title: A Simple and Rapid Method Based on Anti-aggregation of Silver Nanoparticles for Detection of Poly(diallyldimethylammonium chloride) in Tap Water.
abstract: A simple and rapid method was developed for the detection of poly(diallyldimethylammonium chloride) (PDADMAC) using citrate-capped silver nanoparticles (AgNPs). Detection was based on anti-aggregation of AgNPs in phosphate buffer caused by PDADMAC. Due to its positive charges, PDADMAC was adsorbed onto AgNPs via electrostatic interaction with citrate, which resulted in the charges at the particle surfaces to become positive and caused repulsion among particles. Furthermore, long-chain PDADMAC provided steric hindrance. These two effects promoted the dispersion of AgNPs in the phosphate buffer. A change in the state of dispersion influenced the surface plasmon resonance (SPR) of AgNPs. Therefore, in this work, the concentration of PDADMAC was determined by monitoring changes in absorbance (at 396 nm) caused by SPR of AgNPs. Under optimal conditions, the calibration was linear over the range of 1 to 100 mg L(-1) with a detection limit of 0.7 mg L(-1). Satisfactory precision was obtained (RSD = 2.8%). This method was successfully applied to the determination of PDADMAC in tap water samples. The recoveries ranged from 86.0 - 107.5%.
authors.affiliation: Department of Chemistry and Applied Analytical Chemistry Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang.
authors.forename: Wichaya
authors.initials: W
authors.lastname: Trisaranakul
authors.forename: Apiwat
authors.initials: A
authors.lastname: Chompoosor
authors.forename: Weerakanya
authors.initials: W
authors.lastname: Maneeprakorn
authors.forename: Duangjai
authors.initials: D
authors.lastname: Nacapricha
authors.forename: Nathawut
authors.initials: N
authors.lastname: Choengchan
authors.forename: Saowapak
authors.initials: S
authors.lastname: Teerasong
mesh_terms: D000327:Adsorption; D002138:Calibration; D002951:Citrates / Q000737:chemistry; D060766:Drinking Water / Q000737:chemistry*; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011095:Polyethylenes / Q000032:analysis*; D000644:Quaternary Ammonium Compounds / Q000032:analysis*; D015203:Reproducibility of Results; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002951:Citrates; D060766:Drinking Water; D011095:Polyethylenes; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; C041004:poly-N,N-dimethyl-N,N-diallylammonium chloride; D012834:Silver