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    • 专利摘要:
    The present invention pertains to a method for producing a dry fermented feed product comprising the step of providing a fermented feed product, wherein said feed product comprises Iactic acid bacteria, introducing said feed product of into a dryer chamber, contacting said feed product with a stream of drying gas in said dryer chamber, and obtaining a dry fermented feed product. Moreover the present invention pertains to the dry fermented feed product obtainable by the method of the present invention.
    公开号:DK201170489A
    申请号:DKP201170489
    申请日:2011-09-02
    公开日:2013-03-03
    发明作者:Legarth Jens Hoeffner
    申请人:Fermentationexperts As；
    IPC主号:
    专利说明:

    Method of manufacturing a fermented dry feed Technical field of the invention
    The present invention relates to a method for producing a dry fermented feed product. In particular, an improved method for producing a dry fermented feed product comprising high levels of viable lactic acid producing bacteria.
    Background of the invention
    There is a demand in the art for dry fermented feed products having low spoilage (i.e. low levels of pathogenic microorganisms) and improved nutritional value.
    Fungi are the main cause of spoilage of livestock feed, particularly in feed containing legumes. Some fungal species may cause serious disease in livestock consuming the feed by elaborating toxins. Bacterial spoilage may also occur although the problem is in particular in liquid feed.
    Potentially harmful bacteria and organisms are natural inhabitants of soil and vegetation and are accordingly found on feed components and everywhere in the animal's environment. The bacteria and other organisms present will ferment, unless prevented e.g. by sterilization. The fermentation may result in outgrowth of pathogenic bacteria or various types of yeast and molds.
    Providing fermented feed products prepared to contain low levels of pathogenic microorganisms and high levels of probiotic bacteria to growing pigs have been reported to decrease pathogenic microorganisms counts along the gastrointestinal tract.
    Fermented feed containing probiotic bacteria in the form of lactic acid producing bacteria is often delivered to the animals in the form of liquid feed using liquid feeding system. However, it may be preferable to deliver the feed as dry feed for various reasons e.g. certain animals are unable to consume liquid feed.
    Methods for manufacturing dry fermented feed usually involve the use of conventional dryer to remove the moisture of a (semi) liquid feed to obtain a dry feed. Thus, conventional dryers, such as toasters, operate at very high temperatures, severely impairing the viability of the probiotic bacteria in the feed. WO 97/19307 (APV Anhydro A / S) discloses a process and apparatus for drying a material in the form of a paste or a filter cake in a spin flash dryer. The products dried according to WO 97/19307 are fruit and beet pulps, distillers residues, pesticides, pigments, dyes, ceramics, active coal, sludge and zeolites. WO 97/19307 is hereby incorporated by reference.
    Therefore, an improved method for producing a dry fermented feed low in pathogenic microorganisms and having improved nutritional value would be advantageous, and in particular having a high level of probiotic bacteria would be advantageous.
    Summary of the invention
    An object of the present invention relates to the provision of an improved method of manufacturing a dry fermented feed product.
    In particular, it is an object of the present invention to provide an improved method for the production of a dry fermented feed comprising a high level of viable lactic acid bacteria (i.e. probiotic bacteria).
    The present inventors have surprisingly discovered that the method of the present invention allows for the provision of a dry fermented feed which simultaneously comprise low levels of pathogenic microorganisms and high levels of viable lactic acid bacteria (LAB). Using traditional drying techniques, such as toasting, the viability of lactic acid bacteria is significantly decreased (if not completely obliterated) during the process of producing dry fermented feed products —however, the inventor surprisingly discovered a gentle drying process, the viability of the Lactic acid bacteria in the fermented feed (to be dehydrated) is maintained or only slightly decreased.
    Thus, a first aspect of the present invention relates to a method of producing a dry fermented feed product comprising the step of (a) providing a fermented feed product, said feed product comprising lactic acid bacteria, (b) introducing said feed product of (a) into a dryer chamber, (c) contacting said feed product or (a) with a stream of drying gas in said dryer chamber, and (d) obtaining a dry fermented feed product. A second aspect of the present invention relates to the product obtainable by the method of the present invention.
