Evaluation of the anti-radical activity of methanolic and aqueous extracts of stem, stem bark and leaves of Waltheria indica by scavenging the free radical cation ABTS

N’Negue ÉP Mezui-Mbeng MA; Lendoye E; Nguema Edzang RW; Ella Ndong JG; Mambimba C; Ngo-Thjam E Ngou-Milama E

doi:10.22271/plants.2021.v9.i4b.1320

**Evaluation of the anti-radical activity of methanolic and aqueous extracts of stem, stem bark and leaves of Waltheria indica by scavenging the free radical cation ABTS**

author(s)
N’Negue ÉP Mezui-Mbeng MA, Lendoye E, Nguema Edzang RW, Ella Ndong JG, Mambimba C and Ngo-Thjam E Ngou-Milama E

abstract
Background: Waltheria indica is an antioxidant rich flowering plant species in its various parts and usually used in sub-Saharan Africa’s traditional medicine. The aim of this work was to evaluate the anti-radical activity of different concentrations of aqueous and methanolic extracts of stem, stem bark and leaves of Waltheria indica, in order to determine the most antioxidant organ of the plant on the one hand and the type of extraction allowing to collect the maximum of bioactive compound on the other hand.

Methods: The method used is based on the measurement of the free radicals of the radical cation of 2,2'-azinobis [3-ethylbenzothiazoline-6-sulfonic acid] (ABTS•+) compared to that of a reference antioxidant, the gallic acid.

Results and Discussion: With the methanolic extraction, the results obtained showed that the stem bark was the most active organ followed by the stem and then the leaves. The IC₅₀ obtained were: for the stem bark (IC₅₀ = 4.3 µg.mL^-1); for the stem (IC₅₀ = 6 µg.mL^-1); and the leaf (IC₅₀ = 37.5 µg.mL^-1). Gallic acid, the referenced antioxidant, showed an IC₅₀ of 0.41 µg.mL^-1. Regarding the extraction method, aqueous extraction had a higher yield (IC₅₀ of stem aqueous extract = 2.5 µg.mL^-1) compare to methanolic extraction (IC₅₀ of stem methanolic extract = 6 µg.mL^-1).

Conclusion: Aqueous extraction showed a better yield than methanolic extraction. The various organs of Waltheria indica, particularly the stem bark, can provide natural antioxidants that can be used in preventive medicine.

doi
https://doi.org/10.22271/plants.2021.v9.i4b.1320

Pages : 122-128 | 706 Views | 186 Downloads

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How to cite this article:

N’Negue ÉP Mezui-Mbeng MA, Lendoye E, Nguema Edzang RW, Ella Ndong JG, Mambimba C, Ngo-Thjam E Ngou-Milama E. Evaluation of the anti-radical activity of methanolic and aqueous extracts of stem, stem bark and leaves of Waltheria indica by scavenging the free radical cation ABTS. J Med Plants Stud 2021;9(4):122-128. DOI: 10.22271/plants.2021.v9.i4b.1320

2021, Vol. 9, Issue 4, Part B

**Evaluation of the anti-radical activity of methanolic and aqueous extracts of stem, stem bark and leaves of Waltheria indica by scavenging the free radical cation ABTS**

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