METHOD FOR THE FABRICATION OF A CHEESE FOAM
CLAUDE GIDDEY AND GEORGES DOVÉ
Patented November 18, 1986
The present invention has for its object the preparation of an aerated food
product based on cheese or, more specifically, based on milk products having
been subjected to a ripening treatment similar to which the cheeses are
The product prepared according to the invention possesses a stable and
cohesive foam structure provided by air or gas microbubbles dispersed within the
cheese dough and, for this reason, it will be called hereunder "cheese foam" or
The concept of cheese foam is not new per se. Indeed, French Pat. No.
2,165,202 discloses a cheese foam obtained by adding to processed cheese melted
at 95o-110o C. under an inert atmosphere one or more of the following
ingredients: milk powder, cream, butter, caseine, whey, and beating the mixture
under a gas pressure of 0.5 to 1.5 bar so as to obtain a foam with a foaming
coefficient of 1.2.
The following document Dissertation Abstracts International; Section B, the
Sciences & Engineering 32 (6), 3424 (1971) mentions a cheese beaten in the form
of a foam and the fact that the collapse of this foam under storage decreases
when the emulsion is effected in the presence of N2O and that it contains
emulsifiers and stabilizers such as gum acacia and glucosyl-glucanes.
French Pat. No. 2,133,293 discloses an expanded milk product obtained by
beating milk in the cold and containing rennet so as to obtain a foam of density
0.25 to 0.55. The milk can be condensed milk and it can be innoculated with a
microorganism of the penicillin type so as to obtain cheese.
The cheese foams known in the state of the art have however a texture which
is not very strong and which is not very stable to storage for a long period and
it was desirable to remedy these drawbacks by providing a cheese foam of
stronger consistency, stable under storage and of extended conservation.
The cheese foam obtained according to the invention, although it is soft and
can spread easily, posesses a great stability to storage (more than six months
at room temperature in a closed vessel which is however opened from time to time
to remove samples) in terms of volume, foam density and storage properties. This
foam contains substantially cheese, a certain proportion of water and,
incorporated therein in a perfectly homogeneous way, an air or gas emulsion of
an albumin solution, such emulsion being namely constituted by beaten egg-white.
Its density is of the order of 0.65 to 0.80 g/cm3 . The proportion of
gas/albumin emulsion relative to the cheese is about 0.5 to 2 v/v which
corresponds, if one uses as a starting a solution 10 to 20% by weight of albumin
in water, to the incorporation into the cheese of 1 to 5% by weight of this
solution, the volume of the latter increasing 10 to 20 times under beating.
Roughly, the quantity by weight of albumin incorporated, as the emulsion into
the cheese, does not exceed about 0.2 to 1% of the total which, in terms of food
and flavour, should at first sight lead to negligible effects.
Now, and it is there that an expected interest of the invention resides, the
cheese foam obtained according to the invention posesses a taste and a structure
extremely attractive compared to the starting cheese used to produced it. It is
onctuous, light, of very fine taste and can be easily spread over bread, this
being without the addition of any further fatty material. Besides, it has in
terms of organoleptic properties, very little relationship with reqular
processed cheese, the flavour of which is generally vulgar and ill developed
whereas, in the product of the invention, the natural cheese flavour of the
original cheese is preserved and even further developed. Besides, the texture of
the cheese foam is significantly more attractive by its softness than that of
the usual processed cheeses.
The process to achieve the present cheese foam is summarized in claim 1.
It is particularly important, when the beaten white egg b is incorporated
into the cheese solution a, due to the great difference of densities between
componants a and b, to avoid any exagerated mechanical stress which might modify
the aerated structure of the desired foam, and, for instance, any violent
kneading effort which might lead to a break of the gas/liquid emulsion
constituted by the air or gas bubbles dispersion in the albumin solution. In
order to do that, it is possible, when a small amount of foam is produced
(laboratory experiments), to work manually by means of conventional tools,
wooden or metal spoons, spindle mixer, etc.. In this respect, it will be noted
that document U.S. Pat. No. 3,962,483 teaches the incorporation under heat to
molten cheese of proteins such as caseine and albumin, the object of such
incorporation being to impart to the cheese more resistance to melting. Now, it
was noticed that such incorporation, followed by beating the product which
results therefrom in order to provide a foam, this being as in the teaching of
document FR-A-2,165,202, does not lead to a cheese foam such as that of the
invention. Indeed, under such conditions of prior mixing with molten cheese, the
albumin does not provide per se a foam, this property being inhibited by the
presence of the fatty substances of the cheese; then beating only leads to an
unstable transitory light condition resulting from the incorporation of air into
the mass, this air escaping shortly afterwards.
Regarding now the industrial working of the method of the invention, the
process summarized in claim 5 will be preferably used. In order to implement
this "static mixing process", it is possible to use a tubular device in which
the components to be mixed are circulated, this device comprising, successively,
dividing elements, deflecting elements, some being left-handed and the others
being right-handed, and linearly mixing elements. One example of such a
apparatus is found in the reference Food Engineering 42 (11), 119-20 (1970).
