Mixed supramolecular hemimicelles aggregates and magnetic carrier technology for solid phase extraction of ibuprofen in environmental samples prior to its HPLC-UV determination

Surfactant-enhanced spectrofluorimetric determination of total aflatoxins from wheat samples after magnetic solid-phase extraction using modified Fe3O4 nanoparticles

“…One of the most popular strategies is focused on the use of magnetic nanoparticles (MNPs) taking into account many advantages arising from the inherent characteristics of these materials such as high surface area and superparamagnetism [21,22]. So, magnetic solid phase extraction (MSPE) methodology overcomes problems such as column packing and phase separation, which can be easily performed by applying an external magnetic field and suspended MNPs tagged with analytes can simply isolate from large volume samples using a strong magnet [23].…”

Humic substances stimulate maize nitrogen assimilation and amino acid metabolism at physiological and molecular level

“…The metastable conformations of humic associations can be reversibly disrupted by interactions with small amounts of organic acids [11,12], while the same amount of acids do not alter conformation of the true macropolymers stabilized by covalent bonds [13]. The supramolecular nature of humic matter and its response to organic acids have been advocated to explain the bioactivity of humus on plants [6], its molecular dynamics [14] and the slow release of sorbed contaminants [15]. Furthermore, the recognition that NOM is composed by supramolecular associations rather than macropolymers has allowed the development of a fractionation strategy, called humeomics, that enables the analytical detection of most of the single molecules which constitute the supramolecular assembly [16][17][18].…”

Determination of Estrogens in Milk Samples by Magnetic‐Solid‐Phase Extraction Technique Coupled With High‐Performance Liquid Chromatography

“…It is due to the fact that the aqueous solution viscosity would increase with the addition of salt, which results in difficult mass transfer and low extraction. In addition, competitions of Na + and CTAB cation surfactants for Fe 3 O 4 NPs substrate causes additional decrease (Beiraghi and others ). Moreover, it was believed that the addition of salt might change the physical properties of the Nernst diffusion film, reduce the diffusion rates of solutes from water to the sorbent surface, and ultimately affect the extraction efficiency (Tahmasebi and others ).…”

“…Magnetic carrier technology, first reported by Robinson in 1973 (Robinson and others ), has become an increasingly popular tool in environmental science, bio‐separation, and food analysis (Zhang and others ; Sun and others ; Bagheri and others ). It has been reported that large surface areas of naked Fe 3 O 4 NPs lead to particles agglomeration and formation of large cluster (Beiraghi and others ). Besides, naked Fe 3 O 4 NPs were lack of adsorption selectivity.…”