MXPA96005546A

MXPA96005546A - Hydrolyzed cereals with fruits or honey added

Info

Publication number: MXPA96005546A
Application number: MXPA/A/1996/005546A
Authority: MX
Inventors: Badertscher Ernest
Original assignee: Societe Des Produits Nestle Sa
Priority date: 1995-11-20
Filing date: 1996-11-13
Publication date: 1998-10-23

Abstract

The present invention relates to a product of hydrolyzed cereal containing honey or whole fruit or pieces of fruit, preparing a mixture of cereal flour, and alpha-amylase, and also honey or fruit, the fruit is in or in pieces, passing a stream of the mixture through an assembly so that the mixture is treated consecutively by jets of steam that are injected to wrap the stream of the mixture to first heat the stream to hydrolyze the starch of the cereal flour and so that after the first With steam treatment, the stream of current can be directed to the stream of the mixture in the direction of the current or countercurrent, the subsequent successive jet or jets of steam are directed to the countercurrent hydrolyzed product stream. The apparatus for carrying out the process includes two nozzles having conically shaped ends positioned to form a channel communicating with a steam supply passage of a body in the form of

Description

HYDROLYZED CEREALS WITH ADDED FRUITS OR HONEY DESCRIPTION OF THE INVENTION The object of the present invention is a process for preparing hydrolyzed cereals with added fruit or honey, to an apparatus for carrying out the process and to the cereals hydrolyzed with added fruits or honey obtained by the process. The manufacture of hydrolyzed cereals has been known for a long time. EP 258486 describes in particular a process for preparing hydrolyzed cereals with added fruits, wherein from 20 to 25% of the enzymatically hydrolyzed cereals are first prepared and then mixed with oatmeal, with water and with at least 50% fruit. The mixture is then heated, degassed and subjected to a post-heating step, before being packaged in glass containers which are pasteurized. The dry matter content of fruits is very low. In general in the order of 10 to 15%. This presents the problems in the preparation of hydrolyzed cereals with added fruits, since it increases the duration and cost of drying and, in addition, damages the quality of the product.

Honey usually contains many spores. This has problems during the preparation of cereals hydrolyzed with added honey, because if the honey is added just before the sterilization stage, the increase in the bacterial load through the germination of the spores during the sterilization step is not avoided . The subject of the present invention is to provide a process for preparing hydrolyzed cereals with added fruit or honey, as well as an apparatus for carrying out the process under particularly simple conditions, which make it possible to avoid these problems. For this purpose, in the process for preparing hydrolyzed cereals with fruit or honey added according to the present invention: a mixture comprising a cereal flour, whole fruits and / or fruit pieces and an alpha-amylase is prepared, or a mixture comprising a cereal flour, honey, water and an alpha-amylase, - the mixture is treated by steam injection in several successive stages, in several successive treatment zones, the steam being injected in the form of a jet ring that surrounds the mixture, counter-current to or in the direction of the mixing stream in a first zone, and counter-current in the next zone, with the amount of vapor reducing from stage to stage, the fruits, while avoiding Damage to whole fruits or pieces of fruit by treating the mixture by steam injection in several stages and counter-current. Furthermore, it has been observed, surprisingly, that the method and apparatus effectively make it possible to obtain hydrolyzed cereals with added honey, which are free of bacterial load by directly hydrolysing the cereal flour mixed with the honey and sterilizing the mixture by steam injection, in several stages, counter-current, in fact, during the hydrolysis of the mixture, the spores contained in the honey germination and, during the sterilization, all this load of bacteria is removed. To carry out the process according to the present invention, preferably a mixture having a water content of 40-80% is prepared. In a first preferred embodiment of the process of the present invention, a mixture is prepared comprising, in% by weight of dry matter, 15-45% fruit and 85-55% cereal flour, for example. In a second preferred embodiment of the process of the present invention, a mixture comprising 15-25% honey, 40-50% water and 30-40% cereal flour, for example, can be prepared.

Preferably, a mixture comprising 0.05 to 0.2 g of alpha-amylase is prepared per 100 g of dry matter of cereal flour. Here it can be used especially as alpha-amylase that sold under the name of Dexlo P by Gist-Brocades N.V. , Food Ingredient Division, P.B. 01, NL-260 MA DELFT. The mixture is therefore treated by the injection of steam in several successive stages in several successive treatment zones, the steam being injected in the form of an annular jet enveloping the mixture, countercurrent to or in the direction of the stream of the mixing in a first zone and countercurrent in the following zones. The fact that the steam can be injected into the first treatment zone in the direction of the mixing stream, while in the following zones it can be injected counter-current to the mixture, is to avoid the damage, wherever of fruit pieces and / or relatively fragile whole fruits, for example. Preferably, the mixture is treated with a quantity of steam that is reduced from stage to stage, starting with a temperature of 80-100 ° C, which is favorable to hydrolysis, up to a temperature of 120-150 ° C, which it is necessary for sterilization and for the inactivation of enzymes.

