8/9/2019 Chemicals for Consumers:Food Preservatives

1/21

8/9/2019 Chemicals for Consumers:Food Preservatives

2/21

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.

8/9/2019 Chemicals for Consumers:Food Preservatives

3/21

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!

8/9/2019 Chemicals for Consumers:Food Preservatives

4/21

Pr ese r vativesC hemicals that are added to food to RETARD

microorganisms growth

P reserving Strawberries using Sugar Yum Yum!

8/9/2019 Chemicals for Consumers:Food Preservatives

5/21

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

8/9/2019 Chemicals for Consumers:Food Preservatives

6/21

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

8/9/2019 Chemicals for Consumers:Food Preservatives

7/21

Flavoring agents

Two Types

ArtificialFlavours

FlavourEnhancers

8/9/2019 Chemicals for Consumers:Food Preservatives

8/21

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

8/9/2019 Chemicals for Consumers:Food Preservatives

9/21

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

8/9/2019 Chemicals for Consumers:Food Preservatives

10/21

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:

8/9/2019 Chemicals for Consumers:Food Preservatives

11/21

Thickening AgentsThickens the liquids in food and prevents

liquefaction.They absorb water, producing jelly-likestructures. Ex: Gelatin, pectinUsed in:

8/9/2019 Chemicals for Consumers:Food Preservatives

12/21

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

8/9/2019 Chemicals for Consumers:Food Preservatives

13/21

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)

8/9/2019 Chemicals for Consumers:Food Preservatives

14/21

C ance r

Some food additives can cause cancer.

An example is Sodium Nitrite, a carcinogen.

8/9/2019 Chemicals for Consumers:Food Preservatives

15/21

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

8/9/2019 Chemicals for Consumers:Food Preservatives

16/21

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!

8/9/2019 Chemicals for Consumers:Food Preservatives

17/21

Read The FOOD LABEL!

8/9/2019 Chemicals for Consumers:Food Preservatives

18/21

Advantages of using Food additivesP revent food spoilage

Medical reasons

Nopreservatives

8/9/2019 Chemicals for Consumers:Food Preservatives

19/21

Disadvantages As I have said, cancer, hyperactivity and allergy.

Dont forget Death.

8/9/2019 Chemicals for Consumers:Food Preservatives

20/21

Life without food p r ese r vatives

DO YOU WANTTHESE!?

8/9/2019 Chemicals for Consumers:Food Preservatives

21/21

THANK YOU!Now watch the video.