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Carbohydrate Identification Lab
Results & Conclusion
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Results: Which of the solutions reacted to Benedict’s Solution?
Monosaccharide-Known Honey Apple Juice Milk (in some classes)
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Results: Which of the solutions reacted to Iodine Solution?
Polysaccharides Oat Water Rice Water Milk (a little bit)
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Results: Which of the solutions did not react at all?
Disaccharides Sugar Water
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Conclusion: (a) Mono, Di or Polysaccharides?
Reaction with Benedict’s Monosaccharides Present Benedict’s only reacts with Monosaccharides Honey, Apple Juice and Milk contains monosaccharides You saw a orange-yellow-brown color change, resulting from Benedict’s solution!
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Conclusion: (b) Structure of Molecules & Benedict‘s
Reacted w/Benedict’s Monosaccharide Monosaccharide = 1 sugar Structure of Honey, Apple Juice & Milk: The carbohydrate was made of individual, single sugar units. Most likely glucose or fructose.
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Conclusion: (c) Mono, Di, or Polysaccharides?
Reaction with Iodine Polysaccharides Present Iodine only reacts with Polysaccharides Oat Water, Rice Water & Milk contains polysaccharides You saw a blue-black color change, resulting from Iodine reaction!
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Conclusion: (d) Structure of Molecules & Iodine
Reacted w/Iodine Polysaccharides Polysaccharide = Many Sugars Structure of Oat Water, Rice Water & Milk: The carbohydrates were large molecules, made of repeating sugar units. Most likely starchy.
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Conclusion: (e) Mono, Di, Polysaccharides?
No Reaction Disaccharide No Color Change Ever Disaccharide Sugar Water must contain disaccharides
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Conclusion: (f) Structure of Molecules & Nada
No Reaction Disaccharides Disaccharide = 2 or Double Sugar Structure of Sugar Water: Made of double sugar units Most likely sucrose or sucralose
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Conclusion: (g) Solutions & Long Energy
Oat Water & Rice Water: Largest Carbohydrates Most Bonds Most Energy over Long Period
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Conclusion: (h) Solutions & Quick Energy
Honey & Apple Juice: Small Carbohydrates Few Bonds Little Energy over Short Period
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