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Comparison Among Five Eucalyptus Species Based on Their Leaf Contents of Some Primary and Secondary Metabolites

[ Vol. 20 , Issue. 7 ]

Author(s):

Alyaa Nasr, Tehmina Saleem Khan, Shi-Ping Huang, Bin Wen, Jian-Wen Shao* and Guo-Ping Zhu   Pages 573 - 587 ( 15 )

Abstract:


Background: Eucalyptus belongs to the Myrtaceae family; it is the most planted hardwood forest crop worldwide, representing a global renewable resource of fiber, pharmaceuticals and energy.

Objective: Comparing among five species; E. maidenii, E. robusta, E. citriodora, E. tereticornis and E. camaldulensis, seeking for the richest source of nutrients and pharmaceuticals.

Methodology: Eucalyptus samples were subjected to some chemical determinations for both primary and secondary metabolites to verify their nutritional and pharmaceutical importance related to different extracts. GC-MS analysis was applied to detect the presence of some individual phenolic constituents in their leaves.

Results: E. robusta recorded the maximum contents of carbohydrates (46.13%) and protein (31.91%). While, E. camaldulensis contained the highest contents of total phenolic compounds (46.56 mg/g), tannins (40.01 mg/g) and antioxidant activities assayed by phosphomolybednum method (57.60 mg/g), and followed by E. citridora. However, E. tereticornis exhibited the highest reducing power ability (151.23 mg/g). The GC-MS highlighted 20 phenolic constituents and antioxidants which varied in their abundance in leaves of Eucalyptus species, 8 individual phenolics (hydroquinone, hesperitin, pyrogallol, resorcinol, protocatechuic acid, naringenin, chlorogenic acid and catechin) were maximally recorded with E. camaldulensis and secondly with E. citridora in case of at least 5 components. Nevertheless, gallic and quinic acids were more abundant in the leaves of E. tereticornis, which may explain its high corresponding reducing powers.

Conclusion: Acetone-water combination has enhanced the phenolics extraction from Eucalyptus tissues. This is the first report aiming to compare between the aforementioned Eucalyptus species highlighting either their nutritional or medicinal importance.

Keywords:

Eucalyptus, carbohydrates, protein, phenolic compounds, antioxidants, GC-MS.

Affiliation:

The Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes and The Research Center of Life Omics and Health, Anhui Normal University, Wuhu 241000, Anhui, The Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes and The Research Center of Life Omics and Health, Anhui Normal University, Wuhu 241000, Anhui, The Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes and The Research Center of Life Omics and Health, Anhui Normal University, Wuhu 241000, Anhui, The Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes and The Research Center of Life Omics and Health, Anhui Normal University, Wuhu 241000, Anhui, The Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes and The Research Center of Life Omics and Health, Anhui Normal University, Wuhu 241000, Anhui, The Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes and The Research Center of Life Omics and Health, Anhui Normal University, Wuhu 241000, Anhui



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