JP2012206999A - Method for producing odorless collagen, and the odorless collagen obtained thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing odorless collagen from which an odor component is extracted and removed without damaging the triple helix structure of collagen, and the odorless collagen obtained thereby.SOLUTION: Dried collagen 3 is immersed into carbon dioxide in a liquid state or in a supercritical state, which does not contain an organic solvent, at the inside of a cleaning tank 1 whose inside temperature lies in the range of 0 to 40°C for 5 to 60 min, and an odor component included in the dried collagen 3 is extracted and removed.

Description

  The present invention relates to a method for producing non-brominated collagen from which odor components contained in collagen are extracted and removed without impairing the triple helical structure of the collagen, and to the non-brominated collagen obtained thereby.

  Collagen is abundantly contained in living bones, dermis, tendons, fascia, scales, scales, etc., and is an indispensable substance for living organisms, and therefore has excellent biocompatibility. For this reason, collagen is widely used in beauty, health, medical products and the like. Such collagen generally has three polypeptide chains with a molecular weight of about 100,000 wound around each other to form a right-handed triple helix structure (collagen helix structure), which has a length of about 300 nm and a diameter of about 1. It is in the form of a 5 nm rod-like molecule.

  The above collagen is usually extracted by neutral salt solution, acid salt solution, alkali treatment, etc. on biological bones, etc., subjected to degreasing treatment or solubilization treatment using an enzyme, etc., followed by salting out, centrifugation, Purification such as dialysis and ultrafiltration is performed. However, it is very difficult to completely remove the odor components derived from the organisms that are the origin, and collagen remains because of trace amounts of odor components (oils and fats, water-soluble substances, organic substances, etc.) that remain even after purification. Has a biological odor. Among them, collagen made from fish tends to produce a slight fishy odor even when highly purified.

  As a method for reducing the odor of collagen using fish as a raw material, a method of pretreating the raw fish skin using an organic solvent, a surfactant, an oxidizing agent, or the like is generally known. As this pretreatment, for example, Patent Document 1 discloses a method in which the raw fish skin is repeatedly washed with alcohol and centrifuged. A method of repeatedly performing alcohol washing and centrifugation as in the above pretreatment is one of the common methods used industrially at present. However, there are drawbacks that the work process is complicated and collagen loss occurs due to repeated washing and separation.

  Further, Patent Document 2 discloses a pretreatment method in which fish skin is lime picked in the presence of a surfactant, then the epidermis is peeled, and further, decalcification and enzyme treatment are performed. Patent Document 3 discloses a pretreatment method that suppresses swelling of the collagen tissue by immersing the fish skin in an organic solvent or the like, and removes the color and odor of the fish skin by acting an oxidizing agent under alkaline conditions. Has been. However, in the methods of Patent Document 2 and Patent Document 3, although odor can be obtained to some extent, lime, organic solvents, etc. used in the treatment process are likely to remain in collagen, and thus are not suitable for purification of collagen used in cosmetics, foods, and the like. There is a problem.

  On the other hand, Patent Document 4 discloses a method of removing fat in gelatin using supercritical carbon dioxide as a method for highly purifying gelatin derived from fish skin. Patent Document 5 discloses a method of removing odor components contained in gelatin, protein hydrolyzate, and the like using supercritical carbon dioxide. However, Patent Document 4 and Patent Document 5 both target proteins with relatively low molecular weights such as gelatin and protein hydrolysates, and target collagens having a large molecular weight and a triple helical structure. It is not something to do. In other words, gelatin is mainly composed of a peptide chain in which the triple helix structure of collagen is unwound by heat denaturation, and the protein hydrolyzate is a denatured collagen or gelatin that has been denatured. It does not have such a high degree of three-dimensional structure.

JP 2000-256398 A JP 2003-301144 A JP 2006-213624 A Japanese Patent Laid-Open No. 10-276680 JP-A-6-279229

  The present invention has been made in view of such circumstances, and a method for producing a non-brominated collagen in which an odorous component contained in collagen is removed while maintaining a triple helical structure of collagen, and an odorless product obtained thereby. The purpose is to provide modified collagen.