    Detailed description of the invention
    Definitions
    Prior to discussing the present invention in further details, the following terms and conventions will first be defined:
    inoculum
    Inoculation refers to the placement of a microorganism (s) (e.g., lactic acid bacteria) that will grow when implanted in a culture medium. Inoculum refers to the material used in an inoculation, for example a composition comprising a living organism (s), which is employed to prime a process of interest. For example, an inoculum, where the bacteria are essentially lactic acid bacteria, may be used to direct a lactic acid formation process in a culture medium in a fermentation tank comprising said media (e.g., a feed material). Thus, to "inoculate" refers to the transfer of the inoculum to the media to be processed, for example the transfer of the inoculums to a feed material to be fermented. The primary inoculum refers to the generation of the initial inoculum in a repeated series of essentially identical inoculation process, for example one or more repetitions of a fermentation process. An aliquot of the product of the formation process may be used to inoculate a new process of fermentation. Thus, the inoculation may be a fermented feed product comprising viable lactic acid bacteria in sufficient amount to prime a lactic acid fermentation process of another feed product to be fermented. The inoculum may be in a liquid form, dry form, or essentially dry form. The moisture% of the inoculum may be adjusted in order to optimize the fermentation process. Thus, the inoculum used in the method of the present invention may be a fermented feed product. In one embodiment the inoculum is provided as essentially pure viable bacteria (such as bacteria in freeze dried form) or bacteria suspended in a suitable media prior to application (such as a water, buffer or a growth media).
    The proportion of the inoculums added to the feed product may vary. In case it is considered that the load of undesirable microbes is significant in the feed product or the fermentation system, the proportion of the inoculum in the fermentation mixture (inolucum + feed product + additional water) may be increased to insure that the fermentation is directed by the microbes (eg lactic acid bacteria) of the inoculums.
    Lactic acid bacteria
    The class of lactic acid bacteria (or lactic acid producing bacteria) comprise a clade of Gram positive, low-GC, acid tolerant, non-sporulating, non-respiring rod or cocci that are associated with their common metabolic and physiological characteristics. These bacteria, usually found in decomposing plants and lactic products, produce lactic acid as the major metabolic end product of carbohydrate fermentation. This trait has historically linked lactic acid bacteria with food fermentations as acidification inhibits the growth of spoilage agents.
    Proteinaceous bacteriocins are produced by several lactic acid bacteria strains and provide an additional hurdle for spoilage and pathogenic microorganisms. Furthermore, lactic acid and other metabolic products contribute to the organoleptic and textural profile of a food item. The industrial importance of the lactic acid bacteria is further evidenced by their generally considered safe (GRAS) status, due to their ubiquitous appearance in food and their contribution to the healthy microflora of animal mucosal surfaces.
    Lactic acid fermentation
    Lactic acid fermentation is the simplest type of fermentation. Essentially, it's a redox reaction. In anaerobic conditions, the cell's primary mechanism of ATP production is glycolysis. Glycolysis reduces - transfers electrons to - NAD +, forming NADH. However, there is only a limited supply of NAD + available in a cell. For glycolysis to continue, NADH must be oxidized - have electrons taken away - to regenerate the NAD +. This is usually done through an electron transport chain in a process called oxidative phosphorylation; however, this mechanism is not available without oxygen.
    Instead, the NADH donates its extra electrons to the pyruvate molecules formed during glycolysis. Since the NADH has lost electrons, NAD + regenerates and is again available for glycolysis. Lactic acid, for which this process is named, is formed by the reduction of pyruvate.
    A heterolactic acid fermentation, one molecule of pyruvate is converted to lactate; the other is converted to ethanol and carbon dioxide. In homolactic acid fermentation, both molecules of pyruvate are converted to lactate. Homolactic acid fermentation is unique because it is one of the only respiration processes not to produce a gas as a byproduct.
    Homolactic fermentation breaks down the pyruvate into lactate. It occurs in the muscles of animals when they need energy faster than the blood can supply oxygen. It also occurs in some kinds of bacteria (such as lactobacilli) and some fungi. It is this type of bacteria that converts lactose into lactic acid in yogurt, giving it its sour taste. These lactic acid bacteria can be classified as homofermentative, where the end product is mostly lactate, or heterofermentative, where some lactate is further metabolized and results in carbon dioxide, acetate or other metabolic products.
