Abstract Functional foods are products focused to human consumption with benefits to different physiologic aspects in order to prevent diverse metabolic problems in the body. Prebiotics recently have been started to be employed as functional foods, and fructans as inulin or agave inulin, known as agavin, represent a valuable source of them. Standard polysaccharides as starch, inulin, cellulose and agavin were vibrationally analyzed by FTIR spectroscopy, as well as solid mixtures with different agavin-cellulose and agavin-cocoa ratios, to identify important absorption peaks to detect evolutive changes of bands in absorbance intensities and wavenumbers displacements, in order to employ this information for possible adulteration in this prebiotic functional foods. Three commercial products identified as supplemented agavins with Aloe vera, antioxidants and cocoa were vibrationally analyzed and described by comparative visualization with standard solid mixtures for detecting discrepancies with ingredient compositions. The vibrational patterns displayed by standard polysaccharides allowed to identify frequency zones for making an approach to elucidate standards; furthermore, solid mixtures of standards described the evolution of absorption peaks proportionally to the ratio of the samples. Spectra of agavin-cellulose and agavin-cocoa solid mixtures exhibited an increment in bands associated with C–O and C–O–C between 1176 cm−1 and 1074 cm−1 when the agavin content diminished in the mixture; an opposite behavior was depicted at 926 cm−1 absorption band, intensity decreased when the agavin ratio decreased. The spectra of commercial agavins provided the information to identify structural similarities with the absorption bands shown by polysaccharide standards, which made it possible to identify the presence of the components of interest.

中文翻译：

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补充 agavin 作为功能性食品的 FTIR 比较研究

摘要 功能性食品是专注于人类消费的产品，具有不同生理方面的益处，以防止体内各种代谢问题。益生元最近已开始用作功能性食品，果聚糖如菊粉或龙舌兰菊粉（称为 agavin）代表了它们的宝贵来源。通过 FTIR 光谱对淀粉、菊粉、纤维素和龙舌兰素等标准多糖以及具有不同龙舌兰素-纤维素和龙舌兰素-可可比例的固体混合物进行振动分析，以确定重要的吸收峰，以检测吸收强度和波数位移谱带的演化变化, 以便将此信息用于这种益生元功能食品中可能掺假的情况。三种商业产品被确定为含有芦荟的补充剂，通过与标准固体混合物的比较可视化对抗氧化剂和可可进行振动分析和描述，以检测成分组成的差异。标准多糖显示的振动模式允许识别频率区域，以制定阐明标准的方法；此外，标准的固体混合物描述了吸收峰的演变与样品的比例成正比。当混合物中的 agavin 含量减少时，agavin-纤维素和 agavin-可可固体混合物的光谱在 1176 cm-1 和 1074 cm-1 之间显示出与 C-O 和 C-O-C 相关的谱带增加；在 926 cm-1 吸收带处描绘了相反的行为，当龙舌兰素比率降低时强度降低。