JPH03266961A - Method for bitterness removing treatment of citrus fruit juice - Google Patents

Abstract

PURPOSE:To carry out bitterness removing treatment of a citrus fruit juice containing pulpy substances in an intact state with a synthetic adsorbent by simultaneously settling the pulpy substances and synthetic adsorbent so as to form a separated interface of integrated both. CONSTITUTION:A citrus fruit juice containing pulpy substances is mixed with a normal synthetic adsorbent and both are kept in a suspension state to adsorb bitterness ingredients in the citrus fruit juice in the synthetic adsorbent. The pulpy substances and synthetic adsorbent are then simultaneously settled so as to form a separated interface of integrated both. Thereby, the citrus fruit juice, containing the fine pulpy substances and freed of bitterness is recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for removing bitter-tasting components from citrus fruit juice containing pulp using an adsorbent. In particular, the present invention relates to a method for adsorbing and removing bitter components such that the pulp content does not inhibit the recovery of fruit juice through an adsorbent layer.

<Prior art> Citrus fruit juice is consumed in large quantities, but the juice obtained by squeezing the fruit contains bitter-tasting substances such as flavonoids such as naringin and limonoids such as limonin. Therefore, it is necessary to remove bitterness from the fruit juice to remove these substances.

It is known that these bitter components can be removed using synthetic adsorbents (Fruit Juice Production Bulletin No. 285 (1981L)
(Refer to Japanese Patent Publication No. 60-6619, Japanese Patent Publication No. 60153780)
A bitterness removal treatment method in which fruit juice is passed through a packed bed of synthetic adsorbents is widely used.

<Problem to be solved by the invention> One of the problems with the method of removing bitterness from citrus fruit juice using a synthetic adsorbent is that the pulp content in the fruit juice must be removed in advance6.
This is something that must be done. In other words, the citrus juice obtained by squeezing contains several percent of pulp, and if this liquid is directly passed through a packed bed of synthetic adsorbent, the packed bed will become severely clogged and it will last for a short period of time. It becomes impossible to pass fluid. Therefore, centrifugation and other pretreatments are used to remove the pulp, but either method requires complicated operations. Therefore, a method of removing bitterness by treating citrus fruit juice containing pulp with a synthetic adsorbent is of great value in the fruit juice industry.

<Means for Solving the Problems> According to the present invention, instead of passing citrus juice containing a pulp content through a packed bed of a synthetic adsorbent, a synthetic adsorbent and a citrus juice containing a pulp content are mixed. To easily remove bitterness from citrus juice containing pulp by bringing both into suspension and then simultaneously settling the pulp and synthetic adsorbents so that they form a separation interface where they are integrated. I can do it.

In the present invention, it is important to simultaneously settle the pulp component and the synthetic adsorbent from the suspension, and by doing so, the synthetic adsorbent and large pulp components are integrated into a sedimentary layer with low liquid flow resistance. (-solid layer) is formed. Therefore,
When the fruit juice is extracted from the liquid collection device provided at the bottom of this sedimentation layer, the fruit juice, while containing fine pulp, easily passes through this sedimentation layer, reaches the liquid collection device, and is extracted out of the system.

If the synthetic adsorbent and the pulp component settle separately without forming an integrated separation interface, a part of the sedimentation layer will become a layer consisting only of the pulp component with extremely high liquid passage resistance, and the present invention The benefits are not realized.

The synthetic adsorbent used in the present invention can be appropriately selected from among those conventionally used for the bitterness removal treatment of citrus fruit juices, taking into account its sedimentation properties. Various types of synthetic adsorbents are commercially available, and typical examples include Duolite S-861 and ES-865.
, Amberlight XAD-4, XAD-7 (all products of Rohm and Haas), Diaion [F]HP
20, Sepa beads ■5P207 (all Mitsubishi Kasei ■
products), etc. Therefore, from among these commercially available synthetic adsorbents, one may be selected that has a sedimentation rate comparable to that of the pulp content in the citrus juice to be treated.

The time required to adsorb bitter components in citrus juice varies depending on the type of synthetic adsorbent and the amount used, etc.
Usually it takes about 10 to 60 minutes.

In addition, the amount of synthetic adsorbent applied to citrus fruit juice is basically determined according to the required adsorption capacity, but usually the synthetic adsorbent is used several times without regenerating it each time. Since it is used, the volume ratio is usually about 2 to 20%, preferably about 5 to 15%.

