JPH08291201A - Mercerized material of bacterial cellulose - Google Patents

Abstract

PURPOSE: To obtain a mercerized material of a bacterial cellulose having a use for an excellent thickener, etc. CONSTITUTION: This mercerized material of a bacterial cellulose has >=1000cp viscosity of the aqueous suspension of 0.1%, content of a solid material (bacterial cellulose) measured at the angular speed of 10 rad/s at 30 deg.C by using a dynamic liquid viscoelasticity measuring device, >=8000cp viscosity at the angular speed of 1rad/s, >=100cp viscosity at the angular speed of 100rad/s or that of a pseudo plasticity having a yielding point in its flow characteristic, and is produced by performing the mercerization with an ultra high speed homogenizer, a rotatory homogenizer, a high pressure homogenizer or an ultrasonic disintegrator.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a bacterial cellulose disaggregate having uses such as an excellent thickener.

[0002]

2. Description of the Related Art A gel-like cellulosic substance (bacterial cellulose) produced by microorganisms has a microribbon-like form in which individual microfibrils are arranged in parallel and in a plane. By disintegrating this, a highly water-retaining cellulosic disaggregate having excellent dispersibility in an aqueous system can be obtained. Since this is an excellent dispersibility in an aqueous system, the viscosity of foods, cosmetics, paints, etc. is maintained, food material dough Based on the structural and physical characteristics of the cellulosic disaggregated microfibrils, and its industrial value as a low-calorie additive or an emulsion stabilization aid. Polymers, especially water-based polymeric reinforcing materials, have various industrial applications, and sheets obtained from such disaggregated products exhibit a high tensile elastic modulus. It is already known that the solidified substance is expected to have excellent mechanical properties based on the structural characteristics of microfibrils and has applications as various industrial materials (see JP-A-61-113601). See). Also, of course, some methods for producing bacterial cellulose have already been known (see JP-A-62-175190, etc.).

However, the mechanical shearing force of the gel-like cellulosic substance produced by the microorganism disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 61-113601 acts as it is or in the state of adding water or an aqueous solution or a hydrophilic solvent. The disaggregated product of the cellulosic material obtained by the above-mentioned method, in the case of being used for the above-mentioned use, still requires significant improvement in its physical properties.

[0004]

Under the background of the prior art described in the preceding paragraph, the present invention has a significantly improved physical property (viscosity) as compared with the conventionally known disaggregated product of bacterial cellulose, or It is an object of the present invention to develop and provide a bacterial cellulose disaggregate itself exhibiting excellent flow properties and a method for producing such a high quality bacterial cellulose disaggregate.

[0005]

Means for Solving the Problems As a result of intensive research to achieve the object described in the preceding paragraph, the present inventor has found that the above-mentioned high-quality bacterial cellulose disaggregated product can be obtained by disaggregating at a concentration lower than before for a long time. It was found that it can be produced, among them, ultra-high speed homogenizer, rotary homogenizer, high pressure homogenizer, or found to be able to easily produce the high quality bacterial cellulose disaggregate by disaggregating using an ultrasonic crusher, The present invention has been completed based on such findings.

The present invention will be described below in detail.

The present invention is firstly directed to an angular velocity of 10 r at 30 ° C. when an aqueous suspension containing 0.1% solid (bacterial cellulose) is measured by a dynamic liquid viscoelasticity measuring method.
The present invention relates to a disaggregated bacterial cellulose characterized by having a dynamic viscosity at ad / s (hereinafter, also simply referred to as viscosity) of 1000 centipoise or more.

Secondly, the present invention relates to an angular velocity of 1 ra at 30 ° C. when an aqueous suspension containing 0.1% solid (bacterial cellulose) is measured by a dynamic liquid viscoelasticity measuring method.
It relates to a disaggregated bacterial cellulose characterized by having a dynamic viscosity at d / s of 8000 centipoise or more.

Thirdly, the present invention relates to an angular velocity of 100 at 30 ° C. when an aqueous suspension containing 0.1% solid (bacterial cellulose) is measured by a dynamic liquid viscoelasticity measuring method.
The present invention relates to a disaggregated bacterial cellulose characterized by having a dynamic viscosity at rad / s of 100 centipoise or more.

The present invention further provides that the flow characteristics at 30 ° C. when a solid matter (bacterial cellulose) content 0.1% aqueous suspension is measured by a dynamic liquid viscoelasticity measurement method. It relates to a bacterial cellulose disaggregate characterized by being pseudoplastic with a yield value of.

