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nutrition and food tests (fats/lipids (glycerol, fatty acid, fatty acid,…
nutrition and food tests
carbohydrate
.
simple sugars = glucose & lactose
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complex molecules = starch & cellulose & glycogen
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starch
storage carbohydrate in plants
when we eat starch it breaks down into glucose
gylcogen
storage carbohydrate in animals
stored in muscles
can be broken it glucose when we run out of sugar
cellulose
found in plant cell walls
we cant digest it but it adds fiber- helps push food though digestive system and consipation
provides energy
simple sugars release energy fast
starch releases energy more slowly
sources
simple
biscuits
cakes
jam
fizzy drinks
starch
potatoes
rice
pasta
bread
contain
Carbon
Oxygen
Hydrogen
fats/lipids
glycerol
fatty acid
fatty acid
fatty acid
provide energy
streaky bacon
cheese
other dairy products
lard
contain
Carbon
Oxygen
Hydrogen
protein
nitrogen
made of amino acids (there are 20 different amino acids)
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when eaten>breaks into amino acids --> absorbed into blood and body cells
Used to make different proteins>
enzymes
haemoglobin
antibodies
growth and repair
energy if carbs and fats are low
sources
lean meat
beans
fish
egg white
.
contain
Carbon
Oxygen
Hydrogen
protein
biuret test
add biuret to a solution of food and shake
blue > lilac
fats
ethanol
mix the fat with ethanol add some water and shake
colorless > white emulsion
simple sugar
benedicts test
add benedicts solution to food + heat in water bath
blue > green > orange > brickred
starch
starch test
(iodine)
add iodine solution to food
yellow-brown>black
others
water
fiber
vitamins and minerals