substances that reduce the surface tension at the interface of two immiscible phases, allowing them to mix and forms emulsion.
A Coggle Diagram about Application
, Types of Emulsifier
(Cationic – positive electrical charge; e.g., amine compounds. Not used as food additive (toxic);
, Amphoteric – both positive and negative charges, may act as anionic or cationic emulsifier, depending on pH of the system
, Nonionic – uncharged molecules, insensitive to effects of pH and salt content.
and Anionic - negative electrical charge, may be influenced by pH and ionic strength
, HOW DOES IT WORK:!?:
- Emulsifiers reduce surface tension between the two immiscible phases.They have both a polar head (hydrophilic), and a nonpolar group tail (lipohilic)
i. Polar head groups may consists of anionic, cationic, amphoteric, or nonionic functional groups.
- The presence of both regions allows them to orient at the phase interface & lower the interfacial energy that leads to instability.
- Emulsifiers stabilise emulsions by means of monomolecular interfacial films & also by formation of steric and/ or electrical barriers that prevent coalescence of the dispersed droplets
( describe the emulsifying properties of nonionic emulsifiers
, the balance of size and strength of the hydrophilic and lipophilic group on emulsifier.
and HLB of 3 – 6 = a good w/o emulsifier
HLB of 7 – 9 = a good wetting agent, can be used for w/o or o/w emulsifier
HLB of 10 – 18 = a good o/w emulsifier
), Type of emulsion
(Water in oil (W/O)
and Oil in Water (O/W)
) and EMULSION – a dispersed two-phase system, mixture of two liquids that are immiscible under normal conditions, whereby one phase is dispersed in the other in the form of fine droplets.the dispersed droplets = dispersed phase/inner phase
the medium in which the droplets are dispersed = continuous phase