Water pollution from industrial or household waste, containing dyes the textile industry, poses a significant environmental challenge requiring immediate attention. In this study, we have developed crosslinked-smart-polymer film based on 2-(dimethylamino)ethyl methacrylate copolymerized with other hydrophilic and hydrophobic commercial monomers, its efficacy in removing 21 different was assessed. The smart polymer effectively interacts adsorbs dyes, inducing noticeable colour change. UV-Vis...

We have developed an in situ methodology for determining nitrite concentration processed meats that can also be used by unskilled personnel. It is based on a colorimetric film-shaped sensory polymer changes its color upon contacting the meat and mobile app automatically calculates manufacturing residual only taking digital photographs of films analyzing parameters. The sensor detects anions azo-coupling reaction, since they activate this reaction between two four monomers copolymer on....

This work presents a theoretical study of acetohydroxamic acid and its protonation processes using ab initio methodology at the MP2(FC)/cc-pdVZ level. We find amide form more stable than imidic tautomer by less 1.0 kcal mol(-)(1). For comparison with experimental data, three-dimensional conformational is performed on most (amide). From this study, different barriers to rotation inversion are determined intramolecular hydrogen bond between OH group carbonyl oxygen characterized. The...

Iron in blood serum, wine and water has been visually detected quantified quickly by processing photographs of an iron colorimetric sensory polymer substrate. The may be taken with a conventional digital camera or Smartphone. materials were designed following straightforward strategy. A proven organic chelator was easily transformed into acrylic monomer further copolymerized hydrophilic co-monomers to render membrane comprised hydrophilic, gel-like, network. film-like generated cut...

Selective and sensitive solid sensory substrates for detecting Al(III) in pure water are reported. The material is a flexible polymer film that can be handled exhibits gel behavior membrane performance. features chemically anchored salicylaldehyde benzoylhydrazone derivative as an aluminum ion fluorescence sensor. A novel procedure measuring at the ppb level using single solution drop 20 min was developed. In this procedure, allowed to enter hydrophilic 15 before 5 drying period. process...

Speciation of Hg²⁺ and MeHg⁺ has been achieved by <italic>in vitro</italic> approaches with fluorogenic probes supported in cultured cells.

Quality control in the food industry is of upmost importance from safety, organoleptic and commercial viewpoints. Accordingly, development situ, rapid, costless analytical tools a valuable task which we are working. Regarding this point, copper content grape must has to be determined by wineries along wine production process. For purpose, samples sent laboratories where measured usually flame atomic absorption spectrometry or inductively coupled plasma mass spectrometry. We herein propose...

The healing processes in cutaneous wounds, i.e., chronic represent a health problem affecting 1–2 % of the population. evaluation these wounds is mainly based on subjective parameters, although there medical consensus protease activity as best marker for disorders. Here we show correlation amino acid concentration and with their evolution, development test kit to straightforward determining this evolution. Our colorimetric sensory polymer film that change its colour upon contacting acids....

The kinetics and equilibria of the interaction ethidium bromide (EB) with triple-stranded RNA, poly(rA)·2poly(rU), have been investigated by stopped-flow, absorption, fluorescence, circular dichroism methods; to properly assess effect third strand on polymer molar properties, volumes, adiabatic compressibilities, heats melting also measured for both poly(rA)·2poly(rU) poly(rA)·poly(rU). experiments reveal that tends destabilize triplex, whereas it stabilizes duplex; however, triplex/ethidium...

The structure and dynamics of alkan-1-ol/alkylbenzoate binary mixtures have been studied by microwave dielectric relaxation spectroscopy in the 200 MHz to 20 GHz frequency range. methanol, ethanol, propan-1-ol, butan-1-ol, pentan-1-ol with methyl, ethyl, propyl, butyl benzoates were at 298.15 K. relaxational response pure alcohols, esters, their over full composition range is properly described Havriliak-Negami model. alcohol content, length, alkyl side-chain effects on properties for these...

Theoretical (ab initio calculations) and experimental (NMR, spectrophotometric, potentiometric measurements) investigations of the isomers acetohydroxamic acid (AHA) their deprotonation processes have been performed. Calculations with Gaussian 98 package, refined at MP2(FC)/AUG-cc-pVDZ level considering molecule isolated, indicate that Z(cis) amide is most stable form neutral molecule. This species less (Z)-imide undergo deprotonation, giving rise to two anions. Upon E(trans) forms give...

The kinetics of the oxidation L-ascorbic acid by hexacyanoferrate(III) ions have been investigated in strongly acidic media over a wide range acidity. Two different mechanisms involving monoascorbate anion, AH–, neutral molecule ascorbic AH2, and protonated species AH+3, as well ion Fe(CN)3–6, monoprotonated form HFe(CN)2–6 are suggested. Kinetic evidence for specific catalytic effct binding alkali-metal to oxidant is reported. derived rate equations good agreement with experimental observations.

Excess viscosities and excess Gibbs energies of activation for viscous flow at five temperatures have been calculated binary liquid mixtures pyrrolidin-2-one with (C6–C10) alkan-1-ols from the experimental densities mixed fluids. The were negative, increased increasing temperature. fitting to one-parameter (d) Nissan–Grunberg equation, two-parameter (ν12 ν21) McAllister equation was extended C1–C5 alkanols using earlier results, examined in terms interactions between unlike molecules. ν12...

The role of solvent effects on the thermodynamics and kinetics coralyne self-aggregation process has been investigated in ethanol−water mixtures different compositions. changes UV/visible spectra FAB/LSIMS mass spectrometry agreed well with formation a dimer species. 1D 2D 1H experiments have allowed one to look into features determine equilibrium constant ΔH0 ΔS0 values for aggregate 0−50% mixtures. by T-jump chemical relaxation method, results interpreted terms formation. dependence...

We report herein a fluorescence polymer membrane as film-shaped solid sensory kit for the detection and quantification in water of saccharides, namely, fructose glucose, dopamine. The motifs are phenylboronic acids, which chemically incorporated network radically initiated bulk polymerization process. is fluorescent. interaction with dopamine "turn-off" due to dynamic quenching, while stable complexes formed saccharides giving rise "turn-on". variation intensity wavelength maxima permitted...

A theoretical and experimental study on the structure deprotonation of benzohydroxamic acid (BHA) has been performed. Calculations at RHF/cc-pVDZ level, refined by B3LYP/AUG-cc-pVDZ method, indicate that, in gas phase, Z amide is most stable both neutral deprotonated BHA. (1)H-(1)H nuclear Overhauser enhancement spectroscopy correlation spectra acetone, interpreted with ab initio interatomic distances, reveal that BHA split into E forms, [E]/[Z] ratio being 75:25 -80 degrees C. The formation...

We report a fluorogenic probe that is able to discriminate range of primary or secondary biogenic amines and their natural synthetic mimics, in water buffer, by means the turn-on transient generation green fluorescence, with high quantum yields low detection limits, thus making system suitable for abuse drugs, such as MDMA, from ecstasy tablets.