Question

1. predict the biochemical test results for the following food items: food item benedicts solution iodine sudan iv biuret reagent non - coloured, non - diet soft drink baked potato with butter skim milk

Explanation:

Step1: Analyze non - coloured, non - diet soft drink

Soft drinks usually contain simple sugars. Benedict's solution is used to detect reducing sugars, so it will give a positive result (change to a coloured precipitate like brick - red). Iodine is for starch detection, so negative. Sudan IV is for fats, so negative. Biuret reagent is for proteins, so negative.

Step2: Analyze baked potato with butter

Potatoes have starch, so positive with iodine. Butter has fats, so positive with Sudan IV. Potatoes may have some reducing sugars, so a weak positive or negative with Benedict's solution depending on the ripeness. Biuret reagent may give a negative result as protein content is low.

Step3: Analyze skim milk

Skim milk has lactose (a reducing sugar), so positive with Benedict's solution. It has little to no starch, so negative with iodine. It has little fat (being skim), so negative with Sudan IV. It has proteins, so positive with Biuret reagent.

Food Item	Benedict's solution	Iodine	Sudan IV	Biuret reagent
Baked potato with butter	Weak positive/negative	Positive	Positive	Negative
Skim milk	Positive	Negative	Negative	Positive

Answer:

Food Item	Benedict's solution	Iodine	Sudan IV	Biuret reagent
Baked potato with butter	Weak positive/negative	Positive	Positive	Negative
Skim milk	Positive	Negative	Negative	Positive