The present invention is also a novel bacterial cellulose according to the present invention, which is produced by subjecting bacterial cellulose to disaggregation treatment with an ultra-high speed homogenizer, a rotary homogenizer, a high-pressure homogenizer, or an ultrasonic crusher. Regarding disaggregated matter.

The present invention further relates to a thickener containing the above-mentioned bacterial cellulose disaggregation as an active ingredient.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION First, an example of a method for producing such disaggregated bacterial cellulose will be described.

The essential point of the production method is that a specific disintegrator is used for disaggregation treatment, gel-like bacterial cellulose produced by microorganisms is added to water or a hydrophilic solvent, and the suspension is in a low concentration. It is subjected to disaggregation treatment for a long time.

This will be described in detail below.

The disaggregated product of bacterial cellulose of the present invention can be produced, for example, by the following method. Bacterial cellulose obtained by culturing a microorganism is separated from the culture solution by a centrifugation method, a filtration method, or the like. The separated bacterial cellulose is washed if necessary. Wash with water or acid, alkali,
It can be carried out with an aqueous solution of a neutral detergent, a surfactant, a bleaching agent and the like.

Then, water, a solvent and the like are added to adjust the disaggregation concentration, and then the suspension is disintegrated by applying a mechanical force. Disaggregation is water, electrolytes such as calcium chloride and sodium chloride in solvents, pigments, inorganic compounds such as activated carbon fine particles, sizing agents, retention aids, fluorescent agents, antifungal agents, antistatic agents,
Alternatively, an organic compound such as latex may be mixed in advance. It should be noted that the disaggregation treatment referred to in the present invention is not limited to an independent secondary operation performed on the bacterial cellulose separated and purified from the culture solution after stirring culture of the microorganism capable of producing cellulose, and is not limited to those skilled in the art. Is self-evident. For example, the disaggregation treatment may be performed while performing the stirring culture.

It is considered that the disaggregation of bacterial cellulose is due to the deformation and destruction of bacterial cellulose due to the stress generated by a mechanical external force. Mechanical external forces include tension, bending, compression, twisting, impact, shearing and the like.

As a device for applying a mechanical external force, there are "Polytron" (KINEMATICA, Switzerland) and "Hiscotron".
(High speed homogenizer such as (Nippon Medical and Riki) Co., Ltd.)
"Excel Homogenizer" (Nippon Seiki Co., Ltd.)
Examples thereof include a rotary homogenizer such as, a high pressure homogenizer such as “Minilab” (Rannie, Denmark), and an ultrasonic crusher such as “SONIFIER” (Branson).

The so-called ultra-high-speed homogenizer according to the present invention is a homogenizer characterized by a structure in which a generator shaft has a notched fixed outer blade and a rotating inner blade capable of ultra-high speed rotation. With this homogenizer, when the inner blade is rotated at high speed, the sample is drawn into the center and ejected violently to the outside from the gap of the outer blade by centrifugal force. It can be homogenized by a synergistic effect with the action of high-frequency pulse energy generated at the same time as the mechanical crushing action.

The rotary homogenizer is a mixer characterized by rotating a blade in a closed container. In disaggregation with such a homogenizer,
The mechanical external force is mainly composed of an impact force caused by the collision between the stirring blade and the bacterial cellulose, and a shear stress generated by the displacement phenomenon due to the speed difference of the medium.

The high-pressure homogenizer means 0 to several thousand bar.
By passing the sample pressurized to the orifice,
It can be homogenized.

The ultrasonic crusher is for crushing with ultrasonic waves generated from a vibrator. For example, as a method of oscillating a vibrator, there is an ultrasonic crusher in which amplified electric energy is directly converted into mechanical vibration by a converter and ultrasonically vibrates the tip of the horn tip. Several other oscillator oscillation methods are known, and there is a method in which electric energy is not directly converted by a converter.
In the disaggregation by such an ultrasonic crusher, the mechanical external force is mainly caused by a significant shear stress locally generated by cavitation (cavity phenomenon) in the medium due to the oscillation of the ultrasonic oscillator.

The disaggregation of bacterial cellulose by such a disaggregation apparatus is carried out in the state of an aqueous suspension of bacterial cellulose. According to the present invention, the concentration of the aqueous suspension has heretofore been known. Low concentration compared to the embodiment,
That is, it is preferable to adjust it to about 0.1%. High concentrations make it very difficult to obtain disaggregates of bacterial cellulose that exhibit the desired viscosity or flow properties.

