EP0904452A1 - Substituts de l'amidon modifie utilises dans la fabrication du papier - Google Patents

Substituts de l'amidon modifie utilises dans la fabrication du papier

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Publication number
EP0904452A1
EP0904452A1 EP96921569A EP96921569A EP0904452A1 EP 0904452 A1 EP0904452 A1 EP 0904452A1 EP 96921569 A EP96921569 A EP 96921569A EP 96921569 A EP96921569 A EP 96921569A EP 0904452 A1 EP0904452 A1 EP 0904452A1
Authority
EP
European Patent Office
Prior art keywords
glucan
glucosyltransferase
produced
starch
mutant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96921569A
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German (de)
English (en)
Inventor
Scott E. Nichols
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Hi Bred International Inc
Original Assignee
Pioneer Hi Bred International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Hi Bred International Inc filed Critical Pioneer Hi Bred International Inc
Priority to EP00110805A priority Critical patent/EP1048730A3/fr
Publication of EP0904452A1 publication Critical patent/EP0904452A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D21H17/005—Microorganisms or enzymes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
    • C08B37/0009—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/10—Transferases (2.)
    • C12N9/1048—Glycosyltransferases (2.4)
    • 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
    • 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
    • C12P19/18—Preparation of compounds containing saccharide radicals produced by the action of a glycosyl transferase, e.g. alpha-, beta- or gamma-cyclodextrins
    • 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
    • D21H19/00—Coated paper; Coating material

