Food Tests

Front

What is a reagent?

Back

A reagent is a chemical that indicates the presence of a substance, usually by changing colour.

Front

What is the initial colour and positive result colour for the Benedict's test for glucose (sugar)?

Back

Initial colour: Blue. Colour of positive result: Brick red precipitate.

Front

What is the method for testing glucose using Benedict's reagent?

Back

Add Benedict’s reagent to the food and boil in a water bath.

Front

What is the initial colour and positive result colour for the iodine test for starch?

Back

Initial colour: Yellow-brown. Colour of positive result: Blue-black.

Front

What is the method for testing starch using iodine reagent?

Back

Add iodine reagent to the food.

Front

What is the initial colour and positive result colour for the Biuret test for proteins/amino acids?

Back

Initial colour: Blue. Colour of positive result: Lilac/purple.

Front

What is the method for testing proteins/amino acids using Biuret reagent?

Back

Add Biuret reagent to the food.

Front

What is the initial colour and positive result colour for the ethanol test for fats?

Back

Initial colour: Clear. Colour of positive result: White emulsion.

Front

What is the method for testing fats using ethanol?

Back

Add ethanol to the food to dissolve the fat then add water.