Question

collect data: use the four available tests to find the nutritional content of samples on the table below. (sample a has been done for you as an example.) record the results.

	carbohydrate tests	protein test	lipids test	test results – are these nutrients present?
food sample	benedict test	lugol test	biuret test	sudan red test	mono - saccharides	starches	proteins	lipids
a	+	-	-	-	yes	no	no	no
b
f
h
i
m

which sample came from each person? how do you know?

Explanation:

Step1: Recall Nutrient Test Principles

• Benedict test: Detects monosaccharides (e.g., glucose). Positive = color change (e.g., blue to orange/red).
• Lugol test: Detects starches. Positive = blue-black color.
• Biuret test: Detects proteins. Positive = purple color.
• Sudan Red test: Detects lipids. Positive = red-stained droplets.

Step2: Apply Tests to Samples (Example Workflow)

For a food sample (e.g., Sample B):

1. Perform Benedict test: Observe color. If +, monosaccharides = Yes; else No.
2. Perform Lugol test: Observe color. If + (blue-black), starches = Yes; else No.
3. Perform Biuret test: Observe color. If + (purple), proteins = Yes; else No.
4. Perform Sudan Red test: Observe droplets. If + (red), lipids = Yes; else No.

(Note: Since no specific sample data is filled, the process involves conducting each test and recording results as per the color/observation changes.)

Answer:

The process involves using each test (Benedict, Lugol, Biuret, Sudan Red) on each food sample, observing color changes/droplets, and recording "Yes" or "No" for each nutrient (monosaccharides, starches, proteins, lipids) based on test results. For example, if Sample B's Benedict test is +, monosaccharides = Yes; if Lugol test is -, starches = No, etc. (Actual results depend on the food sample's composition and test observations.)