Preparation of Magnetic Molecularly Imprinted Polymer for Melamine and its application in milk sample analysis by HPLC

Qi, Yuxia; Li, Guanyu

doi:10.4172/2254-609x.100030

Cited by 12 publications

(7 citation statements)

References 21 publications

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“…The XRD spectrum of MY in the 2θ range of 20 to 80 • is shown in Figure 3, where the (220), (311), (400), ( 422 was successfully loaded onto the yeast surface during the production of MY and that, subsequently, surface molecular imprinting did not change the crystalline structure of magnetic nanoparticles. Similar patterns confirming the effective loading of magnetite have been reported in the literature on magnetic MIPs (MMIPs), including MMIPs produced for melamine analysis in milk [42], PEGylated magnetic core−shell structure-molecularly imprinted polymers (PMMIPs) for the specific adsorption of bovine serum albumin (BSA) [43], or core−shell MMIPs for the selective adsorption of tetracycline [44]. The thermogravimetric (TG) and derivative thermogravimetric (DTG) curves of MY, MY@NIPs, and MY@MIPs are shown in Figure 4.…”

Section: Characterization Of My My@mips and My@nipssupporting

confidence: 87%

Core−Shell Molecularly Imprinted Polymers on Magnetic Yeast for the Removal of Sulfamethoxazole from Water

et al. 2020

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In this work, magnetic yeast (MY) was produced through an in situ one-step method. Then, MY was used as the core and the antibiotic sulfamethoxazole (SMX) as the template to produce highly selective magnetic yeast-molecularly imprinted polymers (MY@MIPs). The physicochemical properties of MY@MIPs were assessed by Fourier-transform infrared spectroscopy (FT-IR), a vibrating sample magnetometer (VSM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), specific surface area (SBET) determination, and scanning electron microscopy (SEM). Batch adsorption experiments were carried out to compare MY@MIPs with MY and MY@NIPs (magnetic yeast-molecularly imprinted polymers without template), with MY@MIPs showing a better performance in the removal of SMX from water. Adsorption of SMX onto MY@MIPs was described by the pseudo-second-order kinetic model and the Langmuir isotherm, with maximum adsorption capacities of 77 and 24 mg g−1 from ultrapure and wastewater, respectively. Furthermore, MY@MIPs displayed a highly selective adsorption toward SMX in the presence of other pharmaceuticals, namely diclofenac (DCF) and carbamazepine (CBZ). Finally, regeneration experiments showed that SMX adsorption decreased 21 and 34% after the first and second regeneration cycles, respectively. This work demonstrates that MY@MIPs are promising sorbent materials for the selective removal of SMX from wastewater.

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Section: Characterization Of My My@mips and My@nipssupporting

confidence: 87%

Core−Shell Molecularly Imprinted Polymers on Magnetic Yeast for the Removal of Sulfamethoxazole from Water

et al. 2020

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“…The 686 cm −1 peak in SERS spectra of melamine corresponds to the cyclic breathing pattern of melamine (Figure S6A). The LOD of melamine using optimal Au@Ag NS 3D substrate is 82 nM, which is lower than the LOD 118 nM of high-performance liquid chromatography, 31 indicating the optimal Au@Ag NS 3D substrate has quantitative detection ability for biomolecules.…”

Section: Resultsmentioning

confidence: 99%

High Uniformity and Enhancement Au@AgNS 3D Substrates for the Diagnosis of Breast Cancer

