JP2510452B2 - Deodorizing method of reconstituted milk - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of contacting reconstituted milk with a synthetic adsorption resin to remove a heating odor, a strange odor, or a powdery odor that is developed in the reconstituted milk.

[0002]

2. Description of the Related Art Background of the Invention Milk products prepared from reconstituted milk prepared by dissolving powdered milk such as skimmed milk powder or whole milk powder in water are not found in dairy products prepared from fresh milk. An odor such as an odor or a heating odor may appear, which may lower the commercial value. Therefore, there is a demand for reduction or elimination of odor.

In the past, attempts have been made to deodorize or mask reconstituted milk in order to remove odors from the reconstituted milk. Examples of methods for deodorizing odors include a method in which reconstituted milk is heated and then vacuum deaerated, and a method in which skim milk powder or the like is dissolved and aged for a certain period of time. However, none of these methods has been established as a technology for solving the problems such as low odor removing effect and re-emergence of odor during storage of products.

Further, as a method for masking odor,
It has been proposed to add a flavor improver for dairy products prepared from skimmed milk powder, etc. (JP-A-55-124471), but until the odor is eliminated and the flavor of reconstituted dairy products is improved. It has not been put to practical use yet.

Further, as a conventional deodorizing method,
There is a method of using activated carbon. When deodorizing is performed with activated carbon, fine powder is mixed in the deodorizing treatment liquid, and it cannot be used as it is for food and drink. If it is used for food and drink, operations such as filtration will be required. Further, in order to economically use an adsorbent such as activated carbon or a synthetic adsorbent, it is necessary to perform a deodorizing operation on the adsorbent to desorb the adsorbed substance and regenerate the adsorbent. However, the regeneration of the activated carbon has a problem that the adsorbed substance is hard to be desorbed and is not regenerated by a simple operation of passing hot water or caustic soda aqueous solution, and it is difficult to reuse.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a method for efficiently removing the odor expressed in reconstituted milk on an industrial scale, which cannot be achieved by the conventional method, and obtaining a reconstituted milk having no odor and having a good flavor. The challenge is to provide.

[0007]

A feature of the present invention is to bring reconstituted milk into contact with a synthetic adsorbent resin to remove odors developed in the reconstituted milk. As a synthetic adsorption resin,
(I) Weakly basic anion exchange resin adjusted to pH 6.0 to 7.2 , (ii) amphoteric ion exchange resin adjusted to pH 6.0 to 7.2, or (iii) non-functional group-type adsorption resin is used. To be When deodorizing the reconstituted milk with such a synthetic adsorption resin, the concentration of the reconstituted milk is preferably 6 to 50%.

The reconstituted milk referred to in the present invention is reconstituted milk obtained by dissolving milk once dried into powdered milk and dissolving it in water or an aqueous solution. For example, skim milk powder, whole milk powder, buttermilk powder, WPC. (Reconstituted milk or skim milk in which whey protein concentrate) or the like is dissolved in skim milk or partially reconstituted skim milk in which skim milk powder or whole skim milk milk is dissolved, or butter or butter oil dissolved in these reconstituted milk is blended. It includes all reconstituted milk for drinking, and further, reconstituted milk in the form of a solution in which the above-mentioned powdered milk is dissolved in an aqueous solution of fruit juice or a stabilizer. These reconstituted milk can easily be deodorized by contacting with the synthetic adsorption resin.

As the synthetic adsorption resin, a weakly basic anion exchange resin, an amphoteric ion exchange resin or a non-functional group type adsorption resin can be used. Examples of the weakly basic anion exchange resin include Duolite. ) A-
561, Amberlite IRA
There are -94S, Amberlite IRA-68, DIAION WA10, DIAION WA30, DOWEX XUS40285 (a synthetic adsorbent having styrene and divinylbenzene as a base), and the like. For example, there is KS30 (manufactured by Hokuetsu Carbon Co., Ltd.), and non-functional group-type adsorption resins include, for example, Duolite S-861, Duolite S-876, Amberlite XAD-4, Diaion SP800, Diaion HP20. , Dowex S-112 and the like. It should be noted that the non-functional group type adsorption referred to in the present invention
The resin does not have an exchange group and the surface has a macroporous structure.
Adsorption of organic compounds with the adsorption resin
It is caused by the adsorption of the water base on the surface of the resin pores.
It is something. As a method of contacting these resins with the reconstituted milk, a method of filling the column with the resin and passing the reconstituted milk or a tank in which the reconstituted milk and the resin are stirred and brought into contact with each other, and the resin is separated after deodorization There are ways to do it. The synthetic adsorbent resin has a high adsorption capacity and also excellent desorption property, and can be easily regenerated by hot water or soft soda, and has high physical strength and can be repeatedly used. Therefore, the odor of the reconstituted milk can be efficiently and industrially advantageously removed, and the reconstituted milk having a good flavor can be produced. Of these synthetic adsorption resins, weakly basic anion exchange resins and amphoteric ion exchange resins having exchange groups are regenerated with hot water or caustic soda ,
It is used after being neutralized to pH 6.0 with mineral acid or the like.

