Food tests Flashcards
what does the Starch-Iodide Test test for
starch
what are the results when starch is present
the iodine turns from yellowish-orange to blue-black
what are the results when starch is absent
the mixture remains yellowish-orange
what does the Biuret Test test for
protein
what are the results when protein is present
the mixture turns from blue to violet/lilac
what are the results when protein is absent
the mixture remains blue
what does the Benedict’s Test test for
reducing sugar
what does it mean when a brick red precipitate was obtained from a blue mixture
a large amount of reducing sugar is present
what does it mean when an orange precipitate was obtained from a blue mixture
a moderate amount of reducing sugar is present
what does it mean when a yellow precipitate was obtained from a blue mixture
a low amount of reducing sugar is present
what does it mean when a green precipitate was obtained from a blue mixture
a trace amount of reducing sugar is present
what does the Ethanol Emulsion Test test for
lipids/fats
what does it mean when a white emulsion is formed when water was added
fat/lipid is present
what does it mean when the mixture remained clear when water was added
fat/lipid is absent
description of starch-iodide test
add 1 drop of iodine solution on white tile, followed by 1 drop of test solution and mix well. Observe any colour change