    The process of lactic acid fermentation using glucose is summarized below. In a homolactic fermentation, one molecule of glucose is converted to two molecules of lactic acid: C6H1206 - + 2 CH3CHOHCOOH.
    In a heterolactic fermentation, the reaction proceeds as follows, with one molecule of glucose being converted to one molecule of lactic acid, one molecule of ethanol, and one molecule of carbon dioxide: C6H1206 CH3CHOHCOOH + C2H50H + C02
    Before lactic acid fermentation can occur, the molecule of glucose must be split into two molecules of pyruvate. This process is called glycolysis.
    It is preferred that the dry fermented feed of present invention be obtained by lactic acid fermentation. It is also preferred that the fermentation is homolactic fermentation directed by homofermentative lactic acid bacteria.
    Feed material
    The term "feed material" according to the invention is understood in its broadest sense. "Feed material" may be suitably obtained from the dairy industry, food processing industry, the agricultural industry, the wine industry, the alcohol industry, or beer industry, or combinations thereof. Examples of suitable "feed material" comprise one or more mature and / or immature plants and parts thereof, such cereals, e.g. wheat, barley, rye, rice, maize (cob maize silage (CCM) or ripe), triticale, oat; vegetables (e.g. potatoes, maize, soy; whey, curd, skim milk and the like). The feed to be fermented may also consist essentially of a composition of one or more of proteinaceous plant materials. The feed material to be fermented may include animal products such as industrial animal by-products such as blood meal and bone meal. Another non-limiting example of a useful animal product is mussels.
    The terms "fermented product" or "fermented feed" indicate any product or feed that has been fermented.
    In the context of the present invention, the terms "dry fermented product" or "dry fermented feed product" refers to a dry product or dry feed product obtained by reducing the moisture content of a fermented product or fermented feed product to obtain a dry fermented feed. product.
    Bacterial viability
    Bacterial viability is to be understood as is the ability of bacteria to survive, grow, and multiply. Bacterial viability can be measured using any known method in the art such as but not limited to (i) measurement of colony forming units (CFU), (ii) staining using e.g. probes for membrane integrity or physiological state and (iii) amplification techniques such as PCR and RT-PCR.
    Per Cent Moisture (% moisture, or% H20)
    Per cent Moisture refers to the proportion of water in the material (e.g. in the feed). Volumetric water content, Θ (or vol%), is defined mathematically as: Θ = Vw / VT, where Vw is the volume of water and VT = Vs + Vv = Vs + Vw + Va is the total volume (which is material Volume + Water Volume + Void Space). Water content may also be based on its mass or weight (w / w%), thus the gravimetric water content is defined as: u = mw / nrib, where mw is the mass of water and mb (or ms for soil) is the bulk material mass. To convert gravimetric water content to volumetric water, multiply the gravimetric water content by the bulk specific gravity of the material.
    Method of producing a dry fermented feed product
    One aspect of the present invention relates to a method of producing a dry fermented feed product, comprising the steps of: (a) providing a fermented feed product, said feed product comprising lactic acid bacteria; (b) introducing said feed product or (a) into a dryer chamber; (c) contacting said feed product or (a) with a stream of drying gas in said dryer chamber, and (d) obtaining a dry fermented feed product.
    In one embodiment, the method comprises the steps of: (a) providing a fermented feed product, said feed product comprising lactic acid bacteria by (i) providing an inoculum comprising bacteria, (ii) providing a feed material; (iii) combining the materials of steps (i), (i) and fermenting the feed material of step (ii) using the inoculum of step (i) to obtain said fermented feed product; (b) introducing said fermented feed product or (a) into a dryer chamber; (c) contacting said fermented feed product or (a) with a stream of drying gas in said dryer chamber, and (d) obtaining a dry fermented feed product.
    The moisture content of the product obtained in step (d) can be controlled by adjusting the amount of fermented feed product feed to said dryer chamber in step (b) and / or adjusting the drying capacity of said drying gas.
