food test Flashcards
what food test tests for starch?
iodine test
what is the procedure for the iodine test ?
add iodine solution to starch solution
the result of the iodine test ?
if starch is present it will turn into a blue blackish colour
what is the test to test for reducing sugar ?
benedicts test
the procedure for the benedicts test ?
put benedicts solution and glucose into a test tube and transfer the test tube into a hot water bath using bunsen burner to heat
the result of the benedicts solution?
before heating the solution is blue but after heating the solution turns reddish
what is the food test used to test for protein ?
millon’s test / biuret test
the procedure for the biuret test ?
put millon’s reagent and albumen into a test tube and transfer into hot water bath and using bunsen burner to heat
the result of the biuret test ?
b4 heating it has white precipitate on the surface and after heating it has red precipitate
what is the test for fats ?
emulsion test
the procedure for the emulsion test ?
pour ethanol into cooking oil ,and after shaking it pour that mixture into distilled water .
the result of the emulsion test ?
after pouring the ethanol into distilled water shake it .the solution will turn into a milky emulsion
the food test to test for oils?
grease spot test
the procedure for the grease spot test?
pour cooking oil onto filter paper
the result of the grease spot test?
the opaque filter paper will have a translucent spot
*** what is the test for vitamins?
DCPIP test ( aka Dichlorophenolindophenol
the procedure for the DCPIP test ?
pour the DCPIP solution into a test tube ,pour the vitamin solution into the test tube . while shaking it
the results for the DCPIP test?
if vitamin C is present the blue solution will turn colourless.
