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The molecular structures of different types of carrageenan. Carrageenans are large, highly flexible molecules that form curling helical structures. This gives them the ability to form a variety of different gels at room temperature. They are widely used in the food and other industries as thickening and stabilizing agents.
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The following other wikis use this file: Usage on cs.wikipedia.org Karagenan; Usage on de.wikipedia.org Carrageen; Usage on el.wikipedia.org Καραγενάνη
Poligeenan is produced by the harsh acid degradation of carrageenan. Carrageenan in solution is processed at low pH (~1.0) and high temperature (90 °C (190 °F)) for up to six hours until the weight-average molecular weight (M w) has been reduced to the range 10,000 – 20,000 daltons (10–20 kDa).
Iota-carrageenase (EC 3.2.1.157) is an enzyme with systematic name iota-carrageenan 4-beta-D-glycanohydrolase (configuration-inverting). [1] [2] [3] This enzyme catalyses the following chemical reaction
Differences in carrageenan chemistry, with Hypneaceae species producing kappa-carrageenan and Cystocloniaceae producing lambda-carrageenan, was another reason for their distinction. [5] However, these criteria were questioned and molecular analysis later showed that the two families had similar vegetative and reproductive characters.
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Two bacteria which produce lambda-carrageenase have been found. The marine bacterium Pseudoalteromonas carrageenovora (also known as Alteromonas carrageenovora) strain ATCC 43555, which was isolated from sea water in Nova Scotia, and the deep-sea bacterial isolate Pseudoalteromonas sp. CL19, which was isolated from a sediment sample from Suruga Bay, Japan.