    In order to obtain sufficient dehydration of the fermented feed product provided in step (a) it may be preferred that the moisture content of the excess drying gas is 0.4 kg moisture per kilogram dry gas or higher, such as 0.5 kg moisture per kilogram dry gas or higher, eg 0.6 kg moisture per kilogram of dry gas or higher.
    Thus, typically the moisture is evaporated at a rate in the range of 600 to 900 kg of moisture per hour, such as 650 to 850 kg of moisture per hour, e.g. 700 to 800 kg of moisture per hour, preferably 725 to 775 kg of moisture per hour. Most preferably the moisture is evaporated at a rate of 735kg / h or around 735kg / h.
    In an embodiment, the flow rate at which the drying gas flows through the drying chamber is in the range of 30000 to 40000 m3 drying gas per hour, such as in the range of 31000 to 39000 m3 drying gas per hour, e.g. in the range of 32000 to 38000 m3 drying gas per hour, such as in the range of 33000 to 37000 m3 drying gas per hour, e.g. in the range of 34000 to 36000 m3 drying gas per hour, such as in the range of 35000 to 35500 m3 drying gas per hour, preferably in the range of 33500 to 34500 m3 drying gas per hour. In a preferred embodiment, the flow rate at which the drying gas flows through the drying chamber is 34000 m3 drying gas per hour or around 34000 m3 drying gas.
    The term drying gas is to be understood in its broadest context, thus the term covers any gas including air applicable to drying. From a financial point of view it may be preferred that the drying gas is air. In a preferred embodiment the drying gas is hot air. Air is mainly composed of nitrogen, oxygen, and argon, which together constitute the major gases of the atmosphere.
    Thus, preferably the inlet temperature of the drying gas is in the range of 120 to 250, such as 160 to 220 or 120 to 160 ° C, such as in the range of 125 to 155 ° C, such as in the range of 130 to 150 ° C, e.g. in the range from 135 to 145 ° C, such as in the range from 140 to 160 ° C. In a preferred embodiment the inlet temperature of the drying gas is in the range of 135 to 145 ° C.
    Clearly, it is important to use an inlet temperature of the drying gas which simultaneously (i) provides sufficient dehydration of the fermented feed product provided in step (a) and (ii) retain viable lactic acid bacteria obtained in the dry fermented feed product in step (d).
    If the inlet temperature of the drying gas affects the temperature of the dry fermented feed product obtained in step (d) it may be preferred that the temperature of the product obtained in step (d) is the range of or does not exceed 40 to 75 ° C, such as 40 to 60 ° C or 60 to 75 ° C, such as in the range of 65 to 70 ° C, e.g. in the range from 66 to 69 ° C, such as in the range from 67 to 68 ° C, preferably measured at the out let of the drying chamber.
    In a preferred embodiment, the temperature of the product obtained in step (d) is the range of or does not exceed 40 to 60 ° C, preferably measured at the out of the drying chamber.
    In one embodiment, the drying chamber of a spin flash dryer. Traditionally such drying chamber has been used for drying fruit and beet pulps, distillers residues, pesticides, pigments, dyes, ceramics, active coal, sludge and zeolites. The present inventors surprisingly discovered that such drying chamber can be used for a process of dehydrating fermented feed containing probiotic bacteria as provided with the present invention - i.e. a process where the viability of the lactic acid bacteria in the dry fermented feed product is maintained or only slightly decreased when compared to the fermented feed product from which it is derived.
    In the case of operation of a spin flash dryer, the drying gas creates a high velocity, whirling a fluidized bed of drying particles which moves up through the chamber during the process. Heavy, still wet lumps are forced towards the chamber walls. Disintegration, attrition and drying cause particles to become smaller and lighter and, as a consequence, a balanced fluid bed is created in which smaller particles move towards the axis of the drying chamber. DK 2011 70489 A1 10
    By selecting operating conditions, a state of equilibrium is obtained in which the feed rate of moist is in balance with the corresponding drying capacity (a principle known to the skilled person in the art of drying) and with the discharge rate of the dries product . It is a special effect of the spin flash dryer that the particles remain in the drying zone until they obtain the desired size.