The disaggregation treatment time is also preferably longer than in the conventionally known mode. The required time can be easily determined as the time required for disaggregation until a desired viscosity is exhibited by conducting a preliminary experiment with an aqueous suspension of bacterial cellulose in the above concentration range in a given case. For example, in the operating condition range of a laboratory scale device, the disaggregation capacity is 10 to 500 m.
It is usually 0.01 to 120 minutes in l. In the case of a high pressure homogenizer, it is advisable to pass through the orifice a plurality of times if necessary.

The bacterial cellulose of the present invention obtained by the disaggregation treatment under the conditions as described above can be placed in a distribution as an aqueous suspension, or can be provided for a desired use, or dried. Then dry matter form (powder)
Needless to say, it can be placed in distribution at.

Incidentally, there are, for example, the following modes of the conventionally known disaggregation processing. Japanese Unexamined Patent Publication No. 62-175190 discloses a disintegration treatment using a British disintegrator at a density of 0.06% and 15,000 rpm, and Japanese Unexamined Patent Publication No. 63-295793 uses an "excel auto-homogenizer". 10 minutes at a concentration of 1% (15,
000 rpm) disaggregation treatment, WO93 / 11182 uses a gourin homogenizer at a concentration of 0.1-1.5% for pulper 90 minutes, Gorlin 1 pass and writing mixer 60 min, Gorlin 3 pass disaggregation treatment, and the applicant's application. Japanese Patent Application No. 5-264830
Use "Polytron" at a concentration of 0.1% for 3 minutes (10,
000 rpm) disaggregation treatment is described. Under these conventional disaggregation treatment conditions, the disaggregated product of the present invention cannot be obtained.

As is well known, bacterial cellulose can be produced by culturing cellulose-producing microorganisms such as Acetobacter, Rhizobium, Abrobacterium, Sphaerotilus, Sultina, Pseudomonas, and Zugrea. Of these microorganisms, bacteria of the genus Acetobacter called acetic acid bacteria are preferable because they produce a large amount of cellulose in a shorter time than bacteria of other genera.

The bacterial cellulose in the present invention is
It can be obtained by static culture, stirring culture, aeration culture, shaking culture, or a combination thereof. For example, JP-A-59
-120159, JP 61-152296, JP 61-2
12295, JP 62-265990, JP 62-175
190, JP 63-202394, JP 62-36467
It can be obtained by the method described in JP-A No. 63-74490, JP-A No. 2-500116, JP-A No. 62-500630. However, bacterial cellulose obtained by stirring culture, aeration culture or shaking culture, and most preferably aeration stirring culture is preferred because of high productivity of bacterial cellulose and easy increase in viscosity by disaggregation.

The present invention also relates to a thickener characterized in that the above-described bacterial cellulose disaggregated product of the present invention is contained as an active ingredient.

Conventionally, it has been generally known that the viscosity of a polymeric thickener such as polyacrylamide or chitansan gum is lowered because the molecular chain is broken by disaggregation. Also, in the case of a fine fibrous cellulose suspension obtained by extremely fibrillating cellulose of plant origin using a high-pressure homogenizer (prepared according to Example 1 of JP-A-59-120638), the above-mentioned book is used. No significant increase in viscosity was observed even when subjected to the disaggregation treatment of the invention, and neither did the excellent flow characteristics of the disaggregated bacterial cellulose of the present invention.

The bacterial cellulose disaggregated product of the present invention is
Since it exhibits remarkably high viscosity or excellent flow characteristics as compared with conventional bacterial cellulose, it can be used as a thickening agent for various applications, by extension, as a dispersing agent, an emulsifying agent, etc. even in a small amount. The use of the bacterial cellulose disaggregate of the present invention is exemplified as follows.

That is, it can be used as a thickener in the fields of foods and cosmetics, and the thickening effect can be obtained by adding a small amount of bacterial cellulose disaggregation to sauces, sauces, juices, mayonnaise and the like. In the cosmetic field, it can be used as a thickener for organic solvents such as glycerin and propylene glycol.

The bacterial cellulose disaggregate of the present invention is
A higher thickening effect can be obtained by mixing with an existing polymer thickener. The existing polymeric thickeners are carrageenan, sodium alginate, pectin, guar gum, curdlan, starch, polydextrose, CMC, xanthan gum, locust bean gum, karaya gum, hydroxypropyl guar, dextran, tragacanth gum, cyclodextrin, pullulan. , Gellan gum, succinoglycan tamarind gum, xyloglucan, gelatin, polyacrylamide,
Polyvinyl alcohol and the like, preferably carboxymethyl cellulose, xanthan gum and the like can be mentioned. These polymeric thickeners can be added after disintegration or before disintegration.

