Alginic acids preparation

Mizuno, H., Saito, T., Iso, N., Onda, N., Noda, K., andTakada, K. (1983) Mannuronic to guluronic acid ratios of alginic acids prepared from various brown seaweeds. Butt. Jap. Soc. Sci. Fish., 49, 1591-1593. 

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... 

An alternative method for their preparation is by oxidation of uronic acids (XV) which are available from alginic acids (from kelp). 

When treated with 5% sulfuric acid for 1.5 hours at 150°, pectin and D-galacturonic acid give reductic acid in yields of approximately 10% it is also formed on treatment of alginic acid with acid.96,119 The original preparation from pectin has been improved by using ion-exchange techniques,110 and synthetic preparations have been developed.188... 

Suspensions prepared from alginic acid, obtained from Magrocystis pyrlfera (kelp)... 

The natural polymers frequently used for the preparation of pharmaceutical gels include tragacanth, pectin, carrageenan, agar, and alginic acid, as well as semisynthetic polysaccharides such as methylcellulose, hydroxymethylcellulose, and carb-oxymethylcellulose. 

Di-D-galacturonic acids and higher homologues, isolated from enzymic or acid hydrolyzates of pectin, have been studied by many laboratories. Oligogalacturonic acids ( oligosaccharins ) have a variety of regulatory effects in plants.188 A di-D-mannuronic acid was prepared from alginic acid.189... 

Protein content was determined colorimetrically utilizing a BSA standard (11). Protein and alginic acid solutions were prepared in 0.15 N NaCl (saline). Gum arabic solutions were prepared in Milli-Q water. The pH was adjusted with HC1 or NaOH. 

Proof of the structure of the uronic acid was obtained by Hirst, Jones and Jones,46 who isolated the methyl glycoside methyl ester by methyla-tion of the products from the graded methanolysis of alginic acid. The tri-O-methyl-D-mannuronic acid was converted to the diamide of 2,3,4-tri-O-methyl-D-mannaric acid, which had previously been prepared from... 

Fig. 15 Optical images of DNA-based materials for environmental purpose, a DNA-alginic acid hybrid matrix coagulated by Ca2+, in fiber, film, and gel form, b DNA-immobilized porous glass beads prepared by UV-irradiation. c DNA-polyacrylamide hydrogel beads synthesized by inverse suspension polymerization...

Polysaccharides from plants, too, can form gels in water. Pectin is used to help gel jams and fruit preserves. Some polysaccharides are used to thicken foods. Alginic acid, extracted from brown algae, is a linear polymer containing many carboxylic acid groups. The sodium salt is soluble in water and is used as a thickener in the preparation of ice cream and other foods. If a sodium alginate solution is mixed with calcium ion, the polysaccharide pre-... 

In the area of controlled release, the preparation of indomethacin sustained-release microparticles from alginic acid (alginate)-gelatin hydrocolloid coacervate systems has been investigated. In addition, as controlled-release systems for liposome-associated macromolecules, microspheres have been produced encapsulating liposomes coated with alginic... 

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