  In order to achieve the above object, the present invention comprises a step of preparing dry collagen obtained by drying collagen, and the dry collagen is removed from the organic solvent in an enclosed space having an internal temperature in the range of 0 ° C to 40 ° C. The first gist is a method for producing non-brominated collagen, which comprises a step of immersing in carbon dioxide in a liquid state or supercritical state for 5 minutes to 60 minutes to extract and remove odor components contained in the dried collagen. Further, 1-octen-3-ol is a non-brominated collagen obtained by the production method according to the first aspect, and is released as a component released when the non-brominated collagen is heated at 60 ° C. for 15 minutes. Non-brominated collagen that is not detected by measurement in chromatography is a second summary, and is a non-brominated collagen obtained by the method of the first summary, which is released when the non-brominated collagen is heated at 60 ° C. for 15 minutes. As a component to be obtained, at least one selected from the group consisting of pentan-2-one, 1-penten-3-ol and 2,3-pentanedione is a third non-brominated collagen which is not detected by measurement in gas chromatography. The gist of

  That is, the present inventors have intensively studied to solve the above problems. In the course of the research, in order to efficiently remove the odorous components contained in collagen, carbon dioxide is brought into a liquid or supercritical state, and this is brought into contact with the collagen to extract and remove the odorous components contained in the collagen. In addition, since pre-treatment with an organic solvent or lime, which has been conventionally performed to remove odorous components, is not required, residues such as organic solvent and lime do not remain in the collagen, and high-quality collagen can be obtained. I recalled that it might be, and further research. As a result, a collagen triple helix is obtained by immersing dry collagen obtained by drying raw collagen at a low temperature of 40 ° C. or less in a liquid or supercritical carbon dioxide containing no organic solvent for 5 to 60 minutes. The inventors have found that the odor components contained therein can be extracted and removed without destroying the structure, and have reached the present invention. In particular, even if the liquid or supercritical carbon dioxide used in the extraction and removal step remains in the collagen of the present invention, these carbon dioxides are easily released as gases if they are returned to normal pressure. Therefore, there is an advantage that no solvent or the like in the extraction and removal process remains in the collagen.

  As described above, the method for producing a bromide-free collagen of the present invention is a method in which dry collagen is converted into a liquid state or a supercritical state carbon dioxide containing no organic solvent in a sealed space having an internal temperature in the range of 0 ° C to 40 ° C. It is soaked for minutes to 60 minutes to extract and remove odor components contained in the dried collagen. Therefore, since the odor component contained in the dry collagen is extracted and removed at a low temperature and in a short time, the collagen is not easily denatured and can maintain its quality. The liquid carbon dioxide or supercritical carbon dioxide can sufficiently extract and remove the odor component of collagen without adding an organic solvent. . Moreover, since the organic solvent is not added in this way, the organic solvent does not remain inside the collagen, and high-quality collagen with high purity can be produced. In addition, carbon dioxide in a liquid state or supercritical state is used for extracting and removing the odor component of collagen, and even if these remain in the interior, if they are returned to normal pressure, they become gas and easily escape. There is no loss of quality.

  In particular, in the step of extracting and removing the odorous component, when the dried collagen is immersed in a liquid or supercritical carbon dioxide packaged in a sterilization packaging material, the extraction and removal of the odorous component of the collagen and sterilization are performed simultaneously. It is efficient because it can be done. Further, since the collagen can be prevented from scattering when the sealed space is returned to normal pressure after extracting and removing the odor component of collagen, it can be recovered without loss.

In addition, if the dry collagen is derived from fish, it is possible to remove almost all odor components that generate so-called fishy odor, and the obtained collagen can be handled in the same manner as collagen derived from cattle, pigs, etc. Become. In addition, there is no risk of mad cow disease, foot-and-mouth disease, viral infection, etc., and safety is high.

  Further, as a component released when the non-brominated collagen obtained by the production method of the first aspect is heated at 60 ° C. for 15 minutes, 1-octen-3-ol is obtained by measurement in gas chromatography. If it is not detected, there is no fish-like unpleasant odor, so it can be added more to foods and cosmetics.

  In addition, as a component released when the non-brominated collagen obtained by the production method of the first aspect is heated at 60 ° C. for 15 minutes, pentan-2-one, 1-penten-3-ol and 2 Even when at least one selected from the group consisting of 1,3-pentanedione is not detected by gas chromatography measurement, it does not have an unpleasant so-called fishy odor, so it is incorporated more in foods and cosmetics. It becomes possible to do.

  Furthermore, when the non-bromide collagen obtained by the production method of the first aspect is in a sterilized state, it can be used as it is as a raw material for foods, cosmetics and the like, so it is convenient.

