WO2000045860A1 - Sterile substrate and process for producing it - Google Patents
Sterile substrate and process for producing it Download PDFInfo
- Publication number
- WO2000045860A1 WO2000045860A1 PCT/GB2000/000340 GB0000340W WO0045860A1 WO 2000045860 A1 WO2000045860 A1 WO 2000045860A1 GB 0000340 W GB0000340 W GB 0000340W WO 0045860 A1 WO0045860 A1 WO 0045860A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- water
- process according
- base material
- absorbing
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/0005—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts
- A61L2/0011—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts using physical methods
- A61L2/0029—Radiation
- A61L2/007—Particle radiation, e.g. electron-beam, alpha or beta radiation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/0005—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts
- A61L2/0011—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts using physical methods
- A61L2/0029—Radiation
- A61L2/0035—Gamma radiation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/16—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using chemical substances
- A61L2/20—Gaseous substances, e.g. vapours
Definitions
- the present invention relates to sterile substrates suitable for use in microorganism cultivation, especially mushroom cultivation, and a process for their production.
- Mushroom cultivation usually involves, as a first step, generating a mushroom spawn which consists of a carrier material inoculated with mushroom mycelium.
- the purpose of the spawn is to boost the mycelium to a state of vigour where it can be launched into bulk substrates.
- the carrier material is typically cereal grain or enriched sawdust. It serves both as a vehicle for evenly distributing the mycelium and as a nutritional source which can support the expansion of the mycelial mass.
- the mushroom spawn is then transferred to a suitable moistened substrate for further growth.
- the intended substrate material must be sterilised, before mushroom spawn is transferred to it, in order to avoid contamination by competitor microorganisms such as other fungi or bacteria. Sterilisation is defined in the textbook "General Microbiology” by Stanier, Adelberg and Ingraham (4 th Edn), page 25, as a treatment that ⁇ -ees the treated object of all living organisms.
- the sterilisation of substrates for mushroom cultivation is usually carried out using steam.
- the sawdust is moistened until its water content is from 65 to 70% by weight. It is then filled into bags made of a polymeric material, such as polypropylene, which can withstand the temperature of sterilisation.
- the bags of moistened sawdust are typically subjected to steam sterilization in autoclaves which can be filled with steam at a pressure greater than atmospheric. Steam sterilisation is therefore usually achieved at temperatures considerably above the boiling point of water.
- the particular sterilisation conditions used will depend partly on the nature of the substrate.
- a fresh hardwood sawdust substrate would typically be sterilized for two to three hours at 17 psi whereas the same sawdust supplemented with bran (as a source of nitrogen) would need a longer period.
- bran as a source of nitrogen
- the need for thorough sterilization is therefore even more critical.
- This conventional steam sterilization technique For instance, prolonged steam sterilization at high temperatures can give rise to complex chemical transformations in the substrate material. Sawdust, for example, takes on a dark brown colour and a distinctly different odour signature when it has been subjected to steam sterilization under pressure for more than 5 hours.
- the sawdust tends as a result to resist decomposition by the mushroom mycelium, which is detrimental to mushroom growth.
- the sawdust is likely to be depleted in important minerals and trace elements as a result of steam sterilization. It is difficult to replace such substances following sterilization, though, because by then the substrate is wet and cannot readily absorb further additives.
- the present invention aims to overcome these and other drawbacks of the conventional process of steam sterilization. It accordingly provides a process for producing a sterile substrate suitable for use in microorganism cultivation, which process comprises exposing to radiation or heat, or submitting to chemical sterilisation, a substrate which has a moisture content throughout of 30% by weight or less and comprises a particulate base material capable of absorbing or entrapping water.
- the process comprises exposing to radiation a substrate which has a uniform moisture content throughout of 12 % by weight or less and comprises a particulate base material capable of absorbing or entrapping water.
- the sterile substrate produced by the process of the invention as defined above has a long shelf life. It has the added advantage that, since it is relatively dry, it is capable of absorbing additives and can thus be enriched, as will be described in more detail later on.
