Alginic Acid (Low Viscosity 100-300 cP, MW 10k-600k)

Cat No:MCH-0001

Description

Native alginic acid, the protonated form of the brown-algae polysaccharide whose sodium and calcium salts are known as alginates. A linear copolymer built from (1-4)-linked beta-D-mannuronate (M) and its C-5 epimer L-guluronate (G), the residues appear in consecutive G-blocks, M-blocks or alternating MG-blocks that determine gel behavior. Offered as a low viscosity grade of 100-300 cP with typical molecular mass from 10k to 600k; the material presents as white to yellowish-brown filamentous, granular or powdered forms.

Datasheet

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Basic Information

Brand	Eata Marisource
Product Grade	Native hydrocolloid grade
Chemical Name	Alginic acid (unmodified)
Molecular Weight	Typical range 10k to 600k
Raw Material Source	Brown algae (Phaeophyceae)
Physical Form	Powder; may also present as filamentous or granular material
Appearance	White to yellowish-brown
Color	White to yellowish-brown
Odor	Odorless
Viscosity	Low viscosity 100-300 cP (typical 1% solutions)
Viscosity Test Conditions	Measured on aqueous solutions at 25 degrees C, Brookfield
Molecular Weight Range	10k-600k; characterized by viscosity in practice
Solubility	Slowly soluble in water with alkaline adjustment; forms viscous solutions as the soluble salt
Water Solubility	Limited as the free acid; dissolves on neutralization to alginate salts
Solubility in Organic Solvents	Insoluble in ethanol and organic solvents
Storage Temperature	Cool, dry storage conditions recommended
Storage Conditions	Keep sealed in a dry place; avoid moisture uptake which causes caking
Allergen & Dietary Statement	Not a listed allergen; seaweed-derived polysaccharide
Intended Use	Hydrogel preparation, biocomposites, wound dressing materials, dehydrating additive applications
Target Industries	Biomaterials, pharmaceutical development, food and industrial applications
Recommended Applications	Calcium alginate hydrogel formation; wound dressing matrices; biocomposite scaffolds; moisture management additives
Chemical Class	Anionic linear polysaccharide (free acid form)
Structural Unit	(1-4)-linked beta-D-mannuronate (M) and alpha-L-guluronate (G) in G-blocks, M-blocks and alternating MG-blocks
Functional Groups	Carboxylic acid groups on uronate residues
Ionic Character	Anionic once neutralized; free acid form is weakly dissociated
Key Features	Unmodified native polymer; M/G block architecture intact; low viscosity grade for easy processing
Functional Benefits	Starting material for salt and derivative preparation with full traceability to the native algae polymer
Mechanism of Action	Carboxylates bind divalent cations such as calcium to form egg-box gels; the acid form converts readily to soluble salts
Typical End Products	Alginate salts, hydrogels, wound dressings, biocomposite matrices
Formulation Compatibility	Converts to sodium alginate on neutralization; compatible with calcium crosslinking workflows
Preparation & Dissolution Guidance	Disperse in water and neutralize gradually with base to form the soluble alginate; avoid strong acid conditions
Reactivity & Derivatization	Carboxyl groups neutralize with monovalent bases and gel with divalent cations
Stability Notes	Stable as dry powder; aqueous dispersions are microbiologically sensitive
Usage Precautions	Hygroscopic; reseal promptly and store away from humidity
Environmental Profile	Naturally occurring marine polysaccharide; biodegradable
Analytical Methods	M/G ratio by NMR or CD; viscosity for grade identity; moisture content; ash on calcination

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