Selective aptamer conjugation to silver-coated magnetite nanoparticles for magnetic solid-phase extraction of trace amounts of Pb²⁺ ions

Abstract

Herein, a novel aptamer-functionalized magnetic adsorbent was developed and combined with magnetic solid-phase extraction (MSPE) for the specific enrichment of Pb2+ ions prior to flame atomic absorption spectrometric detection.

Magnetite azolla impedimetric nanobiosensor for phthalic acid esters quantification

“…The XRD pattern of the synthesized MAZ NCs matched with the XRD pattern of standard Fe 3 O 4 (JCPD-19-0629). 22,23 This conrmed the presence of a magnetite core with a cubic crystal structure in the structure of the synthesized MAZ NCs. 4.2.…”

Recent applications of atomic spectroscopy coupled with magnetic solid‐phase extraction techniques for heavy metal determination in environmental samples: A review

“…The RSDs varied from 4.6–7.9%, with a detection limit of 1.0 ng L −1 . Sara Rahnama et al [ 112 ] proposed silver‐coated MNPs (Fe 3 O 4 @Ag MNPs) as a sorbent for the selective extraction of Pb(II) in water by FAAS. At pH 7.0, the adsorbent exhibited good recoveries of Pb(II), 3 ml of 0.25 mol L −1 of HCl used for elution.…”

Applications of Smartphone-Based Aptasensor for Diverse Targets Detection

“…Aptamers are short oligonucleotide sequences obtained by in vitro screening, which can bind to multiple targets with high affinity and specificity, and have unique physical and chemical characteristics [ 23 ]. Aptamers with stable performance can specifically bind small substances such as ions [ 24 , 25 ], molecules [ 26 ], proteins [ 27 , 28 ], and cells [ 29 ]. Aptamers can be selected by the systematic evolution of ligands by exponential enrichment (SELEX), which is an iterative process that involves repetitive cycles of binding, partitioning, and amplification steps.…”