Surface-enhanced Raman spectroscopy (SERS) was used to simply and sensitively detect the artificial sweetener aspartame added to purified water. In this paper, a cavity formed spontaneously by silver ion droplets, and liquid polydimethylsiloxane (PDMS) is used as an SERS substrate to integrate plasma nanoparticles into optical devices. Firstly, Raman spectral characteristics of aspartame powder and aspartame aqueous solution were analyzed. Secondly, the effect of aspartame content in purified water on SERS intensity was investigated by using the prepared PDMS plasma cavity to test the samples. Thirdly, the SERS calibration curve was established by using the characteristic peak intensity of aspartame, and a good linearity relationship between the concentration of aspartame added in purified water and the characteristic peak intensity of 1588(±5) cm-1 was obtained. The linear regression equation and correlation coefficient (r) were y = 11412.73874 x + 107.36722 and 0.99593, respectively. The average recovery of aspartame in purified water was 101–106%, and the relative standard deviation (RSD) was 0.121–0.496%. The experimental results show that using this method can detect aspartame in purified water correctly, which is expected to be used in the identification and detection of sweeteners in purified water.

中文翻译：

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使用PDMS等离子体腔SERS底物检测阿斯巴甜

使用表面增强拉曼光谱（SERS）来简单，灵敏地检测添加到纯净水中的人造甜味剂阿斯巴甜。在本文中，由银离子液滴自发形成的腔体和液态聚二甲基硅氧烷（PDMS）被用作SERS衬底，以将等离子体纳米颗粒整合到光学器件中。首先，分析了阿斯巴甜粉和阿斯巴甜水溶液的拉曼光谱特性。其次，通过使用制备的PDMS等离子体腔来测试样品，研究了纯净水中的阿斯巴甜含量对SERS强度的影响。第三，利用阿斯巴甜的特征峰强度建立SERS校正曲线，得到的纯净水中阿斯巴甜浓度与特征峰强度1588（±5）cm-1之间具有良好的线性关系。线性回归方程和相关系数（r）分别为y  = 11412.73874 x  + 107.36722和0.99593。纯净水中阿斯巴甜的平均回收率为101–106％，相对标准偏差（RSD）为0.121–0.496％。实验结果表明，该方法能够正确检测纯净水中的阿斯巴甜，有望用于纯净水中甜味剂的鉴定和检测。