256678061 KHSO3 As Preservative

Topics: Food preservation, Preservative, Sulfur dioxide Pages: 17 (1238 words) Published: June 24, 2015
DELHI PUBLIC SCHOOL
DAGAPUR , SILIGURI
(Affiliated to C.B.S.E.)

Session :- 2012-13
Topic :
Study of effect of Potassium bisulphite as a food preservative

Submitted To:Submitted By:
Mr. B.GHOSH
H.O.D. Chemistry 12th Science
Roll no. =

Certificate

This is to certify that s/o Mr. Amar Singh is a bonafide student of class XIIth Science during session 2012-2013. He has completed his project on Study of effect of Potassium bisulphite as a food preservative successfully under my guidance and supervision.

Mr. S.P. DAS Mr. B.GHOSH
(Head of the institution)(H.O.D. Chemistry)

Acknowledgement

Acknowledgement is the most beautiful page in any project’s final pages. More than a formality, this appears to me the best opportunity to express my gratitude. My project can never begin without you, dear GOD. Rather than saying “thank you” to you, you know that I feel like saying ‘I love you’, to you, always. I must say thanks to my parents who provide me sufficient money and help in making of this project. Mr. B.GHOSH, you are real foundation of the project done by me. My project would never have been possible without your guidance. Thank you very much. Special thanks to my principal who gave support to me and library which provides me helpful books related to this project. Next on my thanks lists are my friends, teachers, students who really showered constructive feedbacks and suggestions without which this project would not have been in present form.

—————————

Index

S. No.

Contents

Page no.

1.

Objective

1

2.

Introduction

2

3

Apparatus

4

4

Materials and Chemicals

5

5

Theory & Procedure

6

6

Effect of concentration of sugar

7

7

Effect of concentration of KHSO3

8

8

Effect of Temperature

9

9

Effect of Time

10

Objective:

The objective of this project is to Study of effect of Potassium bisulphite as a food preservative under various conditions Introduction

Growth of microorganisms in a food material can be inhibited by adding certain chemical substances. However the chemical substances should not be harmful to the human beings. Such chemical substances which are added to food materials to prevent their spoilage are known as chemical preservatives. In our country, two chemical preservatives which are permitted for use are: 1. Benzoic acid(or sodium benzoate)

2. Sulphur dioxide(or potassium bisulphite)
Benzoic acid or its sodium salt, sodium benzoate is commonly used for the preservation of food materials. For the preservation of fruits, fruit juices, squashes and jams sodium benzoate is used as preservative because it is soluble in water and hence easily mixes with the food product.

Potassium bisulphite is used for the preservation of colourless food materials such as fruit juices, squashes, apples and raw mango chutney. This is not used for preserving coloured food materials because Sulphur dioxide produced from this chemical is a bleaching powder. Potassium bisulphite on reaction with acid of the juice liberates Sulphur dioxide which is very effective in killing the harmful micro-organisms present in food and thus prevents it from getting spoiled. HSO3–(aq) + H+ (aq)—————> H2O(l) + SO2(g)

The advantage of this method is that no harmful chemical is left in the food. The aim of this project is to study the effect of potassium bisulphite as food preservative. i. At different temperatures.

ii. At different concentrations and
iii. For different intervals of time.

Apparatus

Materials and Chemicals

Theory

Food materials undergo natural changes due to temperature, time and enzymatic action and become unfit for consumption. These changes may be checked by adding...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Food Preservatives Essay
  • Food Preservatives Research Paper
  • Preservatives Essay
  • How Do Food Preservatives Essay
  • The Effect of Ph on a Food Preservative Essay
  • Effect of pH ona food preservative Essay
  • Natural Preservatives Essay
  • Essay about A COMPARISON FOR THE BETTER FOOD PRESERVATIVE

Become a StudyMode Member

Sign Up - It's Free