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Author Question: Do any of the pigments change color when heated for a long period of time? Which? Explain the ... (Read 56 times)

chads108

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on: Aug 19, 2018
Do any of the pigments change color when heated for a long period of time? Which? Explain the reaction.

Question 2

Compare the colors of the vegetables used when cooked in acid and alkaline cooking water. Which are the predominant pigments in these vegetables?


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ApricotDream

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Reply #1 on: Aug 19, 2018
Answer to Question 1

Red cabbage changed to a dark blue after being cooked for about 25 minutes. Also, cooking the cauliflower for a long time turned it a pink color.

Answer to Question 2

When acid was added to broccoli, it turned brown. When a base was added, the broccoli turned bright green, but became mushy in texture. The predominant pigment in broccoli is chlorophyll. When acid was added to carrots, they turned a bright orange, but when a base was added, they turned a dark orange; the pigment in carrots is beta-carotene. When acid was added to red cabbage, it turned a purple shade, and when a base was added it turned a green/blue shade; the pigment in red cabbage is anthocyanin. When an acid was added to cauliflower, it stayed white, and it turned yellow when a base was added; the predominant pigment in cauliflower is anthoxanthin.


chads108

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Reply #2 on: Aug 19, 2018
Both answers were spot on, thank you once again


ApricotDream

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Reply #3 on: Aug 19, 2018
Great! Please up vote :D


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