KR970007933B1 - Proceding process method of agar materials in manufacturing agar - Google Patents

Abstract

The method uses shaken time or quicklime in place of sodium carried out at 30-60 degree C to include th steeping of agar in a hydrate or potassium hydrate to improve yield, viscosity, separation while maintaining the hardness of jelly. The pretreatment of agar is 0.3-1.5% concentration solution of slake lime or quicklime for 2-4 hours.

Description

Pretreatment Method of Agar Aid in Agar Production

1 is a process diagram schematically showing a conventional agar production method.

The present invention relates to a method for producing agar, and more particularly to a method for pretreatment of agar aid (寒 天 原 藻) used as a raw material of agar production.

Agar is made from red algae seaweeds such as herbaceous genus Gelidium, Pterocladia, Gracilaria and Grateloupia. It is usefully used in various fields such as medical research such as cell culture medium.

In particular, when agar is used as food, the content of plant fiber (植物 이상) is more than 80%, and because it contains a large amount of minerals such as Fe and Ca, it is also gaining attention as a food that can prevent the adult disease of today.

Such agar can typically be industrially produced according to the process shown in FIG.

That is, first, mix one or several aids according to the use and product characteristics, and then immerse in water to make the aid flexible, and at the same time, remove lime, algae, shells, earth and other water-soluble impurities attached to the aid. The pretreatment step is followed by a rinse off.

After the pretreatment step, the raw material goes through steaming or boiling water to extract agar quality. Sulfuric acid can be added to facilitate.

After the ripened agar extract is filtered through a filter bath or a filter press, it is cooled and solidified using a coagulation belt or the like to form a radish.

The coagulated radish dehydrates the coagulated radish by defrosting, compressing, or combining these methods after freezing to separate the water contained therein. .

Dehydrated radish is dried and then commercialized as a dry cloth.

Conventionally, in the agar production method as described above, in order to increase the gel strength of the agar was treated with 5-7% sodium hydroxide or potassium hydroxide at a temperature of 70-90 ℃ according to the quality of the aid in the pretreatment step of the self-preparation.

However, in this case, the gel strength of the agar can be increased, but the yield is low, the viscosity is low, and the yield is high when the product is processed. There are various problems such as deterioration of physical properties and concern about deterioration.

Accordingly, an object of the present invention is to provide an improved agar pretreatment method that solves the conventional problems as described above.

According to the present invention, in the method of preparing agar by pretreatment, ripening, coagulation, freezing, melting, dehydrating and drying agar aids, such as wormwood, creeper and thorn radish, the agar aid is prepared at the temperature of 30-60 ° C. in the pretreatment step. A method for pretreatment of agar aid is provided which is immersed in a solution of slaked lime or quicklime at a concentration of about 0.3-1.5% for 2-4 hours.

The present inventors have tested using various drugs to solve the above problems when using sodium hydroxide or potassium hydroxide in the conventional pretreatment method, using slaked lime or quicklime which is much cheaper than sodium hydroxide or potassium hydroxide. In the case of maintaining the jelly strength, while finding excellent in terms of yield, viscosity, and completion rate, the appropriate amount of use and treatment conditions were found to complete the present invention.

In the present invention, when the slaked lime or quicklime is treated at a temperature of 30 ° C. or lower, its use is inferior, and at the temperature of 60 ° C. or higher, no further effect can be obtained.

In addition, when the concentration of calcined lime or quicklime was less than 0.3%, there was no additive effect, and even when used more than 1.5%, it was difficult to expect further effects.

Since the temperature and concentration conditions of the present invention are lower temperature and lower concentration compared with the conventional treatment of 5-7% at 70-90 ° C. when using sodium hydroxide or potassium hydroxide, the processability and cost can be reduced. It is also advantageous in terms of.

Hereinafter, the method of the present invention will be described in more detail according to examples.

Each test on agar in this Example was performed according to the following method.

[Jelly Strength]

Creating a dry cloth (containing 22% moisture) with 1.5g Sol state after boil water placed in a 100cc, the Sol to cool down sufficiently 16-18 hours at room temperature up to add to the cross-sectional area of 1cm ^2, and then made with Gel state for 20 seconds The weight of the weight when the gel shape was not destroyed was taken as the jelly strength.

[Yield Measurement]

The yield of the dry cloth is expressed as the weight of the final production of dry cloth (containing about 22% of water) relative to the amount of aid.

[Viscosity measurement]

1.5 g of dry cloth was added to 100 cc of water, boiled, and then the temperature was reduced to 85 ° C. and measured using a viscosity of the surface of the viscous rod with a type B viscometer.

