WO1997048730A1 - Procedes de traitement de cellulose bacterienne - Google Patents
Procedes de traitement de cellulose bacterienne Download PDFInfo
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- WO1997048730A1 WO1997048730A1 PCT/JP1997/001949 JP9701949W WO9748730A1 WO 1997048730 A1 WO1997048730 A1 WO 1997048730A1 JP 9701949 W JP9701949 W JP 9701949W WO 9748730 A1 WO9748730 A1 WO 9748730A1
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- Prior art keywords
- drying
- bacterial cellulose
- cellulose
- dried
- culture
- Prior art date
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/04—Polysaccharides, i.e. compounds containing more than five saccharide radicals attached to each other by glycosidic bonds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/8215—Microorganisms
- Y10S435/822—Microorganisms using bacteria or actinomycetales
- Y10S435/823—Acetobacter
Definitions
- the present invention relates to a method for treating a cellulosic substance (hereinafter, referred to as "bacterial cellulose” or “BC”) which can be produced by culturing a cellulose-producing bacterium, and to the bacterial cellulose obtained as a result. is there.
- bacterial cellulose a cellulosic substance
- BC cellulosic substance
- the present invention relates to a soybean retention agent comprising a disintegrated product of bacterial cellulose thus obtained, and a high-strength sheet containing the disintegrated product.
- BC Bacterial Cellulose
- BC Bacterial Cellulose
- BC is characterized in that the cross-sectional width of fibrils (or fine fibers) is about two digits smaller than cellulose produced from wood pulp or the like.
- the dissociated product of BC has various industrial uses as a reinforcing agent for polymers, especially aqueous polymers, based on such structural and physical characteristics of fibrils.
- a material obtained by solidifying such a cellulosic disagglomerated product into a paper or solid form exhibits a high tensile modulus, so it is expected to have excellent mechanical properties based on the structural characteristics of fipril, and can be applied to various industrial materials. There is.
- Such a disintegration product of BC is in the form of an aqueous suspension or dispersion.
- a solvent such as water, which is several times to several hundred times the weight of the cellulose component, increases storage space, storage and transport costs, and preserves microorganisms.
- drying bacterial cellulose loses its various characteristic physical properties. This is mainly due to the following reasons. That is, since the fibrils of bacterial cellulose are very thin, the surface area per volume is correspondingly large. Thus, when the water evaporates when it dries, there is strong cohesion between the fibrils due to hydrogen bonding. Once such a blockage occurs, the hydrogen bonds between fibrils are not easily broken by water molecules even when water is added again. For this reason, it is very difficult to restore the dried bacterial cellulose to its original disintegrated state, which was suspended again in water.
- ⁇ A method is known in which a water suspension is freeze-dried or solvent-substituted so as not to cause a bond derived from hydrogen bond between fiprils during drying.
- freeze drying and solvent displacement drying require enormous energy and complicated processes.
- the present inventors have already added a bacterial cellulose and a third component other than water to an aqueous suspension containing bacterial cellulose and then dehydrated and dried.
- a method for drying bacterial cellulose has been proposed (Japanese Patent Application No. 7-32947472). According to this method, when re-suspended in water in a dry state (with water content of 25% or less%), various properties such as solubility, dispersibility, sedimentation and viscosity of BC are restored. It became possible.
- the present inventors have further studied a new treatment method for solving the above-mentioned problem, and as a result, when drying BC obtained by stirring culture, Without adding the third component, the BC was dehydrated and dried under tension and the obtained BC was disintegrated, thereby finding that the above-mentioned various properties of the BC were restored, thereby completing the present invention. Disclosure of the invention
- the present invention relates to a method for treating B C, wherein B C obtained by dehydrating and drying bacterial cellulose produced by stirring culture under tension is subjected to a disintegration treatment.
- dehydrating and drying BC under tension means a state where tension is applied to BC during the dehydrating and drying operation.
- natural cellulose containing BC consists of a crystalline part and an amorphous part. The crystalline parts are connected to each other via non-crystalline parts. Drying causes the cellulose to shrink.
- tension is applied along with this shrinkage, tensile stress is applied to both the crystalline part and the non-crystalline part. Since the crystal part has a higher elastic modulus than the non-crystal part, the degree of strain with respect to tensile stress is greater in the non-crystal part.