Definitions

  • the present invention involves the field of paper manufacture. Specifically, the present invention provides sources alternative to modified starch in paper manufacture.
  • the second phase in paper manufacturing involving starch is the "sizing step".
  • the paper goes through a sizing press where a starch slurry is applied to the sheet.
  • the sheet again goes through a series of foils and rolls. It is dried on rollers and can be taken off the press as a finished product.
  • the third step involves coating the paper with a mixture of starch and a thermoplastic molecule. On certain lines, this occurs after the sizing step.
  • the nascent roll can also be removed and reinstalled onto a different press for coating.
  • a typical coating device has two blades that run the width of the paper. The blades apply the coating material onto two rolling drums. The paper passes between the drums and the coating material, comprising starch and the thermoplastic moiety, comes off the drums onto the paper. After the paper leaves the drums, it goes through a number of dryers. When the paper is dry, it goes onto a "soft calendar" comprising two drums, one made of a hard density fabric and the other a heated steel drum. The paper passes between the two drums and the heated steel drum is sufficiently hot to melt thermoplastic components of the coating mix providing a hard gloss finish on the paper.
  • the cellulosic wood pulp fibers typically used in the above process, are anionic in nature.
  • a cationic starch to the "wet end" slurry acts as an adhesive by cross linking the pulp fibers through salt linkages.
  • a cross linked polymeric network is made, comprising the starch and cellulose fibers.
  • the cationic starches used in the "wet end” are tertiary or quaternary amines. These amino groups are added to the starch by wet millers.
  • sizing starches are used to impart both strength and smooth finish to the sheet after it leaves the "wet end". Such starches also prepare the sheet to receive the various coatings.
  • sizing starches are used simply as unmodified corn starch.
  • chemically-modified starches are used for high grades of paper. This is important for the application of a smooth, uniform high quality surface to the paper.
  • starches to retrograde i.e. re ⁇ form high ordered structures (both helices and crystallites) in an otherwise gelatinous starch slurry. Deposition of retrograded starch onto high quality paper causes regional inconsistencies on the paper and is unacceptable.
  • retrograded starch in the sizing press may necessitate shutting the line down to clear the apparatus.
  • the starch most often used for sizing applications is a starch having a covalently attached neutral adduct, for instance hydroxyethyl starch. This is prepared by the reaction of ethylene oxide with starch after it is isolated at the wet milling plant.
  • the function of the hydroxyethyl (or similar) adduct is independent of its chemical nature; rather, it serves to provide steric hindrance, inhibiting the formation of high ordered structures. This steric hindrance is critical to decrease retrogradation.
  • the periodic protuberance afforded by the adduct disrupts the formation of higher ordered structures that leads to retrogradation.
  • Hydroxethylated starch also forms higher ordered structures as the temperature decreases or the concentration increases.
  • the formation of the higher ordered structures on the surface of the paper is required. After application to the sheet the starch reforms some of these higher ordered structures and creates a uniform surface that imparts structural strength and facilitates the acceptance of inks and dyes.
  • the higher ordered structures should not form in the slurry nor on the application device because this necessitates shutting down the production line to clear off retrograded starch.
  • the function of the hydroxyethyl group is to lower the temperature and/or raise the concentration of starch at which retrogradation occurs.
  • a decrease in the tendency to retrograde would allow for a higher carbohydrate content in the slurry.
  • the mixture applied to the paper sheet in the coating process contains hydroxethylated starch and thermoplastic molecules.
  • the most prevalent thermoplastic molecules used are latexes, such as styrene butadiene.
  • the function of the hydroxethyl starch is as indicated above.
  • the function of the thermoplastic molecule is to form a high gloss finish on the paper. This causes an increased ability to take inks and dyes and improves the resolution, in general, on the printed sheet.
  • thermoplastic molecules currently used in the coating step during paper manufacture.
  • the present invention provides glucans which can be used as substitutes for modified starch and/or latex in paper manufacturing.
  • the present glucans are produced by glucosyltransferase B ("GTF B") enzymes of the species
  • Streptococcus mutans are functionally similar to the modified starch currently used in paper manufacturing.
  • the present glucans also exhibit similar physical properties to the thermoplastic molecules currently used in the coating step of paper manufacturing.
  • the present invention also provides methods of manufacturing paper utilizing the present glucans, input materials that are produced biologically. Thus, the present methods are more cost-effective and environmentally-friendly than current methods which require input materials producing chemical effluents.
  • glucan means a glucose polymer having linkages that are ⁇ (l—»3), ⁇ (l->6), and branching ⁇ (l—>3,6) .
  • amyloplast means starch accumulating organelle in plant storage tissue.
  • vacuum means the cellular compartment bounded by the tonoplast membrane.
  • Streptococcus mutans is a species that is endogenous to the oral cavity and colonizes tooth enamel. See e.g. Kuramitsu, "Characterization of Extracellular Glucosyl Transferase Activity of Streptococcus-mutans. " Infect. Immun. ; Vol. 12(4); pp.738-749; (1975); and Yamashita, et al., "Role of the Streptococcus-Mutans-gtf Genes in Caries Induction in the Specific-Pathogen-Free Rat Model," Infect. Immun. ; Vol. 61(9); pp. 3811-3817; (1993); both incorporated herein their entirety by reference.
  • GTF B glucosyltransferase B
  • the proteins involved are large (-155 kDa) and catalyze the group transfer of the glucosyl portion of sucrose to an acceptor glucan via oc (l-»3) and oc (l- 6) linkages. See e.g., Wenham, et al., "Regulation of Glucosyl Transferase and Fructosyl Transferase Synthesis by Continuous Cultures of Streptococcus-mutans," _ ⁇ Gen. Microbiol . ; Vol. 114 (Part 1); pp. 117-124; (1979); Fu, et al .
  • GTF B enzyme activity incorporated into the amyloplast and/or vacuole leads to the accumulation of starch and glucan in the same amyloplast and/or vacuole.
