Alginate and Calcium

Calcium alginate refers to a cream-colored, water-insoluble substance that is cultivated from seaweed and salt. It is an edible substance that has uses in the food industry, drug manufacturing, scientific research and the medical field.

Preparation

The preparation of calcium alginate begins when alginic acid is derived from seaweed. The alginic acid is then mixed into a hot solution and subjected to a complex filtering process until sodium alginate forms. The sodium alginate is then removed from the solution and mixed with a calcium salt solution, forming calcium alginate.

Food and Drugs

In its natural form, calcium alginate is a gelatinous substance that is non-toxic. It is used in science experiments to produce "edible slime." It is also used by the food industry to thicken their products or to provide a more palatable gel covering for certain drugs.

Cell Immobilization

Its physical propensity to emulsify and thicken helps to immobilize enzymes and cells. Cells from bacteria, yeasts, plants, mammals, insects and fungi have all been successfully immobilized by calcium alginate. The ability to immobilize enzymes and cellular structures is beneficial in medical and scientific research.

Dressings

Calcium alginate is used in medical dressings, along with other types of alginate substances. These types of dressings are used because they absorb well, making them particularly useful for wounds that secrete bodily fluids. In addition to helping with the wound drainage, the dressings secrete a gel that provides therapeutic comfort to the wound itself.

References

• "Cell Adhesion: Fundamentals and Biotechnological Applications"; Martin A. Hjortso and Joseph W. Roos; 1994
• "Wound Care Essentials: Practice Principles"; Sharon Baranoski and Elizabeth A. Ayello; 2007
• "Immobilization of Enzymes and Cells (Methods in Biotechnology)"; Jose M. Guisan; 2006
• Worldwide Wounds: Alginate Dressings FAQ
• Cell Immobilization with Calcium Alginate
• Lessons Plan Page: Edible Slime