Microwave Heating in Preparation of Magnetic Molecularly Imprinted Polymer Beads for Trace Triazines Analysis in Complicated Samples

Abstract

The use of microwave heating for preparation in organic synthesis has been accepted as an effective technique in synthesis due to the significant advantages over the conventional method. In the present work, microwave heating was applied to the preparation of atrazine (template molecule) magnetic molecularly imprinted polymer (mag-MIP) beads by suspension polymerization. The term of the polymerization was dramatically shortened by using microwave heating in polymerization, which was less than (1)/(10) that by conventional heating. The resultant polymers incorporating molecular recognition and magnetic separation can provide a highly selective material for trace analysis in complicated samples. The mag-MIP beads were demonstrated with a narrow diameter distribution (80-250 microm) and cross-linking, spherical shape, and porous morphologies and exhibited magnetic property (M(s) = 0.491 emicro/g) and thermal stability under 260 degrees C. An improvement of imprinted efficiency is obtained in comparison to the mag-MIP beads prepared by conventional heating. A method for the determination of triazines in complicated samples by the mag-MIP beads extraction coupled with high-performance liquid chromatography (HPLC) was developed. The results indicated that the mag-MIP beads can be favorably used for the extraction of the triazines in spiked soil, soybean, lettuce, and millet samples. The reused beads displayed a long-term stability after undergoing extraction of 100 times.

Molecularly imprinted polymers by reversible addition–fragmentation chain transfer precipitation polymerization for preconcentration of atrazine in food matrices

“…However, propazine was a special case, as can be seen from Table 1. This phenomenon also can be seen from a former paper about atrazine MIPs [16]. This may be attributed to the solvent used in the preparation process [24]: solvents also engaged as templates during the imprinting process and affected the binding ability of resultant polymers, and solvent effects on the resultant selectivity have been reported by Hosoya [32].…”

“…Lettuce and corn samples were prepared as reported [16,22]. Briefly, the edible parts of fresh lettuce and corn were taken and crushed into homogenate, then 50 mL ACN was added into 50 g homogenates and incubated for 8 h before filtering.…”

Recent advances in molecular imprinting technology: current status, challenges and highlighted applications

“…Worse still, some EDCs are even suspected to cause human infertility or stunt growth of children. Among those EDCs, hormone drugs, [28][29][30][31] triazine pesticides, [32][33][34][35] and bisphenol A (BPA) 36 are the most widely concerning pollutants used in preparation of MIPs.…”

Synthesis of Mesoporous Fe2o3/SBA-15 and its Application for Nickel (II) Ion Adsorption

“…The new economic material with not only high sustainability but also has a high adsorption capacity urgently to develope in this decade as a solution for the enviromental problem. Currently, mesoporous silica materials attract attention by researchers because it has many advantages such as a high thermel stability, uniform structure, large diameter, high specific surface area and rich with silanol on the framework [11][12][13][14][15][16][17] . The most unique of mesoporous silica is mesoporous silica SBA-15 due to the honeycomb shape structure with diameter size up to 15 nm, pore volume up to 1,5 cm 3 /g and specific surface area up to 2500 m 2 /g [12][13][14][15][16][17][18][19] .…”