Emulsifier
Function
Starch complex foaming ability
Modifying ability for oils and fats
Protein modifying ability
Surface active ability
Types of emulsifier
Nonionic
Anionic
Cationic
Amphoteric
How does emulsifier works?
Have both a polar group which is water soluble (hydrophilic parts) and non polar group which is oil soluble (lipophilic parts)
Emulsifier will arranged themselves on the interface between two immiscible liquids and reduced the surface tension.
Hydrophilic part into water and lipophilic part into oil.
Formation of steric or electrical barriers that prevent coalescence of the dispersed droplets.
Emulsion stability system
Interfacial tension
Ionic interaction
Fine particles
Macromolecules
Emulsion destabilization
Creaming
Flocculation
Coalescence
Ostwald ripening
Micelle
Selection of emulsifier
HLB system
Balance between hidrophilic and lipophilic
Higher lipophilicity means lower HLB value, higher hydrophilicity have higher HLB value.
PIT system
Phase inversion temperature system relates the complex, temperature dependent phase behavior of certain emulsifier.
Temperature increase , hydrophobic force become stronger
Definition
Substance which reduce the surface tension at the interface of two immiscible phases, allowing them to mix and foem an emulsion.
Example of food emulsifiers
Glycerine Fatty acid ester (Monoglyceride)
Acetic acid ester of monoglyceride (Acetylated monoglyceride)
Lactyated monoglyceride
Succinylated monoglyceride
DATEM
Sorbitan ester
PG ester
Sucrose ester
CSL
Lecithin
Application
Bread
Dough conditioner-development of less tacky, more extensible dough.
Crumb softener-starch complex retard starch crystallization or retrogradation
Cakes
Stabilize the aerated structure
Promote a finer distribution of the fat droplets
Chocolate
Crystal modifier, inhibit blooming
Ice cream
Aerating agent
Foam stabilizer
Destabilising the product's emulsion
Noodles and pasta
Increase the water absorption
Provide elasticity, and a smooth uniform surface
Margarine and shortening
Promote emulsification
Crystal modification
Creaming ability
Water holding ability
Cocoa powder
provide greater water affinity and aids dispersion
Slow water absorption and reduce clumping
Main topic
Stability of emulsion depends on
Degree of division of the inner phase
Quality or stability of the interfacial film
viscosity of the outer phase
Ratio and specific weight of the volumes of the two phase
Type of emulsion
Oil in water emulsion
Water in oil emulsion
Emulsion
A dispersed two-phase system, an intimate mixture of two liquids that are immiscible under normal conditions
One phase dispersed in the other in the form of fine droplets
Dispersed phase- dispersed droplets
Continuous phase- medium in which droplets are dispersed