JP2010022254A - Method for refining acidic dietary fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy and industrially profitable means for deodorizing dietary fiber. <P>SOLUTION: This deodorizing means comprises treating 100g of commercially available potassium alginate powder, using an atmospheric superheated steam generating apparatus, and a metallic processing chamber (capacity 3L) having an entrance and an exit. It is possible to remove seaweed odor, solvent odor, and cooked odor by leaving potassium alginate at rest in the chamber and bringing atmospheric superheated steam into contact therewith by supplying at a flow rate of 19 kg/h by one pass form. The water content of potassium alginate after treating is 0.8 mass%. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for purifying acidic dietary fiber, an acidic dietary fiber obtained by the method, and a beverage containing the same.

Since dietary fiber has a bowel movement improving action and the like, it is preferable to take a certain amount or more. However, in recent years, the intake of dietary fiber tends to decrease in Japan, and it tends to be insufficient. From this point of view, there is a growing demand for unreasonable intake of dietary fiber that Japanese tend to lack. High molecular weight dietary fiber can be incorporated into foods, and low molecular weight dietary fiber can also be consumed in beverage form.
Of these dietary fibers, acidic dietary fibers such as alginic acid, carrageenan, fucoidan, chondroitin sulfate are water-soluble, and are therefore extremely important because they can be incorporated into both foods and beverages.

However, these dietary fibers generally have a slight unpleasant odor such as a blue odor or kelp odor derived from the plant or seaweed that is the raw material. In general, there is very little solvent odor derived from the manufacturing process. These odors are slight, but in the case of a beverage having almost no taste, since the taste of the beverage is affected, a deodorizing treatment is necessary. A method of contacting with a synthetic adsorbent such as a styrenedivinylbenzene copolymer as a deodorizing means (Patent Document 1) and an activated carbon adsorption purification (Patent Document 2) are complicated, and the manufacturing process is complicated. Such waste is also generated.
JP 2003-144102 A Japanese Patent Laid-Open No. 2-154664

  An object of the present invention is to provide a simple and industrially advantageous means for deodorizing dietary fiber.

  The present inventor examined dietary fiber deodorizing means without using an adsorbent such as a synthetic adsorbent, and used raw acid dietary fiber in the form of salt, which was brought into contact with superheated steam in a certain temperature range. It was found that unpleasant odor can be removed and drying proceeds simultaneously, and the molecular weight of the obtained acidic dietary fiber is hardly changed, and deodorized acidic dietary fiber can be obtained efficiently.

That is, this invention provides the refinement | purification method of acidic dietary fiber which makes 100-160 degreeC superheated steam contact the salt of raw material acidic dietary fiber.
Moreover, this invention provides the acidic dietary fiber obtained by said method, and the drink containing it.

  According to the method of the present invention, deodorized acidic dietary fiber can be efficiently obtained by a simple operation. Further, since it is not necessary to use an adsorbent or the like in the deodorizing step, it is possible to cope with the problem of waste. Since the molecular weight of the obtained dietary fiber hardly changes from that of the raw material dietary fiber, it can be used for the same application as that of the raw material dietary fiber. Further, since drying is performed simultaneously with deodorization, dehydration and drying steps after treatment are unnecessary.

Examples of the raw acid dietary fiber used in the method of the present invention include dietary fibers having a carboxyl group such as alginic acid, carrageenan, and fucoidan, and dietary fibers having a sulfate group such as chondroitin sulfate. Of these, alginic acid is particularly preferred.
As the salt of the acidic dietary fiber, alkali metal salts such as sodium salt, potassium salt and calcium salt, and alkaline earth metal salts are preferable.

These raw acid dietary fiber salts (hereinafter also simply referred to as “dietary fiber”) may be polymers extracted from nature, or previously reduced in molecular weight by means such as hydrolysis. But you can. Examples of the high molecular weight include so-called general high molecular weight dietary fibers extracted and purified from plant raw materials with hot water, acid / alkaline water, and a solvent. Moreover, the dietary fiber which is 1000 mPa * s or less at 20 degreeC when melt | dissolving or disperse | distributing in water and adjusting to 2 mass% and pH 7 from the ease of handling is preferable.
Examples of the dietary fiber having a low molecular weight include those having a weight average molecular weight of 5,000 to 900,000, preferably 10,000 to 500,000, more preferably 10,000 to 100,000, and further preferably 1 to 50,000. By using low molecular weight dietary fiber, it is possible to obtain a beverage with a good throat and a refreshing flavor.