It is explanatory drawing of the process of preparing the dry collagen used for one embodiment of this invention. It is a schematic explanatory drawing of the apparatus used for one embodiment of this invention. It is the chromatogram at the time of measuring the Example and comparative example of this invention with a gas chromatography. It is the elements on larger scale of the said chromatogram. It is the peak area area figure which computed the area area of each peak in the said chromatogram. It is a peak area area total figure which showed the sum total of the said peak area area.

  Next, an embodiment for carrying out the present invention will be described. However, the present invention is not limited to this embodiment.

  Of the present invention, the collagen production method according to one embodiment described below is summarized as follows: a dry collagen is prepared, and the dry collagen is immersed in a liquid carbon dioxide gas containing no organic solvent and at a low temperature for a short period of time. Is extracted and removed. Hereinafter, the manufacturing method of the non-bromide collagen which is one Embodiment using the collagen derived from a salmon is demonstrated.

<Preparation of dry collagen>
Processes (A) to (E) shown in FIG. 1 are performed to extract collagen from salmon fish skin to obtain dry collagen. Hereinafter, these steps will be briefly described for each step.

(A) Washing First, prepare a salmon fish skin from which unnecessary parts for collagen extraction such as scales, fins, and the body under the dermis layer have been removed. And the prepared fish skin is wash | cleaned using washing | cleaning liquids, such as purified water or an organic solvent (for example, chloroform, methanol, these liquid mixture). This washing can remove lipids and remaining scales on the surface of the fish skin. Washing is performed, for example, by immersing the prepared fish skin in the cleaning solution and then stirring it. This washing may be repeated twice or more if necessary.

(B) Insolubilization process About the wash | cleaned fish skin, the part (pigment layer side part of a dermis layer) containing the pigment cell of an epidermis layer and a dermis layer is insolubilized. This “insolubilization treatment” refers to the modification of the protein that constitutes the portion of the skin layer of the fish skin and the pigment cells of the dermis layer (the portion of the dermis layer on the epidermis layer side). When immersed in an acid, it refers to a treatment to cure these parts so that they do not swell or dissolve. That is, when this insolubilization treatment is carried out, as will be described later, even when the fish skin is immersed in an organic acid or the like, the portion containing pigment cells in the epidermis layer and the dermis layer (the portion on the epidermis layer side of the dermis layer) swells. do not do. Therefore, by collecting the swollen and thickened portion that has not been insolubilized, the portion of the dermis layer that does not contain pigment cells can be easily obtained. Such an insolubilization process can be performed by immersing the part to be insolubilized in, for example, an aqueous solution of salty powder (calcium, chlorolime), an aqueous solution of sodium hydroxide or an aqueous solution of calcium hydroxide. Especially, it is preferable to immerse the part to be insolubilized for 15 to 45 minutes (depending on the type of fish, its size, etc.) in the aqueous solution of salt powder. In this case, the insolubilization treatment and the sterilization treatment can be performed at the same time, which is efficient.

(C) Swelling The insolubilized fish skin is immersed in an acid such as an organic acid (for example, acetic acid or citric acid) to swell the portion of the dermis layer that has not been insolubilized. As a result, the combined thickness of the epidermis layer and the dermis layer having a thickness of only about 1 to 5 mm swells to a thickness of about 5 to 15 mm. Therefore, the swollen dermis layer portion and other portions can be easily separated. The immersion time for the swelling is preferably 2 to 3 days, although it varies depending on the fish species and the size thereof. Moreover, it is preferable that swelling of the dermis layer of the part which has not been insolubilized is performed so that the thickness after swelling becomes 115 to 125% of the thickness before swelling.

(D) Recovery The swollen dermis layer is separated and recovered from the non-swelled epidermis layer and the part of the dermis layer containing pigment cells (the part of the dermis layer on the epidermis layer side). As this recovery method, for example, a method in which the skin layer hardened by the above-described insolubilization process is fixed and a knife or the like is used, and a physical cut by a human hand, a method of squeezing only the recovered portion of the dermis layer, or the dermis A method of sucking only the collected portion of the layer is exemplified.

(E) Drying The recovered dermis layer is in a gel form, and when an aqueous sodium chloride solution is added thereto, collagen is precipitated by salting out. The precipitated collagen is filtered out, dehydrated by adding alcohol, and the filtered product (raw collagen) is dried under reduced pressure to obtain dry collagen.

