Chemicals for Consumers:Food Preservatives
Transcript of Chemicals for Consumers:Food Preservatives
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What is Food Additives?!!!?!!?!?!?!? Wikipedia:
Substances added to food to preserve flavor orenhance its taste and appearance.Textbook: Added to food so that they last longer, make food
more appetizing and delicious.
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Typ es of FOOD ADDITIVESType of food additive ExamplesP reservatives Sodium Nitrite, sodium benzoate
Antioxidants Ascorbic Acid
Flavouring agents Monosodium Glutamate (MSG, Ajinomoto), aspartame,
Stabilizers and thickening agents Acacia gum,
Dyes azo compounds, triphenyl compounds
OMG!Have tomemorize!
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Pr ese r vativesC hemicals that are added to food to RETARD
microorganisms growth
P reserving Strawberries using Sugar Yum Yum!
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C ommon Pr ese r vativesPr ese r vative Molecula r Fo r mula Uses
Sodium nitriteSodium nitrate NaNO2
NaNO 3To preserve meat, sausagecheese..Maintain meats natural
colour
Benzoic acidSodium benzoate
C 6 H 5C OOHC 6 H 5C OONa
To preserve sauces, juices, jam, margarine
Sulphur DioxideSodium Sulphite
SO2Na 2SO3
Used as Bleaches andantioxidantsMaintain colour and
freshness of veggiesP revent microorganism
growth
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Antioxidants Antioxidants are chemicals that are added to
food, preventing oxidation of fat and oils.Oxidised food are rancid. Rancid food are volatile organic compounds with bad smell-example Butanoic Acid ( C 3H 7C OOH)
C omparison betweenoxidised apple andunoxidised
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Flavoring agents
Two Types
ArtificialFlavours
FlavourEnhancers
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Flavou r Enhance r
L ittle or no taste.
Added to enhance or bring out the taste of foodExample: Monosodium Glutamate/Ajinomoto
Malaysias favoriteadditive: Ajinomoto
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Ar tificial Flavou r sI ncludes sweeteners and peppermint, vanilla
flavours.Example: Aspartame, saccharinSome esters can also be used. Examples
Este r B enzylethanoate
Octylethanoate
Ethylethanoate
Flavour Strawberry Orange P ineapple
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Stabilise r sI mproves the texture and blending in food
They are emulsifiers (allows water and oil to blend)Ex: Gelatin, acacia gum, lecithin, pectinStabilisers improves the texture of:
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Thickening AgentsThickens the liquids in food and prevents
liquefaction.They absorb water, producing jelly-likestructures. Ex: Gelatin, pectinUsed in:
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Dyes (not dies)C hemicals to give food coloursSynthetic food colours are used to:
Restore food coloursEnhance natural coloursGive colours to colourless food
The synthetic colours used are azo and triphenylcompounds.
Azo compounds contain diazo group, - N = N Triphenyl compounds contain 3 phenyl groups:- C 6 H 5
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Effects of food additives: Alle r gyFood additives such as sodium sulphite, BHA &
BHT, MSG and some food colours can causeallergic reaction.Example: C hinese restaurant syndrome, caused
by MSG,Blue baby syndrome caused by
sodium nitrate, sodium nitrite.
Allergies!!!!Blue baby syndrome (right)
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C ance r
Some food additives can cause cancer.
An example is Sodium Nitrite, a carcinogen.
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B r ain DamageExcessive intake of nitrites can cause brain
damage. Oxygen supply is disrupted. Braindamage is caused. I t is irreversible.
Nitrite I on
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H yp e r activit yTartrazine can cause hyperactivity.
Hyperactive children are very active, and find itdifficult to sleep and are restless.I am hyperactive!!!WAKAKAKAKAKAKAKA!
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Read The FOOD LABEL!
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Advantages of using Food additivesP revent food spoilage
Medical reasons
Nopreservatives
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Disadvantages As I have said, cancer, hyperactivity and allergy.
Dont forget Death.
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Life without food p r ese r vatives
DO YOU WANTTHESE!?
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THANK YOU!Now watch the video.