  • Retrogradation occurs as portions of starch molecules interact and subsequently form inter- or intra-chain helices.
  • the frequency of starch-starch interactions, that lead to helix formation is diminished.
  • a paste made from the mixed polymers is less prone to retrogradation as a result. This is especially true in the starch accumulation mutants envisioned as transformation targets where the relative proportion of starch is reduced.
  • Glucans produced in maize amyloplasts and/or vacuoles by the transgenic GTF B enzymes can function in paper processing without chemical modification, as required of starch.
  • the polymer solution consequently has altered rheological properties and is less prone to retrogradation compared to starch.
  • the glucans are branched and irregular and able to supplant modified starches with comparable or superior efficacy. They do not require any costly chemical modification as does starch.
  • the present glucans exhibit thermoplastic properties in addition to the above advantages.
  • mutant GTF B enzymes used to produce the present glucans is as follows: the number refers to the amino acid position in the polypeptide chain; the first letter refers to the amino acid in the wild type enzyme; the second letter refers to the amino acid in the mutated enzyme; and enzymes with multiple mutations have each mutation separated by /.
  • the mutant GTF B enzyme used to produce glucans for paper coating is preferably selected from the group consisting of I448V; D457N; D567T; K1014T; D457N/D567T;
  • the mutant GTF B enzyme used to produce glucans for paper coating is more preferably selected from the group consisting of I448V; K1014T;D567T/D571K/K1014T;
  • the mutant GTF B enzyme used to produce glucans for paper coating is even more preferably selected from the group consisting of K1014T;
  • the mutant GTF B enzyme used to produce glucans for paper coating is most preferably I448V/D457N/D567T/
  • the mutant GTF B enzyme used to produce glucans for paper sizing is preferably selected from the group consisting ofI448V; D457N; D567T; K779Q; K1014T;
  • D457N/D567T D457N/D571K; D567T/D571K and D567T/D571K/K1014T.
  • the mutant GTF B enzyme used to produce glucans for paper sizing is more preferably selected from the group consisting of I448V; D457N: K779Q; D567T/D571K; and D567T/D571K/K1014T.
  • the mutant GTF B enzyme used to produce glucans for paper sizing is most preferably I448V.
  • the glucans of the present invention are preferably produced in transgenic maize, potato, cassava, sweet potato, rye, barley, wheat, sorghum, oats, millet, triticale, sugarcane or rice. More preferably, the present glucans are produced in maize, potato, sugarcane, cassava or sweet potato. Even more preferably, the present glucans are produced in maize or potato. Most preferably, the present glucans are produced in maize. In a highly preferred embodiment of the present invention, maize lines deficient in starch biosynthesis are transformed with mutant GTF B genes. Such lines may be naturally occurring maize mutants (i.e.
  • the production of the present glucans is performed according to methods of transformation that are well known in the art, and thus constitute no part of this invention.
  • the compounds of the present invention are synthesized by insertion of an expression cassette containing a synthetic gene which, when transcribed and translated, yields a GTF enzyme that produces the desired glucan.
  • Such empty expression cassettes providing appropriate regulatory sequences for plant expression of the desired sequence, are also well-known, and the nucleotide sequence for the synthetic gene, either RNA or DNA, can readily be derived from the amino acid sequence for the protein using standard texts and the references provided.
  • the above-mentioned synthetic genes preferably employ plant-preferred codons to enhance expression of the desired protein.
  • compositions of this invention and the methods of making and using them.
  • other methods known by those of ordinary skill in the art to be equivalent, can also be employed.
  • genes which code for the present enzyme or mutants can be inserted into an appropriate expression cassette and introduced into cells of a plant species.
  • an especially preferred embodiment of this method involves inserting into the genome of the plant a DNA sequence coding for a mutant or wild type gene in proper reading frame, together with transcription promoter and initiator sequences active in the plant. Transcription and translation of the DNA sequence under control of the regulatory sequences causes expression of the protein sequence at levels which provide an elevated amount of the protein in the tissues of the plant.
  • Synthetic DNA sequences can then be prepared which code for the appropriate sequence of amino acids of a GTF B protein, and this synthetic DNA sequence can be inserted into an appropriate plant expression cassette.
  • expression cassette is meant a complete set of control sequences including promoter, initiation, and termination sequences which function in a plant cell when they flank a structural gene in the proper reading frame.
  • Expression cassettes frequently and preferably contain an assortment of restriction sites suitable for cleavage and insertion of any desired structural gene. It is important that the cloned gene have a start codon in the correct reading frame for the structural sequence.
  • vector herein is meant a DNA sequence which is able to replicate and express a foreign gene in a host cell.
  • the vector has one or more restriction endonuclease recognition sites which may be cut in a predictable fashion by use of the appropriate enzyme such vectors are preferably constructed to include additional structural gene sequences imparting antibiotic or herbicide resistance, which then serve as markers to identify and separate transformed cells.
  • Preferred markers/selection agents include kanamycin, chlorosulfuron, phosphonothricm, hygromycin and methotrexate.
  • a cell m which the foreign genetic material in a vector is functionally expressed has been "transformed" by the vector and is referred to as a "transformant" .
  • a particularly preferred vector is a plasmid, by which is meant a circular double-stranded DNA molecule which is not a part of the chromosomes of the cell.
  • genomic DNA and cDNA encoding the gene of interest may be used in this invention.
  • the gene of interest may also be constructed partially from a cDNA clone and partially from a genomic clone.
  • genetic constructs are made which contain the necessary regulatory sequences to provide for efficient expression of the gene m the host cell.
  • the genetic construct will contain (a) a genetic sequence coding for the protein or trait of interest and (b) one or more regulatory sequences operably linked on either side of the structural gene of interest.
