Question of the day'

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Question of the day.
Which of the compounds below would you expect to
have a color (to human eyes) ? Why?
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Today Conclusion of Plant Pigments Study
lectures and Reader on Plant Odors and Plant
Pigments ..
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Plant Pigments

• Carotenoids
• Tannins
• Anthocyanins
• Betalains
• Flavonoids

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Electromagnetic Spectrum
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Carotenoids C40
b-carotene C40H56
Water-solubility ?
Vitamin A Retinol
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Anthocyanin Colors

Hydrangeas
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Anthocyanins

Next class Experiment!
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Anthocyanin Colors

• are influenced
• by the pH of plant saps
• by their concentration
• by mineral content, especially aluminum ions

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Betalains
in plants of the order Caryophyllales Cacti,
Portulacaceae, Chenopodiaceae, Nyctaginaceae ..
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• Tannins
• acidic
• bitter
• astringent
• antifungal

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Tannins
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• Characteristics of tannins
• soluble in water, with the exception of some high
  molecular weight structures
• have the ability to bind to proteins (e.g.
  enzymes in gut of insects!) and to form insoluble
  tannin-protein complexes.

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Flavonoids
Luteoline
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Flavonoids and UV-Light
Dandelion under UV-light
Dandelion in daylight
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