“By rapid stirring”
- Add sodium alginate gradually into the water while stirring using a high speed propeller-type stirrer.
- Keep stirring the solution until all the alginate material is dissolved.
Making a homogeneous solution is the most important procedure to obtain the maximum performance of “ALGIN”, which is a general term for the group of alginic acid, alginate salts and alginate derivatives.
The negatively charged carboxyl groups in alginates cause the straight alginate chains to repel each other and this results in a stable aqueous solution. This aqueous solution has smooth flow properties with Newtonian behavior.
ALGIN is a water-soluble polysaccharide and gives a viscous colloidal solution.
Sodium alginate has a strong affinity with water and care is required to achieve a homogeneous aqueous solution.
It is most important to first prepare a uniform aqueous solution of ALGIN before it is utilized as a thickening agent, gelling agent, etc. Poor dispersion in water will occur if sodium alginate is added too rapidly, producing pasty, flour-like lumps wetted only on the outside.
The solubility of ALGIN in water and solvents is illustrated below.
Table 1: Solubility of ALGIN in various types of solvent
|Type of Alginate||Solubility|
|Cold & Hot water||Fats & Oils||Organic solvents|
|Propylene Glycol Alginate||Soluble||Insoluble||Insoluble|
Table 2: Solubility of ALGIN in various types of solution
|In an acidic system||In an alkaline system||In a solution with polyvalent cations|
|Fruit juice, Sake, Salad dressing, etc.||Lye water, etc.||Hard water, Milk, etc.|
|Propylene Glycol Alginate||Soluble||Soluble||Soluble|
If the alginate is not dispersed uniformly, the powder surface is only wetted and lumps are generated. It takes a considerable time for the lumps to dissolve homogeneously.
If alginate lumps are left in water for a long time, they will swell and dissolve.
Premixed alginate can be easily dispersed with slow stirring speed, lumps are not generated.
Lumps are not generated after the alginate powder starts to swell as the alginate and sugar are well dispersed.
Leave or maintain slow stirring, until a smooth alginate solution is obtained.
Add alcohol to the alginate powder and make a slurry. Increasing the quantity of alcohol makes the alginate easier to disperse.
Add water to the slurry, with stirring, to avoid precipitation of the alginate powder.
Leave or maintain slow stirring, until a smooth alginate solution obtained.
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