As a dispersant, it can be used as a dispersant for a paper material or a dispersant for a coating color in the papermaking process in the field of paper making, and in the field of foods, it is highly stable in a small amount in instant miso soup, juice, soup and the like. The effect is obtained.

In addition, the disaggregated bacterial cellulose of the present invention is effective as a non-caloric thickener for food in a small amount. An aqueous suspension containing the bacterial cellulose disaggregated product of the present invention is used as a uniformly dispersed beverage or dairy product, in which solid substances are unlikely to settle, and bacterial cellulose which is difficult to use in conventional beverages is used for these applications. It has become possible.

The method of measuring the viscosity in the present invention will be briefly described. That is, using a dynamic liquid viscoelasticity measuring device (for example, FLUIDS SPECTROMETER RFS II manufactured by Rheometrics), Sample 2 having a concentration of 0.1% between parallel discs having a diameter of 5 cm.
Scissor ml, temperature 30 ℃, strain 10%, angular velocity 1-10
The dynamic viscosity was measured when the parallel disk was vibrated while changing the pressure to 0 rad / s.

A little more will be said about pseudoplasticity. That is, the pseudoplastic, when under a certain stress value tau _f without causing flow, caused a shear rate which is proportional to the stress Kos a τ _f (τ-τ _f) the nature of the object causing the flow is there.
By the way, this value τ _f is the yield value. In pseudoplasticity, there are cases where the constant of proportionality between the shear stress and the shear rate decreases with an increase in the shear rate, and a case where it is constant, and the latter case is sometimes called Bingham property. It is well known that both of them can be measured by a dynamic liquid viscoelasticity measuring device.

The pseudoplastic bacterial cellulose disintegration material of the present invention having a predetermined flow characteristic, that is, a yield value, can prevent dripping when used in paints and various spreads.

The aqueous suspension of the disaggregated bacterial cellulose of the present invention has a higher viscosity as the temperature is higher, and is more effective as a thickener.

Further, the aqueous suspension of the disaggregated bacterial cellulose of the present invention has a more remarkable thickening effect in the region of low strain or low angular velocity.

[0042]

The present invention will be further described with reference to the following examples.

Example 1 (Production of bacterial cellulose) Fructose 40 g / L, monopotassium phosphate 1.0 g /
L, magnesium sulfate 0.3 g / L, ammonium sulfate 3 g / L, "Bacto-peptone" 5 g / L, lactic acid 1.4
100 ml of basic medium with a composition of ml / L and initial pH of 5.0
Cellulose-Producing Acetobacter Species BPR2 in a 750 ml Roux Flask
001 (FERM P13466) cryopreserved bacterial suspension 1m
1 was inoculated and statically cultivated in a constant temperature incubator at 28 ° C. for 3 days. After the stationary culture was completed, the Roux flask was shaken well, and the contents were subjected to gauze filtration under aseptic conditions to separate the cellulose pieces and the bacterial cells. 7.5 ml of the obtained bacterial solution
Was inoculated into a 300 ml-volume baffle flask containing 67.5 ml of the above basic medium, and a shake incubator was used to adjust the amplitude to 2
Seed culture was carried out for 3 days while rotating and shaking under conditions of cm, rotation speed 180 rpm, and temperature 28 ° C.

After completion of the culture, the content of the flask was used as a seed bacterial solution and used for the following jar fermenter culture.

A small jar fermenter (total volume of 1000 m) filled with 540 ml of a medium for culturing a jar fermenter to be described later, which has been sterilized with 60 ml of the above seed bacterial solution.
l) aseptically inoculate and keep at pH 1N for 25 hours at 30 ° C.
While controlling to 5.0 with NaOH and 1N H2SO4, the stirring speed was initially 400 rpm.
Then, the culture was performed by a jar fermenter while automatically controlling the rotation speed so that the dissolved oxygen amount (DO) was within 3.0 to 21.0%.

For the jar fermenter culture, the following first
The medium having the composition shown in the table was used.

[0047]

[Table 1]

After completion of the culture, the solid matter in the jar fermenter was collected and washed with water to remove the medium components, and then 1% N
The cells were removed by immersion treatment in an aOH aqueous solution at 110 ° C. for 20 minutes. Further, the produced cellulose was washed with water until the washing liquid became nearly neutral, and then used in experiments such as disaggregation.

