Nutrients in Food Lab Report

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Nutrients in Food

Lab Report (C1)

Positive test - Tests that will determine if certain substances are present in many 'complex' foods:

Starch: Iodine turns blue black when added

Protein: Biuret test - If the foodstuff contains soluble protein, the reagent turn from light blue to purple

Fat: Reagent forms a white cloudy precipitate

Simple Sugars: Benedict's solution - when added, and once heated, Benedict's will turn dark orange-red

Below is the data collected; if a certain substance such as starch, protein, fat or sugars are present, then in the table, it will be marked positive (+ve), and will have a remark, 'yes', next to it. If a substance is not present, then it will be marked negative (-ve) with a remark of 'no.' Though in some cases, there will be a trace of some substances, meaning there was a slight formation of the precipitate or the substance was slightly present, in extremely small amounts. This, on the table will be marked as "-ve though a slight trace"

Food

Starch

Protein

Fat

Simple Sugars

Egg Yolk

-ve/no

-ve though slight trace

+ve/ yes