  The salt of the raw acidic dietary fiber used in the method of the present invention may be powdery, gel-like, or slurry-like, but a powdery one is preferred because of its good contact efficiency with superheated steam. The lower the moisture content, the better the contact efficiency with the superheated steam. Therefore, a moisture content of 40% by mass or less is particularly preferred from the viewpoint of shortening the treatment time.

  The temperature of the superheated steam used in the method of the present invention is 100 to 160 ° C, preferably 120 to 150 ° C. If it is in this temperature range, the reduction | decrease and coloring of the molecular weight of acidic dietary fiber will be suppressed, and it can deodorize efficiently.

A sufficient deodorizing effect can be obtained in a short time as the treatment is performed at a high temperature. However, in order not to greatly change the physical properties of the dietary fiber, the change in the average molecular weight with respect to the raw dietary fiber is 10% or less. The conditions are preferably set, and more preferably 5% or less.
That is, although the deodorizing treatment time can be appropriately set depending on the treatment temperature, it is usually preferably 1 to 40 minutes and more preferably 5 to 25 minutes.

  The superheated steam supply amount is preferably 0.5 to 500 kg / h per 1 kg of the raw dietary fiber because the productivity is good and the equipment cost can be reduced. In addition to the one-pass supply, the discharged water vapor may be reheated and circulated.

  The deodorizing treatment of the present invention can be performed under any of a pressurized condition, an atmospheric pressure condition, and a reduced pressure condition. However, if it is below atmospheric pressure (under atmospheric pressure and reduced pressure), a special high-pressure facility is unnecessary, which is desirable. In particular, under atmospheric pressure, in addition to batch processing, continuous processing for discharging low molecular weight dietary fiber while continuously supplying raw materials can be easily performed on an industrial scale. Here, the atmospheric pressure refers to a state where the gauge pressure (atmospheric pressure reference pressure) is 0 MPa.

  In the present invention, the deodorizing apparatus is an apparatus in which superheated steam at 100 to 160 ° C. comes into contact with the dietary fiber, and includes a steam generating device, a heater, a steam introducing device, and a reaction chamber. Any system may be used, for example, an open system or a closed system may be used. For example, a fluidized bed dryer or a tray dryer can be used, but a commercially available superheated steam generator is preferably used.

  Since the deodorizing treatment of the present invention uses superheated steam, drying (dehydration) is also performed at the same time. Therefore, the water content of the acidic dietary fiber obtained after the deodorization / drying treatment of the present invention is preferably 0 to 10% by mass, particularly preferably 0 to 3% by mass.

  The acidic dietary fiber obtained by the method of the present invention has a reduced odor and a low water content. For this reason, it can mix | blend with various foodstuffs or a drink as it is.

  The beverage of the present invention can contain 0.5 to 6% by mass, particularly 1.5 to 5% by mass, of acidic dietary fiber obtained as described above. At low concentrations, lightness over the throat can be provided, and at high concentrations, body feeling (richness) can be provided.

  In addition to the above acidic dietary fiber, vegetable juice and / or fruit juice can be blended with the beverage of the present invention, and it is preferable to use a vegetable juice and / or fruit juice-containing beverage as a form.

  The vegetable juice and / or fruit juice contained in the beverage of the present invention typically comprises vegetable juice as vegetable juice and fruit juice as fruit juice. Vegetables used for vegetable juice include tomatoes, carrots, spinach, cabbage, me cabbage, broccoli, cauliflower, celery, lettuce, parsley, watercress, kale, pumpkin, red bell pepper, bell pepper, radish, etc. As the vegetable juice of the present invention, tomato, carrot, spinach, parsley, celery and cabbage are particularly preferred. Aloe juice can also be used as vegetable juice. These vegetable juices may be used alone or in combination.

