Abstract Alginates are natural polysaccharides that extracted from brown seaweed varieties and it is widely used for their rheological properties. The main step in the extraction protocol of sodium alginate alkaline extraction. Sodium was produced by dipping 1% formaldehyde 2.5% carbonate solution properties were studied following standard methods. amount yield 31.7% Sargassum wightii . moistur...

Each of the constituent enzymes of the pathway was present with sufficient activity to account for the observed rate of alginate biosynthesis. The information obtained from this work, together with other biochemical information, e.g. knowledge of the mechanisms of nitrogen fixation and respiration (Yates & Jones, 1974) and of the deposition of poly-8-hydroxybutyrate in A . vinelundii (Dawes & S...

In this paper the manipulation of Ca-alginate microspheres, using a microfluidic chip, for the encapsulation of gold nanoparticles is presented. Our strategy is based on hydrodynamic-focusing on the forming of a series of self-assembling sphere structures, the so-called water-in-oil (w/o) emulsions, in the cross-junction microchannel. These fine emulsions, consisting of aqueous Na-alginates, ar...

AIM Several new irreversible hydrocolloid formulations have recently become available with claims of an improved dimensional stability by the manufacturers. The aim of this study was to evaluate the accuracy of casts made from alginate impression materials poured immediately and after specific storage periods. METHODS AND MATERIALS Five alginates were tested: CA 37 (Cavex); Jeltrate (Dentsply...

An absorbable haemostatic is a material which acts as a haemostat but is subsequently itself absorbed in the tissues, leaving no trace. Such a material is of use in certain cases of haemorrhage which it is impossible or impractical to control by more direct methods. Since haemostasis was at all times one of the primary aims of surgery, it is obvious that the search for such materials is of long...

Alginate epimerases are large multidomain proteins capable of epimerising C5 on beta-D-mannuronic acid (M) turning it into alpha-L-guluronic acid (G) in a polymeric alginate. Azotobacter vinelandii secretes a family of seven epimerases, each of which is capable of producing alginates with characteristic G distribution patterns. All seven epimerases consist of two types of modules, denoted A and...