Open AccessSoil Parameters Affecting the Antioxidant Activity of Hypoxis hemerocallidea Corm Extracts in Different Areas of South Africa
Author(s) -
Nqobile Monate Mkolo,
Oyinlola Oluwunmi Olaokun,
Joshua O. Olowoyo,
J.N. Eloff,
Vinny Naidoo
Publication year - 2020
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2020.22555
Subject(s) - corm , chemistry , antioxidant , soil water , heavy metals , environmental chemistry , botany , horticulture , biology , ecology , biochemistry
Hypoxis hemerocallidea is wild harvested and widely used due inter alia to its strong antioxidantactivity. 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 completelysafe. Soils and H. hemerocallidea corms were collected from five different geographical regions ofSouth Africa. The highest corm and soil heavy metals concentration were Fe, Mn and Cr, with Fehaving the highest, particularly for corms collected from Ga-rankuwa (83.7 ± 0.03 μg/g). The soil andcorm samples from Ga-rankuwa with high levels of metals (Fe, Cr, Ni, Pb) had greater antioxidantactivity (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 potentialdanger of using naturally harvested bulbs growing in unidentified soils