Food ingredients - Hawkins Watts Limited - NZ

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Hawkins Watts Limited,
43 Maurice Road,
PO Box 12-347, Penrose,
Auckland 1642,
NEW ZEALAND.

T: +64 9 622 2720
F: +64 9 622 2725
E: sales@hawkinswatts.com

Hydrocolloids:
Stabilisers, Thickeners and Gelling Agents > HPMC (HYDROXY PROPYL METHYL CELLULOSE)

HPMC (HYDROXY PROPYL METHYL CELLULOSE)

Application
Hydroxypropyl methylcellulose (HPMC) has very similar properties to methylcellulose, although a smaller range of viscosity types is available. The gel point is higher for HPMC (between 60-70°).

APPLICATION	FUNCTION	WALOCEL PRODUCT
Deep fat fried foods	Improved batter adhesion, reduced oil absorption, Thickender	HM 4000 PA
Redused fat dresssings	Higher hot viscosity, Fat replacement and emulsification	HM 4000 PA
Soups and sauces	Heat stability, Improved creaminess and reduced phase separation.	HM 4000 PA
Edible films and coatings	Reduced frying oil pick up, High elasticity, and reduced crystallisation in sugar coatings.	HM 15
Extrusions and baked goods	Shelf life extension, Increase plasticity, Improved freeze-thaw stability.	HM 4000 PA
Bake-stable fillings	Boil-out control, Control of depositing viscosity, emulsification.	HM 4000 PA
Whipped toppings and Mousses	Foam stabilisation. Syneresis prevention. Viscosity control. Protein replacement.	HM %)

Chemistry
Hydroxypropyl methylcellulose (HPMC) (E464) is a methylcellulose modified with a small amount of propylene glycol ether groups attached to the anhydroglucose units on the cellulose backbone. HPMC is characterised by its monomeric chain length, degree of substitution and content of methoxy and hydroxypropoxy groups on the monomeric unit. Methoxy group content is normally 22-30%, whereas the dydroxy group content is around 6-10%.

Properties

Ion activity	non-ionic
Surface activity	high
Solubility	soluble in cold water, but insoluble in hot
Water retention	very good
Effect of temperature on the solution	viscosity initially decreases with rising temperature, but then increases until a gel is formed; further heating causes flocculation; these processes are reversible
Effect of pH	high solubility in all pH ranges
Effect of monovalent metal ions	high salt concentrations may cause coagulation (reversible)
Effect of polyvalent metal ions	no complexation, therefore no flocculation
Film formation	good to very good film-forming properties

HPMC is ideal for
controlling the rheology of aqueous solutions;
controlling the release of substances in pharmaceuticals;
providing high water retention; and
forming films such as for tablet coatings.

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