Search results for "Glutaral"
showing 10 items of 33 documents
Resistance to disinfection of a polymicrobial association contaminating the surface of elastomeric dental impressions.
2009
The aim of this study was to evaluate the ability to resist disinfection of a polymicrobial association contaminating the surface of dental impressions obtained with two different elastomers: a polyether (Impregum) and an addition-polymerized silicone (Elite). Impressions were contaminated with a mixture of three biofilm-forming microorganisms (Staphylococcus aureus, Pseudomonas aeruginosa and Candida albicans) and disinfected immediately after contamination, or after microbial layers were allowed to develop during a six-hour storage. Two commercial disinfectants were tested: MD 520 containing 0.5% glutaraldehyde and Sterigum Powder without glutaraldehyde. Residual contamination was recover…
Synthesis and characterization of modified sulfonated chitosan for beryllium recovery
2019
Abstract A new adsorbent, sulfated crosslinked chitosan (SGCH), has been synthesized for the effective extraction of beryllium ions from their aqueous solutions. In recent times, beryllium extraction has been of great importance because beryllium can be used in many applications such as in nuclear reactor, heat shields, high-technology ceramics, alloys and electronic heat sinks. SGCH has been synthesized by two successive phases. The first is the conversion of chitosan (CH) into non-soluble cross-linked chitosan (GCH) through the interaction between chitosan and glutaraldehyde. The second step is the formation of functional sulfonate groups onto the adsorbent material through the interactio…
Biodegradation of differently cross-linked collagen membranes: an experimental study in the rat.
2005
Contains fulltext : 47774.pdf (Publisher’s version ) (Closed access) The aim of the present study was to compare the biodegradation of differently cross-linked collagen membranes in rats. Five commercially available and three experimental membranes (VN) were included: (1) BioGide (BG) (non-cross-linked porcine type I and III collagens), (2) BioMend (BM), (3) BioMendExtend (BME) (glutaraldehyde cross-linked bovine type I collagen), (4) Ossix (OS) (enzymatic-cross-linked bovine type I collagen), (5) TutoDent (TD) (non-cross-linked bovine type I collagen, and (6-8) VN(1-3) (chemical cross-linked porcine type I and III collagens). Specimens were randomly allocated in unconnected subcutaneous po…
Reduced in vitro T-cell responses induced by glutaraldehyde-modified allergen extracts are caused mainly by retarded internalization of dendritic cel…
2012
Summary Although allergen-specific immunotherapy is a clinically effective therapy for IgE-mediated allergic diseases, the risk of IgE-mediated adverse effects still exists. For this reason, chemically modified allergoids have been introduced, which may destroy IgE-binding sites while T-cell activation should be retained. The aim of the study was to analyse the differences between intact allergens and differently modified/aggregated allergoids concerning their internalization as well as T-cell and basophil activation. For this purpose human monocyte-derived immature dendritic cells (DC) were incubated with Phleum pratense or Betula verrucosa pollen extract or with the corresponding allergoi…
Comparison of an indirect format ELISA on modified graphite and polystyrene surfaces against triazines.
2006
An indirect format enzyme-linked immuno-sorbent assay (ELISA) on graphite rods (Ø 0.8 mm x 20 mm) and, for comparison, on microtiter plates has been developed against terbuthylazine. For this purpose, a series of 2-aminoalkyl-4-chloro-6-terbuthyl-s-triazine-2,6- diamine ELISA haptens with alkyl spacer lengths of 2, 4, 6, and 8 CH2 groups has been synthesized. The graphite rods or the microtiter plates were covered by a polymerized glutaraldehyde network, and the ELISA haptens have been coupled by imino coupling to the free aldehyde groups of that network. ε-Aminocaproic acid has been used as an agent to block unspecific binding sites. The ELISA was run in a competitive mode, where the immob…
Synthesis and characterization of water-swellable?,?-polyasparthydrazide derivatives
1995
α, β-polyasparthydrazide (PAHy) was crosslinked by glutaraldehyde to form water-swellable materials possessing a three-dimensional molecular network. Different crosslinking degrees were prepared varying glutaraldehyde/PAHy ratio and samples containing 5-fluorouracil were obtained by incorporating the drug into the polymer networks during the crosslinking reaction. All samples were characterized by swelling tests, thermal, x-ray and SEM analysis. Their microstructure was observed through scanning electron microscopy. Furthermore, for samples containing the anticancer drug,in vitro release studies were performed in pH 7.4 buffer solution.