The types of cheese usable in the present invention are extremely many and
include practically all the cheeses susceptible to form cheese aqueous
suspension under heating with or without the incorporation of additional water.
Thus, the following soft dough cheeses are suitable like camembert, brie, etc..,
the blue cheeses like roquefort, gorgonzola, bresse, etc.. and the harder
cheeses such as tilsit, gruyere, comte, appenzeller, etc.. With the cheeses
having a highly peptized dough such as roquefort, the suspension can be obtained
without additional water, the aqueous suspension being obtainable to a desired
consistency by a simple heating of the dough under mechanical agitation. For
other dryer cheeses, addition of water, of the order of 5 to 50% by weight, can
be necessary, the exact amount depending on the kind of cheese, on its degree of
dryness and on the kind of foam to be obtained. The quantities of water possibly
necessary to be added have to be determined from case to case according to the
needs. Generally speaking, the solution is prepared by cutting the cheese (into
pieces or into chips), by mixing it with the water and by heating the mixture
until it dissolves. To improve the melting, it is possible to use melting salts,
for instance phosphates, polyphosphates, acetates, lactates, etc..
It is important to use sufficiently ripened cheeses in order that the
enzymatic action of the innoculated microorganisms has achieved a level of
protein peptization sufficient to ensure solubility in water and to enable the
obtention of a homogeneous aqueous solution. Thus, for industrial needs, it can
be advantageous not to use fully ripened commercial cheeses (indeed, in the
industrial processes, the requirement to have a relatively large quantity of
starting material of rigorously identical properties is important) but to
proceed with milk curds (prepared by usual processes) taken as in bulk, for
instance of several tens or hundreths of kilogrammes. In such case, this mass of
curds in innoculated, before or after its precipitation, with one or several
typical microorganisms selected according to the needs and the kind of cheese
which it is desired to convert into foam (including rennet) and the ripening of
the full mass is effected under well controlled conditions, sheltered from the
air and with periodical mixing. Once the desired degree of ripening is obtained,
it will be possible to use this mass in part or as a whole in the process
according to the invention.
To achieve the gas emulsion in the albumin solution (egg white), it is
possible to use fresh egg-white or powdered egg-white; in general, it is
preferred to use the white in the form of a dried powder for reasons of
commodity and of reproducibility (more accurate weighing). The beating of the
solution into a snow can be effected by all the known usual means including
continuous or discontinuous methods. In place of air, it is possible to use a
non toxic gas, for instance a rare gas, N2, N2O, etc.
The temperature at which the incorporation of the emulsion b to the cheese
solution a is effected has the following importance: it should be sufficiently
high for, on one hand, ensure that the solution of cheese be of the required
fluidity and, on the other hand, enable the albumin to solidify (the
solidification is also, partly, provided by the cheese acidity: pH 5-6) and also
impart to the foam of the invention its remarkably cohesive, although flexible,
structure. If the temperature is too high, that is if it markedly exceeds 70o to
80o C., the "setting" could be too rapid and could lead to some lack of
homogeneity of the product. Conversely, too low a temperature, i.e. markedly
below 40o C., could exagerately delay the "setting" and might result in a more
or less pronounced collapse of the foam.
It is well understood that, in addition to the usual components of the
cheeses which have been already disclosed above, that is to say, in addition to
the milk proteins, the fatty substances, and water, the microorganisms, salt and
other natural additives of cheeses, it is also possible to use additional food
additives such as spices, various seasoning agents, plant extracts and even
other foodstuffs under comminuted form such as ham, meat, vegetables, etc..
It is also possible to incorporate stabilizers such as gelatin, agar,
carrageenane, and other stabilizing polysaccharides.
The following examples illustrate the invention.
The following ingredients were heated under agitation, first to 115o C.
during about 15 min, then to 60o C., so as to achieve a suspension a:
355 g of blue d'Auvergne with 55% of fat, 50 g of water and 7 g of PZO
(melting salt of the Benckiser Knapsack company, Germany). Besides, a emulsion b
was prepared by vigorously beating at room temperature under air a solution of
1.67 g of powdered albumin in 8.33 g of water.
Thereafter the emulsion b was slowly incorporated with a spatula to the
suspension a maintained at 60o C. Any violent move was avoided which might lead
to a break of the emulsion. The mixture was homogenous after about 3 to 5 min of
work and provided a foam of density 0.75 having the following composition by
weight: cheese 83.75%, water 14.15%, albumin 0.4% and melting salt 1.7%.
