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WO1997013628A1 - Blanchiment et sterilisation d'articles en liege - Google Patents

Blanchiment et sterilisation d'articles en liege Download PDF

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Publication number
WO1997013628A1
WO1997013628A1 PCT/DK1996/000417 DK9600417W WO9713628A1 WO 1997013628 A1 WO1997013628 A1 WO 1997013628A1 DK 9600417 W DK9600417 W DK 9600417W WO 9713628 A1 WO9713628 A1 WO 9713628A1
Authority
WO
WIPO (PCT)
Prior art keywords
bath
catalase
peroxide
cork
enzyme
Prior art date
Application number
PCT/DK1996/000417
Other languages
English (en)
Inventor
Ramiro Martinez
Lars Sparre Conrad
Maria da Conceição GOMES
Paula Vieira Neto
Original Assignee
Novo Nordisk A/S
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 Novo Nordisk A/S filed Critical Novo Nordisk A/S
Priority to EP96932469A priority Critical patent/EP0853533A1/fr
Priority to AU71260/96A priority patent/AU7126096A/en
Publication of WO1997013628A1 publication Critical patent/WO1997013628A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/002—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process employing compositions comprising microorganisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/04—Impregnating in open tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K7/00—Chemical or physical treatment of cork

Definitions

  • This invention relates to a method for bleaching and/or sterilizing cork articles, such as cork stoppers
  • Cork stoppers for use in wine bottles etc. have commonly been bleached and sterilized by a treatment with hypochlorite at alkaline pH, followed by a treatment with oxalic acid.
  • hypochlorite increases the risk of forming undesirable chlorinated organic compounds and provides inadequate protection o f the cork against subsequent microbial contamination and growth.
  • H 2 0 2 Bleaching of cork stoppers with hydrogen peroxide (H 2 0 2 ) has therefore become increasingly common.
  • a residual content of H 2 0 2 is generally unacceptable in cork stoppers to be used in food and beverage products.
  • residual H 2 0 2 can be detrimental to bottled wine, reducing sulfur dioxide content and causing oxidation.
  • the cork articles are treated by immersion in a peroxide bath, followed by rinsing, immersion in a citric acid bath, drying and resting.
  • the resting time can be up to several weeks.
  • This process has the disadvantage of a very long total processing time, and further the removal is not efficient when high concentrations of hydrogen peroxide are used.
  • disposal of the spent citric acid bath involves a large quantity of waste water with high values of BOD and COD.
  • US 4,693,757 proposes washing with alkali, followed by a short-time treatment with hydrogen peroxide and hot-air drying.
  • FR 2,569,369 and FR 2,635,292 propose processes which include washing with an alkaline solution of H 2 0 2 , followed by washing with an acidic solution and drying.
  • FR 2,639,282 proposes a process which includes sprinkling the cork stoppers with an alkaline solution of H 2 0 2 in a rotating drum, followed by blowing hot air and expelling the evolved gases.
  • US 5,098,447 proposes impregnation with H 2 0 2 and alkali, followed by drying by exposure to ultraviolet radiation.
  • cork articles are first contacted with a hydrogen peroxide solution, followed by contacting with a solution of the enzyme catalase.
  • the quality of cork articles treated by this process can meet the usual industry requirements in terms of residual H 2 0 2 , mechanical properties etc.
  • the total processing time can be kept short, e.g. about one hour in total for the peroxide treatment and the catalase treatment.
  • the waste water problems can be reduced because the BOD and COD of the waste water are low, and because the quantity of waste water can be reduced by repeated use of the same catalase bath.
  • the process of the invention is applicable to any cork article requiring bleaching and/or sterilization, such as tiles, sheets and stoppers.
  • cork articles for use in the food or beverage industry, e.g. cork stoppers for wine bottles.
  • the contact with hydrogen peroxide serves to effect the desired bleaching and/or sterilization of the cork articles.
  • the H 2 0 2 concentration in the bath may be chosen as required to achieve the required degree of bleaching and sterilization, typically in the range 10-500 g/l.
  • a high concentration, e.g. 100-500 g/l may be preferred to achieve a very efficient bleaching and sterilization, and advantageously the process of the invention allows efficient H 2 0 2 removal, even at such high concentrations.
  • the hydrogen peroxide bleaching can be performed in a conventional manner.
  • Typical conditions include a contact time in the range of 10-60 minutes (particularly 15-30 minutes) at an alkaline pH (e.g. pH 10-11) and a temperature near ambient, e.g. 20-70°C.
