ChemistryPresentation(Food Additives) 2003

8/9/2019 ChemistryPresentation(Food Additives) 2003

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FOOD ADDITIVES


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Example and function of type of

food additives

a)Preservative

b)Flavourings

c)Thickeners


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a) Preservative

Function: substance added to food to slowdown and prevent the growth of

microorganisms in order to kept the lasts

longer.

Example: salts, vinegar and sugar have been

used for centuries to preserve food.


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b) flavourings

* Function : to improve the taste of food restore

taste loss due to processing.

* There are 2 types of flavourings :

i) Flavour enchancers

ii) Artificial sweeteners


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i) Flavour enchancers

-Flavor enchancers are chemicals that areadded to food to bring out the flavours to

enhance the tastes of food.

-Exp : monosodium glutamate (MSG)PRESERVATIVES

Sodium nitriteSodium nitrate

-To preserve meat,sausage,cheese and dried fish-To prevent food poisoning in canned food

-To make meat look fresh

Benzoic acid

Sodium benzoate

-To preserve sauces, fruit juice,jam and margarine

Sulphur dioxideSodium sulphite

-To prevent browning in fruit juices-Maintain the freshness of vegetables

-T o prevent the growth of microorganisms


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ii) artificial sweeteners

Aspartame and saccharin

-can be used as a substitute for sugar toenhance the sweetness in food and drink


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c) Thickeners

are chemicals that are added to food to thicken the liquid and toprevent the food from liquefying.

Exp:-Gelatin and pectin are added to help jams and jellies set

- They absorb water and thicken the liquid in food to produce ajelly-like structure.

-They are natural carbohydrates.


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The use of food additives

revent spoilage

Restore the colour of food destroyed during food processing.

Prevent oxidation of fats and oils by oxygen in air

Prevent growth of microorganisms

Improve its appearrance , taste or texture


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The effect of food additives

on health

1.Sodium Nitrate (also called Sodium Nitrite):

Cause blue babysyndrome that is fatal for babiesdue to the lack of oxygen in the blood

2. BHA andBHT:

Cause allergic reactions in some people.


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3. Mono sodium Glutamate (MSG) : It can

cause allergic reaction in some people.


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QUESTIONS

1.Which of the following food additives is used

to stop the activity of microorganisms in food?

A Ascorbic acid

B Benzoic acid

C Citric acid

D Triphenyl compounds

Answer:B


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2.Which of the following food additives is

used to produce jelly-like texture in jams?

A Citric acid

B Pectin

C Sodium nitrate

D Monosodium glutamate

Answer:B


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THANK YOU FOR LISTENING

TO US PATIENTLY


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PRESENTED BY:

GAN HONG PIN

MARTIN CHEN JUN XIANG

CHAN BING ZHE PANG WAI KIAN

CHONG WEN BO

NG LEE KIM


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Documents

ChemistryPresentation(Food Additives) 2003