<Dry collagen packaging>
Next, in order to make the dry collagen obtained above into a form to be used in the next step, it is packaged with a sterilization packaging material. That is, 1 g of the dried collagen is packaged with a sterilization packaging material (hybrid plating bag HM-1304: manufactured by Hogi Medical Co., Ltd.) having carbon dioxide permeability, and the opening is heated and sealed using a heat sealer. The air permeability (breathability) on the sterilized paper side of the sterilization packaging material is within the range of about 10 to 30 seconds according to the air permeation resistance (Gurley method) according to JIS P 8117 (the above air permeation). The resistance is defined as the time for 100 mL of air to pass through 642 mm ² paper).

<Removal of odor components>
Next, a process for extracting and removing odor components contained in the dried collagen will be described. FIG. 2 shows a schematic configuration of an apparatus used in the process of extracting and removing odor components. That is, this apparatus includes a washing tank 1 that contains dry collagen to form a sealed space, and a supply tank 2 that supplies liquid carbon dioxide to the washing tank 1. In FIG. 2, P represents a pump, V-1 to V-4 represent valves, and V-5 represents a pressure reducing valve.

  Then, the dried collagen 3 that has been packaged with the sterilization packaging material prepared above is housed and sealed in the washing tank 1 in which the internal temperature is set to 5 ° C., and the valves V-1 to V-4 and the reduced pressure are sealed. After all the valves V-5 are closed, the valves V-1 and V-2 are opened, and liquid carbon dioxide is supplied from the supply tank 2 into the cleaning tank 1. At this time, the valve V-3 and the pressure reducing valve V-5 are opened, and liquid carbon dioxide is sufficiently supplied into the cleaning tank 1. Then, after supplying a predetermined amount of liquid carbon dioxide in the washing tank 1 (an amount in which dry collagen is immersed), all of the valves V-1 to V-4 and the pressure reducing valve V-5 are closed. The internal pressure is 4.0 MPa, and the dried collagen 3 is immersed in liquid carbon dioxide for 30 minutes.

  The supply of carbon dioxide in the liquid state to the cleaning tank 1 may be continuously performed by opening the valves V-1, V-2, V-3, and the pressure reducing valve V-5. Then, after the dried collagen 3 is immersed in liquid carbon dioxide, the valves V-2 and V-4 and the pressure reducing valve V-5 are opened, and the used liquid carbon dioxide containing the odor component extracted above is used. Is discharged outside the system. Thereafter, by collecting the dry collagen 3, dry collagen (non-brominated collagen) from which odor components have been removed can be obtained.

  According to this manufacturing method, since the temperature in the odor component extraction and removal step is low and the immersion time is relatively short, the dried collagen 3 is not denatured and can maintain its three-dimensional structure and quality. In addition, the organic solvent is not added to the carbon dioxide in the liquid state, and it is not necessary to undergo modification by the organic solvent due to contact under pressure, so that the quality can be maintained. Moreover, since the organic solvent and liquid carbon dioxide do not remain in the dry collagen 3, high-quality collagen with high purity can be produced. And since the dry collagen 3 is packaged with a sterilization packaging material, extraction and sterilization of odor components and sterilization are performed simultaneously, and the efficiency is high, and the dry collagen 3 when the washing tank 1 is returned to normal pressure is used. Spattering is prevented and recovery is possible without loss.

  In addition, although the dried collagen 3 is derived from salmon, it can effectively remove odor components that generate so-called fishy odor. It becomes a high-quality one that can be handled in the same manner as collagen derived from the like. Furthermore, since it is derived from fish, there is no risk of mad cow disease, foot-and-mouth disease, viral infection, etc., and it is safer. Moreover, since the obtained non-bromide collagen is already sterilized, it can be used as it is as a raw material for foods and cosmetics. And the obtained non-bromide collagen has an odor due to volatilization of 1-octen-3-ol, pentan-2-one, 1-penten-3-ol and 2,3-pentanedione which is avoided as a so-called fish odor. Since it does not easily occur, it can be added more to foods, cosmetics, and the like.

  In the above embodiment, salmon-derived collagen is used as the dry collagen 3, but various other fish can be used. Of course, collagen derived from a wide range of organisms such as fish, mammals such as cows and pigs, and birds such as chickens can be used.

  Moreover, in said embodiment, although the preparation of the dry collagen 3 is performed according to the process shown in [FIG. 1], you may carry out by the other method. However, it is preferable to carry out according to the process shown in FIG. 1 in view of less damage to collagen and good recovery efficiency of collagen. Commercially available dry collagen may also be used.

