Carrageenan is extracted from the raw material with water at high temperatures.
The liquid extract is purified by centrifugation and/or filtration. The
liquid extract may be converted into a powder by simple evaporation of
water to yield the so called drum dried carrageenan. Proper release of
the dried material from the dryer roll requires addition of a small amount
of roll-stripping agents (mono- and diglycerides).
The content of mono- and diglycerides is responsible for the drum dried
carrageenans being turbid in watery solutions, and drum dried carrageenan
consequently finds little use in water gel applications. Also, drum dried
carrageenans contain all soluble salts present in the extract, which may
influence the properties - for instance solubility of the carrageenan.
Most of the carrageenan used in foods is isolated from the liquid extract
by selective precipitation of the carrageenan with isopropanol. This process
gives a more pure and concentrated product.
The flow sheet below describes in general the process used by CP Kelco
ApS
Product Information
| Raw Materials |
Manufacture | Structure
| Solubility | Reactions
| Gelling Mechanism |
Commercial | Applications
| Selection Guide
|
