Investigating Glue. We expect the result the casein in milk and textured soy protein in soybean milk have comparable sticking strength as starch contained in commercial glue. The significant advantage of the production of our protein glues is that protei

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Project (chemistry)

Group 8

Class 6A

Name: Leung Kai Yeung      (15) Ng Kai Chi      (22)

Title

To recycle the “bad” protein food by reproducing glue

Aim

Have you even thrown some food because it becomes “bad”? Do you think it really waste money? Do you want to make them become useful again? If you do, our experiment will show you how to do and everything about it.

Apparatus:

Heater, measuring cylinder ×2(250ml&50ml),

pH paper,beaker×2(300ml&500ml),glass rod, spoon

Chemical: 

skim milk, vinegar

Abstract

The sticking properties of different proteins in daily food are being investigated in our experiment. Casein in dairy products and textured soy protein (TSP) in soybean products are abstracted out by precipitation in acid. The samples are then neutralized by carbonate and undergo a series of stress tests to compare the strength of our reproduced protein glues with commercial products.

        The basic principle of the sticking properties of protein glues is the ionic attractions and the Van der Walls’ attractive force generated by the protein molecules. Protein molecules are highly folded, resulting in a great contact surface area and exposure of the hydrophobic bonds. When two surfaces of substances like wood or paper are held together by protein, linkages are formed in between the molecules, and the two surfaces are stick together and are difficult to separate.

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We expect the result the casein in milk and textured soy protein in soybean milk have comparable sticking strength as starch contained in commercial glue. The significant advantage of the production of our protein glues is that proteins in expired food can be recycled and reused to make the useful glue. The glue produced is also not toxic or harmful to the environment.

Introduction

1)The history of glue

        The earliest evidence of use of glue can still be observed in the cave paintings made by Neanderthal ancestors in Lascaux, France. ...

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