  • H 2 0 2 solution may further comprise NaOH and/or peracetic acid for improved effect.
  • the cork articles may be brought into contact with the solution of H 2 0 2 by any convenient method, e.g. by immersing the cork articles in the solution or by spraying the solution onto the cork articles.
  • the contact with H 2 0 2 can be followed by a rinsing with water, before the contact with catalase, but this rinsing step is usually not needed, and it is preferred to avoid it, resulting in a simpler process.
  • the catalase to be used is an enzyme that catalyzes the disintegration of hydrogen peroxide. It has the Enzyme Nomenclature number EC 1.11.1.6. It is preferred to use a catalase which has good activity and stability at the process conditions which may include alkaline pH and high H 2 0 2 concentration.
  • catalase derived from a microorganism since such enzymes can be produced economically.
  • the catalase is preferably derived from a strain of the genus Aspergillus, Scytalidium, Humicola , Penicillium Thermoascus,
  • the catalase may be produced according to WO 92/17571 (Novo Nordisk A/S) , JP-A 2- 76579 (Novo Nordisk A/S) , JP-A 63-3788 (Mitsubishi Gas Chemical) , JP-A 4-20288 (Kurita Water Industries) , WO 93/18166 (Genencor Int'l) , JP-A 7-163342 (Mitsubishi Gas Chemical) , JP-A 5-153975 (Mitsubishi Gas Chemical) , JP-A 62-228271 (Nippon Peroxide) or JP-A 55-135588 (Mitsubishi Petrochemical) .
  • catalase preparations for use in this invention are Catazyme * , Novozym * 355, Terminox * 10L and Terminox Ultra 50 (products of Novo Nordisk A/S) ; KuribataTM K-310, X -502 ReyonetTM (product of Nagase) , OxydexTM and Ask SuperTM 25 (Mitsubishi Gas Chemical) .
  • the contact with catalase serves to remove H 2 0 2 from the cork articles to a degree which is acceptable for the intended use of the articles. Typically, more than 90% (e.g. more than 95%, and even more than 99%) of the H 2 0 2 will be removed.
  • the same catalase bath is used repeatedly two or more times, e.g. 2-20 times, particularly 5-10 times, to reduce the costs for catalase and for waste water treatment .
  • a convenient schedule may involve using the same catalase bath repeatedly throughout one working day (e.g. 5-10 times) and then disposing of the spent bath at the end of the day.
  • the catalase bath was found to retain its efficiency throughout this schedule.
  • the contact with catalase can be done e.g. by immersion of the cork articles in a catalase bath or by spraying with a catalase solution.
  • the contacting comprises immersing the cork articles in a catalase bath, removing them from the bath and holding them outside the bath for a resting period.
  • the catalase continues to act throughout the total contact time of immersion and resting. It is usually convenient to use a total contact time of 10-60 minutes, particularly 20-40 minutes.
  • a suitable temperature for the treatment is in the range 5-70°C, preferably 20-60°C. Generally, no pH adjustment is needed.
  • the cork articles can optionally be rinsed with water and/or dried by conventional methods.
  • One CIU is defined as the amount of enzyme that decomposes 1 ⁇ mole of H 2 0 2 per minute at pH 7.0, 25°C, while the H 2 0 2 concentration decreases from 10.3 to 9.2 ⁇ moles per ml in the reaction mixture. Determination of resistance to compression
  • cork stoppers are immersed in about 10 ml of "standard wine” (Portuguese “verde” white dry) so as to allow 5 mm of the cork stopper to be in contact with the wine. After standing in this way for 24 hours, sensory analysis is performed classifying olfactive characteristics of wine according to the following scale:
  • a panel of 30 is used, and a weighted average of the individual results is calculated.
  • Terminox from Scytalidiiu ⁇
  • Catazyme from Aspergillus niger
  • Cork stoppers were treated in the same manner as in Example 1, except that the catalase concentration was kept at 100 kCIU/1, and the peroxide concentration and catalase contact time were varied as shown below. The results were as follows: Peroxide Immersion Resting time Peroxide concentrat time in after enzyme quantity ion (g/l) enzyme bath bath (mg/cork (minutes) (minutes) stopper) Terminox Catazyme
  • Cork stoppers were treated at industrial scale by immersion in peroxide bath, rinsing, immersion in enzyme bath, rinsing, and drying.
  • the enzyme used was Catazyme, and the process conditions were as follows:
  • the quality of the cork stoppers meets accepted industry standards with a sensory classification of "sufficient” to "good” .
  • Cork stoppers were treated at industrial scale by immersion in peroxide bath, resting, immersion in enzyme bath, resting, and drying.
  • the enzyme used was Catazyme, and the process conditions were as follows:

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Microbiology (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Detergent Compositions (AREA)