    In order to prevent spoilage of the dry fermented feed product it is important that the moisture content is kept low. Thus, in a preferred embodiment, the moisture content of the dry fermented feed product obtained in step (d) is in the range of 2 to 15 w / w%, such as in the range of 3 to 14 w / w%, e.g. in the range of 4 to 13 w / w%, such as in the range of 5 to 12 w / w%, such as in the range of 6 to 11 w / w%, e.g. in the range of 7 to 10 w / w%, such as in the range of 8 to 9 w / w%, such as in the range of 5 to 15 w / w%. In a preferred embodiment, the moisture content of the dry fermented feed product obtained in step (d) is 11 w / w% or around 11 w / w%.
    The drying efficiency is affected by the consistency of the fermented feed provided in step (a). Thus, it is preferred that such fermented feed is either liquid or semisolid (such as a paste or a filter cake). Thus, in one embodiment, the moisture content of the feed provided in step (a) is in the range of 25 to 95 w / w%, such as in the range of 30 to 90 w / w%, e.g. in the range of 35 to 85 w / w%, such as in the range of 40 to 80 w / w%, e.g. in the range of 45 to 75 w / w%, such as in the range of 50 to 70 w / w%, e.g. in the range of 55 to 65 w / w%, such as in the range of 40 to 60 w / w%.
    Lactic acid bacteria
    It follows that the lactic acid bacteria provided with the fermented feed of step (a) is essentially or for the most part viable since the object is to provide a dry feed comprising high amount of viable (probiotic) lactic acid bacteria. As previously mentioned, the inventor surprisingly found that high levels of viable lactic acid bacteria present in the fermented feed provided in step (a) can be retained in the dry fermented feed product obtained in step (d) by using the method of the present invention. Lactic acid bacteria are probiotic organisms - i.e. organisms which when administered in adequate amounts confer a health benefit on the host (i.e. the animal consuming them). Thus, using a dry fermented feed product containing high levels of viable lactic acid bacteria may provide significant benefits in terms of improved health and improved growth of the animals consuming them. Clearly, the nutritional value of the dry fermented feed product is maintained and the probiotic property of the feed is improved when compared to traditionally produced dry fermented feed products, such as a dry feed obtained by toasting a fermented (semi) liquid feed.
    All types of lactic acid bacteria may be present in the fermented feed provided in step (a). However, in a preferred embodiment the lactic acid bacteria comprises at least one bacteria genus selected from the list consisting of Enterococcus, Lactobacillus, Pediococcus and Lactococcus.
    In a further embodiment, the lactic acid bacteria comprises at least one species selected from the list consisting of Enterococcus spp., Lactobacillus spp., Lactococcus spp., And Pediococcus spp.
    In yet another embodiment of the method according to any of the preceding claims, said lactic acid bacteria comprises at least one species selected from the list consisting of Enterococcus faecium, Lactobacillus rhamnosus, Lactobacillus plantarum, Pediococcus acidililactili, and Pediococcus pentosaceus.
    The inventor surprisingly discovered that a dry fermented feed containing viable lactic acid producing bacteria may be obtained by briefly exposing the feed to a hot drying gas (such as in a spin flash dryer). Although the bacteria are exposed to drying gas having a high temperature, the viability of the bacteria is less affected than by conventional drying processes such as toasting (See Example 1).
    By using the method of the present invention 60 to 100% such as 80-100% of the viable lactic acid bacteria present in the fermented feed provided in step (a) may be retained in the dry fermented feed product obtained in step (d) , such as 81-99%, e.g. 82-98%, such as 83-97%, e.g. 84-96%, such as 85-95%, e.g. 86-94%, such as 87-93%, e.g. 88-92%, such as 89-91%, e.g. 90-99%.