  Examples of fruits used for fruit juice include lemons, apples, tangerines, oranges, grapefruits, sweeties, peaches, melons, watermelons, plums, kiwis, guava, prunes, etc., but the fruits of the present invention As the squeezed juice, lemon, apple, tangerine, orange, grapefruit, thigh and the like are particularly preferable. These fruit juices may be used alone or in combination.

  The water content of the beverage of the present invention is preferably 75% by mass or more, more preferably 85% by mass or more, and still more preferably 90% by mass or more. In addition, the measuring method of a moisture content can be measured with the heat drying method of 105 degreeC and 2 hours at a normal pressure, for example.

  The pH of the beverage of the present invention can be adjusted to pH 3.5 to 8 from the viewpoint of storage stability and ease of drinking. The pH is preferably 3.5 to 5, more preferably 3.7 to 4.6, still more preferably 3.8 to 4.5, and particularly preferably 3.9 to 4.3. A pH within the above range is preferable from the viewpoint of storage stability and ease of drinking. Adjustment of pH is normally performed before heat-sterilization in the manufacturing process of the drink of this invention. To adjust pH, in addition to organic acids derived from vegetable juice and fruit juice, additives such as organic acids, organic acid salts, inorganic acids, inorganic acid salts, inorganic salts, and pH adjusters may be used alone or in combination. Can do. At this time, these additives are adjusted by adding appropriate amounts directly or as an aqueous solution diluted to an appropriate concentration. At this time, it may be added while confirming the pH with a pH meter or the like. Examples of these additives include adipic acid, citric acid, gluconic acid, succinic acid, acetic acid, tartaric acid, lactic acid, fumaric acid, malic acid, ascorbic acid, and salts thereof. When the pH changes before and after heat sterilization, the pH before heat sterilization may be adjusted in consideration of the change.

  In addition, the beverage of the present invention is a food additive such as sugar, vitamins, various esters, pigments, antioxidants, fragrances, sweeteners, emulsifiers, preservatives, seasonings, quality stabilizers alone, Or you may mix | blend suitably further together.

(Measuring method of water content of dietary fiber)
The water content of dietary fiber is the amount of change between the weight after drying at 105 ° C. for 2 hours in a dryer (Yamato Scientific ADP300), standing in a desiccator for 30 minutes, and returning to room temperature. Measured from
(Viscosity measurement method)
After adjusting the pH of the measurement sample to 7 with sodium carbonate, the viscosity was measured using a cone rotor type rotational viscometer (RE-85L manufactured by Toki Sangyo Co., Ltd.), a standard rotor (1 ° 34 ′ × R24), The measurement was performed under the condition of a rotational speed of 0.5 to 10 rpm. That is, when the viscosity was 60 mPa · s or more, the rotation speed was appropriately reduced from 10 rpm to 0.5 rpm, and the measurement was performed within the measurement range of the viscometer.
(Average molecular weight measurement method)
The weight average molecular weight was measured by gel permeation chromatography (GPC) method under the following apparatus and conditions.
Column Super AW 4000 and Super AW 2500 (Tosoh Corporation)
Online degasser SD-8022 (Tosoh Corporation)
Dual pump DP-8020 (Tosoh Corporation)
Column oven CO-8020 (Tosoh Corporation)
Differential refractometer RI-8020 (Tosoh Corporation)
Column temperature: 40 ° C
Mobile phase: 0.2 mol / L sodium nitrate Flow rate: 0.6 mL / min
Injection volume: 100L
A calibration curve was prepared using a pullulan standard sample with a known weight average molecular weight.

The flavor was evaluated by adjusting the pH to 7 with sodium carbonate in a 2% aqueous solution.
The color difference was measured using a color difference meter ZE-2000 manufactured by Nippon Denshoku and evaluated by the b value.

Example 1
100 g of commercially available potassium alginate powder (manufactured by Kibun Food Chemifa, Kalarigin K-3, water content 3.4% by mass, purity 96%, 2% by mass, pH 7, viscosity of 20 ° C. aqueous solution 1.52 mPas) was heated at normal pressure. Processing was performed using a steam generator (High Steam 400, manufactured by Shinden Denki) and a metal processing chamber (capacity 3 L) having an inlet and an outlet. Potassium alginate was left in the chamber and contacted by supplying normal pressure superheated steam at a flow rate of 19 kg / h by a one-pass method. Table 1 shows the evaluation before and after the treatment. The water content of the treated potassium alginate was 0.8% by mass.