- the particulate base material should have a moisture content of 30% by weight or less, typically 25 % by weight or less, preferably 20 % by weight or less, more preferably 12 % by weight or less. It is frequently preferable for the moisture content to be uniform throughout the body of the substrate, especially when radiation is used to sterilise the substrate. If the specified moisture level instead represents an average value there will be areas within the material where the moisture content is higher than the specified level (as well as areas where the moisture content is much lower). Water is an insulator to radiation, so a radiation dose which can satisfactorily penetrate sawdust having a moisture content of, say, 30 % by weight would not fully sterilise these wetter areas.
- a dose of about 35 killer Grey (kG) of radiation is typically suitable for sterilising a substrate material with a water content of about 30
- a dose of about 10 killer Grey (kGy) of radiation is suitable for sterilising a substrate material with a water content of about 10% by weight.
- the process of the invention is applicable to the cultivation of any type of microorganism. Mushroom cultivation is particularly preferred but the process is equally applicable to other microorganisms such as yoghurt cultures, yeast, moulds and bacteria.
- the substrate is selected according to the type of microorganism which it is desired to cultivate, subject to the requirement that it should comprise a particulate base material capable of absorbing or entrapping water.
- the substrate may be a carrier material which is to be inoculated with mushroom mycelium to form a mushroom spawn, or it may be a bulk substrate into which a mushroom culture, for instance in the form of spawn, is subsequently injected for further growth.
- Typical examples of the substrate material for mushroom cultivation include wood fibre, usually in the form of sawdust or wood shavings; other fibrous cellulose- based natural materials such as coconut fibre; and cereal products.
- the term "cereal products” as used herein refers to the grain or straw of cereal and also to the seeds of other food crops such as peas, beans, maize and clover.
- Suitable cereals include rye, oats, millet, barley, wheat, rice, hemp and flax.
- Preferred examples of cereal products include the straw of hemp, flax and wheat.
- the particulate base material may be, for example, a material known as a superabsorber which is a water-absorbing polymer such as a cross-linked polyacrylate.
- a material may, for instance, be potassium-based or sodium- based.
- the base material may instead be a water-absorbing or water-entrapping mineral or ceramics substance, such as vermiculite or perlite.
- Vermiculite is a member of the phyllosilicate group of minerals and has the ability to expand to many times its original volume on heating.
- Perlite is a naturally occurring siliceous rock which, when heated to a suitable temperature in its softening range, expands to from 4 to 20 times its original volume.
- the base material may be any other natural or synthetic material which is porous or which is capable of absorbing or entrapping water, and which is in the form of particles.
- the wood is preferably a fast decomposing hardwood. Suitable examples include alder, poplar, ash, elm, beech, birch and cottonwood. Sawdust of these woods which is suitable for use in the process of the invention may be obtained, for instance, from furniture manufacturers or sawmills. The wood may alternatively be a composted softwood.
- the substrate material is other than one which contains intrinsic nutrients, such as a cereal product, it may if desired include an added source of nitrogen or protein.
- This may be, for instance, cereal bran, soybean bran, yeast, soy oil or peptone.
- the cereal bran is preferably the bran of rice, rye, wheat, corn or oats.
- the water and microorganism culture may conveniently be added in the form of liquid mushroom culture inoculum.
- This typically comprises mushroom mycelium in an enriched liquid suspension.
- the process of the invention as defined above further comprises adding liquid mushroom culture inoculum to the sterilised substrate.
- the water is typically enriched in order to provide an environment for optimum microorganism growth.
- An important advantage of the process of the present invention is the fact that the substrate is relatively dry following sterilization. This means that its capacity to absorb water at the time of inoculation with the microorganism culture, for instance liquid inoculum, is much greater than that of conventional wet-sterilized substrates.
- the added water is able to penetrate inside the individual particles of the substrate material rather than residing on the surface only. This in turn facilitates the introduction of nutrient substances which will support microorganism growth, since such substances can simply be dissolved or dispersed in the water which is added to the sterile substrate at the time of inoculation.
- the added nutrient substances are drawn with the water into the interior of each substrate particle, thereby enabling subsequent growth of the microorganism, for instance mushroom mycelium, to take place inside each substrate particle as well as on the particle surface.
- a far greater food source is therefore made available for the microorganism than is possible with substrates sterilised by conventional processes.