When the reconstituted milk and the resin are brought into contact with each other, the concentration of the reconstituted milk is usually about 6 to 50%, more preferably 8%.
~ 25% is good. The reason why such a range is preferable is 6
This is because if it is less than 50%, the production efficiency is reduced with respect to the proportion of the resin used, while if it is more than 50%, the efficiency at the time of washing the resin is reduced. The temperature of the reconstituted milk is 25 to 50 ° C.
It is better to contact it with resin. Further, the liquid passing rate when the resin is packed in the column and brought into contact with each other is preferably in the range of SV = 2 to 10, and when the tank is a stirring type, the type of resin, the amount of resin or the type of reconstituted milk, the amount of milk Although it varies depending on the conditions, a deodorizing effect can be sufficiently obtained by contacting for about 30 minutes to 2 hours. The restructured milk deodorized in this way can be made into powdered milk again by concentrating and drying.
In addition, the reconstituted milk before deodorization treatment and the reconstituted milk after treatment are components.
And ion balance hardly change, only odor components
Can be removed.

[0011]

EFFECTS OF THE INVENTION According to the method of the present invention, the odor such as heating odor and powdery odor of reconstituted milk can be easily and industrially achieved by the simple operation of bringing the reconstituted milk into contact with the synthetic adsorption resin. It is possible to efficiently remove, and it is possible to produce a reconstituted milk having a good taste and no odor. The reconstituted milk thus obtained can be used as a raw material for drinkable milk, dairy products or other processed foods, and is extremely useful in practice.

An example of the present invention will be described in more detail below, but the present invention is not limited to this example.

Example 1 A column was packed with 1 liter of synthetic adsorption resin Duolite S-861 (Sumitomo Chemical Co., Ltd.) and 1 N N.
It was regenerated with an aOH aqueous solution to obtain a column for removing odor. As the treatment liquid, reconstituted skim milk was used in which skim milk powder was dissolved at a concentration of 8 w / w% and then refrigerated at 5 ° C. overnight. This reconstituted skim milk 1
0 liter was passed through the column at a temperature of 30 ° C. and a supply rate of 5 liter / h to obtain 8 liters of deodorized reconstituted skim milk. With respect to the reconstituted skim milk that had been subjected to this deodorizing treatment, a deodorizing effect was confirmed by a sensory evaluation by a panel of 8 persons. Untreated reconstituted skim milk was used as a control. As a result of the sensory evaluation, all the panelists judged that the treated skim milk had no odor as compared with the control product. The pH of the treatment liquid treated with the non-functional adsorption resin such as S-861 and S-876 hardly changes from the pH before the treatment.

[0013]

Example 2 Synthetic adsorption resin Dowex XUS4028
The column was filled with 1 liter of 5 ( manufactured by DOW), and 1N
After regeneration with an aqueous NaOH solution, the resin was washed with 4 liters of water, and the column effluent was adjusted to pH 6.50 with 1N HCl.
It was neutralized until it became a odor removal column. As the treatment liquid, reconstituted skim milk was used, which was prepared by dissolving skim milk powder in a concentration of 9 w / w% and refrigerating overnight at 5 ° C. This reconstituted skim milk 10
Litter was passed through the column at a temperature of 30 ° C. and a flow rate of 5 L / h to obtain 6 L of deodorized reconstituted skim milk.
The reconstituted skim milk subjected to this deodorizing treatment had no odor and had a good flavor. In order to investigate the component changes due to deodorization treatment,
The components of the reconstituted skim milk before and after the treatment were analyzed. The analysis results are shown in Table 1. As shown in Table 1, the odor was removed from the treated reconstituted milk without any change in the component composition due to the treatment.

[0014]

[Table 1]

The synthetic adsorption resin used in Example 2 was washed with 6 liters of water at a flow rate of 5 liters / hour, and then washed with 1N NaO.
3 liters of the H aqueous solution were passed through, and rinsed with 4 liters of water for regeneration. By this regenerating operation, 7 liters of reclaimed waste liquid was obtained. This regenerated waste liquid was distilled under reduced pressure, the distillate was extracted with dichloromethane, and the aroma component in the regenerated waste liquid was analyzed by gas chromatography. The analysis results are shown in Table 2. From this table, it was found that the component that caused the odor in the reconstituted skim milk was adsorbed by the resin, and that this component was desorbed by passing the aqueous NaOH solution, and the synthetic adsorbed resin was reusable. I understand.

[0016]

[Table 2]

[0017]

Embodiment 3 Synthetic adsorption resin Dowex XUS4028
The column was filled with 1 liter of 5 ( manufactured by DOW), and 1N
After regeneration with an aqueous NaOH solution, the resin was washed with 4 liters of water, and the column effluent was adjusted to pH 6.50 with 1N HCl.
It was neutralized until it became a odor removal column. The processing liquid is skim milk powder 8.95 w / w%, butter oil 3.51.
W / w% was dissolved in hot water at 60 ° C., homogenized and cooled, and then reconstituted milk refrigerated at 5 ° C. overnight was used. 10 liters of this reconstituted milk at a temperature of 30 ° C and a flow rate of 5 liters /
After passing through the column for h, 6 liters of deodorized reconstituted milk was obtained. The reconstituted milk that had been subjected to this deodorizing treatment had no odor and had a good flavor.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuyuki Asai 2-18-22 Shinsayama, Sayama City, Saitama Prefecture 302 (72) Inventor Masanobu Jimmu 3-11-13 Tsurumai, Sakado City, Saitama Prefecture (56) ) References Japanese Patent Publication No. Sho 49-24664 (JP, B2)

Claims (2)

(57) [Claims] 1. Reconstituted milk is (i) pH 6.0-7.2.
Weakly basic anion-exchange resin adjusted to (ii) same pH
Ion-exchange resin adjusted to (3) or (iii)
A method for deodorizing reconstituted milk, which comprises contacting with any of the functional group-type adsorbent resins to deodorize. 2. The deodorizing method according to claim 1, wherein the reconstituted milk has a concentration of 6 to 50%.