ARGINASE INHIBITORY ACTIVITY OF STEM BARK EXTRACTS OF CAESALPINIA TORTUOSA ROXB
DOI:
https://doi.org/10.22159/ijap.2018.v10s1.27Keywords:
Caesalpinia tortuosa, Arginase inhibition, Phytochemical screening, Total flavonoids, Total phenolicsAbstract
Objective: This study aimed to evaluate the arginase inhibitory activity of Caesalpinia tortuosa Roxb. stem bark extracts.
Methods: C. tortuosa Roxb. stem bark extracts were obtained through reflux extraction using n-hexane, ethyl acetate, and methanol and their
inhibitory activity against arginase was measured using a microplate reader at 430 nm. Active extracts were subjected to phytochemical analysis
and based on the qualitative phytochemical analysis, quantitative data regarding flavonoid and phenolic contents were obtained. The total flavonoid
content of active extracts was determined using AlCl3 colorimetric method, and the phenolic content was determined using Folin–Ciocalteu method.
Results: Ethyl acetate and methanol extracts of C. tortuosa Roxb. inhibited activity of arginase with IC50 values of 33.81 and 11.58 μg/mL,
respectively, nor-NOHA acetate as standard drug inhibited arginase with IC50 values of I3.77 μg/mL. Both active extracts contained saponins,
tannins, and flavonoids. Ethyl acetate and methanol extracts showed a total flavonoid content of 7.41 mgQE/g and 5.05 mgQE/g and total
phenolic content of 27.55 mgGE/g and 17.16 mgGE/g, respectively. Methanol extracts had a higher inhibitory activity than ethyl acetate
extracts despite having flavonoid and phenolic content, thereby suggesting no correlation between arginase inhibitory activity and flavonoid
or phenolic content.
Conclusion: Ethyl acetate and methanolic extracts of C. tortuosa Roxb. stem barks containing flavonoids, tannins, and saponins displayed arginase
inhibitory activity, and no correlation was observed between arginase inhibitory activity and flavonoid and phenolic content.
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