This foam has a very fine although intensed taste and reminds of a mixture of
blue d'Auvergne and butter. Its consistency is cohesive and soft at the same
time and it can spread into very fine homogeneous layers. Its storage stability
in jars is excellent and exceeds 6 months at room temperature with no particular
There was proceeded as in the previous example starting from 204 g of 90o C.
pasteurized gorgonzola, 30 g of water, 2 g of PZO and 0.6 g of gelatin as
stabilizer. On the other hand, there was also prepared an emulsion of 1.34 g of
albumin in 6.66 g of water and this emulsion was incorporated at 60o C. into the
solution of gorgonzola, which provided a cohesive, flexible foam of excellent
There was proceeded as in the previous examples starting with, on one hand,
3.1 kg of tilsit, one liter of water, 100 g of PZO and 6 g of gelatin and, on
the other hand, 16 g of albumin in 83.3 ml of water and beating into an
These components were mixed together by bringing them, under the form of
streams driven by pumps, into a static mixing tube heated to 60o C. and
comporting a succession of deflecting baffles and mixing elements arranged so as
to, alternatively, put the streams laminarly together, divide them, subject them
to a helical displacement and bring them together again. The number of these
mixing elements was equal or exceeded 12. There was thus obtained, at the output
of the tube, a homogenized mass of tilsit foam which was at the same time
cohesive and flexible and of excellent taste. This foam remained in perfect
condition for more than 6 months at ordinary temperature.
Cheese kinds labelled A to D were heated to 90o C. under kneading until a
fluid and homogeneous mass was obtained using the following ingredients gathered
(by weight) in the Table hereunder.
A: emmenthal; B: camembert; C: fontine; D: roquefort.
Besides, there were prepared albumin solutions in water (also according to
the indications given in the Table hereunder) and these solutions were converted
by vigorous beating in the presence of air into snowy emulsions (densities of
the order of 0.03 to 0.1).
Thereafter, the respective albumin foams were incorporated to the creams A to
D around 50o to 60o by using the mixing technique disclosed in Example 1.
|PZO (melting salt)||20||3||12||--|
|AFILACTS (preserving agent)||--||0.01||0.01||--|
|Fondagil M-9 (melting salt)||--||--||--||7.1|
|Fresh cream at 25%||--||--||400||--|
|Albumin at 16%||35||30||36||14.3|
|Cheese foam density||0.75||0.8||0.75||0.7|
There were thus obtained very appetizing cheese foams having a very fine
taste and excellent stability under storage.
1. A method for fabricating a cheese foam from pasteurized or
sterilized cheese, wherein the foam has an aerated cohesive structure of long
storage stability, constituted by the presence of air or gas micro-bubbles
homogeneously dispersed therein, comprising the steps of:
(a) preparing an aqueous solution or suspension of cheese dough which has a
temperature between 40o and 80o C., and a viscosity in said temperature range of
500 to 50000 cP;
(b) preparing an emulsion of air or non-toxic gas at room temperature by
beating the gas into an aqueous 10 to 20% by weight albumin solution so as to
achieve a gas/liquid emulsion of the order of 10/1 to 20/1 v/v; and
(c) adding 0.5 to 2 volumes of the emulsion obtained in (b) to 1 volume of
the aqueous solution of cheese dough prepared in (a), at a temperature between
40o and 8020 C., and imparting thereto laminar non-turbulent movement
such that the components unite progressively together into a homogeneous
mixture, the structure of which stabilizes itself by coagulation of the albumin.
2. Method according to claim 1 wherein the solution or suspension of
cheese dough is obtained by heating cheese until it is liquified, the water of
the solution or suspension being that contained in the cheese.
3. Method according to claim 1, wherein the solution or suspension of
cheese dough is obtained by dispersing cheese in comminuted form into 5 to 50%
of its weight, of water and heating until complete dissolution occurs with
homogeneous suspension formation.
4. Method according to claim 1, wherein the solution or suspension of
cheese dough is obtained from milk curd by first innoculating the curd with at
least one strain of microorganisms and rennet appropriate to convert the curd
ripening the resulting mass under shelter from air and while periodically
then heating the mass after the ripening is complete until it is fully
5. Method according to claim 1, wherein step (c) is carried out by
a first stream (a) of the solution or suspension and a second stream (b) of
placing these two streams side-by-side so that they flow linearly in the same
direction such as to achieve a single flow (ab) with the two adjoining
components a and b juxtaposed;
dividing this flow, approximately transversely to the junction area of the
two components, into two independent streams (ab)1 and (ab)2, each of which
comprises a portion of component (a) and a portion of component (b);
modifying the shape and the orientation of the streams relative to each other
by interposing a helical baffler in the path of the streams and again bringing
the streams together laminarly into a single flow, the modification imposed by
the baffles leading essentially to the contacting of the component b of (ab)1
with component b of (ab)2, and conversely, so to achieve an approximately
tetraphase stream abab = (ab)2 ; and
repeating the splitting, reorienting and juxtapositioning of the streams
until a composite stream, macroscopically homogeneous, abab . . . ab = (ab)n
is obtained, n not being lower than 12.
6. Cheese foam consisting essentially of, by weight, 30 to 50% of
cheese solids, 1 to 4% of a salt, 0.2 to 5% of egg albumin, the balance being
water and optionally seasoning agents or other comminuted foodstuff, said foam
comprising a cheese dough having a homogeneous dispersion of air or gas
microbubbles in the cheese dough, said foam further having a density of 0.65 to
0.80, and a taste which is essentially the same as that of the source of the
cheese solids used for its manufacture but with a finer and softer quality.