- the bonds of the non-crystalline portions are hydrogen bonds between cellulose molecules or within the molecules, a large degree of distortion means a large distance between the hydrogen bonds. If the distance between hydrogen bonds is large, water molecules can easily enter. Therefore, when water is added again, the hydrogen bond between the fine fibers of the BC with large strain is easily broken, and the hydrogen bond between the water molecule and the BC observed before dehydration and drying is easily formed again. It is considered something.
- the tension at the time of drying can be done by attaching it on a wet BC glass plate or by casting it and then drying it. It can also be done by drying the BC while keeping the sheet shape .
- water evaporates from the upper surface of the suspension, and the shrinkage accompanying the drying occurs selectively only in the thickness direction, and as a result, tension acts on BC.
- bacterial cellulose has
- the structure of B C dried under tension is also distinguished from the B C dried under no tension by the degree of selective plane orientation of crystals.
- the (10) plane among the crystal planes of cellulose is selectively oriented.
- the crystal plane of this (110) plane is largely oriented so as to be parallel to the sheet plane. The degree of this orientation depends on the heights of the peaks derived from the (110) plane and the (110) plane from among the diffraction curves obtained when X-ray diffraction is performed by the reflection method.
- the value of the degree of plane orientation defined as h 1 / h 2 is desirably 2 or more, preferably 3 or more.
- the BC dehydrated and dried under tension according to the method of the present invention is an example.
- it has various forms such as a sheet shape and a film shape.
- the dehydration and drying treatment can be carried out by conventionally known methods such as air drying, hot air drying, and vacuum drying.
- Examples of a drying apparatus that can be used for dehydrating and drying while applying tension to B C include the following. That is, continuous tunnel drying equipment, band drying equipment, vertical drying equipment, vertical turbo drying equipment, multi-stage disk drying equipment, through-air drying equipment, rotary drying equipment, flash drying equipment, spray drying equipment, cylindrical type Drying equipment, drum drying equipment, screw conveyor drying equipment, rotary drying equipment with heating tubes, vibrating rotary drying equipment, etc., batch type box type drying equipment, ventilation drying equipment, vacuum box type drying equipment, and search
- a drying device such as a drying device can be used alone or in combination of two or more.
- a drum dryer may be used to dehydrate and dry BC under industrial tension.
- This drum dryer is a method in which liquid bacterial cellulose adheres to the surface of a drum that is heated and rotated by a medium such as steam in the form of a film, and is evaporated and dried during one rotation of the drum. Of the dried product.
- the BC is dried under tension so as to be dried under conditions that increase the plane orientation.
- Examples of methods for supplying thermal energy to the object to be dried during drying include direct heating, radiant heating, and indirect heating. Of these, infrared heating, microphone mouth-wave heating, and the like are energy-efficient. desirable.
- BC can be dried to a state where it can be restored to the original wet state.
- the “dry” state is not an absolutely dry state in which there is no water contained in the dried product. In other words, this refers to a case where the content is about 25% or less based on the total weight of solids such as BC contained in the dried product. . The appearance of the dried product in such a state is almost dry.
- Solids such as BC often have a function of adsorbing water due to the presence of polar groups such as hydroxyl groups in the molecule, or retain water in the form of crystal water in the case of low molecular weight Due to the effect, even if a dried product that seems to be dried at first glance is obtained by drying using the method and apparatus described above, if it is released into ordinary air, it adsorbs water vapor in the air. To reach equilibrium. When preservation is required, the water activity value of the dried product of the present invention must be less than or equal to a level at which microorganisms cannot grow. A water activity value of at most 0.9 or less, desirably 0.9 or less is required.
- Hydrophilic liquids such as, for example, glycerin, ethylene glycol, dimethyl sulfoxide, dimethylformamide, surfactants, lactate, gluconic acid and delta-gluconolactone and mixtures of one or more thereof; Or, for example, water-soluble substances such as water-soluble small molecules and water-soluble polymers, and hydrophilic solids such as ice-insoluble substances and poorly water-soluble substances can also be contained.
- the addition amount of these third components can be appropriately selected by those skilled in the art depending on the type of the substance and the like, and is usually 2% by weight to 1,000% by weight based on the weight of BC.
- a culture solution of a cellulose-producing bacterium itself or one containing the third component therein can also be used.
- the concentration of bacterial cells in the aqueous dispersion is significantly lower than that in the concentrate, and can be appropriately selected by those skilled in the art.
