food tests Flashcards
what is benedicts test for
glucose
in benedicts test for glucose, what colours represent negative and positive
positive : red (high concentration) / yellow- green (low concentration)
negative: blue
what is the iodine solution test for
starch
in the iodine solution test for starch, what colours represent negative and positive
positive: blackish-blue
negative: rusty orange-brown
what is biurets test for
protein
in the biurets test for protein, what colours represent negative and positive
positive: lilac-purple
negative: blue
what is the filter paper test for
dry lipids
in the filter paper test for dry lipids, what colours represent negative and positive
positive: transparent areas
negative: no change
what is the Sudan III test for
wet lipîds
in the sudan III test for wet lipids, what colours represent negative and positive
positive: cloudy (ethanol and water test) / two layers of bright red (sudan III solution)
negative: no change
what elements are carbohydrates made of
carbon, hydrogen, oxygen
what elements are proteins made of
carbon, hydrogen, oxygen and nitrogen
what elements are lipids made of
carbon, hydrogen, oxygen