An example of an embodiment of the present invention will be explained in more detail based on the drawings. Fig. 1 shows an example of a stirred tank type device for carrying out the present invention, and (1) shows the main body of the stirred tank, ( 2) is a stirrer;
(3) is a liquid collecting device provided at the bottom of the tank, and (4) is a synthetic adsorbent housed in the tank. First, a predetermined amount of undiluted fruit juice is introduced into the tank via a liquid collection device (3), and is stirred by an agitator (2) to maintain the undiluted fruit juice and synthetic adsorbent in a suspended state for a predetermined period of time to synthesize bitter components. Adsorb to adsorbent. Next, stirring is stopped, and the de-bittered fruit juice is extracted out of the tank through a liquid collecting device (3) having a porous surface that does not allow the synthetic adsorbent to pass through, but allows most of the pulp to pass through. The synthetic adsorbent and pulp fraction settle while forming a separation interface where both are integrated, and a sedimentation layer where the synthetic adsorbent and some pulp components are harmoniously integrated is formed on the liquid collecting device (3). is gradually formed. In addition, in order to promote the discharge of fruit juice and to minimize the amount of remaining fruit juice, it is preferable to introduce compressed air from the washing water introduction pipe (5) and extract the water while pressurizing the inside of the tank.

When the ability of the synthetic adsorbent to remove bitterness decreases, remove the washing water inlet pipe (
Washing water is introduced from 5) to wash the synthetic adsorbent, and a regenerating agent such as an acid solution or an alkaline solution is introduced from the regenerating agent introduction pipe (6) to carry out regeneration treatment and restore the adsorption capacity.

<Examples> Example 1 A synthetic adsorbent, Diaion [F]HP20 (product of Mitsubishi Kasei Corporation) was placed in a cylindrical container with a diameter of 300 mm and a height of 1800 mm, equipped with a liquid collection device at the bottom and equipped with a stirrer. 14I! , and 98ρ of Hassaku fruit juice containing 3 v/v% pulp content. After stirring for 60 minutes to remove bitterness, the juice was extracted through a liquid collecting device at the bottom of the container. The synthetic adsorbent sedimented together with the pulp fraction, and no separate separation interface was formed. In addition, when extracting the fruit juice, compressed air of 1 kg/cm2G was introduced into the container to pressurize the inside of the container.

After removing the bitterness-removed fruit juice, Hassaku Fruit Juice 9842 was poured into the container again and the bitterness-removal treatment was carried out in exactly the same manner as before.

This operation was repeated 5 times to process a total of 490 pV of fruit juice, and the extraction of the fruit juice each time was completed within 15 minutes.

The amount of naringin and limonin in the de-bitter-treated fruit juice was greatly reduced, and the bitterness was hardly felt.

The analytical values of the undiluted fruit juice and the treated fruit juice are shown below.

Comparative Example 1 In Example 1, Diamondion ■H was used as a synthetic adsorbent.
Hassaku fruit juice was treated to remove bitterness in exactly the same manner as in Example 1, except that Sepabead SP2.07 (manufactured by Mitsubishi Kasei Corporation) was used instead of P20. However, since the sedimentation rate of Sepabeads 5P207 was higher than the sedimentation rate of the pulp component, the synthetic adsorbent and the pulp component formed separate separation interfaces and sedimented.

The rate of extraction of fruit juice through the liquid collection device is extremely slow, and the first
In the case of the second treatment, it took about one hour, and in the second treatment, the extraction operation had to be discontinued when about 50 f of fruit juice was extracted.

Comparative Example 2 141% of Diamond Ion HP20 in a cylindrical container with a diameter of 300mm and a height of 1800mm! , to form a packed bed, and add the Hassaku fruit juice used in Example 1 to this.
The solution was passed in a downward flow for hr. But 70! When the fruit juice was passed through the tube, the pressure loss became 3 kg/cm2, and the liquid could no longer be passed through the tube.

Effects> According to the present invention, citrus fruit juice containing pulp can be directly subjected to bitterness removal treatment using a synthetic adsorbent.

Further, according to the present invention, it is possible to obtain a de-bittered fruit juice containing a pulp content that is preferable for taste.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an example of an apparatus suitable for carrying out the invention. 1: Stirring tank, 2: Stirrer, 3: Liquid collection device, 5: Washing water introduction pipe, 6: Regenerant introduction pipe

Claims (2)

[Claims] (1) A step of mixing citrus fruit juice containing pulp and a synthetic adsorbent, keeping both in a suspended state, and adsorbing the bitter components in the fruit juice with the synthetic adsorbent; synthesis from the suspension that has gone through the above steps. A method for removing bitterness from citrus fruit juice, comprising a step of sedimenting an adsorbent and a pulp component while forming a separation interface where they are integrated, and a step of recovering citrus fruit juice with reduced bitterness. (2) Citrus juice containing pulp is supplied to a processing tank equipped with a liquid collection device at the bottom and contains a synthetic adsorbent, mixed with the synthetic adsorbent, and brought into contact with the synthetic adsorbent in a suspended state to produce fruit juice. A process of adsorbing the bitter components in the synthetic adsorbent to a synthetic adsorbent, a process of sedimenting the synthetic adsorbent and pulp from the suspension obtained through the above steps while forming an integrated separation interface between the two, and a process of settling the synthetic adsorbent in a tank. A method for removing bitterness from citrus fruit juice, characterized by repeating a series of steps consisting of a step of retaining the citrus fruit juice in a tank and extracting only the citrus juice with reduced bitterness to the outside of the tank via a liquid collecting device.