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”

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Conclusions/Reasons:

The egg yolk “contains all of the egg's fat and cholesterol, and almost half of the protein.” [Wikipedia]; this can explain the traces of protein found, and the great amounts of fat found.

The pasta had a trace of protein which may have probably been from the egg, as many times pasta is made with egg, as an ingredient.

The tomato’s seeds were not tested. If they were, the results would have been different from the results obtained. The tomato also has a majority of its composition consisting of sugars, and carbohydrates, and this hence explains the presence ...

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