- % To 30% In the method of the present invention, BC obtained by dehydration and drying is further subjected to defibration treatment.
- the defibration treatment is usually performed in the form of an aqueous suspension or dispersion containing 0.01 to 30% by weight of BC.
- the form obtained by dehydrating and drying BC becomes, for example, a sheet.
- the disaggregation phenomenon of pateria cellulose is considered to be the phenomenon in which the stress generated inside cellulose due to mechanical external force, etc., deforms and destroys it. Therefore, in the present invention, the disaggregation treatment of bacterial cellulose can be performed by applying a mechanical external force to bacterial cellulose. Furthermore, the digestion treatment can be performed by acid and / or hydrolysis, enzymatic hydrolysis and bleaching.
- the mechanical external force referred to herein includes, for example, stress such as tension, bending, compression, torsion, impact, and shearing.
- stress such as tension, bending, compression, torsion, impact, and shearing.
- compression, impact, and shearing stress are mainly used.
- the mechanical external force is mainly the impact force caused by the collision of the stirring blade and the bacterial cellulose, and the shear force generated by the displacement phenomenon due to the speed difference of the medium.
- the mechanical external force is the compressive force caused by bacterial cellulose sandwiched between the external teeth and the internal teeth, the impact force caused by the collision of high-speed rotating teeth with bacterial cellulose, and stationary.
- the shear stress generated in the medium existing in the gap between the external teeth and the internal teeth rotating at high speed is mainly Become.
- the disintegration treatment of the present invention can be performed by any method other than the above-mentioned specific examples as long as a certain load (mechanical external force) can be applied to the bacterial cellulose.
- the present invention also relates to a disintegrated product of bacterial cellulose obtainable by the treatment method of the present invention, and further, a material retention agent comprising the disintegrated material and a high-strength material containing the disintegrated material. It also relates to seats.
- the defatting treatment performed after dehydrating and drying pateria cellulose under tension according to the method of the present invention is appropriately adjusted for the degree of defibration to obtain a BC. It is possible to suppress the degree of restoration of various properties, and to prevent the drop in drainage speed during papermaking in addition to the high strength with a high Young's modulus.
- the high-strength sheet of the present invention can be prepared by a method well known to those skilled in the art.
- various electrolytes, pigments, organic and inorganic compounds, sizing agents, filler retention agents, and fluorescent light Various known additives such as an agent, a fungicide and an antistatic agent can be appropriately contained according to the purpose and the like.
- the BC-producing cellulose-producing bacteria used in the present invention include, for example, Acetobacter xyI inum subsp.
- Acetobacter xy I inum ATCC 236768 Acetobacter xylinum ATCC 236769, Acetobacter xy I inum ATCC 236769, Acetobacter xy I inum 1 0 2 4 5, Aspactor 'Xylinium ATCC 1 4 8 5 1, Axeton ⁇ xilinum ATCC 1 1 1 4 2 and Axel Bak Yuichi-Xilinum ATCC 1 0 8 2 1 etc.
- Acid bacteria of the genus Acetobacter, Agrobacterium I, Rhizopium, Sarsina I, Pseudomonas I, Achromobaku, Alcaligenes, Aerobacter, Azotobacter and Switzerland By A ⁇ well known methods using them NTG (two Torosogua two gin) and the like which are the species mutants are created by mutation treatment.
- the BPR 201 shares were acquired on February 24, 1993, at 1-3-1 Higashi, Tsukuba City, Ibaraki Prefecture, Japan (zip code: 3005). Deposited at the Research Institute of Microorganisms Depositary of the National Institute of Technology (Accession No. FERP — 13 4 6 6) and subsequently entered into the Budapest Treaty on February 7, 1994 regarding the international recognition of deposits in patent proceedings. Has been transferred to a new depositary (accession number FERMBP — 4 5 4 5).
- Chemical mutation treatment methods using a mutagen such as NTG include, for example, Bio Factors, Vol. I. p.297-302 (1988) and ⁇ Gen. Microbiol, Vol. 135, p. 2917-2929 (1989). Therefore, those skilled in the art can obtain the mutant strain used in the present invention based on these known methods.
- the mutant strain used in the present invention can also be obtained by other mutation methods, for example, irradiation with radiation.
