In the present study, chitosan was included in pectin ionotropic gel to improve its mechanical and bioadhesive properties. Pectin–chitosan gels P–Ch0, P–Ch1, P–Ch2, P–Ch3 of weight fractions 0.00, 0.25, 0.50, 0.75 were prepared characterized by dynamic rheological tests, penetration serosal adhesion ex vivo assays. The storage modulus (G′) loss (G″) values, hardness, elasticity P–Ch1 significan...

The sieving characteristics of the normal and inflamed rectal mucosa are studied in three healthy volunteers and five patients with ulcerative colitis. Following rectal instillation of (125)I-polyvinylpyrrolidone (PVP), the molecular size distribution of labelled PVP in urine samples was determined by Sephadex gel filtration. The results of the study suggest that the increased permeability of t...

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...

An adhesive and conductive glue was created by synergistic assembly of graphene oxide (GO), single walled carbon nanotubes (SWCNTs) and conjugate polymer PEDOT:PSS in aqueous solution. The GO–SWCNTs–PEDOT:PSS glue can be used as a binder to fabricate metal oxide nanoparticle based ultracapacitors. Since the functional nanoparticles are immersed in this conductive gel, uniform electrical and mec...

BACKGROUND The European Resuscitation Council (ERC) Guidelines recommend providing chest compressions during defibrillator charging and using adhesive pads for defibrillation to increase the effectiveness of resuscitation. However, the most common defibrillation technique in each European country is unknown, as are the potential barriers in implementation of the guidelines. The aim of this stud...

Objective. This study evaluated the effect of ethylenediaminetetraacetic acid (EDTA) conditioning and carbodiimide (EDC) pretreatment on the shear bond strength of two all-in-one self-etch adhesives to dentin. Methods. Flat coronal dentin surfaces were prepared on one hundred and sixty extracted human molars. Teeth were randomly divided into eight groups according to two different self-etch adh...

A novel medical adhesive was prepared by blending poly(lactic acid) (PLA) with poly(trimethylene carbonate) (PTMC) in ethyl acetate, and the two materials were proven to be biodegradable and biocompatible. The medical adhesive was characterized by ¹H nuclear magnetic resonance (¹HNMR), gel permeation chromatography (GPC), scanning electron microscopy (SEM) and differential scanning calorimetry ...

Several molluscs have been shown to alternate between a non-adhesive trail mucus and a similar gel that forms a strong glue. The major structural difference between the two secretions is the presence of specific proteins in the adhesive mucus. The present study identifies similar proteins from the glue of the slug Arion subfuscus and the land snail Helix aspersa. To investigate the role played ...

Multiple particle-tracking techniques were used to quantify the thermally driven motion of ensembles of naked polystyrene (0.5 µm diameter) microbeads in order to determine the microrheological characteristics around the gut mucosa. The microbeads were introduced into living ex vivo preparations of the wall of the terminal ileum and proximal colon of the brushtail possum (Trichosurus vulpecula)...

The presence of catechol groups in hydrogels, either grafted to the constituting polymers or added gel formulation allow increase adhesion strength such hydrogels. In this investigation, we add pyrocatechol (1,2-benzenediol) and pyrogallol (1,2,3-benzenetriol) gelatin solution form hydrogels using sodium periodate as an oxidant with aim induce interactions between pyrocatechol/pyrogallol chains...