Soil Parameters Affecting the Antioxidant Activity of Hypoxis hemerocallidea Corm Extracts in Different Areas of South Africa

N. M. Mkolo, O. O. Olaokun*, J. O. Olowoyo, J. N. Eloff, V. Naidoo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Hypoxis hemerocallidea is wild harvested and widely used due inter alia to its strong antioxidant activity. Antioxidant activity is linked to plant stressors like soil heavy metals concentrations and pH. If high antioxidant activity is caused by heavy metals stressing the plant, the plant may not be completely safe. Soils and H. hemerocallidea corms were collected from five different geographical regions of South Africa. The highest corm and soil heavy metals concentration were Fe, Mn and Cr, with Fe having the highest, particularly for corms collected from Ga-rankuwa (83.7 ± 0.03 µg/g). The soil and corm samples from Ga-rankuwa with high levels of metals (Fe, Cr, Ni, Pb) had greater antioxidant activity (EC50 of 1.68 ± 0.49 µg/mL). Despite corms showing ability to bio-accumulate heavy metals, the antioxidant activity could not be linked to environmental conditions. The results highlight potential danger of using naturally harvested bulbs growing in unidentified soils.

Original languageEnglish
Pages (from-to)1467-1472
Number of pages6
JournalAsian Journal of Chemistry
Volume32
Issue number6
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • Antioxidant activity
  • Heavy metals
  • Hypoxis hemerocallidea corm
  • Polyphenolic content

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