- the weight-average degree of polymerization of the styrene conversion is 1. 6 X 1 0 4 or more, preferably 1.
- BPR301A was obtained on June 12, 1995, 1-3 1-3 Higashi, Tsukuba, Ibaraki, Japan No. 3 0 5) Deposited at the Patented Microorganisms Depositary Center, Institute of Biotechnology and Industrial Technology, Ministry of International Trade and Industry of Japan (Accession number FE
- the weight-average polymerization degree of various celluloses such as BC in the present invention is measured as follows using a GP system (Tosoh HLC-820) incorporating RI as a detector.
- THF is also used as the eluent for GPC.
- the flow rate is 0.5 mi / min
- the pressure is 10 to 13 kg f / cm 2
- the sample injection volume is 100 I.
- the column is measured at 35 ° C using TSK gel GMH—HR (S) (7.5 ID x 300 mm x 2) and guard column (HHR (S)) (Tosoh Co .. Ltd.). .
- sucrose, glucose, fructose, mannitol, sorbitol, galactose, maltose, erythrit, glycerin, ethylene glycol, ethanol, etc. Can be used alone or in combination.
- 3 ⁇ 4 flour hydrolyzate, citrus molasses, beet molasses, beet juice, sugarcane juice, fruit juices including citrus fruits, etc. containing these substances Can be used in addition to sucrose.
- an organic or inorganic nitrogen source such as ammonium salts such as ammonium sulfate, ammonium chloride, ammonium phosphate, nitrate, urea, etc., or Bacto_Peptone, Bacto-Soy tor> e
- Nitrogen-containing natural nutrients such as Yeast-Extract and beans may be used.
- organic trace nutrients amino acids, bimin, fatty acids, nucleic acids, 2.7, 9-tricarboxy-1H-pyro ⁇ [2.3, 5] monoquinoline-4.5-dione, sulphite pulp waste liquor, Gunin sulfonic acid or the like may be added.
- auxotrophic mutants that require amino acids for growth, it is necessary to supplement the required nutrients.
- inorganic salts phosphates, magnesium salts, calcium salts, iron salts, manganese salts, cobalt salts, molybdates, red blood salts, chelate metals, and the like are used.
- inositol, phytic acid, and quinoline quinolinone (Japanese Patent Publication No. 5-17818: Mitsuo Takai, Journal of Paper and Paper Technical Association, Vol. 42, No. 3, No. 2 37-244), carboxylic acid or a salt thereof (Japanese Patent Application Laid-Open No. 7-38986), invertase (Japanese Patent Application Laid-Open No. 7-184667), and methinenin (Japanese Patent Application Laid-Open No. Cellulose production promoting factors such as 7-1, 864, 775) can also be added to the medium as appropriate.
- the pH of the culture is controlled to 3 to 7, preferably around 5.
- the cultivation temperature is in the range of 10 to 40 ° C, preferably in the range of 25 to 35.
- the concentration of oxygen supplied to the culture device may be 1 to 100%, preferably 21 to 80%. Those skilled in the art can appropriately select the composition ratio of each component in these media, the inoculation of the cells into the media, and the like, depending on the culture method.
- Bacterial cellulose (agitation BC) produced by agitated culture has various degrees of crystallinity, polymerization degree, etc., compared to bacterial cellulose (stationary BC) produced by ordinary stationary culture. It is known to have a disordered structure. Such a disordered structure is considered to correspond to an amorphous part. As described above, the non-crystalline part has a greater degree of distortion with respect to the tension, and therefore, the agitation BC is more effective in dehydrating and drying under tension J, and the characteristics of the BC are more easily restored. Because it becomes.
- the bacterial cellulose of the present invention can be produced by a well-known aeration and agitation culture method as a culture method for culturing microorganisms.
- the culturing operation includes so-called batch fermentation, fed-batch fermentation, repeated batch fermentation, and continuous fermentation.
- the stirring culture is a culture method in which the culture solution is stirred while mixing, and the structure of the bacterial cellulose is reduced due to the stirring effect received during the stirring culture, for example, the crystallization index is reduced.
- the crystal part changes to increase o
- stirring means for example, an impeller, an air lift fermenter, a pump-driven circulation of a fermentation broth, and a combination of these means can be used.
