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Papers by Kaizer Thembo

Research paper thumbnail of Antifungal and antimycotoxigenic activities of four weedy plant extracts against selected mycotoxigenic fungi

Research paper thumbnail of Antioxidant activity of some African medicinal and dietary leafy African vegetables

AFRICAN JOURNAL OF BIOTECHNOLOGY, 2012

Seven medicinal and dietary plant species from Southern Africa were analysed for their antioxidan... more Seven medicinal and dietary plant species from Southern Africa were analysed for their antioxidant and total phenolic content. These were Lippia javanica, Tagetes minuta, Bidens pilosa, Vigna unguiculata, Amaranthus spinosus, Telfairia occidentalis and Corchorus olitarius. Aqueous methanol extracts were tested for free radical scavenging and anti-oxidant activity using three standard assays including 2,2′azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS), 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing antioxidant potential (FRAP). The Folin-Ciocalteu assay was used to determine the total phenolic content with gallic acid as a standard. The antioxidant activity of the plants ranged from 0.76 to 5.77 mmol TEAC/100 g (ABTS), 16.29 to 1711.22 mmol TEAC/100 g (DPPH) and 0.58 to 6.12 mmol TEAC/100 g (FRAP). B. pilosa and C. olitarius had the best activity in all assays, while V. unguiculata and A. spinosus were the least active. The total phenolic content ranged from 19.79 to 333.56 mg gallic acid equivalent (GAE)/100 g. In general, there was a good correlation between antioxidant activity and total phenolic content. These results imply that these plant species may possess health promoting effects and might be potential sources of potent natural antioxidants.

Research paper thumbnail of Ethnoveterinary Medicine in Southern Africa

Herbal Medicines for Animal Health, 2010

Research paper thumbnail of Antifungal and antimycotoxigenic activities of four weedy plant extracts against selected mycotoxigenic fungi

Research paper thumbnail of Antioxidant activity of some African medicinal and dietary leafy African vegetables

AFRICAN JOURNAL OF BIOTECHNOLOGY, 2012

Seven medicinal and dietary plant species from Southern Africa were analysed for their antioxidan... more Seven medicinal and dietary plant species from Southern Africa were analysed for their antioxidant and total phenolic content. These were Lippia javanica, Tagetes minuta, Bidens pilosa, Vigna unguiculata, Amaranthus spinosus, Telfairia occidentalis and Corchorus olitarius. Aqueous methanol extracts were tested for free radical scavenging and anti-oxidant activity using three standard assays including 2,2′azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS), 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing antioxidant potential (FRAP). The Folin-Ciocalteu assay was used to determine the total phenolic content with gallic acid as a standard. The antioxidant activity of the plants ranged from 0.76 to 5.77 mmol TEAC/100 g (ABTS), 16.29 to 1711.22 mmol TEAC/100 g (DPPH) and 0.58 to 6.12 mmol TEAC/100 g (FRAP). B. pilosa and C. olitarius had the best activity in all assays, while V. unguiculata and A. spinosus were the least active. The total phenolic content ranged from 19.79 to 333.56 mg gallic acid equivalent (GAE)/100 g. In general, there was a good correlation between antioxidant activity and total phenolic content. These results imply that these plant species may possess health promoting effects and might be potential sources of potent natural antioxidants.

Research paper thumbnail of Ethnoveterinary Medicine in Southern Africa

Herbal Medicines for Animal Health, 2010

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