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Some examples from this set of practice questions
1.
Which type of carrageenan contains 2 SO3- groups?
Answer: iota carrageenan
2.
What are the two monomers in the backbone of carrageenan
Answer: galactosyl and anhydrogalactosyl
3.
Which type of carrageenan contains no anhydrogalactosyl?
Answer: Lambda carrageenan
4.
Which types of carrageenan can form a gel?
Answer: Kappa and iota
5.
Why is lambda carrageenan not able to make a gel?
Answer: Because it contains no anhydrogalactosyl which is needed for helix formation
6.
What kind of gel gives kappa carrageenan?
Answer: A brittle gel that gives syneresis
7.
What kind of gel gives iota carrageenan?
Answer: An elastic gel that is stable upon freezing and thawing.
8.
How is a gel formed with kappa carrageenan?
Answer: Helix is formed by carrageenan molecules (galactosyl and anhydrogalactosyl). Different helices are connected by potassium (K) moleculess that form a salt bridge. The potassium reduces the charge so the helixes can come together and the radius of potassium stabilizes the molecules
9.
How is a gel with iota-carrageenan formed?
Answer: Helixes are formed because of the interaction between galactosyl and anhydrogalactosyl in the carrageenan molecules. These helixes can aggregate because of calcium ions (divalent)
10.
How can kappa carrageenan stabilize a chocolate milk drink?
Answer: It forms complexes with milk proteins when milk proteins are positive and carrageenan is negative. If milk proteins are positive because of the pH, there will be salt bridges formed between the milk protein and carrageenan helix. Besides that, there are also salt bridges between the different carrageenan molecules to form a network.
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