- a method for producing a cellulosic substance comprising circulating a culture solution containing bacterial cells between a culture device and a separation device described in Japanese Patent Application Laid-Open No. Hei 8-333394 in the name of the present applicant,
- the above-mentioned method characterized in that the cellulosic substance as a product is separated from the cells and the culture solution, and also disclosed in Japanese Patent Application Laid-Open No. H8-333495 in the name of the present applicant.
- a method for producing a cellulosic substance by culturing a cellulose-producing bacterium described in the official gazette comprising extracting a culture solution from a culture system during a culturing period and keeping the volume substantially equal to the amount withdrawn.
- the above-mentioned production method is characterized in that the concentration of the cellulosic substance in the culture solution during the culture is kept low by continuously supplying a new culture solution.
- a stirring tank such as a jar armor and a tank, a flask with a baffle, a slope lofrasco, and an airlift type stirring tank can be used. is not.
- aeration may be carried out simultaneously with the stirring, if necessary.
- oxygen-containing gas such as air and oxygen-free gas such as argon and nitrogen may be aerated. These gases may be used by those skilled in the art according to the conditions of the culture system. Will be selected as appropriate.
- the culture solution can be agitated by the bubbles if an inert gas is ventilated.
- the culture solution can be agitated while supplying the oxygen necessary for the growth of microorganisms by aeration of an oxygen-containing gas.
- Pacteria cellulose obtained by aeration and agitation culture is separated from the culture broth by rapid centrifugation or filtration.
- the bacterial cells produced by the method of the present invention may be recovered as they are, and may be subjected to a treatment for removing impurities other than the cellulosic substance including the bacterial cells contained in the substance.
- the cellulosic substance referred to in the present invention obtained in this manner includes cellulosic substances, substances containing a heteropolysaccharide having cellulose as a main chain, and / 9-11,3, ⁇ -1 and 2, etc. It contains glucan.
- a heteropolysaccharide having cellulose as a main chain
- glucan contains glucan.
- components other than cellulose are hexoses such as mannose, fructose, galactose, xylose, arabinose, rhamnose, and glucuronic acid, pentoses, and organic acids.
- polysaccharides may be a single substance, or two or more kinds of polysaccharides may be mixed by a hydrogen bond or the like.
- FIG. 1 is a view showing an example of an X-ray diffraction curve obtained as a result of performing X-ray diffraction by a reflection method on a dried BC sample.
- the dispersibility of the suspension was compared visually with the disintegrated product before drying.
- the centrifugal sedimentation was measured by placing 10 ml of a 0.2% bacterial cellulose (BC) suspension in a 15 ml tube made of Falcon and placing it in a 300 ml tube. It was expressed as the ratio of the volume of the sedimented portion to the whole after rapid centrifugation at 0 rotation for 15 minutes. The larger the value of the degree of sedimentation, the more difficult it is to sediment, and the more dispersed it is.
- the value of the sedimentation restoration rate (the degree of sedimentation of the solute after drying and condensed water, the degree of sedimentation of the soybean before drying) was used.
- the viscosity in the present invention means the complex at an angular frequency of 10 rad / sec at 30 ° C. when an aqueous suspension having an 80 content of 0.1% is measured by a dynamic liquid viscoelasticity measurement method.
- Absolute value of viscosity (hereinafter simply referred to as viscosity), which is expressed by the following equation.
- a dynamic liquid viscosity measurement device S (using a ⁇ FLUI DS SPECTROMETER RFS II '' manufactured by Rheometrics Co., Ltd.) was used to measure a BC disintegration product with a port degree of 0.1% between parallel rotating disks with a diameter of 5 cm. After adjusting the temperature to 30 ° C with 2 ml of the aqueous suspension, set the strain to 10% in the frequency sweep mode, and set the angular frequency in 10 steps from 1 to 100 rad / s. This is the viscosity measured at an angular frequency of 10 rad / s when the circle ⁇ is vibrated by raising the pressure in the above equation, where the strain is expressed by the following equation.
- R is the radius of the parallel rotating disk (mm)
- H is the thickness of the sample sandwiched between the parallel disks ( ⁇ )
- ⁇ is the amplitude (rad) of the vibration of the parallel disk.
- Cellulose-producing bacteria were grown by a flask culture method.
- the medium having the following composition was used for the stirring culture.
