Algins preparation

A review is presented on the controlled delivery of drugs from alginate matrices over the period 1948 to 2002. It deals with the sources, extraction, structure and properties of alginate, preparation of alginate particulates and controlled drug delivery from alginate matrices. 166 refs. INDIA... 

Beat-Cured Restm. For optimum comfort and to impede further loss of chewing efficiency, close adaptation of the denture base to contiguous oral tissues is required, which necessitates custom-made appHances. Nearly all dentures are made of acryHc resins. A wax pattern is used to form a custom denture base in which the denture teeth are embedded. A plaster or dental-stone investment spHt mold of this wax denture base and teeth is prepared. The wax portion is removed and the surface of the resulting mold cavity is painted with a separating medium, usually an aqueous solution of alginate, to aid in the removal of the cured acryHc from the plaster mold. 

Sodium alginate (Fisher Scientific, Manchester, UK) was prepared by dissolving 10 g of powder form in 500 ml of distilled water. A separate solution of 120 g of calcium chloride was dissolved in 21 of distilled water. Sodium alginate and calcium chloride solution were... 

In preparing immobilised cells, 1.5, 2, 3 and 6% alginate was used. By pressing them manually, the hardness and rigidity of the beads were tested. The physical criteria of the... 

Microspheres were prepared from carboxymethyl chitosan and alginate by emulsion phase separation. The encapsulated bovine serum albumin was... 

Lactic acid bacteria were immobilized in Ca-alginate beads prepared from different concentration of Na-alginate (1.0%, 2.0%, 4.0%, 6.0% and 8.0% w/v) and their fermentation efficiencies were investigated in liquid pineapple waste containing 31.3 gL of glucose... 

Buthe, A., Hartmeier, W., and Ansorge-Schnmacher, M.B., Novel solvent-based method for preparation of alginate beads with improved roundness and predictable size, J. Microencapsulation, 21, 865, 2004. 

Rapidase C-80 (Gist -brocades) was used as enzyme source. The fractionation procedure of the crude preparation included chromatography on Bio-Gel PIO (100-200 mesh), DEAE-Bio-Gel A, and Bio-Gel HTP (Bio-Rad, Richmond, CA, USA). Other column materials used were cross-linked alginate (degree of cross-linking 2.34, prepared in our laboratory). Phenyl Superose HR 5/5 and Mono Q HR 5/5 (Pharmacia Biotech, Uppsala, Sweden). 

On the other hand, in preparing whipped products which are to stand for a long period of time, it is often necessary to add various gums, such as Irish moss, algin, and locust bean gum, to have a product that will react in some way with the protein being whipped, to make a firm film and stable foam. 

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