Example 2 (Disaggregation of Bacterial Cellulose) Water was added to the washed bacterial cellulose obtained by the jar fermenter culture method obtained by the method of Example 1 to give a disaggregation concentration of 0.1% (dry weight of bacterial cellulose / Capacity). Next, 35 ml of this suspension was subjected to disintegration treatment using the disintegrator shown in Table 2 below under the disaggregation conditions shown in Table 3. Examples 2-1, 2-3 and 2-6 are examples of the present invention, and Examples 2-2, 2-4, 2-5 and 2-7 are conditions considered to correspond to conventional disaggregation conditions. It is a comparative example disaggregated in.

[0050]

[Table 2]

[0051]

[Table 3]

The viscosity of the disaggregated product was measured as follows. That is, using a dynamic liquid viscoelasticity measuring device “FLUIDS SPECTROMETER RFS II” manufactured by Rheometrics, a diameter of 5
2 ml of a disaggregated bacterial cellulose having a concentration of 0.1% was sandwiched between parallel rotating discs of cm, and the viscosity at an angular velocity of 10 rad / s was measured at a temperature of 30 ° C. and a strain of 10%.

The measurement results are shown in Table 4 below.

[0054]

[Table 4]

Example 3 The bacterial cellulose disaggregated product obtained in Example 2-3 was concentrated to obtain a concentrated liquid of the bacterial cellulose dissociated product, and its viscosity was measured at a temperature of 30 ° C., strain of 10% and angular velocity of 10 rad / s. . The result is shown in FIG.

As shown in FIG. 1, the bacterial cellulose of the present invention includes cell cream (fine plant cellulose manufactured by Asahi Kasei Corp.) and M.
It became clear that a higher viscosity can be obtained at a lower concentration than FC (fine plant cellulose manufactured by Daicel Chemical Industries, Ltd.).

Example 4 200 ml of the bacterial cellulose having a concentration of 0.1% obtained in Example 1 was used in 1 with Ace Homogenizer AM8.
Disaggregation for 18 minutes at a rotation speed of 8,000 rpm and a concentration of 0.1
% Bacterial cellulose disaggregate was obtained. The viscosity of this disaggregated bacterial cellulose was measured in the same manner as in Example 2 and it was 1040 centipoise.

The temperature of this disaggregated bacterial cellulose having a concentration of 0.1% was changed to 4 to 60 ° C. and viscosity was measured (angular velocity 1
The result of 0 rad / s) is shown in FIG.

From FIG. 2, it was found that the disaggregated bacterial cellulose of the present invention (concentration 0.1%) had higher viscosity as the temperature increased. This indicates that the effect as a thickener is higher at high temperature.

Example 5 The bacterial cellulose disaggregated product having a concentration of 0.1% obtained in Example 4 was subjected to viscosity measurement (temperature: 30 ° C.) while changing the angular velocity.
The results obtained are shown in FIG.

From FIG. 3, the viscosity of the bacterial cellulose disaggregate (concentration 0.1%) of the present invention has a dependency on the angular velocity, and the thickening effect is remarkable in the low angular velocity region. all right.

Example 6 (Comparison of Viscosity with Existing Thickener) The viscosity of a water-soluble polymer used as an existing thickener was compared with that of the bacterial cellulose disaggregated product of the present invention.

As a sample, polyacrylamide "Perc
ol 57 ”(manufactured by Kyowa Sangyo Co., Ltd.), xanthan gum (manufactured by Tokyo Chemical Industry Co., Ltd.), sodium carboxymethyl cellulose (manufactured by Nacalai Tesque, Inc.), starch“ SOLUBLE STARCH ”(DI
FCO LABORATORIES) and the bacterial cellulose disaggregated product of the present invention (dissociated products of Examples 2-1 and 2-6).
Was used.

For the 0.1% aqueous solutions of these samples,
The result of measuring the viscosity in the same manner as in Example 2 is shown in FIG.

From this figure, it is clear that the disaggregated bacterial cellulose of the present invention exhibits a very high viscosity as compared with conventional thickeners.

Example 7 (Comparison of flow characteristics with existing thickener) The flow characteristics of a disintegrated material of bacterial cellulose by the disaggregation method shown in Example 2-1 and a 0.1% aqueous solution of xanthan gum are shown in Example 2. It was measured with the same dynamic liquid viscoelasticity measuring device as. Results are shown in FIG.

