concentration: 1and 2 %w
Solvent: deionized water
Storage time: 1 or a few days
Also a layer of mold can be see on it.
Mostly, the solution is made in 0.1% NaCl solution. There are many published literature ae available online. You can read them.
Article The effect of ionic strength on the viscosity of sodium algi...
http://revroum.lew.ro/wp-content/uploads/2014/2/Art%2008.pdf
I send you a fragment of the text Handbook of Hydrocolloids by G.O Phillips and P.A. Williams, 2th edition, 2009:
Stability of alginates
Dry sodium alginate powder may have a shelf-life of several months provided it
is stored in a dry, cool place without exposure to light. In the deep freezer,
sodium alginate may be kept for several years without any significant reduction
of molecular weight. In contrast, dried alginic acid has a very limited stability at ordinary temperatures due to an intramolecular acid catalysed degradation
(Smidsrùd et al., 1966). For many uses, it is important to be aware of the factors
which determine and limit the stability of aqueous alginate solutions and the
chemical reactions being responsible for the degradation. The relative viscosity
of an alginate solution may be severely reduced over a short period of time
under conditions favouring degradation. The glycosidic linkages are susceptible
to both acid and alkaline degradation and oxidation by free radicals. And
because alginates are derived from natural sources, many micro-organisms
digest alginates. Extracellular alginate lyases have been isolated from different
marine and soil bacteria (Gacesa et al., 1989)
Some hydrocolloids when it dissolved in water and stored in solution, in a few days they begin to be affected by microbiological degradation. This degradation causes that viscosity to be lost over time.
Thank you dear @Fabian Leonardo Ramos's. I guess sterilized or biomedical grade alginates don't have this problem. Is it correct?
Hi, as I worked for many years in this field. The sodium alginate solution does not lose viscosity when stored at room temperature. For more details please read my article that is in this regard.
"The influence of polymeric component of bioactive glass-based
nanocomposite paste on its rheological behaviors and in vitro responses: Hyaluronic acid versus sodium alginate."
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