Molecularly imprinted polymer coated on stainless steel fiber for solid-phase microextraction of chloroacetanilide herbicides in soybean and corn.
A molecularly imprinted polymer (MIP) with metolachlor as template was firstly coated on stainless steel fiber through chemical bonding strategy to solve the fragility problem of silica fiber substrate for solid-phase microextraction. The surface pretreatment of stainless steel fiber and the polymerization conditions were investigated systematically to enhance the preparation feasibility and MIP coating performance, and then a porous and highly cross-linked MIP coating with 14.8-microm thickness was obtained with over 200 times re-usability which was supported by non-fragile stainless steel fiber adoption. The MIP coating possessed specific selectivities to metolachlor, its metabolites and other chloroacetanilide herbicides with the factors of 1.1-4.6. Good extraction capacities of metolachlor, propisochlor and butachlor were found with MIP coating under quick adsorption and desorption kinetics, and the detection limits of 3.0, 9.6 and 38 microg L(-1) were achieved, respectively. Moreover, the MIP-coated stainless steel fiber was evaluated for trace metolachlor, propisochlor and butachlor extraction in the spiked soybean and corn samples, and the enrichment factors of 54-60, 27-31 and 15-20 were obtained, respectively.
Hu
Xiaogang
X
School of Chemistry and Environment, South China Normal University, Guangzhou 510631, China. huxg@scnu.edu.cn
Dai
Guimei
G
Huang
Jiajing
J
Ye
Tingting
T
Fan
Huajun
H
Youwen
Tang
T
Yu
Ying
Y
Liang
Yong
Y
D000081:Acetamides / Q000737:chemistry / Q000302:isolation & purification*; D000083:Acetanilides / Q000737:chemistry / Q000302:isolation & purification; D000327:Adsorption; D017743:Equipment Reuse; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D054802:Molecular Imprinting / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052617:Solid Phase Microextraction / Q000379:methods*; D013025:Glycine max / Q000737:chemistry*; D013193:Stainless Steel / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry*
D000081:Acetamides; D000083:Acetanilides; D013193:Stainless Steel; C078188:2-chloro-N-(ethoxymethyl)-N-(2-methyl-6-(trifluoromethyl)phenyl)acetamide; C470819:propisochlor; C054409:butachlor; C051786:metolachlor