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Phytochemical profiles and classification of Agave syrups using 1 H‐NMR and chemometrics

机译：1 H-NMR和化学计量学对龙舌兰糖浆的植物化学特征和分类

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Background Agave syrups are natural sweeteners that are highly desirable for human consumption because they have low glycemic index. In this work, we explored the potential of 1 H‐NMR‐Chemometrics as a useful tool in the identification and differentiation of Agave syrups. Also, we evaluated the phytochemical screening and antioxidant capacity of Agave syrup compared to other natural sweeteners. Results The phytochemical screening stands out for Agave syrups containing higher levels of metabolites with antioxidant activity, mainly saponins, glycosides, and terpenoids. Agave syrup antioxidant activity was in a range from 10% to 53%, while the total phenolic content was from 24 to 300 EAG/100?g, and condensed tannins were between 240 and 1,900?mg CE/g. Additionally, 1 H‐NMR spectroscopy was used to characterize syrup profiles and chemometrics. PCA group analyses allowed the sweeteners’ classification by origin and kind of Agave. Conclusion Thus, we conclude that 1 H‐NMR and chemometrics can be used for identifying, differentiating, and classifying Agave syrups. Besides, Agave syrups contain significant amounts of antioxidative components and can be considered as an effective source of antioxidant.
机译：背景龙舌兰糖浆是天然甜味剂，由于它们具有低的血糖指数，因此是人类食用中非常需要的甜味剂。在这项工作中，我们探索了1 H-NMR-化学计量学作为龙舌兰糖浆鉴定和区分的有用工具的潜力。此外，我们评估了龙舌兰糖浆与其他天然甜味剂相比的植物化学筛选和抗氧化能力。结果植物化学筛选在龙舌兰糖浆中脱颖而出，这些龙舌兰糖浆含有较高水平的具有抗氧化活性的代谢产物，主要是皂苷，糖苷和萜类化合物。龙舌兰糖浆的抗氧化活性范围为10％至5​​3％，总酚含量为24至300 EAG / 100？g，缩合单宁为240至1,900？mg CE / g。此外，1 H-NMR光谱用于表征糖浆分布和化学计量学。 PCA小组分析允许按甜味剂的来源和种类对甜味剂进行分类。结论因此，我们得出的结论是1 H-NMR和化学计量学可用于鉴定，区分和分类龙舌兰糖浆。此外，龙舌兰糖浆包含大量的抗氧化成分，可以被视为有效的抗氧化剂来源。

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