPLC).

GRAPHICAL ABSTRACT

Acknowledgments

The authors are thankful to The Director, DIPAS (DRDO) for her support throughout the work reported. The authors are also grateful to the Ministry of Defence, Government of India, for providing all the necessary facilities and funding. Special thanks are extended to Dr Virendra Singh, HPAU, Palampur for authenticating the sea buckthorn samples used in the study.

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