基于柔性SERS基底拉曼光谱法快速检测水果表面的福美双

Rapid detection of thirm on fruit surface based on flexible surface-enhanced Raman scattering substrate

采用海胆状金纳米粒子(GNUs)柔性表面增强拉曼散射(SERS)基底,检测了水果表皮的福美双残留。GNUs表面尖锐的突起能够极大增强周围电磁场,提高检测灵敏度。与普通柔性基底相比,这种高粘性的SERS基底具有不易老化和不易脱胶等优点。评估了SERS基底的灵敏度、重现性和稳定性。通过简单的"粘贴-剥离"法,利用组装的柔性基底对雪花梨表面的福美双残留进行了原位检测。在1×10^(-10)~1×10^(-4)mol/L范围内,雪花梨表面的福美双浓度的对数与SERS强度呈线性关系,GNUs柔性基底对福美双的检测限为92 pmol/L,方法可用于食品安全、环境检测、公共安全等领域。

This paper reported a SERS-based flexible substrate comprising gold nanourchins(GNUs)for thiram residue detection on fruit surface.Many protrusions and tips on GNUs surface have been proven to produce strong local electromagnetic field enhancement,which can improve the detection sensitivity.Meanwhile,compared with normal flexible substrate,this high viscosity SERS substrate possesses the advantage of lowest aging and degumming.The sensitivity,reproducibility and stability of this SERS substrate were evaluated.The thiram residue on the snow pear surface with the assembled flexible substrate by a simple"paste-peel"method was detected successfully.The results indicated that the relationship between the logarithm of the thiram concentrations on the sample and SERS intensities was linear in the thiram concentration range of 1×10^(-10)-1×10^(-4)mol/L.The detection of limit was 92 pmol/L.This method owns potential application prospect in the field of food safety,environmental monitoring and public security.