A new microemulsion approach for producing molecularly imprinted polymers with selective recognition cavities for gallic acid

Abstract

Bulk and microemulsion systems were studied in order to obtain molecularly imprinted copolymers selective for gallic acid. Both systems contained acrylic acid as the functional monomer and ethylene glycol dimethacrylate as crosslinker. Microemulsion formation was confirmed by refractive index measurements and by conductivity analyses. Simple uptake tests revealed higher affinities for the microemulsion polymers; a 3.55 imprinting factor and a 0.275 g gallic acid (g polymer) -1 adsorption capacity were recorded. Competitive uptake tests, from an oak bark extract, were in agreement with the simple uptake results and BET analyses. Microemulsion polymer particles selectively bind 4.58 times more gallic acid molecules relative to other competitor species.

Selective decontamination of aflatoxin M1 in milk by molecularly imprinted polymer coated on the surface of stainless steel plate

“…The adsorption capacity ( Q ) (μg/cm 2 ) was calculated by the following equation (Nicolescu et al . ):where, C i and C f represent the initial and final concentrations of DMC in the solution (μg/mL), respectively. A is the surface area of the polymer (cm 2 ), and V is the volume of the solution (mL).…”

“…The distribution coefficient ( K D ), representing mass transfer and separation capacity of the solute in two phases, was calculated by the following equation (Nicolescu et al . ):where, Q a is the concentration of adsorbed compound in the MIP (μg/cm 2 ) and C f is the concentration of the compound in the solution (μg/mL). In order to compare the selectivity of the MIPs between DMC and its analogues, the selectivity coefficient ( K ), reflecting the difference between two compounds adsorbed by the MIP, was determined by the following equation (Nicolescu et al .…”

“…In order to compare the selectivity of the MIPs between DMC and its analogues, the selectivity coefficient ( K ), reflecting the difference between two compounds adsorbed by the MIP, was determined by the following equation (Nicolescu et al . ):where, K D1 and K D2 represent the distribution coefficients for DMC and the analogues, respectively. In addition, the imprinting factor (IF) was used to evaluate the selectivity properties of MIPs and NIPs toward the tested compounds.…”

Thermal analyses as tools for proving the molecular imprinting with diosgenin and sclareol in acrylic copolymer matrices

“…Among these types of analyses, an important role is represented by thermal analysis. The thermal methods most often used for MIP characterization are the thermogravimetric analysis (TG), sometimes coupled with mass spectrometry (MS) or Fourier transform infrared spectroscopy (FT-IR), the differential scanning calorimetry (DSC), pyrolysis, and dynamic mechanical thermal analysis (DMTA) [7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Water‐compatible imprinted polymers based on CS@SiO2 particles for selective recognition of naringin

“…Molecularly imprinted polymers (MIPs) with affinity and specificity, compared with other recognition systems, possess many promising characteristics, such as low cost and easy synthesis, high stability to harsh chemical and physical conditions, and excellent reusability. Thus, MIPs have received increasingly attentions in many fields, particularly as selective adsorbents for solid‐phase extraction, chromatographic separation, ligand binding assays, chemical sensors . And they are being proposed for the development of novel biorecognition elements for active components in aqueous media.…”