Nondestructive Detection of Chlorpyrifos in Apples Based on Surface Enhanced Raman Scattering

Zhai, Chen; Peng, Yankun; Li, Yongyu; Xu, Tao

doi:10.6023/a15050326

Cited by 10 publications

(10 citation statements)

References 14 publications

(14 reference statements)

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“…The detection limit of carbendazim was estimated to be 0.014 mg/kg. In our previous study, the minimum of the quantitative prediction of chlorpyrifos could reach 0.064 mg/kg . The SERS method used in the present study is thought to be a fast way for the quantification of pesticide residues because it omits the preprocessing step and takes only few minutes for spectra collection.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous study, the minimum of the quantitative prediction of chlorpyrifos could reach 0.064 mg/kg. [29] The SERS method used in the present study is thought to be a fast way for the quantification of pesticide residues because it omits the preprocessing step and takes only few minutes for spectra collection. During our actual operation it takes less than 10 min to determine the pesticide residual content, which is much faster when compared to conventional chromatographic methods (20 min to 2 h).…”

Section: Sers Signals Interaction Of Different Pesticides In Their MImentioning

confidence: 99%

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Extraction and identification of mixed pesticides' Raman signal and establishment of their prediction models

Zhai

Peng

et al. 2016

J Raman Spectroscopy

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A nondestructive and sensitive method is developed to determine mixed pesticides of acetamiprid, chlorpyrifos and carbendazim in apple samples by surface‐enhanced Raman spectroscopy (SERS). Self‐modeling mixture analysis (SMA) was used to identify and extract the Raman signals of each pesticide from the spectra of apples contaminated with mixed pesticides. Results indicate that the obtained SERS signal intensities of each pesticide in their mixture have no obvious difference to the signal intensities of the corresponding pure pesticide at a low concentration. The lowest detectable level of acetamiprid, chlorpyrifos and carbendazim in apple are 0.0054 mg/kg, 0.064 mg/kg and 0.014 mg/kg, respectively, which are sensitive enough for identifying apple contaminated with pesticides above the maximum residue limit. The predicted values of each pesticide in their mixture are obtained using the prediction model based on the Raman signal of the single pesticide. The correlation coefficients of predicted values and actual values are 0.893 for acetamiprid, 0.926 for chlorpyrifos and 0.938 for carbendazim, respectively. The method presents the ultrasensitive SERS performance for quantifying residual pesticides in apple samples without sample pre‐treatment, showing great potential to serve as a useful means for monitoring pesticide residues used in mixed state. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Section: Sers Signals Interaction Of Different Pesticides In Their MImentioning

confidence: 99%

Extraction and identification of mixed pesticides' Raman signal and establishment of their prediction models

Zhai

Peng

et al. 2016

J Raman Spectroscopy

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“…图 1e 为 g-C 3 [20] . [22,23] 和 g-C 3 N 4 纳米片协同作用, 导致在 300～ 700 nm 左右处吸收峰有明显的增强, 拓宽了 SPR 的吸收范围. g-C 3 N 4 /Ag 纳米复合材料与 Ag 纳米粒子的差谱图可以看到 428 nm 到 700 nm 范围内有很强的吸收.…”

Section: 引言unclassified

Trace Detection of Rhodamine B in Infant Candy by g-C₃N₄/Ag Nanocomposite as Surface-Enhanced Raman Scattering Substrate

Ma¹,

Wu²,

Zhu³

et al. 2019

Acta Chim. Sinica

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摘要近年来, 由婴幼儿食品中存在非法添加剂所引起的食品安全问题已经受到了广泛的关注. 表面增强拉曼散射 (SERS)技术可以对食品中被禁止添加的常用染料分子罗丹明 B (RhB)进行快速无损超灵敏的检测. 通过在类石墨相氮化碳(g-C 3 N 4)纳米片上组装 Ag 纳米粒子的方式构筑了 g-C 3 N 4 /Ag 复合材料, 并采用透射电子显微镜(TEM)、紫外可见近红外分光光度计(UV-Vis)、X 射线衍射仪(XRD)、荧光光谱仪和共聚焦显微拉曼光谱仪(Raman)对复合材料的形貌和结构进行了表征. g-C 3 N 4 纳米片不仅具有高度的离域 π 共轭体系和良好的吸附染料分子的性能, 而且可以作为 Ag 纳米粒子的载体, 使 Ag 纳米粒子均匀稳定地分散在其表面. 通过控制实验条件, 优化了测试过程中的 pH 及基底与 RhB 的结合时间, 详细探究 pH 对基底表面等离子共振的影响和对探针分子 SERS 强度的影响.