Example 1

375 g of agar aid containing Korean loaves and Kosi flakes in a weight ratio of 1: 1 was immersed in 1.2% slaked lime solution at 50 ° C for 3 hours, and then immersed in 10ℓ water for 3 hours and washed again with clean water. Rinse six times.

The pretreated agar aid was boiled for 1 hour using steam at 120 ° C. and then sulfuric acid (H ₂ SO ₄ ) was added to adjust the pH to 6 and boiled again for 3 hours to obtain agar extract.

The agar extract was precisely filtered with a filter press using a perlite to remove debris and the like contained in the agar extract.

The resulting agar solution in the Sol state was cooled and solidified using a coagulation belt with blowing at room temperature.

The coagulum was precooled for 8 hours in a refrigerator at -8 ° C and completely frozen at -16 ° C.

The completely frozen coagulum was thawed by contacting with flowing water at 20 ° C., and then decompressed and dehydrated using a hydraulic press to remove residual water, followed by hot air drying at a temperature of 90-100 ° C.

The resulting dry cloth had a water content of 22% and a yield of 25%.

Jelly strength and viscosity were measured for the resulting dry cloth, and the results are shown in Table 1 below.

Example 2

Except that 1.2% quicklime was used instead of slaked lime in Example 1, a dry cloth was prepared by repeating the procedure of Example 1, and the moisture content was 22% and the yield was 25.5%.

Jelly strength and viscosity were measured for the resulting dry cloth, and the results are shown in Table 1 below.

EXAMPLES 3-12

Example 1 was repeated except that the concentrations of hydrated lime and quicklime were changed to 0.3%, 0.5%, 1.5%, 2.0%, and 3.0%, and the jelly strength and viscosity of the resultant are shown in Table 2. .

Comparative Example 1

The procedure of Example 1 was repeated except that 6% NaOH at 80 ° C. was used instead of slaked lime.

Yield 21%.

Jelly strength and viscosity were measured for the resultant and the results are shown in Table 1 below.

Comparative Example 2

The procedure of Example 1 was repeated except that neither slaked lime nor quicklime was used in the pretreatment.

Yield 25.5%.

Jelly strength and viscosity were measured for the resultant and the results are shown in Table 1 below.

TABLE 1

According to Table 1, it can be seen that the dry cloth produced by the method of the present invention (Examples 1 and 2) has a jelly strength much higher than the jelly strength required by the agar and the viscosity is also improved.

On the other hand, in the case of Comparative Example 1 in which sodium hydroxide was used for the pretreatment, the jelly strength was considerably excellent, but the viscosity was also lowered, and the yield was somewhat lower.

On the other hand, in the case of Comparative Example 2, which did not use any chemicals in the pretreatment, it can be seen that both the jelly strength and viscosity are inferior.

TABLE 2

According to Table 2, the use concentration of slaked lime or quicklime that can be used in the method of the present invention seems to be about 0.3-1.5% is most suitable.

Example 13

Example 1, Comparative Example 1 and Comparative Example 2 provided with 1kg of dry cloth at the same process conditions, respectively, but bleached by the addition of sodium chlorite (NaClO ₂ ) at the end of the cooking process, in Comparative Example 1 50 ppm sodium chlorite Was added and the amount of bleach added to bring about the same bleaching effect according to the amount of addition was measured in Example 1 and Comparative Example 2.

As a result, in the case of Example 1, it was 25 ppm, and in the case of Comparative Example 2, it was 95 ppm.

This indicates that the method of the present invention can reduce the amount of bleach used.

Example 14

This embodiment shows the degree of foaming in the cooking process during the confectionery manufacturing process using a dry cloth.

Sugar was added to dry cloths prepared in Example 1, Comparative Examples 1 and 2, respectively, and heated.

In the process of cooking, Comparative Examples 1 and 2 generated large amounts of small bubbles and flowed out of the cooking tank.

On the other hand, in the case of the agar of Example 1, a very small amount of large bubbles did not flow out of the container.

This indicates that the dry cloth produced by the method of the present invention facilitates the cooking process when used in confectionery.

Using the pretreatment method according to the present invention when manufacturing agar as described above, not only improves the jelly strength, yield and viscosity of the manufactured dry cloth, but also reduces the amount of bleach used. There is an advantage to facilitating.

Claims (1)

In the method of preparing agar by pretreatment, ripening, coagulation, dehydration and drying of other agar aids such as wood starfish, horseradish, thorn radish, etc., the concentration of the agar aid in the pretreatment step at a temperature of 30-60 ° C. is about 0.3-1.5%. Pretreatment method of agar aid, characterized in that the immersion treatment for 2-4 hours in hydrated lime or quicklime solution.