- the solid matter in the jar arm was collected, and after washing with water to remove the medium components, the cells were removed by a single treatment in a 1% Na0H aqueous solution at 80 ° C. Further, after neutralization with sulfuric acid, the resulting cellulose was washed with water until the washing solution became nearly neutral, thereby obtaining purified pateria cellulose.
- the concentration of BC in the above was determined by extracting the solid in a wet state from the culture solution by centrifugation, and then adding the solid in a 0.2 N sodium hydroxide solution of 20 times the solid content.
- the cells were immersed at 1 ° C for 1 hour to remove bacterial cells and medium components other than pacteria cellulose, and then thoroughly washed with water and dried to calculate from the measured dry weight.
- Example 1
- X-ray diffraction was performed using lyophilized BC and spray-dried BC as a sample by pressing them under a pressure of 200 kg / cm2 into tablets, and other sheet BCs as they were. .
- X-ray diffraction was performed at 35 kV, 2 O mA using Geigerflex 200 (Rigaku Corporation). At 20 ° 5 ° ⁇ 40 °. It was performed by the reflection method in the range of.
- the (110) plane (hereinafter, unless otherwise specified, the index of the crystal plane is described according to monoclinic cellulose
- the thickness of the sheet is the average of the values measured at five or more places with a micrometer. Table 6 shows the results. Table 6 Shape of dried sample Centrifugal sedimentation degree (%) Plane orientation degree (1) Sheet (thickness: 40 microns) 264.1 Sheet (thickness: 350 micron) 203.9 fog-dried powder 2 1.5 Lyophilized product 3 8 1.4
- the degree of centrifugal sedimentation of the lyophilized product obtained by resuspension in water and lysing is the same as that of the lysate before drying. At the same level.
- fibrils are bonded to each other, so that even if the dried product is disaggregated, water cannot enter between the fibrils, and the rapid centrifugal sedimentation does not recover.
- the dispersibility also had the same tendency.
- the bond between fibrils is strong, it is clear from the high plane orientation that the BC is dried under tension, so that hydrogen is easily bonded when water enters. The centrifugal sedimentation was restored when the dried material was disintegrated. It is thought that it was done.
- the disaggregated product of stirred BC obtained in Example 1 was dried using a drum dryer (KDS1 manufactured by Kusunoki Kikai Seisakusho) to obtain a dried product.
- the shape of the dried product was a sheet.
- the dried product was disintegrated in the same manner as in Example 2 and the centrifugal sedimentation was examined.As a result, it was found that the centrifugal sedimentation was higher than that of the original disintegrated material as shown in Table 5. .
- Example 2 The disaggregated product of the stirred BC obtained in Example 1 was dried using a drum dryer (KDS1 manufactured by Kusunoki Kikai Seisakusho) to obtain a flake-like dried product. Next, a dry powder was obtained using a dry mill. The dried powder was disintegrated in the same manner as in Example 2. 100 parts of light weight calcium carbonate was added to 100 parts of pulp mixed with LBKP disintegrated in accordance with IS-P-8209 and 5:95 by weight. The filler yield was calculated from the amount of the screen passing material by adding 1 part of the hauling powder and using this papermaking material in accordance with TAPPI standard method T261. The embedding of the filler was carried out at 400 ° C for 8 hours in accordance with the TAPPI standard method T269. The results are shown in Table 7. BC amount (%) Food retention agent (%) Blank (no BC) 1 6 8
- the agitated BC obtained in the Reference Example was mixed with water, and then disintegrated using a homogenizer (Saisei Sterizai) to obtain a disintegrated substance having a concentration of 0.5%.
- the dissolution conditions were 180,000 rpm for 2 minutes and the volume was 250 ml.
- This difficult material is placed in a flat polypropylene bowl with a diameter of 4 cm and a thickness of about 5 mm. Then, the sheet is dried by infrared radiation at 105 ° C. Obtained. The thickness of the sheet should be about 30 microns or less.
- the lysate was freeze-dried under vacuum to obtain a lump sample.
- the undigested material after the drying process (control) and the two disintegrated materials (1) and (2) after the drying process are placed in a flat polystyrene container with a diameter of 4 cm and a thickness of about 5 mm. Then, it was dried at 50 ⁇ using infrared rays to obtain a receipt. After separating the dried sheet from the container, the thickness of each sheet was measured. Next, a rectangular sample having a width of 5 mm and a length of 3 cm was cut out from these sheets, and the Young's modulus was measured by a non-resonant forced vibration method.