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“…为了获得均匀的 SERS 基底, 目前研究者发展了多种基底的制备方法, 如液液两相界面成膜 [16] 、多材料复合等方式 [17,18] 提高 SERS 基底的活性和均匀性. 此外, 研究者还提出利用数学模型的方法消除实验中的误差提高了 SERS 定量分析的可能性 [19] , 但这些方法仍存在一定的局限, 如过程较为复杂或价格高昂等. 本工作基于种子生长法制备单分散性良好的金纳米粒子, 利用气-液界面成膜的方式获得均匀的金纳米粒子单层膜(Au monolayer film, Au MLF)构建 SERS 基底, 获得了均匀且致密的 Au MLF.…”

Section: 用unclassified

In situ SERS Investigation of SPR-driven Catalytic Reactions on Au Nanoparticles Monolayer Film

Chenjie¹,

Zhang²,

Lin³

et al. 2017

Acta Chim. Sinica

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The activity and uniformity of surface-enhanced Raman scattering (SERS) effect has been already become the critical role for fundamental research and practical application. Herein, Au nanoparticle monolayer films (Au MLF) were fabricated based on the self-assembly of nanoparticles at the air/water interface by introduction of polyvinylpyrrolidone (PVP) as additional agent. The change of assembly duration allowed the formation of Au MLFs with different density. Due to the excitation mode and intensity of localized surface plasmon resonance (LSPR) varying with the nanoparticle density, the activity and uniformity of SERS substrate could not be taken into account at the same time. For example, loose Au MLF exhibited excellent SERS and catalytic performance but poor uniformity, while compact Au MLF held excellent uniformity and reasonable SERS and catalytic performance. It demonstrated that the intensity of SERS signal was not only relevant to the activity but also to the number of "hot spots", while the conversion rate of surface plasmon resonance (SPR) induced catalysis was only associated with the activity of "hot spots". By using the compact film with relative standard deviation of SERS intensity and SPR catalytic efficiency less than 5% and 6% as the SERS substrate, the influence of the external environment on the SPR catalytic reaction was clarified. In this paper, the effect of laser power on the efficiency and reaction rate of SPR induced catalytic reaction was investigated according to the coupling reaction of para-aminothiophenol (PATP) and decarboxylation process of 4-mercaptobenzoic acid (MBA). It was found that the increase of laser power not only improved the efficiency of SPR catalytic reaction, but also accelerated the reaction rate from the perspective of reaction kinetics due to the heat effect and hot electrons generated by SPR. The results indicated that the rate of the SPR catalytic reaction was linear with the reciprocal of the square of the laser power. It provided a new approach for the determination of the kinetic parameters of the related surface processes. Keywords surface-enhanced Raman scattering (SERS); Au monolayer film; plasmon catalyzed surface reaction; laser power; decarboxylation reaction

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Nondestructive Detection of Chlorpyrifos in Apples Based on Surface Enhanced Raman Scattering

Cited by 10 publications

References 14 publications

Extraction and identification of mixed pesticides' Raman signal and establishment of their prediction models

Extraction and identification of mixed pesticides' Raman signal and establishment of their prediction models

Trace Detection of Rhodamine B in Infant Candy by g-C₃N₄/Ag Nanocomposite as Surface-Enhanced Raman Scattering Substrate

In situ SERS Investigation of SPR-driven Catalytic Reactions on Au Nanoparticles Monolayer Film

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Nondestructive Detection of Chlorpyrifos in Apples Based on Surface Enhanced Raman Scattering

Cited by 10 publications

References 14 publications

Extraction and identification of mixed pesticides' Raman signal and establishment of their prediction models

Extraction and identification of mixed pesticides' Raman signal and establishment of their prediction models

Trace Detection of Rhodamine B in Infant Candy by g-C3N4/Ag Nanocomposite as Surface-Enhanced Raman Scattering Substrate

In situ SERS Investigation of SPR-driven Catalytic Reactions on Au Nanoparticles Monolayer Film

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Trace Detection of Rhodamine B in Infant Candy by g-C₃N₄/Ag Nanocomposite as Surface-Enhanced Raman Scattering Substrate