Highly Selective Molecularly Imprinted Electrochemiluminescence Sensor Based on Perovskite/Ru(Bpy)32+ for Simazine Detection in Biological Samples
0
Citation
0
Reference
10
Related Paper
Abstract:
A novel molecularly imprinted electrochemiluminescence (MIECL) sensor based on the luminescence of molecularly imprinted polymer-perovskite (MIP-CsPbBr 3 ) layer and Ru(bpy) 3 2+ was fabricated for simazine detection. MIP-CsPbBr 3 layers were immobilized onto the surface of glassy carbon electrode as the capture and signal amplification probe, and Ru(bpy) 3 2+ and co-reactant tripropylamine exhibited stronger electrochemiluminescence (ECL) emission. Under optimal conditions, the ECL signal of the MIECL sensor was linearly quenched, with the logarithm of simazine concentration ranging from 0.1 μg/L to 500.0 μg/L, correlation coefficient of 0.9947, and limit of detection of 0.06 μg/L. The practicality of the developed MIECL sensor method for simazine determination in biological samples was validated. Excellent recoveries of 86.5%–103.9% with relative standard deviation below 1.6% were obtained for fish and shrimp samples at three different spiked concentrations. The MIECL sensor exhibited excellent selectivity, sensitivity, reproducibility, accuracy, and precision for simazine determination in actual biological samples.Keywords:
Electrochemiluminescence
Simazine
Molecularly imprinted polymer
Abstract The relative toxicities of simazine and atrazine to various crops were investigated. Out of the seven crops studied wheat and mustard were found to be the crops most susceptible to simazine and atrazine, respectively. Pea and gram appeared comparatively tolerant to both the herbicides.
Simazine
Triazine
Cite
Citations (5)
Summary. Evidence is presented that blackcurrants show a considerable tolerance to simazine when the entire root system is exposed to a uniform concentration of the herbicide in sand and water culture. The tolerance of this species under field conditions does not therefore seem to be primarily due to root development being limited in the surface soil to which simazine is applied. Accordingly, experiments were carried out using simazine, labelled in the ring with 14 C, to determine whether there were restrictions to the uptake of the herbicide by the roots and its translocation to the xylem sap and leaves, and whether there was extensive breakdown of simazine in the plant. The results of these experiments are compared with those on two susceptible species, barley and marrow. Although simazine appeared to be metabolized to a greater extent in blackcurrants, and was less readily translocated from the roots, than in the susceptible species, a substantial proportion of the labelled material in the leaves was present as unchanged simazine. Studies on the effects of simazine on the rate of transpiration of detached leaves of the three species suggested that in blackcurrants there was a restriction to movement of the herbicide from the conducting tissue in the leaves to the mesophyll; this was confirmed by autoradiographs. It is suggested that this restriction, combined with partial breakdown of the herbicide in the leaves, may be responsible for the tolerance of blackcurrants to simazine. Résistance du cassissier à la simazine
Simazine
Cite
Citations (11)
Simazine (2-chloro-4, bis ethylamino-1,3,5-triazine) is a herbicide of the s-triazine group used mainly to control broad-leaved weeds in different crops. Several papers report about simazine and other s-triazine derivates as being actual polluting agents. In fact, simazine has been detected in groundwater and soil. Since this herbicide has been extensively used in Andalusia (south of Spain), we are analyzing the levels of simazine residues found in the soil of olive fields. We are also simazine could be detected isolating live micro organisms able to degrade this compound, and are characterizing the metabolic pathways leading to this degradation and the fate of this compound in nature. With all these data in mind, we will try to develop a strategy for the bioremediation of contaminated soils. We have taken samples of soil from many olive orchards of Andalusia that have been treated with simazine. These samples were located with the help of a handheld GPS. The presence of simazine of these samples was detected by HPLC. In most of the samples taken no, and those where it could be, contained very low levels of this herbicide (lower than 0.5 ppm). Soil samples are being characterized to determine their physicochemical characteristics [pH, organic matter, texture, etc), and we are attempting to correlate all these parameters with the presence or absence of simazine. From some of the soils, we have isolated a group of micro organisms that can grow using simazine as the sole carbon and nitrogen sources. We are analyzing how the addition of carbon or nitrogen can influence the rate of the simazine degradation.