- DM S2100 manufactured by Seiko Instruments Inc.
- a vibration of 10 Hz was applied at room temperature, the initial tension was 100 g, the displacement was 10 m, and the sample length was 2 cm.
- the filtration rates of the original disintegrated product not subjected to the drying step (control) and the two disintegrated products (1) and (2) subjected to the drying step were measured.
- 50 ml of a suspension of the disaggregated product prepared at IS to a concentration of 0.2% BC was suction-filtered using a filter paper having a diameter of 47 mm (Adopantech, No. 2).
- the amount of water filtered during the first minute was measured.
- Table 8 shows the results. The apparent specific gravity was calculated from the overlap, thickness, width, and length of the sample.
- an excellent filler retention agent can be obtained by using BC once dried and then defibrated. Furthermore, despite the greatly increased filtration rate of the sheets obtained from such BC, their Young's modulus is lower than that of sheets made from disintegrated material that has not been subjected to a drying step. There was no significant decrease. This result indicates that the use of the defibrated BC after drying according to the method of the present invention is particularly advantageous in terms of water flow rate for producing a high-strength sheet in a papermaking process or the like. .
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97924349A EP0846703A4 (en) | 1996-06-21 | 1997-06-09 | METHODS OF TREATING BACTERIAL CELLULOSIS |
US09/011,478 US6153413A (en) | 1996-06-21 | 1997-06-09 | Method for processing bacterial cellulose |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8/179796 | 1996-06-21 | ||
JP17979696 | 1996-06-21 |
Publications (1)
Publication Number | Publication Date |
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WO1997048730A1 true WO1997048730A1 (fr) | 1997-12-24 |
Family
ID=16072051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/001949 WO1997048730A1 (fr) | 1996-06-21 | 1997-06-09 | Procedes de traitement de cellulose bacterienne |
Country Status (4)
Country | Link |
---|---|
US (1) | US6153413A (ja) |
EP (1) | EP0846703A4 (ja) |
KR (1) | KR19990037728A (ja) |
WO (1) | WO1997048730A1 (ja) |
Cited By (2)
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JP2011202101A (ja) * | 2010-03-26 | 2011-10-13 | Toppan Printing Co Ltd | シートおよびその製造方法 |
JP2020516299A (ja) * | 2017-04-11 | 2020-06-11 | ナノローズ リミテッド | 植物成長培地及びその作製方法 |
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US6986963B2 (en) * | 2001-12-14 | 2006-01-17 | Ut-Battelle Llc | Metallization of bacterial cellulose for electrical and electronic device manufacture |
BR0205047C1 (pt) * | 2002-11-21 | 2003-11-04 | Ronaldo Da Rocha Loures Bueno | Endoprótese revestida com membrana de celulose biossintética |
US20060134758A1 (en) * | 2002-12-05 | 2006-06-22 | Levy Nelson L F | Process for obtaining a ccellulosic wet sheet and a membrane, the equipment used to obtain the membrane and the membrane obtained |
US20080044456A1 (en) * | 2006-08-17 | 2008-02-21 | Wellborn Participacoes Societarias S/C Ltda | Cellulose membrane drying process |
US20100016575A1 (en) * | 2008-07-15 | 2010-01-21 | Zhi-Fa Yang | Bacterial cellulose-containing formulations lacking a carboxymethyl cellulose component |
DE102008046298A1 (de) * | 2008-09-09 | 2010-03-11 | Epc Engineering Consulting Gmbh | Vorrichtung zur Herstellung bakteriell synthetisierter Cellulose oder cellulosehaltigem Flächenmaterial |
CN102439074A (zh) | 2009-05-01 | 2012-05-02 | Fp创新研究中心 | 纳米晶纤维素膜虹彩波长的控制 |
DE102010012437A1 (de) * | 2010-03-19 | 2011-09-22 | Friedrich-Schiller-Universität Jena | Mehrphasige Biomaterialien auf Basis bakteriell synthetisierter Nanocellulose und Verfahren zu ihrer Herstellung |