Example 2
The treatment was performed in the same manner as in Example 1 except that the temperature and time of the superheated steam treatment were changed. Table 1 shows the evaluation before and after the treatment. In addition, the water content of the potassium alginate after a process was 0.5 mass%.

Example 3
10 g of commercially available sodium alginate powder (manufactured by Kibun Food Chemifa, duck argin, water content 2.1% by mass, purity 97%, 2% by mass, pH 7, aqueous solution viscosity 189.3 mPas) under normal pressure superheated steam treatment It processed using the apparatus (Sharp AX-XT3, capacity | capacitance 18L). Sodium alginate was allowed to stand in the chamber, and superheated steam was supplied at a flow rate of about 1 kg / h for contact. Table 1 shows the evaluation before and after the treatment. The water content of the treated sodium alginate was 0.4% by mass.

Comparative Example 1
100 g of potassium alginate used in Example 1 was dried by heating in a dryer (Yamato Scientific ADP300) at 120 ° C. for 30 minutes in the air. Table 1 shows the evaluation before and after the treatment. In addition, the water content of the potassium alginate after a process was 1.5 mass%.

Comparative Example 2
The treatment was performed in the same manner as in Example 1 except that the temperature and time of the superheated steam treatment were changed. Table 1 shows the evaluation before and after the treatment. In addition, the water content of the potassium alginate after a process was 0.2 mass%.

Comparative Example 3
10 g of commercially available alginic acid (manufactured by Kibun Food Chemifa, Duck Acid A, water content 4.0% by mass, purity 95%, 2% by mass, pH 7, aqueous solution viscosity 124.5 mPas) is the same as in Example 3. And normal pressure superheated steam treatment. Table 1 shows the evaluation before and after the treatment. In addition, the water content of the alginic acid after a process was 0.6 mass%.

Flavor evaluation:
5: Strong, 4: Slightly strong, 3: Slightly strong, 2: Slightly weak, 1: Weak In Comparative Example 1, the flavor was insufficient for blending with beverages.
Comparative Example 2 had a heating odor and was colored yellow.
In Comparative Example 3, the average molecular weight was greatly reduced.

Example 4
A drinking water containing 1.0% by weight of potassium alginate obtained in Example 1 was produced. The drinking water had no seaweed odor, solvent odor, and heating odor, and was easy to drink.

Example 5
A tomato beverage was prepared according to the formulation in Table 2. The dietary fiber used was 2.0% by mass of the potassium alginate of Example 1. The beverage using potassium alginate of Example 1 had no seaweed odor, solvent odor, and heating odor, and had a good flavor.

Example 6
A tomato beverage was prepared according to the formulation in Table 2. As a dietary fiber, 2.0% by mass of sodium alginate of Example 3 was used. The beverage using sodium alginate of Example 3 had no seaweed odor, solvent odor, and heating odor, and had a good flavor.

Claims (7)

  The refinement | purification method of acidic dietary fiber which makes 100-160 degreeC superheated steam contact the salt of raw material acidic dietary fiber.   The method for purifying acidic dietary fiber according to claim 1, wherein the contact with superheated steam is carried out under a condition that the average molecular weight change of the acidic dietary fiber is within 10%.   The method for purifying acidic dietary fiber according to claim 1 or 2, wherein superheated steam at atmospheric pressure is used.   The method for refining acidic dietary fiber according to any one of claims 1 to 3, wherein the raw acidic dietary fiber is subjected to superheated steam treatment as a powder, gel or slurry.   The method for purifying acidic dietary fiber according to any one of claims 1 to 4, wherein the salt of the raw acid dietary fiber is sodium alginate or potassium alginate.   The acidic dietary fiber obtained by the method of any one of Claims 1-5.   The drink containing the acidic dietary fiber obtained by the method of any one of Claims 1-5.