Search results for "Molecular size"
showing 5 items of 5 documents
SP0027 Biosimilars: Potential Clinical Differences and European Regulatory Aspects
2014
Although successful drugs, the use of anti-TNFs is limited by their high cost, and in the present climate of economic difficulty, there is pressure to find alternatives that reproduce their effects at a lower price. Due to their large molecular size and structural complexity, anti-TNFs are impossible to duplicate, unlike smaller, chemically-generated compounds, which can be copied. However, unlike generics, biosimilars are similar rather than identical to the original drugs. Determining the level of similarity that guarantees a comparable efficacy and safety represents a new test for the pharmacological market. Biosimilars of smaller biological molecules, such as somatotropin, EPO and GCSF …
A screening study on the fate of fullerenes (nC60) and their toxic implications in natural freshwaters
2013
Increasing usage of fullerenes (C60) increases their opportunities to be released into the environment. For risk assessment, it is important to understand the environmental fate and ecotoxicological effects of C60. In the present study, fullerene settling was measured during a 1-yr period with 4 different lake waters and an artificial freshwater, and Daphnia magna immobilization and fullerene accumulation was also measured in each of the lake waters. Depending on the characteristics of the lake waters, fullerenes either exhibited extended water stability or settled rapidly; in all waters, there was a fraction that remained stable after 1 yr. Water stability was affected by the quality and m…
Synthese von makromolekeln einheitlicher größe.
1953
Es werden die Wege zur Herstellung von Makromolekeln einheitlicher Grose diskutiert, namlich die schrittweise Synthese, die Trennung polymerhomologer Gemische und das Duplikationsverfahren. Nach dem zuletzt genannten Verfahren werden mit Hilfe von Diisocyanaten und Diolen in 3 Stufen Oligo-urethane einheitlicher Molekelgrose bis zum Molgewicht ca. 2000 hergestellt und durch Derivate charakterisiert. The methods by which macromolecules of uniform molecular size can be prepared are discussed. These are the synthesis step by step, the separation of polymerhomologue mixtures and the method of duplication. According to the last-named method Oligourethanes of a uniform molecular weight of about 2…
Quantitative structure-retention relationships for ionic and non-ionic compounds in biopartitioning micellar chromatography
2004
Quantitative structure–retention relationships, QSRRs, represent a powerful tool in chromatography. The objectives of QSRR studies are to predict the chromatographic retention behaviour of solutes based on their structural properties, to elucidate retention mechanisms, to optimize the separation of complex mixtures or to prepare experimental designs. In this paper, using the retention factors of 151 structurally unrelated solutes that cover a wide range of hydrophobicity, molecular size, hydrogen bonding properties and ionization degrees obtained in biopartitioning micellar chromatography (BMC) at different Brij35 micellar concentrations, several multivariate QSRR models are tested. It is d…
Exopolysaccharide produced by Weissella confusa: Chemical characterisation, rheology and bioactivity
2019
Abstract The purpose of this study was to characterise the production of exopolysaccharide (EPS) by indigenous lactic acid bacteria (LAB) isolated from traditional Algerian dairy products and to evaluate their possible use in agri-foods. Among the collection of isolated strains, the strain Weissella confusa (W4) was selected for its ability to produce EPS once exposed to a sucrose culture medium. EPS produced were first isolated with a standardised method and further characterised in terms of molecular size, antioxidant activity, and rheological properties. Its direct implication in the texture and syneresis of acid milk gel was evaluated offering interesting industrial applications for its…