Detection of polycyclic aromatic hydrocarbons from cooking oil using ultra-thin layer chromatography and surface enhanced Raman spectroscopy

Chen, Jing; Huang, Yao-Wen; Zhao, Yiping

doi:10.1039/c4tb01632g

Cited by 33 publications

(13 citation statements)

References 32 publications

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“…Additional SERS enhancement can be obtained, similar to our previous work on diatoms biosilica through theoretical calculation and experimental characterization . The ppm level sensitivity that we achieved is comparable with other very advanced platforms developed by Lu and Zhao‘s groups , which require complicate and expensive fabrication processes such as oblique angle deposition and molecularly imprinted technology.…”

Section: Resultssupporting

confidence: 83%

Plasmonic nanoparticles‐decorated diatomite biosilica: extending the horizon of on‐chip chromatography and label‐free biosensing

Kong

Squire

et al. 2017

Journal of Biophotonics

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Diatomite consists of fossilized remains of ancient diatoms and is a type of naturally abundant photonic crystal biosilica with multiple unique physical and chemical functionalities. In this paper, we explored the fluidic properties of diatomite as the matrix for on-chip chromatography and, simultaneously, the photonic crystal effects to enhance the plasmonic resonances of metallic nanoparticles for surface-enhanced Raman scattering (SERS) biosensing. The plasmonic nanoparticle-decorated diatomite biosilica provides a lab-on-a-chip capability to separate and detect small molecules from mixture samples with ultra-high detection sensitivity down to 1 ppm. We demonstrate the significant potential for biomedical applications by screening toxins in real biofluid, achieving simultaneous label-free biosensing of phenethylamine and miR21cDNA in human plasma with unprecedented sensitivity and specificity. To the best of our knowledge, this is the first time demonstration to detect target molecules from real biofluids by on-chip chromatography-SERS techniques.

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Section: Resultssupporting

confidence: 83%

Plasmonic nanoparticles‐decorated diatomite biosilica: extending the horizon of on‐chip chromatography and label‐free biosensing

Kong

Squire

et al. 2017

Journal of Biophotonics

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“…Obviously, some non-targeted ingredients from the chili oil interfered with the interaction between Sudan I molecules and the surface of Au NPs, which affected the bonding strength of the pertinent functional groups (Luo, et al, 2016). The non-targeted ingredients could possibly be oil as it could migrate on the TLC plate during the developing process (Chen, Huang, & Zhao, 2015). When the concentration of Sudan I is down to 1 ppm in chili oil, the featured Raman peaks of Sudan I can still be observed.…”

Section: Resultsmentioning

confidence: 99%

Ultra-sensitive lab-on-a-chip detection of Sudan I in food using plasmonics-enhanced diatomaceous thin film

et al. 2017

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Sudan I is a carcinogenic compound containing an azo group that has been illegally utilized as an adulterant in food products to impart a bright red color to foods. In this paper, we develop a facile lab-on-a-chip device for instant, ultra-sensitive detection of Sudan I from real food samples using plasmonics-enhanced diatomaceous thin film, which can simultaneously perform on-chip separation using thin layer chromatography (TLC) and highly specific sensing using surface-enhanced Raman scattering (SERS) spectroscopy. Diatomite is a kind of nature-created photonic crystal biosilica with periodic pores and was used both as the stationary phase of the TLC plate and photonic crystals to enhance the SERS sensitivity. The on-chip chromatography capability of the TLC plate was verified by isolating Sudan I in a mixture solution containing Rhodamine 6G, while SERS sensing was achieved by spraying gold colloidal nanoparticles into the sensing spot. Such plasmonics-enhanced diatomaceous film can effectively detect Sudan I with more than 10 times improvement of the Raman signal intensity than commercial silica gel TLC plates. We applied this lab-on-a-chip device for real food samples and successfully detected Sudan I in chili sauce and chili oil down to 1 ppm, or 0.5 ng/spot. This on-chip TLC-SERS biosensor based on diatomite biosilica can function as a cost-effective, ultra-sensitive, and reliable technology for screening Sudan I and many other illicit ingredients to enhance food safety.

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“…Further fitting results of the characteristic peaks indicated the capsaicin concentrations of the gutter oil samples (C sample1 = 31 ± 1 mg/L, C sample2 = 33 ± 1 mg/L, and C sample3 = 43 ± 1 mg/L). It is worth mentioning that although we have established a SERS method to identify gutter oil, there are some concerns that some other materials in extract liquor, such as polycyclic aromatic hydrocarbons (PAHs), may affect the results of the test. Although we did not detect PAHs in our gutter oil samples, the characteristic peaks of PAHs and capsaicin do not overlap each other, which also ensures the accuracy of the SERS method.…”

Section: Resultsmentioning

confidence: 99%

Rapid identification of gutter oil by detecting the capsaicin using surface enhanced Raman spectroscopy

Tian

Yao

et al. 2017

J Raman Spectroscopy

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Accurate determination of the gutter oil represents a major food safety challenge. Here, we propose to use the surface enhanced Raman spectroscopy (SERS) with silver nanorod array substrates to detect the capsaicin, a marker of the gutter oil that is difficult to remove. The capsaicin has several characteristic SERS peaks at Δv = 807 cm−1, Δv = 1, 264 cm−1, and so forth, which correspond to the C39‐C37‐C43 stretching vibrational mode at the alkyl chain, the ring stretching vibrational mode, and so forth, confirmed by our density functional theory calculation. This SERS‐based method enabled the rapid and highly sensitive detection of the gutter oil with minimum pretreatment. The concentration dependent SERS investigation shows that the SERS intensity of these characteristic peaks has a linear relationship with the capsaicin concentration when 1 mg/L < C < 60 mg/L. By combining a liquid phase extraction method and the SERS detection strategy, the capsaicin concentration as low as 30 mg/L can be detected from inoculated corn oil samples.

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Detection of polycyclic aromatic hydrocarbons from cooking oil using ultra-thin layer chromatography and surface enhanced Raman spectroscopy

Abstract: The combinatory use of on-chip ultra-thin layer chromatography (UTLC) and surface enhanced Raman spectroscopy (SERS) has been demonstrated to detect mixtures of hazardous food contaminants, polycyclic aromatic hydrocarbons (PAHs), from cooking oil samples.

Cited by 33 publications

References 32 publications

Plasmonic nanoparticles‐decorated diatomite biosilica: extending the horizon of on‐chip chromatography and label‐free biosensing

Plasmonic nanoparticles‐decorated diatomite biosilica: extending the horizon of on‐chip chromatography and label‐free biosensing

Ultra-sensitive lab-on-a-chip detection of Sudan I in food using plasmonics-enhanced diatomaceous thin film

Rapid identification of gutter oil by detecting the capsaicin using surface enhanced Raman spectroscopy

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