    The fermented feed product
    Probiotics such as lactic acid bacteria are commonly consumed as part of fermented feed - thus, the fermented feed product provided in step (a) may be obtained essentially by homo-fermentative fermentation. "Essentially homofermentative" means that the predominant bacterial flora driving the fermentation is homofermentative. In one embodiment, 99% or more of the bacteria are homofermentative. In another embodiment of the invention, 95% or more of the bacteria are homofermentative. In yet another embodiment, 90% or more of the bacteria are homofermentative. In one embodiment, 80% or more of the bacteria are homofermentative In yet another embodiment, 70% or more of the bacteria are homofermentative. "Essentially homofermentative" also indicates that the major fermentation product is lactic acid, and the levels of acetic acid and ethanol are either below taste threshold, around taste threshold or slightly above taste threshold. Alternatively, "essentially homofermentative" indicates a ratio of lactic acid to acetic acid or lactic acid to ethanol (mM / mM) of 7: 1 or 10: 1 or more, 20: 1 or more, 50: 1 or more, or 100 : 1 or more. In an embodiment, the ratio of lactic acid to acetic acid or lactic acid to ethanol (mM / mM) may be 1: 1.
    In another embodiment of the present invention the fermented feed product in step (a) is obtained essentially by hetero-fermentative fermentation. "Essentially heterofermentative" means that the predominant bacterial flora driving the fermentation is heterofermentative. In one embodiment, 99% or more of the bacteria are heterofermentative. In another embodiment of the invention, 95% or more of the bacteria are heterofermentative. In yet another embodiment, 90% or more of the bacteria are heterofermentative. In one embodiment, 80% or more of the bacteria are heterofermentative In yet another embodiment, 70% or more of the bacteria are heterofermentative. "Essentially heterofermentative" also indicates that the major fermentation product is acetic acid, and the levels of lactic acid are either below taste threshold, around taste threshold or slightly above taste threshold. Alternatively, "essentially heterofermentative" indicates a ratio of acetic acid to lactic acid (mM / mM) of 7: 1 or 10: 1 or more, 20: 1 or more, 50: 1 or more, or 100: 1 or more. In an embodiment, the ratio of lactic acid to acetic acid or lactic acid to ethanol (mM / mM) may be 1: 1.
    As mentioned previously, the difference between homo- and heterofermentation is essentially the class of bacteria performing the fermentation.
    These lactic acid bacteria can be classified as homofermentative, where the end product is mostly lactate, or heterofermentative, where some lactate is further metabolized and results in carbon dioxide, acetate or other metabolic products.
    In order to prevent spoilage of the fermented feed product provided in step (a) it may be preferred that the fermented feed product provided in step (a) has a pH between 3.5 and 5, such as between 3.6 and 4.9, e.g. between 3.7 and 4.8, such as between 3.8 and 4.7, e.g. between 3.9 and 4.6, such as between 4.0 and 4.5, e.g. between 4.1 and 4.4, such as between 4.2 and 4.3, e.g. between 3.7 and 3.9. In a preferred embodiment the pH is around 3.8.
    In addition to preventing spoilage, the acidic components produced also contribute to the organoleptic and textural profile of the fermented feed product provided in step (a) thus also affecting the organoleptic and textural profile of the dry fermented feed product obtained in step (d).
    Lactic acid bacteria produce lactic acid during fermentation of a fermentable carbon source, which results in acidification of the environment. Depending on the starter culture or starter cultures used, as well as on the availability of fermentable sugar (s), thus the lactic acid concentration of the fermented feed product in step (a) may vary.
    Thus, if the fermented feed product provided in step (a) has been obtained essentially by homo-fermentative fermentation, it may be preferred that the fermented feed product provided in step (a) has a lactic acid concentration in the range of 50-100. mM, such as 100-150 mM, eg 150-200 mM, such as 200-250 mM, e.g. 250-300 mM, or 300 mM or more.
    If the fermented feed product provided in step (a) has been obtained essentially by hetero-fermentative fermentation, it may be preferred that the fermented feed product provided in step (a) has an ecetic concentration in the range of 50-100 mM, such than 100-150 mM, e.g. 150-200 mM, such as 200-250 mM, e.g. 250-300 mM, or 300 mM or more.
    The fermentation should be continued until reaching a desired pH thus, fermentation may be continued up to 6 weeks, such as 4 weeks, such as 3 weeks, such as 2 weeks, e.g. 1 week. In a preferred embodiment of fermentation the fermentation product provided in step (a) has been fermented for 12-24 hours, e.g. 8-12 hours, such as 6-8 hours, e.g. 4-6 hours, or less than 4 hours.
