Biomedical Engineering Reference
In-Depth Information
(
A
)
Modification
SiO
2
MPTS
MPTS-SiO
2
(
B
)
Prearrangement
MSM
(Template molicule)
MAA
(Monomer)
Template-monomer complex
(
C
)
Polymerization
Cross-linker
initiator
MPTS-SiO
2
Template-monomer complex
Further aging
(Programed heating)
Removal of MSM
Rebinding MSM
SiO
2
@MSM-MIP
Figure 11.12
Schematic representation of MPTS modii cation of silica nanoparticles
(A), prearrangement of MSM and MAA (B), and preparation of SiO
2
@MSM-MIP
nanoparticles (C) [Co-opted from reference 31 with permission].
of rebinding capacity. At er removal of templates, recognition sites of met-
sulfuron-methyl were exposed in the polymer layers.
As a result, the maximum rebinding capacity was achieved with the use
of optimal grat ing ratio. h ere was also evidence indicating that the met-
sulfuron-methyl-imprinted polymer nanoparticles compared with non-
imprinted polymer nanoparticles had a higher selectivity and ai nity to
four structure-like sulfonylurea herbicides. Moreover, using the imprinted
particles as dispersive solid phase extraction materials, the recoveries of
four sulfonylurea herbicides determined by high performance liquid chro-
matography (HPLC) were 80.2-99.5%, 83.8-102.4%, 77.8-93.3%, and
73.8-110.8% in the spiked soil, rice, soybean, and corn samples, respec-
tively. h ese results show the possibility that the highly selective separa-
tion and enrichment of trace sulfonylurea herbicides from soil and crop
