Question

question 7
1 pts
part 2:
d: you are trying to identify an unlabeled container of yellowish jelly - like substance from your refrigerator. it is either

• an aspic (jello type stuff made from gelatin which is solid protein ), or
• a fruit chutney (contains reducing sugar and starch), or
• a meat glaze (contains protein and starch).

you test the substance with some of the tests you learned in the lab, and the results are shown below. fill in the blanks in the table and identify the substance.

test used	result observed	explain the result
iodine	turned black	starch present
biuret	remained blue	no proteins

the substance is fruit chutney

Explanation:

Step1: Analyze Benedicts test

Benedicts test turns red in presence of reducing sugar. But here the explanation in the table for Benedicts test result about starch presence is incorrect. Starch is not detected by Benedicts test.

Step2: Analyze Iodine test

Iodine turns black - blue in the presence of starch. Since it turned black, starch is present.

Step3: Analyze Biuret test

Biuret test remains blue if no proteins are present. As it remained blue, there are no proteins.

Step4: Identify the substance

Fruit chutney contains reducing sugar and starch and no solid - protein like in aspic or meat glaze. So the substance is fruit chutney.

Answer:

The substance is fruit chutney.