Abstract

On blanchit et/ou stérilise des articles en liège selon un procédé consistant à mettre ces articles d'abord en contact avec une solution de peroxyde d'hydrogène, puis avec une solution contenant l'enzyme catalase. La qualité des articles en liège ainsi traités est conforme aux exigences industrielles habituelles en termes de propriétés mécaniques, de H2O2 résiduel, etc.. On peut enlever H2O2 jusqu'à obtenir des teneurs en H2O2 très basses, même lorsque l'on utilise des concentrations élevées de peroxyde. Il n'est généralement pas nécessaire de rincer après traitement au peroxyde. On peut utiliser de manière répétée la solution de catalase. Il est possible de maintenir un temps de traitement court, par exemple environ une heure en tout pour les traitements au peroxyde et à la catalase. Les demandes biochimique et chimique en oxygène (D.B.O. et D.C.O.) des eaux résiduelles sont faibles et on peut réduire la quantité d'eaux résiduelles en faisant un usage répété du même bain de catalases.
PCT/DK1996/000417 1995-10-06 1996-10-03 Blanchiment et sterilisation d'articles en liege WO1997013628A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP96932469A EP0853533A1 (fr) 1995-10-06 1996-10-03 Blanchiment et sterilisation d'articles en liege
AU71260/96A AU7126096A (en) 1995-10-06 1996-10-03 Bleaching and sterilization of cork articles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1120/95 1995-10-06
DK112095 1995-10-06

Publications (1)

Publication Number Publication Date
WO1997013628A1 true WO1997013628A1 (fr) 1997-04-17

Family

ID=8101239

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1996/000417 WO1997013628A1 (fr) 1995-10-06 1996-10-03 Blanchiment et sterilisation d'articles en liege

Country Status (5)

Country Link
EP (1) EP0853533A1 (fr)
AU (1) AU7126096A (fr)
ES (1) ES2120391T1 (fr)
WO (1) WO1997013628A1 (fr)
ZA (1) ZA968313B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0835927A3 (fr) * 1996-10-14 1999-01-13 Bayer Ag Enlèvement du peroxyde d'hydrogène dans les bains de blanchiment
WO1999058309A1 (fr) * 1998-05-13 1999-11-18 Novo Nordisk A/S Traitement du liege avec une enzyme d'oxydation de phenol
US6152966A (en) * 1998-05-13 2000-11-28 Novo Nordisk A/S Treatment of cork with a phenol oxidizing enzyme
EP2657195A1 (fr) * 2012-04-23 2013-10-30 Kim Naatz Utilisation de catalase dans des installations de remplissage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223479A2 (fr) * 1985-11-08 1987-05-27 Minnesota Mining And Manufacturing Company Article et procédé pour la neutralisation enzymatique de peroxyde d'hydrogène
US5071439A (en) * 1988-02-24 1991-12-10 Sandoz Ltd. Process for bleaching textile material
US5145644A (en) * 1990-12-20 1992-09-08 Allergan, Inc. Hydrogen peroxide destroying compositions and methods of making and using same
WO1993017721A1 (fr) * 1992-03-04 1993-09-16 Genencor International, Inc. NEUTRALISATION DE L'EAU OXYGENEE PAR LA CATALASE-R D'$i(ASPERGILLUS NIGER)
WO1994017833A1 (fr) * 1993-02-12 1994-08-18 Allergan, Inc. Procedes et compositions de destruction de peroxyde d'hydrogene

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223479A2 (fr) * 1985-11-08 1987-05-27 Minnesota Mining And Manufacturing Company Article et procédé pour la neutralisation enzymatique de peroxyde d'hydrogène
US5071439A (en) * 1988-02-24 1991-12-10 Sandoz Ltd. Process for bleaching textile material
US5145644A (en) * 1990-12-20 1992-09-08 Allergan, Inc. Hydrogen peroxide destroying compositions and methods of making and using same
WO1993017721A1 (fr) * 1992-03-04 1993-09-16 Genencor International, Inc. NEUTRALISATION DE L'EAU OXYGENEE PAR LA CATALASE-R D'$i(ASPERGILLUS NIGER)
WO1994017833A1 (fr) * 1993-02-12 1994-08-18 Allergan, Inc. Procedes et compositions de destruction de peroxyde d'hydrogene

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STN INTERNATIONAL, DERWENT INFORMATION LTD, WPIDS Accession No. 96-134811, UCHIYAMA KOGYO KK: "Removing Residual Bleaching Agent on Cork Plug Bleaching-by Bleaching Cork Plug with Hydrogen Peroxide and Removing Residual Peroxide with Reducing Agent"; & JP,A,08 025 497, 30-01-96 (9614). *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0835927A3 (fr) * 1996-10-14 1999-01-13 Bayer Ag Enlèvement du peroxyde d'hydrogène dans les bains de blanchiment
WO1999058309A1 (fr) * 1998-05-13 1999-11-18 Novo Nordisk A/S Traitement du liege avec une enzyme d'oxydation de phenol
US6152966A (en) * 1998-05-13 2000-11-28 Novo Nordisk A/S Treatment of cork with a phenol oxidizing enzyme
EP2657195A1 (fr) * 2012-04-23 2013-10-30 Kim Naatz Utilisation de catalase dans des installations de remplissage

Also Published As

Publication number Publication date
EP0853533A1 (fr) 1998-07-22
ES2120391T1 (es) 1998-11-01
ZA968313B (en) 1997-04-07
AU7126096A (en) 1997-04-30

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