Results of Carbohydrate Tests
Table 1. Reactions for Reducing Sugars and Starch
Benedict’s Reaction
Tube Solution
Final color and conclusions
1 1ml onion juice Cloudy Yellow
2 1ml potato juice Cloudy Blue
3 1ml 1% sucrose solution Clear Blue
4 1ml 1% glucose solution Cloudy Brown
5 1ml distilled water Clear Blue
1ml 1% reducing sugar (fructose)
6 Cloudy Red
solution
7 1ml 1% starch solution Cloudy Green
8 1ml of your unknown solution Dark Blue
Which one of the solutions is the positive control, and which one of the solutions is the negative
Question 1 reaction?
The solution that had postive control was fructose, and the solution that had a negative cont
Benedict's reaction.
Question 2 Which contains more reducing sugars, potato juice or onion juice? How do you know?
The juice that contained more reducing sugars was the onion juice because the reaction was
, Which one of the solutions is the positive control, and which one of the solutions is the negative
Question 3 reaction?
The solution that had postive control was starch, and the solution that had a negative contro
Iodine reaction.
Question 4 Which colors more intensely for the Iodine Reaction, onion juice or potato juice? Why?
Potato juice colored was more intense for the Iodine Reaction because it had a greater color
,gars and Starch
Iodine Reaction
Final Color and Conclusions
Yellowish Brown ( - , 0.01 )
Bluish Black ( + , 0.1 )
Yellow ( -, 0.0% )
Yellow ( -, 0.0% )
Yellow ( -, 0.0% )
Yellow ( -, 0.0% )
Bluish Black ( + , 0.1 )
Yellow ( -, 0.0% )
utions is the negative control for the Benedict's
had a negative control was distilled water for the
you know?
use the reaction was a yellowish color.
Table 1. Reactions for Reducing Sugars and Starch
Benedict’s Reaction
Tube Solution
Final color and conclusions
1 1ml onion juice Cloudy Yellow
2 1ml potato juice Cloudy Blue
3 1ml 1% sucrose solution Clear Blue
4 1ml 1% glucose solution Cloudy Brown
5 1ml distilled water Clear Blue
1ml 1% reducing sugar (fructose)
6 Cloudy Red
solution
7 1ml 1% starch solution Cloudy Green
8 1ml of your unknown solution Dark Blue
Which one of the solutions is the positive control, and which one of the solutions is the negative
Question 1 reaction?
The solution that had postive control was fructose, and the solution that had a negative cont
Benedict's reaction.
Question 2 Which contains more reducing sugars, potato juice or onion juice? How do you know?
The juice that contained more reducing sugars was the onion juice because the reaction was
, Which one of the solutions is the positive control, and which one of the solutions is the negative
Question 3 reaction?
The solution that had postive control was starch, and the solution that had a negative contro
Iodine reaction.
Question 4 Which colors more intensely for the Iodine Reaction, onion juice or potato juice? Why?
Potato juice colored was more intense for the Iodine Reaction because it had a greater color
,gars and Starch
Iodine Reaction
Final Color and Conclusions
Yellowish Brown ( - , 0.01 )
Bluish Black ( + , 0.1 )
Yellow ( -, 0.0% )
Yellow ( -, 0.0% )
Yellow ( -, 0.0% )
Yellow ( -, 0.0% )
Bluish Black ( + , 0.1 )
Yellow ( -, 0.0% )
utions is the negative control for the Benedict's
had a negative control was distilled water for the
you know?
use the reaction was a yellowish color.
