These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Chemical nanosensors based on molecularly-imprinted polymers doped with silver nanoparticles for the rapid detection of caffeine in wastewater.
    Author: Hu R, Tang R, Xu J, Lu F.
    Journal: Anal Chim Acta; 2018 Nov 30; 1034():176-183. PubMed ID: 30193632.
    Abstract:
    Caffeine is a common pharmaceutical and personal care product pollutant in wastewater. This work offers rapid and single-step detection of caffeine in an aquatic matrix based on high performance surface-enhanced Raman scattering (SERS). Novel chemical SERS nanosensors were developed employing molecularly-imprinted polymer (MIP) particles loaded with Ag nanoparticles (AgNPs) using precipitation polymerization to form AgNPs@MIP nanocomposites. Theophylline was applied as a dummy template molecule in the synthesis process due to its high structural similarity with caffeine and greater availability. The nanocomposite was characterized by Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), and ultraviolet-visible (UV-vis) spectroscopy. Static and kinetic adsorption testing demonstrated the specific affinity of AgNPs@MIP nanocomposites for caffeine and a rapid adsorption equilibration rate. Moreover, a simple solid phase extraction cartridge comprising AgNPs@MIP nanocomposites as adsorbents (AgNPs@MISPE), a syringe, and a removable microporous membrane were employed to detect the SERS signal of caffeine. The AgNPs@MISPE was used to detect caffeine with excellent uniformity (relative standard deviation, RSD = 4.8%) and good repeatability (RSD = 8.7%). The separation and detection processes were integrated into a single step, and the overall analysis time was 23 min. The detection limit was 100 ng L-1, which is less than the caffeine content reported in many rivers. The experimental results demonstrate that the proposed chemical nanosensors are a low-cost and reliable tool for the rapid screening of caffeine in wastewater or other aquatic matrices.
    [Abstract] [Full Text] [Related] [New Search]