- sterile substrate produced in accordance with the present invention being relatively dry, can therefore be customised to meet the requirements of the particular microorganism being cultivated in a way which is not possible when the substrate particles are already saturated with water. Indeed, a substrate which would not normally support microorganism growth can be transformed into an attractive environment for a particular species simply by an appropriate formulation of the
- the source of nitrogen and source of Ca 2+ salts which as described above may be added to the substrate material prior to sterilization, may alternatively be introduced into the substrate as part of the recipe of nutrients which is added with the water after sterilization by the process of the invention.
- One advantage of this is that it opens up the possibility of using sources of nitrogen which readily disperse or dissolve in water but are not used in conventional processes because they cannot conveniently be added in a dry form to the substrate material prior to sterilisation.
- Another related advantage of generating a dry sterile substrate by the process of the invention is that the acidity of the microorganism growing environment can be controlled. Different types of microorganism, for instance different mushroom species, require different pH values to flourish, but if the substrate is wet to start with it is very difficult to achieved a particular target pH throughout the bulk of the material. However, if the pH of the water added to the sterile substrate produced by the process of the invention is modified, the pH at the interior of the substrate particles will be correspondingly modified when the water is absorbed.
- a mushroom culture is added to the sterile substrate produced by the process of the invention in the form of a liquid inoculum. In that case the mycelium can be drawn into the interior of the relatively dry substrate particles in the same way as the added water and "recipe" of nutrients, as described above. This promotes subsequent mycelial growth inside the particles of the substrate as well as on their surface.
- the substrate can advantageously further comprise, in addition to the cereal product, a second particulate base material which is porous and capable of preferentially absorbing water.
- Cereal grain is relatively slow at absorbing water, so when water is added to a bag of sterilized dry substrate which comprises cereal grain it is likely to accumulate initially at the bottom of the bag and only be absorbed gradually.
- a disadvantage of this is that the lying water tends to attract contamination. This problem can be alleviated, however, by adding a second porous base material, which has a greater capacity to absorb water than the cereal product, to the substrate at the beginning of the process of the invention.
- This second material absorbs most of the water which is added to the sterile substrate at the time of inoculating the substrate with mushroom culture, and retains the water until it can be absorbed by the cereal product.
- a suitable material for use in this context is vermiculite, which is a super- heated mineral in finely divided form and is a conventional component of potting compost.
- the process of the present invention is particularly applicable to the cultivation of all kinds of mushroom including white mushrooms, gourmet mushrooms and medicinal mushrooms. Examples of the more popular mushrooms include the following: White button mushroom (Agaricus), Shi-itake (L edodes), oyster (Pleurotus), oyster (P. pulmonarius), oyster (P. ostreatus), oyster (P. eryngii), oyster (P. djamor), oyster
- the substrate material to be used in the process of the invention is sawdust obtained from a furniture manufacturer, the sawdust will usually derive from a solid piece of wood which has been seasoned and dried under controlled conditions. The moisture content of the sawdust in percentage by weight terms will therefore be known.
- the substrate material is not already sufficiently dry to start with, or if its moisture content is not known, it must be dried until the moisture content is 30 % by weight throughout or less. In that case the substrate material is preferably dried in an oven until there is no further weight loss, indicating that all the water has been expelled and the material is completely dry.
- the moisture content of a substrate material can be determined by taking a sample and weighing it, drying it in an oven for at least one hour and then re- weighing it.
- the reduction in weight corresponds to the amount of water lost.
- the desired target weight loss for a sample weighing lOOg is 30g or less, indicating that the moisture content of the material has reached 30 % by weight or less.
- the dried substrate material When the dried substrate material is to be exposed to radiation to effect sterilisation it is usually placed within a lining material which resists the ingress of microorganisms, for instance inside a plastic bag.
- a bag may be made of any polymeric material which is stable towards radiation, for instance polyethylene.
- the bags are usually chosen so that their volume is several times bigger than the volume of the contents, so that the bag can be folded and sealed in such a way as to avoid post-sterilisation contamination.
- one or more bags may then be placed for additional protection inside a second bag, which is also folded and sealed.
- the or each bag is then typically placed in a cardboard box. The cardboard box is closed and may then be exposed to radiation. Any form of radiation capable of effecting sterilisation may be used.
