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Imprinted silica nanoparticles coated with N ‐propylsilylmorpholine‐4‐carboxamide for the determination of m ‐cresol in synthetic and real samples
Author(s) -
Ghai Manisha,
Narula Priyanka,
Kaur Varinder,
Singh Raghubir
Publication year - 2015
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201500475
Subject(s) - chemistry , adsorption , nanoparticle , chromatography , selectivity , detection limit , scanning electron microscope , acetonitrile , nuclear chemistry , analytical chemistry (journal) , materials science , catalysis , nanotechnology , organic chemistry , composite material
m ‐Cresol‐imprinted silica nanoparticles coated with N ‐propylsilylmorpholine‐4‐carboxamide have been developed that contain specific pockets for the selective uptake of m ‐cresol. Silica nanoparticles were synthesized by a sol–gel process followed by functionalization of their surface with N ‐propylsilylmorpholine‐4‐carboxamide. The formation of m ‐cresol‐imprinted silica nanoparticles was confirmed by UV‐Vis spectrophotometry, infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and transmission electron microscopy. Electron microscopic studies revealed the formation of monodispersed imprinted silica nanoparticles with spherical shape and an average size of 83 nm. The developed nanoparticles were filled in a syringe and used for the extraction of m ‐cresol from aqueous samples followed by quantification using high‐performance liquid chromatography with diode array detection. Various adsorption experiments showed that developed m ‐cresol‐imprinted silica nanoparticles exhibited a high adsorption capacity and selectivity and offered a fast kinetics for rebinding m ‐cresol. The chromatographic quantification was achieved using mobile phase consisting of acetonitrile/water (70:30 v/v) at an isocratic flow rate of 1.0 mL/min using a reversed‐phase C 18 column and detection at λ max = 275 nm. The limits of detection and quantification were 1.86 and 22.32 ng/mL, respectively, for the developed method. The percent recoveries ranged from 96.66–103.33% in the spiked samples. This combination of this nanotechnique with molecular imprinting was proved as a reliable, sensitive and selective method for determining the target from synthetic and real samples.