Yang

You

et al. 2022

ACS Omega

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Breast cancer appears to be one of the leading causes of cancer-related morbidity and mortality for women worldwide. The accurate and rapid diagnosis of breast cancer is hence critical for the treatment and prognosis of patients. With the vibrational fingerprint information and high detection sensitivity, surface-enhanced Raman spectroscopy (SERS) has been extensively applied in biomedicine. Here, an optimized bimetallic nanosphere (Au@Ag NS) 3D substrate was fabricated for the aim of the diagnosis of breast cancer based on the SERS analysis of the extracellular metabolites. The unique stacking mode of 3D Au@Ag NSs provided multiple plasmonic hot spots according to the theoretical calculations of the electromagnetic field distribution. The low relative standard deviation (RSD = 2.7%) and high enhancement factor (EF = 1.42 × 10 5 ) proved the uniformity and high sensitivity. More importantly, the normal breast cells and breast cancer cells could be readily distinguished from the corresponding SERS spectra based on the extracellular metabolites. Furthermore, the clear clusters of SERS spectra from MCF-7 and MDA-MB-231 extracellular metabolites in the orthogonal partial least-squares discriminant analysis plot indicate the distinct metabolic fingerprint between breast cancer cells, which imply their potential clinical application in the diagnosis of breast cancer.

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“…The adsorbent was separated by centrifugation at 6000 rpm for 10 min and the MG concentration in the supernatant was determined photometrically at 617 nm. Data obtained were fitted to the pseudofirst order (Lagergren 1898;Ghorai et al 2014) and pseudo-second order (Ho and McKay 1999) kinetic models.…”

Section: Time Dependence Studymentioning

confidence: 99%

“…It describes solute uptake rate, which in turn governs the residence time of the reaction (Hema and Arivolis 2008). In evaluating the kinetics of the adsorption of MG onto MIP and NIP, the pseudo-first-order (Lagergren 1898) and the pseudo-second-order (Ho and McKay 1999) kinetic models were used to fit the experimental data (Figures and Table not shown). The values of the correlation coefficient ).…”

Section: Modeling Of the Sorption Processmentioning

confidence: 99%

Adsorption of malachite green onto Styrene-Methacrylate based molecularly imprinted polymer

Awokoya¹,

Oninla²,

Babalola³

et al. 2020

Ife Journal of Science

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The adsorption of malachite green (MG) from aqueous medium by non-imprinted and molecularly imprinted styrene/methacrylate polymers was studied. The synthesized materials were characterized by powder X-ray diffraction, Fourier transform infra-red spectroscopy, scanning electron microscopy, and energy dispersive Xray spectroscopy. The effects of initial dye concentration, contact time and temperature on the adsorption-1 capacity for malachite green were investigated and found to be about 200 g kg for the imprinted polymer and 44-1 g kg for the non-imprinted polymer. The X-ray diffraction peaks at 2θ = 18°, 30° and 42° indicate the crystalline nature of the polymers. Uptake of malachite green increased with rise in contact time and concentration, for both polymers, while decrease in uptake was observed with rise in temperature. The kinetics of the adsorption 2 of the dye on the imprinted polymer followed the pseudo-second order (R = 0.97), while that of the non-2 imprinted polymer followed the pseudo-first order (R = 0.87). Equilibrium study showed that the Freundlich isotherm better describes the adsorption of the dye on both polymers, indicating a multilayer adsorption. The values of ΔG° indicate the spontaneity and non-spontaneity of the dye removal by the imprinted and nonimprinted polymers respectively. The negative ΔH° and ΔS° for the imprinted polymer signify that the process is exothermic and occurred with decrease in the degree of randomness. Thus, the high quantity of MG adsorbed onto the imprinted polymer indicates the high potential of the use of the imprinting technology in the removal of toxic waste from water.

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Preparation of Magnetic Molecularly Imprinted Polymer for Melamine and its application in milk sample analysis by HPLC

Cited by 12 publications

References 21 publications

Core−Shell Molecularly Imprinted Polymers on Magnetic Yeast for the Removal of Sulfamethoxazole from Water

Core−Shell Molecularly Imprinted Polymers on Magnetic Yeast for the Removal of Sulfamethoxazole from Water

High Uniformity and Enhancement Au@AgNS 3D Substrates for the Diagnosis of Breast Cancer

Adsorption of malachite green onto Styrene-Methacrylate based molecularly imprinted polymer

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