  • the regulatory sequences will be selected from the group comprising of promoters and terminators.
  • the regulatory sequences may be from autologous or heterologous sources.
  • the expression cassette comprising the structural gene for a mutant of this invention operably linked to the desired control sequences can be ligated into a suitable cloning vector.
  • plasmid or viral (bacteriophage) vectors containing replication and control sequences derived from species compatible with the host cell are used.
  • the cloning vector will typically carry a replication origin, as well as specific genes that are capable of providing phenotypic selection markers in transformed host cells. Typically, genes conferring resistance to antibiotics or selected herbicides are used. After the genetic material is introduced into the target cells, successfully transformed cells and/or colonies of cells can be isolated by selection on the basis of these markers.
  • an intermediate host cell will be used in the practice of this invention to increase the copy number of the cloning vector.
  • the vector containing the gene of interest can be isolated in significant quantities for introduction into the desired plant cells.
  • Host cells that can be used in the practice of this invention include prokaryotes, including bacterial hosts such as E. coli, S. typhimurium, and Serratia marcescens.
  • Eukaryotic hosts such as yeast or filamentous fungi may also be used in this invention. Since these hosts are also microorganisms, it will be essential to ensure that plant promoters which do not cause expression of the protein in bacteria are used in the vector.
  • the isolated cloning vector will then be introduced into the plant cell using any convenient technique, including electroporation (in protoplasts) , retroviruses, bombardment, and microinjection into cells from onocotyledonous or dicotyledonous plants in cell or tissue culture to provide transformed plant cells containing as foreign DNA at least one copy of the DNA sequence of the plant expression cassette.
  • electroporation in protoplasts
  • retroviruses retroviruses
  • bombardment and microinjection into cells from onocotyledonous or dicotyledonous plants in cell or tissue culture to provide transformed plant cells containing as foreign DNA at least one copy of the DNA sequence of the plant expression cassette.
  • protoplasts can be regenerated and cell or tissue culture can be regenerated to form whole fertile plants which carry and express the gene for a protein according to this invention.
  • a highly preferred embodiment of the present invention is a transformed maize plant, the cells of which contain as foreign DNA at least one copy of the DNA sequence of an expression cassette of a GTF B mutant
  • this invention provides a method for introducing GTF B in Agrobacterium tumefaciens- susceptible dicotyledonous plants in which the expression cassette is introduced into the cells by infecting the cells with Agrobacterium tumefaciens, a plasmid of which has been modified to include a plant expression cassette of this invention.
  • the potato plant can be transformed via Agrobacterium tumefaciens to produce the present glucans.
  • the transformation cassette comprises a patatin promoter, followed by the relevant GTF B coding sequence and the neomycin phosphotransferase polyadenylation site/terminator. See e.g. Utsumi, et al., "Expression and Accumulation for Normal and Modified Soybean Glycinins in Potato Tubers," Plant Science; Vol. 102(2); pp. 181-188; (1994); (Limerick) ; incorporated herein in its entirety by reference.
  • the transgenic cassette is placed into a transformation vector.
  • BIN19 or derivatives thereof, are useful when transforming via Agrobacterium tumefaciens.
  • Agrobacterium tumefaciens See e.g. Visser, et al., "Transformation of Homozygous Diploid Potato with an Agrobacterium-tumefaciens Binary Vector System by Adventitious Shoot Regeneration on Leaf and Stem Segments," Plant Mol. Biol. ; Vol. 12(3) ; pp. 329-338; (1989) ; incorporated herein in its entirety by reference.
  • the promoters include any promoter whose expression is specific and limited to endosperm cells. Included are those encoding either 22 kDa zein, opaque2, gamma zein and waxy. These lead into the GTF B gene and are followed by the endogenous terminator or the heterogeneous PINII terminator.
  • the GTF B protein are directed to the maize endosperm amyloplast using a suitable transit sequence. Transit sequences useful in directing the enzyme into the amyloplast for accumulation within the amyloplast include but are not limited to ribulose biophosphate carboxylase small subunit, waxy, brittle-1, and chlorophyll AB binding protein. The transit sequences are juxtaposed between the promoter and the GTF B coding sequence and fused in translational reading frame with the GTF B moiety.
  • Transit sequences useful in directing the enzyme into the vacuole for accumulation within the vacuole are well known in the art.
  • vacuolar targeting see e.g. Ebskamp, et al., "Accumulation of Fructose Polymers in Transgenic Tobacco," Bio/technology; Vol. 12; pp. 272-275; (1994); incorporated herein in its entirety by reference.
  • maize transformation and regeneration see e.g.
  • the glucans synthesized can be isolated, by standard methods, known to one skilled in the art.
  • the glucan thus obtained in the transgenic plant can be substituted for modified starches and utilized in the sizing and/or coating steps.
  • formulations useful in the coating step see e.g. Heiser, et al., "Starch Formations,” Starch and Starch Products in Paper Coating; Kearney, et al., eds., pp. 147-162; (1990); Tappi Press; incorporated herein in its entirety by reference.
  • the present glucans are utilized in an amount of from about 4 to about 15 weight percent, more preferably from about 5 to about 12 weight percent, also preferably from about 6 to about 8 weight percent. Weight percent is defined as grams of molecule per 100 ml solution.
  • the present glucans are used to replace the starch and/or latex molecules completely, or a starch-glucan or a latex-glucan mixture is used in the slurry.
  • the glucan:starch ratio ranges from about 10:90 to about 100:0; more preferably from about 40:60 to about 100:0; more preferably still from about 60:40 to about 100:0; most preferably about 100:0.
  • the glucan:starch ratio ranges from about 10:90 to about 100:0; more preferably from about 40:60 to about 100:0; more preferably still from about 60:40 to about 100:0; most preferably about 100:0.
  • the glucan:latex ratio ranges from about 10:90 to about 100:0; more preferably from about 40:60 to about 100:0; more preferably still from about 60:40 to about 100:0; most preferably about 100:0.

