8/11/2019 Emulsion and Foam Introduction

1/14

!

FOOD COLLOIDS:

EMULSIONS &

FOAMSPrepared & Presented by:

Professor Abd Karim Alias

Universiti Sains Malaysia

Abd Karim Alias, 2013 !

#$%&% '%()&*+, %- ./01)/,!2345 678'9)

#$%&%'%()&*+,%-:/00,;1/05678'9)

Emulsion & Foam by Prof. Abd Karim Alias is licensed under aCreative Commons Attribution-NonCommercial-ShareAlike 3.0

Unported License.

8/11/2019 Emulsion and Foam Introduction

2/14

! Food Emulsions: Principles, Practice, and

Techniques --D.J. McClements, CRC

Press, Washington DC, 1999

!

Emulsifiers -- C.E. Stauffer, Eagan Press,

St. Paul, Minnesota, USA, 1999

! Analysis of Food Emulsions -- Chapter 35

in Food Analysis, 2nd edition (S.S.Nielsen, ed.)

References

8/11/2019 Emulsion and Foam Introduction

5/14

4

4

What do mayonnaise, margarine, butter, milk

and coconut milk have in common?

Ans: Emulsion

What do ice cream, meringue, marshmallow,

bread, and cake batter have in common?

Ans:Foam

Emulsion & Foam are dispersed system

Questions:

Abd Karim Alias, 2013

8/11/2019 Emulsion and Foam Introduction

6/14

?

!The term Dispersed System refers to a

system in which one substance (the

dispersed phase) is distributed, in

discrete units, throughout a second

substance (the continuous hhase)

!Each phase can exist in solid, liquid, or

gaseous state

DISPERSED SYSTEM (DISPERSION)

?Abd Karim Alias, 2013

8/11/2019 Emulsion and Foam Introduction

7/14

@

COLLOIDAL DISPERSION (SOL)

dispersions of two or more immiscible

materials, containing structural entities in

the size range 1 nm 1 m.

The simplest type of colloidal system

consists of a single dispersed phaseof

particles in a second continuous phase

called dispersion medium.

TERMINOLOGY

@Abd Karim Alias, 2013

8/11/2019 Emulsion and Foam Introduction

8/14

3

Dispersedphase

Continuousphase

Interface

Abd Karim Alias, 2013

8/11/2019 Emulsion and Foam Introduction

9/14

2

SOLID LIQUID GAS

SOLID Someglasses Sol Smoke

LIQUID Emulsion Aerosol

GAS Solidfoam

Foam

CONTINUOUS PH SE

D

I

S

E

D

P

H

E

TYPES OF DISPERSED SYSTEM

Abd Karim Alias, 2013

8/11/2019 Emulsion and Foam Introduction

10/14

!A

A system containing particles >1 mmwhich are prone to settle under gravityis usually referred to as a suspension.

A dispersion or suspension of liquiddroplets in a liquid continuous phaseis called an emulsion.

A foamis a coarse dispersion of gasbubbles in a liquid (or solid)continuous phase

TERMINOLOGY

Abd Karim Alias, 2013

8/11/2019 Emulsion and Foam Introduction

11/14

!!

Diameter /m

0.1 1 10

Frequency/%

0

5

10

15

20

25

30

35

Emulsion 1

Emulsion 3

Emulsion 5

Polydispersity

Monodisperse

Polydisperse

Abd Karim Alias, 2013

8/11/2019 Emulsion and Foam Introduction

12/14

!