Highly Sensitive and Rapid Surface Enhanced Raman Spectroscopic (SERS) Determination of Thiram on the Epidermis of Fruits and Vegetables Using A Silver Nanoparticle-Modified Fibrous Swab
Highly Sensitive and Rapid Surface Enhanced Raman Spectroscopic (SERS) Determination of Thiram on the Epidermis of Fruits and Vegetables Using A Silver Nanoparticle-Modified Fibrous Swab
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使用银纳米颗粒改性纤维拭子高灵敏快速表面增强拉曼光谱 (SERS) 测定水果和蔬菜表皮上的福美双
DOI：
10.1080/00032719.2019.1687509
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发表时间：
2020-04
影响因子：
2
通讯作者：
Wang Changshun
中科院分区：
文献类型：
--
作者：
Sun Lili;Wang Changshun
摘要 通过结合纳米银（AgNP）和纤维拭子，开发了一种用于快速测定农药残留的高灵敏度表面增强拉曼光谱（SERS）基底。 SERS 基底的制备方法很简单，即通过浸泡-吸收方法在纤维拭子和离心管的截面上形成 SERS 活性区域。采用常见的SERS探针分子罗丹明6 G（R6G）对所制备的SERS底物进行性能表征，结果显示其灵敏度高、稳定性好、重现性好。由于其良好的柔韧性，所制备的SERS基底可用于擦拭污染表面以提取残留物。验证了福美双检测痕量农药的高灵敏度。经计算，福美双在苹果、葡萄和茄子表皮上的检出限（LOD）分别低至0.5313、0.5768和0.5495 ng·cm−2，比中国食品安全国家标准颁布的食品中农药最大残留限量（MRL）低近2个数量级。此外，这三个样品中的SERS强度与福美双浓度之间存在线性关系，表明该底物在定量SERS分析方面具有良好的潜力。
Abstract A surface enhanced Raman spectroscopy (SERS) substrate with high sensitivity for the rapid determination of pesticide residues was developed by combining silver nanoparticles (AgNPs) and a fibrous swab. The SERS substrate was prepared simply by forming a SERS-active area on the section of fibrous swab and centrifuge tube with a soak-absorb approach. Rhodamine 6 G (R6G), a common SERS probe molecule, was used for performance characterization of the prepared SERS substrate that was shown to have high sensitivity, good stability and good reproducibility. Due to its good flexibility, the prepared SERS substrate was used to wipe contaminated surfaces for residue extraction. High sensitivity for detecting trace-level pesticides was verified for thiram. The limits of detection (LODs) for thiram on apple, grape and eggplant epidermis were calculated to be as low as 0.5313, 0.5768, and 0.5495 ng·cm−2, respectively, nearly 2 orders of magnitude below the maximum residue limit (MRL) for pesticide in food issued by the National Food Safety Standard of China. In addition, there was a linear relationship between the SERS intensity and the concentration of thiram in these three samples, indicating the good potential of this substrate for quantitative SERS analysis.
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