Ngcobo Ayanda, Mianda Sephora Mutombo, Seke Faith, Sunette Laurie M, Sivakumar Dharini
Department of Crop Sciences, Tshwane University of Technology, Pretoria 0183, South Africa.
Agricultural Research Council-Vegetable, Industrial and Medicinal Plants, Private Bag X293, Pretoria 0001, South Africa.
Antioxidants (Basel). 2024 Mar 11;13(3):338. doi: 10.3390/antiox13030338.
Purple sweet potatoes ( (L.) genotype) in Southern Africa have a phytonutritional composition and antioxidant properties that can increase incomes and improve nutrition. This study compared the phytonutrient composition and antioxidant properties of four purple-colour sweet potato genotypes (local Purple-purple, '2019-1-1', and USA genotypes, '08-21P' and '16-283P'). These purple sweet potato genotypes were characterised by UPLC/QTOF/MS and 16 phenolic compounds were identified. Purple-purple (very dark purple) showed the highest concentration of cyanidins and peonidin derivatives. Chlorogenic acid derivatives were highest in the genotype '16-283P'. 'Puple-purple' and '16-283P' displayed the strongest antioxidant power and scavenging activities. Diaffeoylquinic acid isomer 1 was identified as the marker candidate for distinguishing the four purple sweet potato genotypes. Southern Africa's highest-protein sweet potato genotypes are Purple-purple (28.81 g/100 g) and '08-21 P' (24.31 g/100 g). A 13.65 g portion of '2019-1-1' would meet the Recommended Dietary Allowance (RDA) for iron for men, while 25.59 g would meet the RDA for children, and 30.72 g would meet the RDA for women. The sweet potato root of genotype '2019-1-1' provides 31.43 g of Zn per day for children and 22.86 g for adults. The roots of local cultivar Purple-purple can be used as functional food ingredients.
非洲南部的紫甘薯（(L.) 基因型）具有植物营养成分和抗氧化特性，能够增加收入并改善营养状况。本研究比较了四种紫色甘薯基因型（当地的紫 - 紫、‘2019 - 1 - 1’以及美国基因型‘08 - 21P’和‘16 - 283P’）的植物营养素组成和抗氧化特性。通过超高效液相色谱/四极杆飞行时间质谱联用仪（UPLC/QTOF/MS）对这些紫色甘薯基因型进行了表征，并鉴定出16种酚类化合物。紫 - 紫（深紫色）显示出最高浓度的矢车菊素和芍药素衍生物。绿原酸衍生物在基因型‘16 - 283P’中含量最高。‘紫 - 紫’和‘16 - 283P’表现出最强的抗氧化能力和清除活性。二阿魏酰奎宁酸异构体1被确定为区分这四种紫色甘薯基因型的候选标志物。非洲南部蛋白质含量最高的甘薯基因型是紫 - 紫（28.81克/100克）和‘08 - 21P’（24.31克/100克）。一份13.65克的‘2019 - 1 - 1’能满足男性铁的推荐膳食摄入量（RDA），25.59克能满足儿童的RDA，30.72克能满足女性的RDA。基因型‘2019 - 1 - 1’的甘薯根每天为儿童提供31.43克锌，为成年人提供22.86克锌。当地品种紫 - 紫的根可作为功能性食品成分。
