A gold nanoparticle (AuNP)-based colorimetric method was developed for the molecular weight (MW) determination of polyethylene glycol (PEG), a commonly used hydrophilic polymer. Addition of a salt solution to PEG-coated AuNP solutions helps in screening the electrostatic repulsion between nanoparticles and generating a color change of the solutions from wine red to blue in 10 min in accordance ...

In this work, a series of advanced phase change materials (PCMs) were fabricated by using polyrotaxane (PLR) as supports for encapsulating poly (ethylene glycol) (PEG). Phase-change enthalpy is mainly regulated the PEG contents, whereas temperature controlled molecular weight. All PCMs have good form stabilities due to compatibility between PLR and PEG, supporting ability PLR. Given that suppor...

Biodegradable oligolysine and oligoarginine-type homopeptides functionalized with PEG of two different molecular weights interact with insulin, at physiological pH, affording complexes studied by dynamic light scattering, ζ-potential, circular dichroism, FTIR spectroscopy, and isothermal titration calorimetry (ITC). High levels of insulin complexation efficiencies (>99.5%) were determined for a...

Introduction Marine mussels are known to secrete unique adhesive proteins that form strong bonds with various substrates in the presence of water.1 These mussel adhesive proteins (MAPs) are secreted as fluids and can undergo rapid curing to form adhesive plaques in a wet environment. The presence of the unusual amino acid 3,4-dihydroxyphenylalanine (DOPA) in MAPs is believed to impart strong ad...

The effect of PEGylation on the thermal response and protein adsorption resistance of crosslinked PNIPAm microgels was investigated. It was found that the presence of PEG, its molecular weight (M(n) 300 and 1100 g/mol) and its concentration (10, 20, and 30 wt.%) each significantly influenced both the value and breadth of the volume phase transition temperature (VPTT) and the adsorption of bovin...

Nonviral gene delivery suffers from a number of limitations including short transgene expression times and low transfection efficiency. In this study, we examined whether polypseudorotaxanes (PPRXs) of polyethylene glycol (PEG, molecular weight: 2,000)-grafted α-cyclodextrin (α-CyD)/polyamidoamine dendrimer conjugate (PEG-α-CDE) with CyDs have the potential for the novel sustained release syste...

Polyethylene glycol (PEG) is often used in protein crystallography as a low-ionic-strength precipitant for crystallization and as a cryoprotectant for low-temperature data collection. Prompted by the discovery of an apparent L-lactate molecule bound in the active site of the Escherichia coli PutA proline dehydrogenase domain crystal structure, the L-lactate concentration of several PEG solution...

Extraction of laccase produced by L. polychrous in an aqueous two-phase system, composed of polyethylene glycol and phosphate salt at pH 7.0 and 25C was investigated. The effect of PEG molecular weight, PEG concentration and phosphate concentration was determined. Laccase preferentially partitioned to the top phase. Good extraction of laccase to the top phase was observed with PEG 4000. The opt...

alpha-Amino-omega-hydroxyl-poly(ethylene glycol) (PEG) with different molecular weight (M(r)=2100, 4400, 7200) were synthesized and used as carrier for the combination of sulfadiazine and chlorambucil. In vivo, all these polymer drugs with sulfadiazine and chlorambucil at each end are water soluble and showed the higher antitumor activity against Lewis lung cancer than the same polymers but wit...

This study first reports the pharmacokinetic disposition of polyethylene glycol (PEG)-modified salmon calcitonin (sCT) based on the number of attached PEG molecules. PEG-modified sCT was prepared by covalent linkage with succinimidyl carbonate monomethoxy polyethylene glycol. Mono- and di-PEG-sCTs were separated by size exclusion and reverse phase HPLC, and radioiodinated by the chloramine-T me...