L-DOPA (3,4-dihydroxyphenyl-L-alanine) is a drug of choice in Parkinson's disease treatment. However the chemical method its synthesis has number drawbacks, so biotechnological approaches are being explored as an alternative. Aim. The goal to develop new affordable and effective biosynthesis using mushroom tyrosinase, immobilized economical carrier, which ensures stability enzyme multiple uses....

We report for the first time the synthesis of unimolecular polystyrene-based nanoparticles (PS-NPs) under normal air atmosphere by direct carbon-carbon “click” chemistry (i.e., “self-click” chemistry). First, statistical poly(styrene-co-4-vinylbenzyl chloride) copolymers synthesized by RAFT polymerization were decorated in a facile manner with alkyne groups by reaction with potassium propiolate...

Tuning the physical-chemical properties of Polypyrrole (PPy) opens up potentially exciting new applications, especially in the area of bacterial adhesion. Polypyrrole is electrochemically synthesised under various conditions and the physical properties of the films and their effects on bacterial adhesion characterised. Five types of dopants, chloride (Cl), Perchlorate (ClO4), pToluene-sulfonate...

Gamma radiation-induced graft copolymerization of styrene onto poly(ethylene terephthalate) (PET) films was studied using simultaneous irradiation technique. The effects of grafting conditions on the degree of grafting were investigated. The grafting conditions include monomer concentration, irradiation dose, dose rate, and the type of solvent. Moreover, the effect of the addition of crosslinki...

Ionically cross-linked polyelectrolyte complexes (PECs) of anionic poly(sodium 4-styrene sulfonate) (PSS) and cationic poly(diallyldimethylammonium chloride) (PDADMAC), xPSS.(1-x)PDADMAC, with molar fractions x ranging from 0.30 to 0.70, were prepared and subsequently dried. The PEC samples were analyzed by differential scanning calorimetry, and the ionic conductivity sigmadc of the samples was...

The title compound, C(12)H(12)N(2)O(2)S, was obtained by the reaction of 2-mercaptopyridine and benzyl-amine. The dihedral angle between the benzene and pyridine rings is 75.75 (9)°. In the crystal, mol-ecules are linked into chains along the c axis by N-H⋯O and N-H⋯N hydrogen bonds; the chains are cross-linked into a two-dimensional network parallel to the bc plane via C-H⋯O hydrogen bonds.

An intra-laboratory calibration to quantify microplastic in fine-grained marine sediments was performed with two objectives: (a) determine the recovery rate of self-produced microplastics characterized by a size ranging from 220 µm 5 mm and differing color (pink, orange, gray, yellow, silver), shape (fragments, filaments, spheres, films), chemical composition (polystyrene, polyethylene, polyvin...

introduction: the objective of this study was, wastewater quality investigation and removal efficiency of contaminants from the wastewater tile factory by using  coagulants includes ferric chloride, ferric sulfate and ferrous, aluminum sulfate and poly aluminum chloride in order to reuse it in the processing line. methods: this is an applied study. with regard to shiftwork schedules of the fact...

In this work, we present the first molecular dynamics simulation on the formation of a polyelectrolyte bilayer resolved in atomistic detail, extending a previous study of the adsorption of poly(styrene sulfonate) [B. Qiao, J. J. Cerdà and C. Holm, Macromolecules, 2011, 44, 1707-1718.] to the formation of a poly(styrene sulfonate)/poly(diallyldimethylammonium) bilayer. Extensive molecular dynami...