title: Exploration of natural enzyme inhibitors with hypoglycemic potentials amongst Eucalyptus Spp. by in vitro assays.
abstract: OBJECTIVE
  To investigate the presence and potency of natural enzyme inhibitors with hypoglycemic potentials amongst Eucalyptus Spp. by in vitro assays.
  
  
  METHODS
  The leaf extracts of the three different Eucalyptus species [E. globulus (EG), E. citriodora (EC), E. camaldulensis (ECA)] were subjected to in vitro assay procedures to explore the prevalence of natural enzyme inhibitors (NEIs) after preliminary qualitative and quantitative phytochemical evaluations, to study their inhibitory actions against the enzymes like α-amylase, α-glucosidase, aldose reductase, angiotensin converting enzyme and dipeptidyl peptidase 4 playing pathogenic roles in type 2 diabetes. The antioxidant potential and total antioxidant capacity of the species were also evaluated.
  
  
  RESULTS
  Major bioactive compounds like polyphenols (341.75 ± 3.63 to 496.85 ± 3.98) and flavonoids (4.89 ± 0.01 to 7.15 ± 0.02) were found in appreciable quantity in three species. Based on the IC50 values of the extracts under investigation, in all assays the effectivity was in the order of EG > ECA > EC. The results of the ferric reducing antioxidant power assay showed that the reducing ability of the species was also in the order of EG > ECA > EC. A strong correlation (R(2) = 0.81-0.99) was found between the phenolic contents and the inhibitory potentials of the extracts against the targeted enzymes.
  
  
  CONCLUSIONS
  These results show immense hypoglycemic potentiality of the Eucalyptus Spp. and a remarkable source of NEIs for a future phytotherapeutic approach in Type 2 diabetes.
authors.affiliation: Baishakhi Dey, Analava Mitra, School of Medical Science and Technology, IIT Kharaghpur 721302, India.
authors.forename: Baishakhi
authors.initials: B
authors.lastname: Dey
authors.affiliation: Baishakhi Dey, Analava Mitra, School of Medical Science and Technology, IIT Kharaghpur 721302, India.
authors.forename: Analava
authors.initials: A
authors.lastname: Mitra
authors.affiliation: Baishakhi Dey, Analava Mitra, School of Medical Science and Technology, IIT Kharaghpur 721302, India.
authors.forename: Prakash
authors.initials: P
authors.lastname: Katakam
authors.affiliation: Baishakhi Dey, Analava Mitra, School of Medical Science and Technology, IIT Kharaghpur 721302, India.
authors.forename: Rajeev K
authors.initials: RK
authors.lastname: Singla
keywords: Eucalyptus; Flavonoids; Hypoglycemic; In vitro assays; Natural enzyme inhibitors; Pathogenic; Polyphenols
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