You are given the following carbohydrates: glucose, maltose, sucrose, and starch. Explain the results described below. a. A carbohydrate solution gave a negative result in the Benedict's and Barfoed's tests. When treated with hydrochloric acid and boiled for several minutes, the solution showed a positive result. Explain. b. A solution containing only one carbohydrate gave a Cu2O precipitate with Benedict's reagent. Which possible carbohydrates are present in the solution? c. Another sample of the solution from (b) failed to give a Cu2O precipitate with Barfoed's reagent within 5 min. Which carbohydrate is present in the solution?[

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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A. You are given the following carbohydrates: glucose, maltose, sucrose, and starch. Explain the results described below. a. A carbohydrate solution gave a negative result in the Benedict's and Barfoed's tests. When treated with hydrochloric acid and boiled for several minutes, the solution showed a positive result. Explain. b. A solution containing only one carbohydrate gave a Cu2O precipitate with Benedict's reagent. Which possible carbohydrates are present in the solution? c. Another sample of the solution from (b) failed to give a Cu2O precipitate with Barfoed's reagent within 5 min. Which carbohydrate is present in the solution?[
2/5
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FIGURE 1
Molisch's test
Starch, Sucrose, Galactose, Glucose, Fructose, Xylose, Arabinose, Lactose, Maltose
Non Carbohydrates
Benedict's test
O Nonreducing
(+) Reducing
Brick-Red
Clear Blue
Starch, Sucrose
Galactose, glucose, fructose, xylose, arabinose, lactose, maltose
Iodine test
Barfoed's test
(-) Colourless
(+) Brick- Red ppt (5 min)
(+)Purple
(-) No reaction in 5 minutes
(+) Brick- Red ppt in 20 min
Starch
Sucrose
Monosaccharide (Galactose, glucose, fructose, xylose, arabinose)
Disaccharide (Lactose, maltose)
Bial's test
(-) Brown
(+) Blue
Hexoses (Galactose, glucose, fructose)
Pentoses (Xvlose, Arabinose)
Seliwanoff's test
(-) No colour (1min) (+) Red colour (1 min)
Aldohexoses (Galactose, glucose)
Ketohexoses (Fructose)
速
令
Transcribed Image Text:2/5 100% FIGURE 1 Molisch's test Starch, Sucrose, Galactose, Glucose, Fructose, Xylose, Arabinose, Lactose, Maltose Non Carbohydrates Benedict's test O Nonreducing (+) Reducing Brick-Red Clear Blue Starch, Sucrose Galactose, glucose, fructose, xylose, arabinose, lactose, maltose Iodine test Barfoed's test (-) Colourless (+) Brick- Red ppt (5 min) (+)Purple (-) No reaction in 5 minutes (+) Brick- Red ppt in 20 min Starch Sucrose Monosaccharide (Galactose, glucose, fructose, xylose, arabinose) Disaccharide (Lactose, maltose) Bial's test (-) Brown (+) Blue Hexoses (Galactose, glucose, fructose) Pentoses (Xvlose, Arabinose) Seliwanoff's test (-) No colour (1min) (+) Red colour (1 min) Aldohexoses (Galactose, glucose) Ketohexoses (Fructose) 速 令
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