Simazine
Triazine
Cite
Citations (2)
Simazine
Cite
Citations (54)
Doveweed is a summer annual that is difficult to control in turfgrass. Photosystem II inhibitors have the potential to control doveweed, but research is limited on the efficacy of these herbicides. The objectives of this research were to evaluate (1) the differential tolerance levels of doveweed to atrazine and simazine, (2) the influence of application placement and rate on herbicide efficacy, and (3) uptake and metabolism of these herbicides in doveweed. In greenhouse experiments, the time required to injure doveweed 50% was three to five times faster for atrazine than simazine. Simazine soil or foliar + soil application reduced doveweed biomass 77% from the nontreated, but foliar-only treatments reduced biomass 51%. Application placements for atrazine equally reduced shoot biomass 96% from the nontreated. In a dose–response experiment, atrazine and simazine required ≤ 1.8 kg ha −1 and ≥ 5.1 kg ha −1 to injure doveweed 50% from 8 to 16 d after treatment (DAT), respectively. Doveweed required 79% less atrazine to reduce biomass 50% from the nontreated compared with simazine. In laboratory experiments, doveweed had similar root absorption levels of 14 C-atrazine and 14 C-simazine. Metabolism of both herbicides linearly increased from 1 to 7 DAT, but parent herbicide levels averaged 39 and 25% of the extracted radioactivity from 14 C-atrazine and 14 C-simazine, respectively. Doveweed metabolized 14 C-simazine to three major metabolites, including hydroxysimazine, that each ranged from 24 to 29% of the extracted radioactivity. Hydroxyatrazine was the only major metabolite (> 10% of total 14 C extracted) of 14 C-atrazine. Overall, doveweed has slower metabolism of atrazine compared with simazine and is the basis for differential tolerance levels to these herbicides.
Simazine
Cite
Citations (13)
No simazine residues were found in strawberry fruit from plants to which simazine had been applied for weed control 1 year previously. About 14% of the simazine remained in the soil, to which up to 4.48 kg/ha had been applied 15 months previously.
Simazine
Fragaria
Cite
Citations (3)
Abstract An electrochemiluminescence inhibition method has been developed for the determination of bisphenol A based on studying the inhibition phenomena of bisphenol A to the electrochemiluminescence of luminol. There is a linear relationship between the inhibitive intensity of electrochemiluminescence and the concentration of bisphenol A in the range of 4.4 × 10 −7 to 2.2 × 10 −5 mol/l. The method was successfully applied to the determination of bisphenol A in hot water in contact with commercially available table‐water bottle samples.
Electrochemiluminescence
Luminol
Bisphenol S
Cite
Citations (14)
Electrochemiluminescence
Molecularly imprinted polymer
Linear range
Electrochemical gas sensor
Glassy carbon
Cite
Citations (14)
Simazine
Lolium rigidum
Cite
Citations (83)
Based on Ru(bpy)32+-Au nanoparticles decorated multi-walled carbon nanotubes composites and a molecularly imprinted polymer (MIP), we propose a novel molecularly imprinted electrochemiluminescence (ECL) sensor to selectively determine isoniazid (INH). The MIP is synthesized through electrochemical copolymerization of acrylamide and N,N′-methylene diacrylamide in the presence of INH template molecules. The enhanced ECL intensity is linear in the range of 0.1 to 110 μg cm−3 and the detection limit is 0.08 μg cm−3 (3σ) INH with relative standard deviation 3.8% (n = 6) for 8 μg cm−3. As a result, the sensor has been successfully applied to the determination of INH in human urine and pharmaceutical samples. Moreover, the possible ECL mechanism is discussed.
Electrochemiluminescence
Cite
Citations (53)