FI126513B (fi) | 2011-01-20 | 2017-01-13 | Upm Kymmene Corp | Menetelmä lujuuden ja retention parantamiseksi ja paperituote |
SE538243C2 (sv) * | 2012-11-09 | 2016-04-12 | Stora Enso Oyj | Förfarande för att bilda och därefter torka ett kompositmaterial innefattande en mikrofibrillerad cellulosa |
SE538085C2 (sv) * | 2012-11-09 | 2016-03-01 | Stora Enso Oyj | Torknings- och blandningsförfarande för mikrofibrillerad cellulosa |
KR101300625B1 (ko) * | 2013-02-26 | 2013-08-27 | 농업회사법인 주식회사 자담 | 미생물 셀룰로오스 겔 제조방법 |
US9850512B2 (en) | 2013-03-15 | 2017-12-26 | The Research Foundation For The State University Of New York | Hydrolysis of cellulosic fines in primary clarified sludge of paper mills and the addition of a surfactant to increase the yield |
US9951363B2 (en) | 2014-03-14 | 2018-04-24 | The Research Foundation for the State University of New York College of Environmental Science and Forestry | Enzymatic hydrolysis of old corrugated cardboard (OCC) fines from recycled linerboard mill waste rejects |
SE539960C2 (en) | 2016-04-11 | 2018-02-13 | Stora Enso Oyj | Method of forming an aqueous solution comprising microfibrillated cellulose by releasing microfibrillated cellulose from a dried composite material |
WO2019004950A1 (en) * | 2017-06-30 | 2019-01-03 | Scg Packaging Public Company Limited | HIGH STRENGTH SHEET MATERIAL |
JP2022517739A (ja) | 2018-12-28 | 2022-03-10 | ユニベルズィダード ドゥ ミンホ | バクテリアセルロースの配合物、方法および使用法 |
CN111138719A (zh) * | 2019-11-25 | 2020-05-12 | 中国制浆造纸研究院有限公司 | 一种含纳米纤维素的粉体的制备方法 |
EP4314312A1 (en) * | 2021-03-26 | 2024-02-07 | Cellugy ApS | Bacterial cellulose suspensions |
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DE3689940T2 (de) * | 1985-04-16 | 1995-02-23 | Agency Ind Science Techn | Formmasse auf Basis von bakteriell hergestellter Cellulose. |
US4863565A (en) * | 1985-10-18 | 1989-09-05 | Weyerhaeuser Company | Sheeted products formed from reticulated microbial cellulose |
BR8800781A (pt) * | 1988-02-24 | 1989-09-19 | Bio Fill Produtos Biotecnologi | Processo para a preparacao de suspensoes ou pastas aquosas de microfibrilas de celulose,suspensao ou pasta aquosa de microfibrilas de celulose e utilizacao |
US5207826A (en) * | 1990-04-20 | 1993-05-04 | Weyerhaeuser Company | Bacterial cellulose binding agent |
US5228900A (en) * | 1990-04-20 | 1993-07-20 | Weyerhaeuser Company | Agglomeration of particulate materials with reticulated cellulose |
JP3102705B2 (ja) * | 1991-08-15 | 2000-10-23 | 味の素株式会社 | バクテリアセルロースの離解法 |
JPH08127601A (ja) * | 1994-10-28 | 1996-05-21 | Bio Polymer Res:Kk | 濾水度調整剤 |
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1997
- 1997-06-09 EP EP97924349A patent/EP0846703A4/en not_active Withdrawn
- 1997-06-09 KR KR1019980701207A patent/KR19990037728A/ko not_active Application Discontinuation
- 1997-06-09 US US09/011,478 patent/US6153413A/en not_active Expired - Lifetime
- 1997-06-09 WO PCT/JP1997/001949 patent/WO1997048730A1/ja not_active Application Discontinuation
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JPS63294794A (ja) * | 1987-05-26 | 1988-12-01 | Daicel Chem Ind Ltd | バクテリアセルロ−ス膜の乾燥法 |
JPH01132897A (ja) * | 1987-11-19 | 1989-05-25 | Sanyo Kokusaku Pulp Co Ltd | 中性抄紙方法 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011202101A (ja) * | 2010-03-26 | 2011-10-13 | Toppan Printing Co Ltd | シートおよびその製造方法 |
JP2020516299A (ja) * | 2017-04-11 | 2020-06-11 | ナノローズ リミテッド | 植物成長培地及びその作製方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0846703A4 (en) | 1999-09-15 |
KR19990037728A (ko) | 1999-05-25 |
US6153413A (en) | 2000-11-28 |
EP0846703A1 (en) | 1998-06-10 |
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