Food tests Flashcards

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1
Q

what does the Starch-Iodide Test test for

A

starch

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2
Q

what are the results when starch is present

A

the iodine turns from yellowish-orange to blue-black

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3
Q

what are the results when starch is absent

A

the mixture remains yellowish-orange

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4
Q

what does the Biuret Test test for

A

protein

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5
Q

what are the results when protein is present

A

the mixture turns from blue to violet/lilac

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6
Q

what are the results when protein is absent

A

the mixture remains blue

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7
Q

what does the Benedict’s Test test for

A

reducing sugar

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8
Q

what does it mean when a brick red precipitate was obtained from a blue mixture

A

a large amount of reducing sugar is present

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9
Q

what does it mean when an orange precipitate was obtained from a blue mixture

A

a moderate amount of reducing sugar is present

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10
Q

what does it mean when a yellow precipitate was obtained from a blue mixture

A

a low amount of reducing sugar is present

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11
Q

what does it mean when a green precipitate was obtained from a blue mixture

A

a trace amount of reducing sugar is present

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12
Q

what does the Ethanol Emulsion Test test for

A

lipids/fats

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13
Q

what does it mean when a white emulsion is formed when water was added

A

fat/lipid is present

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14
Q

what does it mean when the mixture remained clear when water was added

A

fat/lipid is absent

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15
Q

description of starch-iodide test

A

add 1 drop of iodine solution on white tile, followed by 1 drop of test solution and mix well. Observe any colour change

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16
Q

description of biuret test

A

add test solution to test tube, add biuret reagant to test solution. shake to mix and observe for colour change

17
Q

description of Benedict’s test

A

add test solution to test tub, add Benedict’s solution to test tube and swirl. leave test tube in a boiling water bath for 3 min and observe for formation of precipitate (colour change)

18
Q

description of ethanol emulsion test

A

add ethanol to test solution in a test tube. mix well and allow to stand for 2 min. decant the ethanol into another test tube containing water. mix well. observe for white suspension.