In each step, the steam injection device is connected to the main steam inlet duct by a tubular arm. The opening of the steam injection nozzles is reduced from stage to stage in order to gradually reduce the amount of steam injected towards the first and last stage. In the first preferred embodiment of the process of the present invention, the mixture preferably crosses the successive treatment zones in the form of a cylindrical stream with a diameter greater than the size of the whole fruits and / or pieces of fruit, in order not to Damage entire fruits and / or pieces of fruit. Finally, the mixture can be dried especially by freeze drying, in the case of a mixture comprising a cereal flour and whole fruits and / or pieces of fruit or by spraying, in the case of a mixture comprising a cereal flour , honey and water, for example. In the case of the first preferred embodiment of the present process, the fruits can be selected from the group consisting of raspberries, strawberries and cherries for example. Preferably, in a preferred embodiment of the present process, the pH of the fruits is adjusted to a value between more than 5 and 6.5 by preparing the mixture in the presence of an alkali metal salt, in order to be able to directly hydrolyze the flour of cereal with fruits with alpha-amylase at an optimum pH. For example, trisodium phosphate can be used as the alkali metal salt. Preferably, the mixture comprising a cereal flour and whole fruits and / or pieces of fruit is then acidified to a pH of 3-5 before drying, in order to restore the color of the fruits, which may have lost it due to to the increase in its pH to a value between more than 5 and 6.5 with an alkali metal salt. The mixture can be acidified with, for example, citric acid monohydrate. The apparatus used in accordance with the present invention is described in more detail below with reference to the accompanying drawing, in which: - Figure 1 is a general schematic view of one embodiment of the apparatus; - Figure 2 is a longitudinal cross-sectional view of a steam injection device of the apparatus shown in Figure 1. The embodiment of the apparatus shown in the Figure 1 comprises four steam injection devices (1-4) assembled in series: Each steam injection device comprises a product injection nozzle (11-41) and a product ejection nozzle (12-42).

Each steam injection device has a tubular arm (13-43) connected to the main steam inlet conduit (5) provided with a control valve (6). The first steam injection device is connected to the tank (7) provided with a mixer (8), wherein the mixture is prepared comprising a cereal flour (A) whole fruits or pieces of fruit or honey and water (B) and an alpha-amylase (C). The last steam injection device is connected to the drying device (9). As can be seen in Figure 2, the steam injection device comprises a product injection nozzle (11) and a product ejection nozzle (12) one after the other, in the straight body tube (10) of T shape, as well as a tubular arm (13) allowing steam to enter through the annular orifice (16). The straight tube (10) is provided with an adjustment groove (14) and with a reinforcing groove (15). The upstream end (18) of the product ejection nozzle (12) penetrates the downstream end (17) of the product injection nozzle (11). These two ends delimit a conical steam injection passage (19) between them.

The product according to the present invention is described in greater detail in the following examples, wherein the percentages and parts are given by weight.

Example 1 Using an apparatus such as that shown in the drawing, cereals hydrolyzed with added raspberries were produced. A mixture was prepared in the tank, comprising 72 kg of wheat flour (87% dry matter), 199 kg of fresh raspberries (13% dry matter), 0.1 kg of alpha-amylase Dexlo p and 5 kg of trisodium phosphate. The mixture has a water content of 66% and a pH of 5.7. The mixture thus prepared was treated by steam injection in four stages with the amount of steam being reduced from stage to stage. In the first steam injection device, the temperature is 90 ° C, in order to allow hydrolysis, then in the other 3 steam injection devices the temperature is gradually increased up to 130 ° C, in order to allow sterilizing the mixture without damaging the raspberry pieces.

