Methyl parathion (MP) and fenthion are both organophosphorus pesticides that have been widely used in agriculture. However, they significantly pollute the environment. A silver nanorod array chip prepared under low temperature conditions was designed to detect the residues of fenthion on the surface of fruit peel and methyl parathion in water. The results show that the characteristic peaks of MP were at 811, 855, 1158, 1236, and 1324 cm − 1 and the characteristic peaks of fenthion were at 853, 1156, 1224, and 1590 cm − 1. The vibrational modes of each peak were calculated using the density function theory. This method can detect MP in different water samples and fenthion on apple peel within 3 min without any complicated pretreatment. The results suggest that the method for rapid determination of organophosphorus pesticides based on surface-enhanced Raman spectroscopy was sensitive and reliable. It is expected that this method has great application potential in environmental pollution monitoring.
Flavin mononucleotide (FMN) plays an important role in living systems. Accurate probing and characterizing of FMN is the key to understanding the contribution of FMN coenzyme in biological processes. We demonstrate a way to get a bright surface-enhanced Raman spectroscopy (SERS) signal while simultaneously quenching the fluorescence background through silver nanorod (AgNR) array substrates fabricated by the oblique angle deposition method. The AgNR array substrates show a good SERS activity with an enhancement factor of ∼4.2 × 104. Meanwhile, the characteristic peaks of FMN are assigned by the density function theory calculation. An exponential relationship is demonstrated between SERS intensity and FMN concentration in the concentration range of 0.1 to 100 mg / L. This SERS-based method enabled the rapid and highly sensitive detection of FMN, holding great promise for expanding SERS application in biochemistry and food safety fields.
Acesulfame potassium (AK) is widely used in the food industry. However, it does harm to the liver and nervous system. Here, a rapid method based on surface-enhanced Raman spectroscopy (SERS) was developed for the detection of AK in mouthwash. As the results show that the characteristic peaks of AK were at 549, 641, and 1650 cm − 1. The vibrational modes of each peak were calculated by density functional theory. This method can detect AK in mouthwash samples within 3 min without any complicated pretreatment. These results suggested that this SERS-based method for rapid determination of AK in mouthwash was sensitive and reliable. It is expected that this method possesses great potential in monitoring the quality of mouthwash.
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