    In an embodiment the fermented feed product provided in step (a) has been fermented at a temperature between 10-50 ° C, 15-40 ° C, 18-30 ° C, 20-25 ° C, or 22-24 ° C or around 23 ° C.
    In an embodiment of the present invention the fermented feed provided in step (a) is obtained by fermenting one or more industrial products. Such industrial products may be by-product such as one or more of whey, curd, spent grain, yeast, fungus, bacteria, plants or parts thereof, potato or parts thereof.
    The fermented feed provided in step (a) may sometimes comprise one or more of ripe or unripe plants or parts thereof. Accordingly, the fermented feed provided in step (a) comprises one or more of barley, wheat, rye, oat, maize, rice, beans, peas, sorghum, triticale, soy, rape or other proteinous plant material. If the plant is maize the fermented feed provided in step (a) may thus comprise grain maize and corn cob mix (CCM maize).
    inoculum
    In a further embodiment, the pH of the inoculum is between 3.5 and 5, such as between 3.6 and 4.9, e.g. between 3.7 and 4.8, such as between 3.8 and 4.7, e.g. between 3.9 and 4.6, such as between 4.0 and 4.5, e.g. between 4.1 and 4.4, such as between 4.2 and 4.3, e.g. between 3.7 and 3.9.
    The lactic acid concentration in the inoculum for the fermentation in step (a) can be higher than the lactic acid concentration in the fermented feed obtained in step (a).
    The lactic acid concentration in the inoculum for the fermentation in step (a) can be higher than the lactic acid concentration in the fermented feed obtained by the fermentation in step (a). In another embodiment of the invention, the lactic acid concentration in the fermented feed obtained by the fermentation in step (a) is higher than in the inoculum. In a further embodiment, the lactic acid concentrations of inoculum and fermented product are approximately the same.
    Preferably the inoculum is obtained essentially by homo-fermentative or hetero-fermentative fermentation - thus, the fermentation is driven and controlled by lactic acid bacteria as the most predominant fermentative organisms.
    The inoculum used for the fermentation of the feed material preferably comprises lactic acid producing bacteria. According to one embodiment, said inoculum preferably comprises lactic acid bacteria.
    Thus, in another embodiment of the present invention, the inoculum comprises lactic acid bacteria selected from the group consisting of one or more Enterococcus spp., Lactobacillus spp., Lactococcus spp., And Pediococcus spp.
    In yet another embodiment the inoculum comprises has been obtained by fermentation with an inoculum comprising lactic acid bacteria selected from the group consisting of one or more Enterococcus spp., Lactobacillus spp., Lactococcus spp., And Pediococcus spp.
    In a further embodiment the inoculum comprises has been obtained by fermentation with an inoculum comprising lactic acid bacteria selected from the group consisting of one or more of Enterococcus faecium, Lactobacillus rhamnosus, Lactobacillus plantarum, Pediococcus acidililactili, and Pediococcus pentosaceus.
    Most yeasts and molds are indeed able to grow under very acetic conditions, however, it has been recognized that rapid and efficient production of lactic acid by the lactic acid-producing bacteria cause very reduced or even eliminated growth of such yeasts and molds. It follows that the inoculum preferably comprises lactic acid-producing bacteria in sufficient amount to control the fermentation process in order to obtain a feed, which is a product of lactic acid fermentation. Accordingly, lactic acid-producing bacteria with the inoculums in amount sufficient to outgrow bacteria, yeast or molds present in the feed material present in the feed material to be fermented. Thus, in one embodiment, the bacteria present in the inoculum of step (a) are essentially lactic acid-producing bacteria and where the concentration of lactic acid-producing bacteria in the inoculum of step (a) is sufficient to outgrow any bacteria, yeast or molds present in the feed material of step (ii) or at least significantly inhibit further proliferation of said bacteria, yeast or molds.
    Dry fermented feed product
    The present invention further provides a dry fermented feed product obtained / obtainable by the method of the present invention.
    The dry fermented feed product obtained / obtainable by the method of the present invention may be mixed with other dry fermented feed products such as a dry fermented feed product obtained by the method of the present invention using different fermented feed products as the starting material.
