B3: Food Tests RP, Bile, Enzymes table

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Test for starch

Include colour of positive test

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16 Terms

1

Test for starch

Include colour of positive test

Add iodine to food on spotting tile

Positive for starch = iodine goes blue black

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2

Test for glucose

include positive colour

Food in Benedict’s solution

Heat in hot water bath 3 mins

Solution goes brick red = contains sugar

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3

Test for protein

Include pos colour

Mix food with Biuret solution

Leave 2min

If mixture goes pale purple = contains protein

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4

Food test for lipids not in spec - don’t need to revise

This is only the food test for lipids, I still need to know about the enzymes etc involving lipids

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5

Where is bile produced

liver

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6

Where is bile stored

gallbladder

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7

2 things bile does

  1. Increases pH of food as it enter small intestine

  2. emulsification: turns fats to small droplets (increasing their SA)

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8

So how does bile help lipase enzymes

Bile helps lipase enzymes by emulsifying fats into smaller droplets, which increases the surface area for lipase to act upon, enhancing fat digestion. (speeds up rate of reaction)

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9

Which 2 places are ALL enzymes produced

small intestine

pancreas

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10

Where is hydrochloric acid and what does it do

Stomach

provides best acidic conditions for protease enzymes to break down protein

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11

Starch → ?

enzyme?

glucose

amylase enzyme

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12

protein → ?

with what enzyme

amino acids

protease enzyme

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13

Fats → ?

which enzyme

fatty acids and glycerol

lipase enzyme

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14

Amylase is produced where (3)

pancreas

small intestine

salivary glands

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15

protease produced where (3)

pancreas

small intestine

stomach

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16

lipase produced where

pancreas

small intestine

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