School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa.
J Environ Sci Health B. 2020;55(4):406-415. doi: 10.1080/03601234.2019.1707016. Epub 2019 Dec 27.
is an indigenous South African medicinal plant species from the Aizoaceae family that bears edible fruit that is consumed for nutritional value. In this study, the elemental distribution in fruit and growth soil from fifteen sites in KwaZulu-Natal (South Africa) was determined along with soil pH, soil organic matter and cation exchange capacity, to assess for nutritional value and the effect of soil quality on elemental uptake. The results showed elemental concentrations in fruit to be in decreasing order of Ca (6235-32755 mg kg) > Mg (2250-5262 mg kg) > Fe > Mn > Zn (20.9-50.6 mg kg) > Cu (3.83-20.6 mg kg) > Pb > Cr > Cd > As ∼ Co ∼ Ni ∼ Se and no potential health risk due to metal toxicity from average consumption. For sites that had high levels of Cd and Pb, bioaccumulation occurred from atmospheric deposition. Concentrations of elements in soil were found to be in decreasing order of Fe (1059-63747 mg kg) > Ca (1048-41475 mg kg) > Mg > Mn (9.76-174 mg kg) > Cr (1.55-135 mg kg) > Zn (0.76-58.2 mg kg) > Se > Cu > Ni > Pb > Co > As ∼ Cd with no evidence of heavy metal contamination. This study revealed that the plant inherently controlled uptake of essential elements according to physiological needs and that the concentrations of essential elements in the fruit could contribute positively to the diet.
是一种来自马齿苋科的南非本土药用植物物种，其果实可食用，具有营养价值。在这项研究中，测定了南非夸祖鲁-纳塔尔省 15 个地点的果实和生长土壤中的元素分布情况，以及土壤 pH 值、土壤有机质和阳离子交换能力，以评估其营养价值和土壤质量对元素吸收的影响。结果表明，果实中的元素浓度按降序排列为 Ca（6235-32755mgkg）>Mg（2250-5262mgkg）>Fe>Mn>Zn（20.9-50.6mgkg）>Cu（3.83-20.6mgkg）>Pb>Cr>Cd>As∼Co∼Ni∼Se，且由于平均消费水平，金属毒性不会造成潜在的健康风险。对于 Cd 和 Pb 含量较高的地点，元素的生物累积是由大气沉降引起的。土壤中元素的浓度按降序排列为 Fe（1059-63747mgkg）>Ca（1048-41475mgkg）>Mg>Mn（9.76-174mgkg）>Cr（1.55-135mgkg）>Zn（0.76-58.2mgkg）>Se>Cu>Ni>Pb>Co>As∼Cd，没有重金属污染的证据。本研究表明，植物根据生理需要内在地控制必需元素的吸收，并且果实中必需元素的浓度可以对饮食产生积极影响。
