food tests Flashcards by Lydia Hall

Q

what is the test for the presence of sugar in a sample

A

add benedictus reagent to sample
boil test tube in a hot water bath
if present, brick red precipitate is formed

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Q

what is the test for protein

A

add biuret reagent and shake
if present turns from blue to purple

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Q

what is the test for lipids

A

add ethanol to the sample then water and shake
if present, white emulsion formed

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