    It should be noted that embodiments and features described in the context of one of the aspects of the present invention also apply to the other aspects of the invention.
    All patent and non-patent references cited in the present application are hereby incorporated by reference in their entirety.
    The invention will now be described in further detail in the following non-limiting examples.
    Examples
    Example 1
    Fermented feed containing large amounts of lactic acid producing bacteria was obtained by providing an inoculum comprising lactic acid producing bacteria and mixing the inoculum with a feed material (including rape) and fermenting the mixture to obtain a fermented feed (liquid feed). Samples of the fermented feed were subjected to spin flash drying and conventional drying in the form of toasting, respectively. The counts of viable bacteria in the feed were measured. The data are presented in table 1 below:
    The above data demonstrate that lactic acid producing bacteria in fermented feed are sensitive to the drying method applied to produce dry fermented feed from (semi) liquid feed. The data surprisingly demonstrate that spin flash drying may be successfully applied in order to obtain a dry fermented feed with a high count of viable lactic acids producing bacteria.
    References WO 97/19307 (APV Anhydro A / S)
    权利要求:
    Claims (10)
    [1] 1. A method for producing a dry fermented feed product comprising the step of: (a) providing a fermented feed product, wherein said feed product comprises lactic acid bacteria; (b) introducing said feed product of (a) into a dryer chamber; (c) contacting said feed product of (a) with a stream of drying gas in said dryer chamber, and (d) obtaining a dry fermented feed product.
    [2] 2. The method according to claim 1 comprising the steps of: (a) providing a fermented feed product, wherein said feed product comprises lactic acid bacteria by (i) providing an inoculum comprising bacteria, (ii) providing a feed material; (iii) combining the materials of steps (i), (ii) and fermenting the feed material of step (ii) using the inoculum of step (i) to obtain said fermented feed product; (b) introducing said fermented feed product of (a) into a dryer chamber; (c) contacting said fermented feed product of (a) with a stream of drying gas in said dryer chamber , and (d) obtaining a dry fermented feed product.
    [3] 3. The method of claim 1 or 2 further comprising controlling the moisture content of the product obtained in step (d) by adjusting the amount of feed product to said dryer chamber in step (b) and/or adjusting the drying capacity of said drying gas.
    [4] 4. The method according to any of the preceding claims, wherein moisture content of the excess drying gas is 0.4 kg moisture per kilogram dry gas or higher.
    [5] 5. The method according to any of the preceding claims, wherein said moisture in is evaporated at a rate in the range of 600 to 900 kg moisture per hour.
    [6] 6. The method according to any of the preceding claims, wherein the inlet temperature of said drying gas is in the range of 120 to 160 °C.
    [7] 7. The method according to any of the preceding claims, wherein the temperature of the product obtained in step (d) the range of 40 to 60 °C.
    [8] 8. The method according to any of the preceding claims, wherein said drying chamber is the drying chamber of a spin flash dryer.
    [9] 9. The method according to any of the preceding claims, wherein the moisture content of the feed product obtained in step (d) is in the range of 10 to 15%.
    [10] 10. The method according to any of the preceding claims, wherein the moisture content of the feed provided in step (a) is in the range of 25 to 95%.
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    同族专利:
    公开号 | 公开日
    DK177482B1|2013-07-08|
    WO2013029632A1|2013-03-07|
    引用文献:
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    JP2021534745A|2018-08-20|2021-12-16|ファームバイオティクス ホールディング エーピーエス|Improved human food|
    BR112021002969A2|2018-08-20|2021-06-22|Fermentationexperts A/S|animal feed product and use of an animal feed product|
    US20220023361A1|2018-09-19|2022-01-27|Fermentationexperts A/S|Composition against resistant organisms |
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DK201170489|2011-09-02|
    DKPA201170489A|DK177482B1|2011-09-02|2011-09-02|Method of manufacturing a fermented dry feed using a spin flash dryer|DKPA201170489A| DK177482B1|2011-09-02|2011-09-02|Method of manufacturing a fermented dry feed using a spin flash dryer|
    PCT/DK2012/050328| WO2013029632A1|2011-09-02|2012-09-03|Method of manufacturing a fermented dry feed|
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