Explain the procedure for preserving foods by the use of chemical pres

1.	Explain the procedure for preserving foods by the use of chemical preservatives.
Answer» Use of chemical preservatives: 1. Two important chemical preservatives permitted in different parts of world are Benzoic acid and Sulphur dioxide. The salt of benzoic acid is called sodium benzoate which is used as preservative. Benzoic acid is more effective against yeasts than moulds. 2. Potassium metabisulphite is used as a salt of Sulphur dioxide. Potassium metabisulphite is a crystalline salt and is fairly stable in natural and alkaline medium. Fruits and vegetables which have red colour should be preserved by using sodium benzoate and potassium metabisulphite as a red colour of fruits or vegetable gets discoloured by the use of Sulphur dioxide. 3. Use of chemicals during preservation should be controlled.

Explain the procedure for preserving foods by the use of chemical preservatives.

Answer»

Use of chemical preservatives:

1. Two important chemical preservatives permitted in different parts of world are Benzoic acid and Sulphur dioxide. The salt of benzoic acid is called sodium benzoate which is used as preservative. Benzoic acid is more effective against yeasts than moulds.

2. Potassium metabisulphite is used as a salt of Sulphur dioxide. Potassium metabisulphite is a crystalline salt and is fairly stable in natural and alkaline medium. Fruits and vegetables which have red colour should be preserved by using sodium benzoate and potassium metabisulphite as a red colour of fruits or vegetable gets discoloured by the use of Sulphur dioxide.

3. Use of chemicals during preservation should be controlled.

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