Kultivierung humaner Zellen auf polymerbeschichteten Bioimplantaten?ein neues Konzept zur Verbesserung der Implantateigenschaften
2004
BACKGROUND AND PURPOSE Calcific degeneration with the resulting need for operative replacement remains the major drawback of bioprostheses. Previous studies have shown that cellular surface seeding decreases calcium uptake in vitro and in vivo, but complete coverage remains difficult to achieve. A new approach is presented, masking glutaraldehyde residues with a covalently bound polymer layer thus facilitating cell seeding. The aim of this study was to evaluate different polymers for their ability to promote surface cell adhesion and formation of complete monolayers. MATERIAL AND METHODS Ten ultrathin polymers, covalently bound to glass and exhibiting different physicochemical characteristi…
Cyclopolymerisation einiger glutardialdehyde. Struktur der polymeren
1962
Die loslichen Spontanpolymerisate des Glutardialdehyds, β-Methyl- und β-Phenylglutardialdehyds bestehen auf Grund ihrer Eigenschaften und IR-Spektren vornehmlich aus Tetrahydropyranstruktureinheiten, die durch eine Cyclopolymerisation gebildet werden. Es wird ein infrarotspektroskopischer Vergleich mit verschiedenen niedermolekularen Tetrahydropyran-Modellsubstanzen durchgefuhrt. Die unkatalysierte Polymerisation last sich infrarotspektroskopisch verfolgen. Die Poly-glutardialdehyde konnen acetyliert werden. Die Polymeren erfahren durch die Acetylierung eine wesentliche thermische Stabilisierung. Die Eigenschaften und IR-Spektren der Spontanpolymerisate werden mit denen des vernetzten Poly-…
Umsetzungen von Modellverbindungen des Polyacroleins mit Cyanessigsäureäthylester. Polymere acroleine. 26. Mitt.1
1963
An Isobutyraldehyd, Glutardialdehyd und verschiedenen Tetrahydropyranverbindungen werden mit Cyanessigsaureathylester Umsetzungen ausgefuhrt. Art und Menge der erhaltenen Reaktionsprodukte gestatten Ruckschlusse auf die Reaktionen zwischen Polyacroleinen und methylenaktiven Verbindungen. Die moglichen Strukturen der Polyacrolein-Derivate werden diskutiert. The reaction of isobutyraldehyde, glutaraldehyde and various tetrahydropyranderivatives with cyanoacetate ethyl was studied. Structure and yield of the reaction products determines the course of the reaction of polymers of acrolein with methylene-active compounds. The possible structures of the polyacrolein derivatives are discussed.
Preliminary magnetic resonance relaxometric analysis of Fricke gel dosimeters produced with polyvinyl alcohol and glutaraldehyde
2017
This work describes the preliminary analysis of Fricke gels dosimeters characterized by a new formulation making use of a matrix of polyvinyl alcohol cross-linked by adding glutaraldehyde and analyzed by means of nuclear magnetic resonance relaxometry. In previous optical studies, these gels have shown promising dosimetric features in terms of photon sensitivity and low diffusion of ferric ions produced after irradiation. In this work, we used a portable nuclear magnetic resonance relaxometer to measure the relaxation times (which are important for dosimetric applications) of these gel materials. For this purpose, we performed a study for optimizing the acquisition parameters with a nuclear…