Sweet potato is one of the oldest crops cultivated in Mexico, and Mesoamerica is considered as a region with the greatest diversity of this species. Therefore, the present study focused on the evaluation of biologically active compounds, such as caffeoylquinic acid derivatives and flavonoid compounds, in sweet potato leaves of 200 accessions of the main producing regions of Mexico. The analysis of total phenol content (TPC) showed a great variability of concentrations among the examined accessions (54.41 to 284.64 mgTPC/g DW). Likewise, total flavonoid content (TFC) was determined and ranged from 10.01 to 40.17 mgTFC /g DW. Finally, total anthocyanin content (TAC) was evaluated and concentrations obtained varied from 0.05 to 0.98 mgTAC/g DW. Additionally, HPLC analysis of all 200 accessions demonstrated the presence of caffeic acid (CA), 5-caffeoylquinic acid (5-CQA), three isomers of di-caffeoylquinic acid (di-CCA) and 4-feruloyl-5-caffeoylquinic acid (4F-5CQA) in all test samples. Only 21 accessions tested showed the quantitative amount of 3,4,5-tri-caffeoylquinic acid (3,4,5-tri-CQA) with concentrations ranging from 44.73 to 193.22 mg/100 g DW and high content of 4F-5CQA (139.46 to 419.99 mg/100 g DW). The gathered data indicate that leaves of Mexican sweet potatoes are a promising source of phenolic compounds with remarkable nutraceutical potential.

中文翻译：

---

墨西哥甘薯种质叶中生物活性化合物的定量分析：酚类、黄酮类、花青素、3,4,5-三-咖啡酰奎宁酸和 4-阿魏酰-5-咖啡酰奎宁酸

甘薯是墨西哥最古老的作物之一，中美洲被认为是该物种多样性最大的地区。因此，本研究的重点是评价墨西哥主产区 200 份甘薯叶中的生物活性化合物，如咖啡酰奎宁酸衍生物和黄酮类化合物。总酚含量 (TPC) 的分析表明，受检种质之间的浓度差异很大（54.41 至 284.64 mgTPC/g DW）。同样，测定了总黄酮含量 (TFC)，其范围为 10.01 至 40.17 mgTFC /g DW。最后，评估了总花青素含量 (TAC)，获得的浓度范围为 0.05 至 0.98 mgTAC/g DW。此外，所有 200 份样品的 HPLC 分析表明存在咖啡酸 (CA)，所有测试样品中均含有 5-咖啡酰奎宁酸 (5-CQA)、二-咖啡酰奎宁酸 (di-CCA) 和 4-阿魏酰-5-咖啡酰奎宁酸 (4F-5CQA) 的三种异构体。只有 21 个测试的种质显示了 3,4,5-三-咖啡酰奎宁酸 (3,4,5-tri-CQA) 的定量含量，浓度范围为 44.73 至 193.22 mg/100 g DW 和高含量的 4F-5CQA（ 139.46 至 419.99 毫克/100 克干重）。收集到的数据表明，墨西哥红薯的叶子是酚类化合物的有希望的来源，具有显着的营养潜力。22 mg/100 g DW 和高含量的 4F-5CQA（139.46 至 419.99 mg/100 g DW）。收集到的数据表明，墨西哥红薯的叶子是酚类化合物的有希望的来源，具有显着的营养潜力。22 mg/100 g DW 和高含量的 4F-5CQA（139.46 至 419.99 mg/100 g DW）。收集到的数据表明，墨西哥红薯的叶子是酚类化合物的有希望的来源，具有显着的营养潜力。