Geophila repens,Alzheimer disease,Acetylcholinesterase,Btyrylcholinesterase,Fingerprint,Bioautographic,Phenolic,Antioxidant," /> Geophila repens,Alzheimer disease,Acetylcholinesterase,Btyrylcholinesterase,Fingerprint,Bioautographic,Phenolic,Antioxidant,"/> <em>In vitro</em> antioxidant assessment and a rapid HPTLC bioautographic method for the detection of anticholinesterase inhibitory activity of <em>Geophila repens</em>
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Journal of Integrative Medicine ›› 2017, Vol. 15 ›› Issue (3): 231-241.doi: 10.1016/S2095-4964(17)60326-1

Special Issue: Natural Drug

• Research Article • Previous Articles     Next Articles

In vitro antioxidant assessment and a rapid HPTLC bioautographic method for the detection of anticholinesterase inhibitory activity of Geophila repens

Umesh Chandra Dash, Atish Kumar Sahoo   

  1. Regional Plant Resource Centre, Medicinal & Aromatic Plant Division, Forest & Environment Department, Govt. of Odisha, Nayapalli, Bhubaneswar 751015, India
  • Received:2016-10-09 Accepted:2016-12-30 Online:2017-05-15 Published:2017-05-15
  • Contact: Atish Kumar Sahoo; E-mail: atish_kumar1976@yahoo.co.in
  • Supported by:
    Financial support for this work was provided by the Science and Engineering Research Board, Department of Science and Technology, Govt. of India, New Delhi (Grant No. SB/SO/HS/014/2014).

Objective

Geophila repens (L.) I. M. Johnst. (Rubiaceae), a small, creeping, perennial herb, is claimed to have memory-enhancing property. The goal of this study was to assess its antioxidant and anticholinesterase activity and conduct a rapid bioautographic enzyme assay for screening acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibition of G. repens extracts.

Methods

Antioxidant activity of G. repens extracts was assessed by performing 1,1-diphenyl-2-picrylhydrazyl (DPPH), nitric oxide (NO), superoxide (SOD), hydroxyl (OH) and total antioxidant capacity (TAC) assays. Anticholinesterase activity was investigated by quantifying the AChE and BChE inhibitory activities of chloroform (CGR), ethyl acetate (EGR) and methanol (MGR) extract fractions from G. repens leaves. A rapid high-performance thin-layer chromatography (HPTLC) bioautographic method for the detection of AChE and BChE inhibition was performed.

Results

Among all extract fractions, EGR exhibited the highest half maximal inhibitory concentration (IC50) in DPPH, SOD, NO, OH and TAC assays, with IC50 of (38.33 ± 3.21), (45.14 ± 1.78), (59.81 ± 1.32), (39.45 ± 0.79) and (43.76 ± 0.81) μg/mL respectively. EGR displayed competitive, reversible inhibition of AChE and BChE activities with IC50 of (68.63 ± 0.45) and (59.45 ± 0.45) μg/mL, respectively. Total phenolic and flavonoids contents of EGR were found to be 360.42 mg gallic acid equivalents and 257.31 mg quercetin equivalents per gram of extract. Phytoconstituents of the EGR extract that were inhibitors of cholinesterase produced white spots on the yellow background of HPTLC plates in the bioautographic test.

Conclusion

The results of this study revealed that phenols and flavonoids could be responsible for the antioxidant, anticholinesterase activities of G. repens.

Key words: Geophila repens, Alzheimer disease, Acetylcholinesterase, Btyrylcholinesterase, Fingerprint, Bioautographic, Phenolic, Antioxidant

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