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A2033 Sigma

Alginic acid sodium salt from brown algae

Medium viscosity

Synonym: Algin, Sodium alginate



Other Notes

A straight-chain, hydrophilic, colloidal, polyuronic acid composed of glucuronic and mannuronic acid residues.


1 kg in poly bottle

100, 250, 500 g in poly bottle


Alginate, a colloidal polyuronic acid structural molecule capable of gelation, is used in the preparation of colloidal biodegradable structures such as gels, biofilms, beads, nanoparticles, and microcapsules suitable for applications that range from gel based separation technologies to drug delivery and cell preservation.

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Safety Information

NONH for all modes of transport
WGK Germany 

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option: http://www.sigmaaldrich.com/catalog/AdvancedSearchPage.do
What is the molecular weight of alginic acid sodium salt, Product A2033?
The molecular weight of alginic acid sodium salt ranges between 80,000 - 120,000.
What is the ratio of mannuronic acid and guluronic acid (M/G) in alginic acid sodium salt, Product A2033?
Alginic acid is a linear polymer of B-(1-->4)-D-mannosyluronic acid and a(1-->4)-L-gulosyluronic acid residues, the relative amounts of which vary with the botanical source and the state of maturation of the plant. Typically, material is composed of approx. 61% mannuronic and 39% guluronic acid or a M/G ratio of 1.56.
Can you use alginic acid sodium salt, Product A2033, as a support/gel?
Yes. Here are some references for preparing alginic acid sodium salt as a support: Adaoha Mbanaso, E.N. and Roscoe, O.H., Plant Sci. Lett., 25, 61-66 (1982); Chee, R. and Cantliffe, D.J., In Vitro Cell. Develop. Biol., 25, 757 (1989); Draget, K.I., et al., Plant Physiol., 132, 552 (1988); Larkin, P.J., et al., Plant Sci., 58, 203 (1988).
How do I find price and availability?
There are several ways to find pricing and availability for our products.  Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers. 
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS. To access the shipping information for this material, use the link on the product detail page for the product, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
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