Antioxidant activity of extracts from six different Sudanese plant materials

Abstract

Methanolic extracts obtained by manual solvent extraction (MSE) and accelerated solvent extraction (ASE) of different Sudanese plant materials (Sclerocarya birrea leaves, Salvadora persica bark and leaves, Combretum hartmannianum leaves, Guiera senegalensis leaves and roots) were investigated for their antioxidant activity. There was no significant difference between the two extraction methods ( p < 0.01) regarding the total amount of phenolic compounds expressed as gallic acid equivalents (GAE) (52.6-166.7 mg GAE/g total extractable compounds for MSE and 53.1-169.3 mg GAE/g for ASE). In comparison to a control without extract, the extracts were remarkably effective in the b-carotene bleaching method, whereas the effectiveness was half or less in comparison to Trolox as standard antioxidant. Also using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method antioxidant activity could be shown in comparison to a control, however, the extracts were less effective than Trolox. No significant difference was found between the two extraction methods. The increase of the peroxide value of sunflower oil during storage at 708C was markedly lower after addition of the extracts in comparison to the control, but in the Rancimat test (1208C) the extracts showed only a small stabilization factor (F ¼ 0.9-1.4) especially in comparison to Trolox (F ¼ 5.8).

Microwave-assisted extraction for recovery of polyphenolic antioxidants from ripe mango (Mangifera indica L.) peel using lactic acid/sodium acetate deep eutectic mixtures

“…An induction period of 4.02 h for sunflower oil mixed with purified extract was reported as compared to 2.26 h for sunflower oil (Electronic supplementary material Figure S3(a) and (b)).The large induction time represents higher antioxidant activity. Taha et al. (2010) and Sun and Ho (2005) also found a similar trend while studying antioxidant activity of different plant materials.…”

“…Oxidative stability was determined using Rancimat tubes containing 2 g of each mixture. Experiments were performed at 120 ℃ for 20 h using Rancimat (Metrohm, Switzerland) instrument (Sun and Ho, 2005; Taha et al., 2010). Air supply was maintained at 20 l h −1 .…”

In vitro and in vivo antimicrobial activity of Algerian Hoggar Salvadora persica L. extracts against microbial strains from children's oral cavity

“…They were found to be 105.90, 129.10 and 62.90 mg GAE/g extract in the Gezira sample, respectively. Another study found that the amount of total extractable phenolics from bark and leaves of Salvadora persica was 52, 6 and 166, 7 mg GAE/ g DW, respectively (Taha et al, 2010).…”

Innovative biocomposite development based on the incorporation of Salvadora persica in acrylic resin for dental material

“…39 Concerning Taha et al, they found that the amount of the total extractable polyphenol from the bark and leaves of S. persica was 52.6 and 166.7 mg of GAE/g of DW, respectively. 40 The total flavonoid concentrations present in the EES and EEC were 52.12 + 2.32 mg of QE/g of S. persica and 43.62 + 5.90 mg of QE/g of composite, respectively. The ratios of total flavonoids/ total polyphenol in S. persica (0.59) and in the composite (0.61) indicate high proportions of flavonoids.…”