- the radiation is electron beam or gamma radiation, but in practice gamma rays are preferred because they achieve a higher degree of penetration of the substrate material.
- a preferred source of gamma rays is Co 60 .
- the dose of radiation is typically from 5 kGy to 100 kGy, for example from 8 kGy to 100 kGy, more preferably from 10 kGy to 100 kGy. In one preferred aspect of the invention the upper limit is 60 kGy.
- the process thus described yield a sterile dry substrate in a sealed bag, which is very convenient for further handling.
- the substrate may, for instance, be wetted and inoculated directly with mushroom culture.
- the process of the invention may thus include the further step of adding water and a mushroom culture to the sterilised substrate.
- the added water may be enriched with a mushroom growth promoting gas such as oxygen, or with one or more minerals, nutrients, enzymes or bacteria which support the growth of mushrooms.
- the shelf-life is almost indefinite so the bags of dry sterile substrate may be stored for future use or transported elsewhere to be inoculated with a mushroom culture.
- the dried substrate is to be exposed to heat, the same procedure is followed as would be used for conventional steam sterilisation.
- the dried substrate is therefore placed in an autoclave or an oven.
- the temperature in the autoclave is typically of the order of 120°C.
- the time required for the heating will depend on the nature of the substrate, for instance its density and its bio-count. Typically the time period is from 5 to 20 hours, more usually from 10 to 20 hours, it being understood that the specific time period must be individually selected depending on not only the nature of the substrate but also the equipment being used for heating.
- the dried substrate When the dried substrate is to be submitted to chemical sterilisation, it may be treated with a chemical such as sodium hypochlorite (bleach) or formaldehyde and subsequently dried. Alternatively the substrate may be treated with a gas or with a mixture of gases. Suitable examples of gases include formalin, ozone and methyl bromide.
- a chemical such as sodium hypochlorite (bleach) or formaldehyde
- the substrate may be treated with a gas or with a mixture of gases. Suitable examples of gases include formalin, ozone and methyl bromide.
- sterile means substantially free, more typically totally free, of all living organisms. It may also mean substantially free of competitor microorganisms. Preferably it means, in accordance with the definition quoted in the introduction above, that the probability that the substrate material contains even one surviving microorganism is infinitesimally small.
- Inoculation of the sterile substrate is typically carried out in a laminar flow cabinet, which is a conventional structure that allows an operator to work in a sterile environment.
- the box is opened and each of the bags inside it is opened.
- a measured amount of mushroom culture, for instance spawn, is then injected into the sterile substrate and shaken. Water is added to achieve a moisture content within the range of 45-50% by weight if the substrate is grain or 65 to 70% by weight if the substrate is other than grain.
- minerals and nutrients may, if desired, be dissolved or dispersed in the water before it is added to the inoculated substrate. Certain bacteria which promote mushroom growth may also be added to the water.
- the mushroom inoculum in liquid form may be added to the water prior to addition of the latter to the dry substrate. In either case, the bag is sealed once the moisture content has reached the desired level.
- the process of the invention as defined above may also be conducted in-line as a continuous process.
- This process is conveniently carried out in a machine which is totally enclosed in concrete in order to provide protection against the radiation used.
- the machine contains a conveyer belt or a screw elevator with an adjacent radiation source, for example a rod of Co 60 .
- the substrate material is dried and then passed along the conveyer belt or screw elevator where it is exposed to radiation from the source.
- the substrate may then be retrieved and bagged.
- a mushroom culture and water with optional added nutrients may be added directly to the sterilised substrate, prior to bagging, as part of the continuous process.
- This latter embodiment has the advantage that intervention by human operators is minimised, thereby reducing the risk of further contamination.
- the radiation dose is related to the speed of the conveyer belt or the screw elevator.
- the present invention further provides a sterile substrate suitable for use in microorganism cultivation, especially mushroom cultivation, which has a moisture content of 30 %.by weight or less and comprises a particulate base material which is capable of absorbing or entrapping water.
- the substrate has a uniform moisture content throughout of 12 % by weight or less.
- the substrate may further comprise a source of nitrogen, for instance a source of nitrogen as described above.