The bacterial cellulose disaggregated suspensions of the present invention are Bingham or pseudoplastic with a high viscosity compared to conventional xanthan gum (see Example 6) plus a stress yield value. It became clear.

Example 8 To 100 ml of the 0.1% disaggregated product of Example 2-3, 0.1 of carboxymethyl cellulose (hereinafter, CMC, manufactured by Hanai Chemical Co., Ltd.) was added.
g was dissolved at 35 ° C. with stirring using a magnetic stirrer to prepare a mixed solution in which the concentrations of bacterial cellulose and CMC were each 0.1% (w / v). Comparing the viscosity of this mixed solution with that of bacterial cellulose alone, 14.3 at an angular velocity of 100 rad / s.
% Had increased. The mixing of CMC synergistically increased the viscosity of the disaggregate. The same effect was observed when CMC was mixed before disaggregation.

Example 9 0.5 g of xanthan gum (Echo gum, Dainippon Pharmaceutical Co., Ltd.) was dissolved in 500 ml of the 0.1% disaggregated product of Example 2-3 at room temperature to prepare a mixed solution. The xanthan gum concentration in the mixture was 0.1% (w / v), which was equal to the bacterial cellulose concentration. The viscosity was measured after standing still at room temperature for one day and night. Table 5 shows the results of comparison with the case where xanthan gum was not added. Mixing xanthan gum significantly increased the viscosity of the disaggregate. The same effect was observed when xanthan gum was mixed before disaggregation.

[0070]

[Table 5]

The viscosity values in the table are relative viscosities when the viscosity of the disaggregated product without xanthan gum (bacterial cellulose only) at each angular velocity at the time of measurement is 100%.

[0072]

EFFECTS OF THE INVENTION According to the present invention, a bacterial cellulose disaggregation having excellent uses such as a thickener can be easily provided.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the concentration of the disaggregated bacterial cellulose of the present invention, cell cream, and MFC and viscosity.

FIG. 2 is a graph showing the relationship between temperature and viscosity of the disaggregated bacterial cellulose of the present invention.

FIG. 3 is a graph showing the relationship between the viscosity and the angular velocity of the bacterial cellulose disaggregate, xanthan gum, and polyacrylamide of the present invention.

FIG. 4 is a graph showing the viscosities of the disaggregated bacterial cellulose of the present invention and other thickeners.

FIG. 5 is a graph showing the flow characteristics of the bacterial cellulose disaggregate and xanthan gum of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location // A61K 7/00 A61K 7/00 R A23L 1/04 (72) Inventor Watanabe Otohiko Kanagawa Biopolymer Research Co., Ltd. 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Japan (72) Inventor Yasushi Morinaga 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa Biopolymer Research Co., Ltd.

Claims (7)

[Claims] 1. When a 0.1% solid (bacterial cellulose) content aqueous suspension is measured by a dynamic liquid viscoelasticity measuring method (however, the angular velocity at 30 ° C. is 10 rad / s.
The bacterial cellulose disaggregated product having a dynamic viscosity of 1000 centipoise or more (measured by the method). 2. A dynamic viscosity of a 0.1% solids (bacterial cellulose) content aqueous suspension measured by a dynamic liquid viscoelasticity measurement method (however, measured at an angular velocity of 1 rad / s at 30 ° C.). A disaggregated bacterial cellulose characterized by having a rate of 8,000 centipoise or more. 3. When a 0.1% solid (bacterial cellulose) content aqueous suspension is measured by a dynamic liquid viscoelasticity measuring method (provided that the angular velocity at 30 ° C. is 100 rad /
A bacterial cellulose disaggregated product having a dynamic viscosity of 100 centipoise or more (measured by s). 4. A flow characteristic at 30 ° C. when a solid matter (bacterial cellulose) content 0.1% aqueous suspension is measured by a dynamic liquid viscoelasticity measuring method. A disaggregated bacterial cellulose characterized by having pseudoplasticity. 5. The bacterial cellulose disaggregated product according to any one of claims 1 to 4, which is produced by performing disaggregation treatment with an ultra-high speed homogenizer, a rotary homogenizer, a high-pressure homogenizer, or an ultrasonic crusher. . 6. The disaggregated bacterial cellulose according to claim 1, wherein the bacterial cellulose is produced by agitating and culturing a cellulose-producing acetic acid bacterium. 7. A thickener comprising the disaggregated bacterial cellulose according to any one of claims 1 to 6 as an active ingredient.