Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; School of Electronic Information Engineering, Yangtze Normal University, Chongqing, 408100, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Mar 5;228:117736. doi: 10.1016/j.saa.2019.117736. Epub 2019 Nov 3.
A rapid method for detecting fatty acids (FAs) using terahertz time-domain spectroscopy (THz-TDS) technology combined with a metamaterial-based THz sensor was developed. We measured the THz responses to oleic acid, linoleic acid and α-linoleic acid with different numbers of double-bond, α-linoleic acid and γ-linoleic acid with different conformations. In addition, in order to explore the reason for the observed redshifts of the resonance frequencies of the four FAs, the dielectric constants of the FAs were measured in the THz region. Furthermore, the four fatty acids were also attempted to be identified by Raman spectroscopy, which was difficult to accomplish unambiguously because of the effect of fluorescence. This result thus demonstrates the power and usefulness of metamaterial-assisted THz-TDS in the rapid determination of the FAs, and its potential as a versatile tool for investigation of biological metabolism, and for food product quality, safety inspection and control.
本文提出了一种利用太赫兹时域光谱（THz-TDS）技术结合基于超材料的太赫兹传感器快速检测脂肪酸（FAs）的方法。我们测量了具有不同双键数的油酸、亚油酸和α-亚麻酸，以及具有不同构象的α-亚麻酸和γ-亚麻酸的太赫兹响应。此外，为了探究观察到的四种 FAs 共振频率红移的原因，我们在太赫兹区域测量了 FAs 的介电常数。此外，还尝试通过拉曼光谱对这四种脂肪酸进行鉴定，但由于荧光的影响，这项工作难以明确完成。因此，该结果表明超材料辅助 THz-TDS 在快速测定 FAs 方面具有强大的作用和实用性，以及其作为一种通用工具，可用于研究生物代谢、食品产品质量、安全检测和控制。
