Process for the preparation of a foamed product and products obtainable by this process
Foamed products based on an aqueous composition comprising an oxidised ferulyated polymer are stable both during storage and after freezing and subsequent storage. A process for preparing these products is provided.
1. Process for the preparation of a frozen confection comprising the steps of:
a) preparing an aqueous mixture of ingredients of the frozen confection and a ferulyolated compound dissolved in water, said ingredients of the frozen confection comprising sweetener, flavor components and optionally protein, fat, thickeners, emulsifiers, preservatives, and color components,
b) incorporating a gas phase in the mixture formed in step a) to form a foam having an overrun of from 30% to 150%,
c) mixing the foam formed in step b) with an oxidant capable of oxidation of the ferulic acid groups in the ferulyolated compound,
d) freezing the resulting foam formed in step c) at a temperature below minus 4° C.,
wherein the ferulyated compound in step a) contains a majority of ferulic acid groups that are not oxidised before the gas phase is incorporated in step b), and wherein in step c) ferulic acid groups are linked by oxidation carried out either simultaneously or after the incorporation of gas in step b).
2. Process according to claim 1 wherein the gas phase is incorporated by a method selected from the group consisting of subjecting the mixture to high shear treatment, addition of a leavening system under conditions where leavening takes place, and addition of an enzymatic system which leads to gas formation.
3. Process according to claim 1 wherein the oxidant is an enzyme or enzymatic system.
4. Process according to claim 1 wherein the ferulic acid groups of the ferulyated compound in step a) are at most 10% oxidized before the gas phase is incorporated in step b).
5. Process according to claim 1 wherein in step c) ferulic acid groups are linked by oxidation carried out after the incorporation of gas in step b).
6. A frozen confection made by the process according to claim 1 comprising a dispersed gas phase in a liquid phase to form a foamed product, said liquid phase comprising water, an oxidized ferulyolated compound, sweetener, flavor components and optionally protein, fat, thickeners, emulsifiers, preservatives, and color components, wherein the foamed product when stored at a temperature of at or below −20° C. for a period of at least 2 hours and subsequently thawed at about 25° C. will maintain a specific volume which is 70% to 100% of its initial specific volume before it was stored at or below −20° C.
7. Frozen confection according to claim 6 wherein the liquid phase comprises water in an amount of at least 20 wt % on total weight of the liquid phase.
8. Frozen confection according to claim 6 which comprises protein in an amount from 0.1 to 20 wt % on total weight of the liquid phase.
9. Frozen confection according to claim 6 which comprises up to 60 wt % oil on total weight of the liquid phase.
10. Frozen confection according to claim 6 having a specific volume of from 0.01 to 0.9 g/ml.
11. Frozen confection according to claim 6 wherein the ferulyolated compound is a pectin.
12. Frozen confection according to claim 11 wherein the ferulyolated compound is sugar beet pectin.