- the invention also provides a sterile substrate suitable for use in microorganism cultivation, especially mushroom cultivation, which has a moisture content throughout of 30 % by weight or less and comprises a cereal product and a second particulate base material which is capable of preferentially absorbing or entrapping water.
- the substrate has a uniform moisture content throughout of 12 % by weight or less.
- the second base material is a porous ceramics material, a water-absorbing mineral or a water absorbing polymer.
- Preferred examples of the second base material include vermiculite and perlite. It is advantageous to seal a sterile substrate of the invention as defined above within a lining material which resists the ingress of microorganisms.
- the sterile substrate of the invention comprises a sterile, dry particulate base material.
- the individual particles of the base material being dry as well as sterile, can readily absorb moisture.
- the substrate is thus particularly well suited to being treated with liquid mushroom culture inoculum.
- liquid inoculum may comprise mushroom mycelium in an enriched liquid suspension.
- the invention accordingly further provides a process for producing a solid- state mushroom, culture inoculum, which process comprises exposing a sterile substrate as of the invention as defined above to a liquid mushroom culture inoculum comprising mushroom mycelium in suspension, such that free liquid is drawn inside the particles of the substrate and the mycelium is disposed on the surface of the particles, and recovering the resulting mycelium-coated particles.
- Example 2 Inoculation of sterile substrate
- the bags were shaken and then water was added to each one until the moisture content was within the range of 65% to 70% by weight. Each bag was then sealed and left to enable the mycelium to grow.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU24465/00A AU2446500A (en) | 1999-02-05 | 2000-02-04 | Sterile substrate and process for producing it |
EP00902720A EP1148890A1 (en) | 1999-02-05 | 2000-02-04 | Sterile substrate and process for producing it |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9902639.5 | 1999-02-05 | ||
GBGB9902639.5A GB9902639D0 (en) | 1999-02-05 | 1999-02-05 | Process for producing a sterile substrate |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000045860A1 true WO2000045860A1 (en) | 2000-08-10 |
Family
ID=10847216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/000340 WO2000045860A1 (en) | 1999-02-05 | 2000-02-04 | Sterile substrate and process for producing it |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1148890A1 (en) |
AU (1) | AU2446500A (en) |
GB (1) | GB9902639D0 (en) |
WO (1) | WO2000045860A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001087045A1 (en) | 2000-05-18 | 2001-11-22 | Mycocell Technologies Limited | Novel mushroom spawn |
AU2013203868B2 (en) * | 2006-10-26 | 2015-07-09 | Xyleco, Inc. | Processing biomass |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1438817A (en) * | 1965-06-28 | 1966-05-13 | Lion Blancs De Semis Le | Support for mycelium cultures of fungi, especially cultivated mushrooms |
US4915606A (en) * | 1987-08-26 | 1990-04-10 | Kabushiki Kaisha Tiyoda Seisakusho | Steam sterilizing apparatus for mushroom culture medium |
-
1999
- 1999-02-05 GB GBGB9902639.5A patent/GB9902639D0/en not_active Ceased
-
2000
- 2000-02-04 WO PCT/GB2000/000340 patent/WO2000045860A1/en not_active Application Discontinuation
- 2000-02-04 AU AU24465/00A patent/AU2446500A/en not_active Abandoned
- 2000-02-04 EP EP00902720A patent/EP1148890A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1438817A (en) * | 1965-06-28 | 1966-05-13 | Lion Blancs De Semis Le | Support for mycelium cultures of fungi, especially cultivated mushrooms |
US4915606A (en) * | 1987-08-26 | 1990-04-10 | Kabushiki Kaisha Tiyoda Seisakusho | Steam sterilizing apparatus for mushroom culture medium |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001087045A1 (en) | 2000-05-18 | 2001-11-22 | Mycocell Technologies Limited | Novel mushroom spawn |
AU2013203868B2 (en) * | 2006-10-26 | 2015-07-09 | Xyleco, Inc. | Processing biomass |
AU2013203863B2 (en) * | 2006-10-26 | 2015-10-15 | Xyleco, Inc. | Processing biomass |
Also Published As
Publication number | Publication date |
---|---|
AU2446500A (en) | 2000-08-25 |
EP1148890A1 (en) | 2001-10-31 |
GB9902639D0 (en) | 1999-03-31 |
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