After sterilization, the mixture is cooled to 65 ° C and the mixture is acidified to a pH of 4 by adding 5 kg of prediluted citric acid monohydrate. Finally, the mixture is dried by freeze drying. A mixture of cereals hydrolyzed with added raspberries is thus obtained, whose composition is as follows: - protein 10.3% - fat 1.4% - carbohydrate 66.7% - fiber 12.3% - ash 6.3% - water content 3% Example 2 Using an apparatus such as that shown in the drawing, cereals hydrolyzed with added black cherries were produced. A mixture is prepared in the tank, comprising 63 kg of wheat flour (87% dry matter), 202 kg of pitted black cherries (19.8% dry matter), 0.1 kg of Dexlo alpha-amylase and 1.4 kg of trisodium phosphate. . The mixture has a water content of 63.7% and a pH of 5.5.

The mixture thus prepared is treated by steam injection in four stages with the amount of steam being reduced from stage to stage. In the first steam injection device, the temperature is 90 ° C, so that hydrolysis is allowed, then in the other 3 steam injection devices the temperature is gradually increased to 130 ° C, in order to allow Sterilization of the mixture without damaging the cherry pieces. After sterilization, the mixture is cooled to 65 ° C and the mixture is acidified to a pH of 4.2 by adding 1.7 kg of citric acid monohydrate prediluted thereto. Finally, the mixture is dried by freeze drying. Hydrolyzed cereals are obtained with black cherries, whose composition is as follows: protein 7.9% fat 0.9% carbohydrate 79.8% fiber 5.6% ash 2.7% - water content 3% Example 3 Using the apparatus as depicted in the drawing, hydrolyzed cereals with added honey were prepared.

So far, a mixture comprising 72.8 kg of flour, 43.1 kg of Mexican honey, 10.4 kg of water and 0.1 kg of alpha-amylase is prepared in the tank. The mixture has a water content of 53.7%. The mixture thus prepared is treated by steam injection in two stages with the amount of steam being reduced between the first and the second stage. In the first steam injection device, the temperature is 93 ° C, in order to allow the enzymatic reaction, then in the second steam injection device the temperature is gradually increased up to 140 ° C, in order to allow the sterilization of the mixture and the inactivation of the enzymes. After sterilization, the mixture is cooled to 65 ° C and after spray drying. In this way you get a mixture of cereals hydrolyzed with added honey, whose composition is as follows: - protein 7.9% - fat 0.8% - carbohydrate 85.8% - fiber 3.0% - ash 0.5% - content of water 2%

Claims

1. A process for preparing hydrolyzed cereals with added fruit or honey, characterized in that: - a mixture is prepared comprising a cereal flour, whole fruits and / or pieces of fruit and an alpha-amylase, or a mixture comprising a cereal flour, honey, water and alpha-amylase, - the mixture is treated by steam injection in several successive stages in several successive treatment zones, the steam being injected in the form of an annular jet that envelops the mixture against the current or in the direction of the mixture stream in a first zone and countercurrent in the following zones, with the amount of vapor being reduced from stage to stage, - then, the mixture is dried.

2. The process according to claim 1, characterized in that a mixture is prepared having a water content of 40-80%.

3. The process according to claim 1, characterized in that a mixture is prepared comprising 0.05-0.2 g of alpha-amylase per 100 g of dry matter of cereal flour.

4. The method according to claim 1, characterized in that the quantity of steam injected is reduced from stage to stage, starting with a temperature of 80-100 ° C up to a temperature of 120-150 ° C.

5. The method according to claim 1, characterized in that the mixture crosses the successive treatment zones in the form of a cylindrical current with a diameter greater than the size of the fruits and / or pieces.

6. The method according to claim 1, characterized in that the fruits are selected from a group comprising raspberries, strawberries, black cherries and cherries.

7. The process according to claim 1, characterized in that the pH of the fruits is adjusted to a value between more than 5 and 6.5 preparing the mixture in the presence of an alkali metal salt.

8. The process according to claim 7, characterized in that the mixture is acidified to a pH of 3-5 before drying.

9. Hydrolyzed cereals with added fruit or honey obtained by the process according to one of the claims 1-8.

10. An apparatus for carrying out the process according to claims 1-8, characterized in that it comprises, assembled in series, at least 2 steam injection devices, each comprising a product injection nozzle and an ejector nozzle product, each having an initially convergent and then divergent internal section, which are placed one after the other in the straight tube of a T-shaped body, characterized in that a downstream end of the injection nozzle has an inner surface conical opening to the downstream end, an upstream end of the ejection nozzle has a conical outlet surface converging towards the upstream end, the upstream end of the expulsion nozzle penetrates to the downstream end of the nozzle injection, and both ends delimit between them a conical steam injection passage that converges and it is opened through an annular outlet orifice in the product injection nozzle and having an annular inlet orifice adjacent to a tubular arm of the T-shaped body.