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Abstract

Cette invention se rapporte à des procédés de fabrication du papier qui utilisent des glucanes, produits par les enzymes glucosyltransférases B de l'espèce Streptococcus mutans, au lieu d'amidons modifiés. Ces glucanes sont fonctionnellement similaires à l'amidon modifié hydroxéthyle et ils sont particulièrement utiles dans les étapes d'encollage et d'enduction lors de la fabrication du papier. Ces glucanes possèdent également des propriétés thermoplastiques et confèrent un effet glacé au papier pendant l'étape d'enduction.
EP96921569A 1996-06-12 1996-06-12 Substituts de l'amidon modifie utilises dans la fabrication du papier Withdrawn EP0904452A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00110805A EP1048730A3 (fr) 1996-06-12 1996-06-12 Streptococcus mutans glucosyltransférase B mutées

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1996/010190 WO1997047806A1 (fr) 1996-06-12 1996-06-12 Substituts de l'amidon modifie utilises dans la fabrication du papier

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP00110805A Division EP1048730A3 (fr) 1996-06-12 1996-06-12 Streptococcus mutans glucosyltransférase B mutées

Publications (1)

Publication Number Publication Date
EP0904452A1 true EP0904452A1 (fr) 1999-03-31

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EP96921569A Withdrawn EP0904452A1 (fr) 1996-06-12 1996-06-12 Substituts de l'amidon modifie utilises dans la fabrication du papier

Country Status (5)

Country Link
EP (1) EP0904452A1 (fr)
JP (1) JP2001503607A (fr)
AU (1) AU731229B2 (fr)
CA (1) CA2257621C (fr)
WO (1) WO1997047806A1 (fr)

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US5712107A (en) * 1995-06-07 1998-01-27 Pioneer Hi-Bred International, Inc. Substitutes for modified starch and latexes in paper manufacture
US6087559A (en) * 1995-06-07 2000-07-11 Pioneer Hi-Bred International, Inc. Plant cells and plants transformed with Streptococcus mutans genes encoding wild-type or mutant glucosyltransferase B enzymes
US6284479B1 (en) 1995-06-07 2001-09-04 Pioneer Hi-Bred International, Inc. Substitutes for modified starch and latexes in paper manufacture
WO1997047808A1 (fr) * 1996-06-12 1997-12-18 Pioneer Hi-Bred International, Inc. Substituts de l'amidon modifie utilises dans la fabrication du papier
CL2007003744A1 (es) 2006-12-22 2008-07-11 Bayer Cropscience Ag Composicion que comprende un derivado 2-piridilmetilbenzamida y un compuesto insecticida; y metodo para controlar de forma curativa o preventiva hongos fitopatogenos de cultivos e insectos.
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AU6276796A (en) 1998-01-07
CA2257621C (fr) 2003-02-04

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