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'stests. When treated with hydrochloric acid and boiled for several minutes, thesolution showed a positive result. Explain.b. A solution containing only one carbohydrate gave a Cu2O precipitate withBenedict's reagent. Which possible carbohydrates are present in the solution?c. Another sample of the solution from (b) failed to give a Cu2O precipitate withBarfoed's reagent within 5 min. Which carbohydrate is present in the solution?[ 2/5100%FIGURE 1Molisch's testStarch, Sucrose, Galactose, Glucose, Fructose, Xylose, Arabinose, Lactose, MaltoseNon CarbohydratesBenedict's testO Nonreducing(+) ReducingBrick-RedClear BlueStarch, SucroseGalactose, glucose, fructose, xylose, arabinose, lactose, maltoseIodine testBarfoed's test(-) Colourless(+) Brick- Red ppt (5 min)(+)Purple(-) No reaction in 5 minutes(+) Brick- Red ppt in 20 minStarchSucroseMonosaccharide (Galactose, glucose, fructose, xylose, arabinose)Disaccharide (Lactose, maltose)Bial's test(-) Brown(+) BlueHexoses (Galactose, glucose, fructose)Pentoses (Xvlose, Arabinose)Seliwanoff's test(-) No colour (1min) (+) Red colour (1 min)Aldohexoses (Galactose, glucose)Ketohexoses (Fructose)速令

Carbohydrates are found in both healthy and unhealthy foods—bread, beans, milk, popcorn, potatoes,…

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ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter24: Metabolism And Nutrition

Section: Chapter Questions

Problem 43CTQ: Some low-fat or non-fat foods contain a large amount of sugar to replace the fat content of the...

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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
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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