enzymes (food tests)

define enzymes

biological catalyst that speeds up reactions.

what is the lock and key method

the enzyme is the lock, and the substrate is the key. Once the substrate fits into the enzyme, the enzyme helps speed the reaction. Then when the process is done, the substrate changes but the enzyme stays the same.

How to test for glucose

Use benedict’s solution

start is blue colour

green in low concentration

red in high concentration

test for starch

use iodine solution

start is orange colour

results is blue black.

results for protein

use biuret solution

start colour blue

end colour purple

How to test for lipids

Sudan III solution

results- red.