Antioxidant and Antimicrobial Potential of Extractsfrom Aloe vera Leaves

Carac, Andreea; Boscencu, Rica; Patriche, Simona; Dinica, Rodica Mihaela; Carac, Geta; Gird, Cerasela Elena

Andreea Carac, Rica Boscencu, Simona Patriche, Rodica Mihaela Dinica, Geta Carac, Cerasela Elena Gird

Antioxidant and Antimicrobial Potential of Extractsfrom Aloe vera Leaves

Abstract:

Extracts from the lyophilized Aloe vera leaves powder demonstrated antioxidant and antimicrobial properties. The qualitative analysis of lyophilized Aloe vera leaves, indicated the presence of the ion content (Ca2+, K+, Mg2+, Cu2+, Cr3+, Fe2+, Zn2+etc.) and quantitative analysis (X-ray fluorescence spectrometry) indicated presence of K, Ca, Cr, also Sc and Sb metals. The pH analysis of extracts (aqueous and hydroalcoholic 1:1) were performed at different periods of time (after 5, 10 and 30 days) and it showed a good stability in time. The spectrometric analysis of the fresh extracts after 30 days indicated a slight decrease of absorbance and slows in time compounds degradation. Compounds as reducing agents, monosaccharides and polyholosides, anthraquinones, flavonoids, saponins and tannins were identified in both extracts. The antioxidant properties were demonstrated by permanganometry and cyclic voltammetry technique. The aqueous extract of Aloe vera leaves shown 37.52 % of such bioactive compounds, while in the hydroalcoholic one; the percentage was bigger than 62.41 %. Cyclic voltamograms estimated that the antioxidant capacity is increased for extracts having a medium acid pH. The potential antifungal and antimicrobial activity of the Aloe vera leaves were investigated showing a positive effect. It was observed that Aloe vera leaves inhibited the growth of both gram-positive (Bacillus species) and gram-negative (Coliformi) bacteria.

Keywords:
Aloe vera; chemical composition; antioxidant activity; antimicrobial activity

Issue: 2016, Volume 67, Issue 4

Pages:

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This article is published under the Creative Commons Attribution 4.0 International License

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