  In the above embodiment, the dry collagen 3 that has been packaged with a sterilization packaging material is used. However, it is preferable to use a sterilization packaging material that has been packaged, because removal of odorous components and sterilization can be performed at the same time, and recovery of collagen after removal of odorous components can be performed without loss.

  Moreover, in said embodiment, when extracting and removing an odor component, although the internal temperature of the washing tank 1 is set to 5 degreeC, internal temperature is the range of 0 degreeC-40 degreeC, More preferably, it is 5 degreeC. It can be set to any temperature within a range of ˜35 ° C. This is because if the temperature is too low, an extra cost for cooling the washing tank 1 is required, and conversely if too high, there is a tendency to cause damage such as collagen denaturation.

  Further, in the above embodiment, when extracting and removing the odor component, the dry collagen 3 is immersed in carbon dioxide in a liquid state for 30 minutes, but it is 5 minutes to 60 minutes, more preferably 10 minutes to 30 minutes. It can be immersed for any time in the range of. If the soaking time is too short, the odor component contained in the dry collagen 3 cannot be sufficiently extracted and removed. On the other hand, if it is too long, the dry collagen 3 tends to be damaged. .

  Moreover, in said embodiment, when extracting and removing an odor component, although the internal pressure of the septic tank 1 is 4.0 MPa, Preferably it is 3.5 MPa-10.0 MPa, More preferably, it is 4.0 MPa-9.MPa. It is desirable that the pressure be 0 MPa. This is because if the pressure is too low, carbon dioxide will boil and become a gas and the deodorization efficiency tends to deteriorate, and conversely if too high, the three-dimensional structure of the dried collagen 3 tends to be impaired.

  And in said embodiment, when extracting and removing an odor component, the said dry collagen 3 is immersed in the carbon dioxide of a liquid state, but it is wash | cleaned by adjusting the pressure and temperature in the washing tank 1. Carbon dioxide in the tank 1 may be in a supercritical state. When the dried collagen 3 is immersed in carbon dioxide in a supercritical state, more odor components and other impurities can be extracted and removed, and improvement in work efficiency and quality can be expected. Further, all of the immersion time may be immersed in supercritical carbon dioxide, or the total time of immersion in liquid carbon dioxide and supercritical carbon dioxide may be set as the immersion time.

  Next, examples will be described together with comparative examples. However, the present invention is not limited to this.

[Example 1]
In the step shown in FIG. 2, a cylindrical container having an inner diameter of 50 mm and a height of 200 mm is used as the washing tank 1, and the dried collagen 3 (in the washing tank 1 packaged with the sterilization packaging material described in the above embodiment) 1 g of salmon derived) was accommodated, and the washing tank 1 was sealed. Next, a siphon type liquid carbon dioxide cylinder was used as the supply tank 2, and liquid carbon dioxide was supplied from the supply tank 2 to the cleaning tank 1 as described in the above embodiment. At this time, the entire dried collagen 3 is immersed in carbon dioxide in a liquid state, and the immersion is continued for 30 minutes while the internal temperature of the washing tank 1 is 5 ° C. and the internal pressure is 4.0 MPa. The odor component contained in collagen 3 was extracted and removed. After completion of the immersion, the used liquid state carbon dioxide containing an odor component was discharged out of the system to obtain Example 1 product (non-brominated collagen).

[Example 2]
In the same manner as in Example 1, liquid carbon dioxide was supplied to the washing tank 1, the entire dried collagen 3 was immersed in liquid carbon dioxide, and the washing tank 1 was immediately washed with a silicon rubber heater (Om Heater, 100V). 60 W), the internal temperature of the cleaning tank 1 was set to 35 ° C., the internal pressure was set to 8.5 MPa, and the carbon dioxide was brought into a supercritical state. And the odor component contained in the dry collagen 3 was extracted and removed by continuing immersion for 30 minutes in that state. After completion of the immersion, used supercritical carbon dioxide containing an odor component was made into a liquid state and discharged out of the system to obtain Example 2 product (non-brominated collagen).

Example 3
Extraction removal of Example 2 was repeated 3 times, and Example 3 goods (non-brominated collagen) were obtained. That is, supply of carbon dioxide in a liquid state, heating of the washing tank 1, immersion in supercritical carbon dioxide, and use of carbon dioxide in a supercritical state containing an odor component in a liquid state until discharging out of the system. The series of steps was repeated three times for the same dry collagen 3.

[Comparative Example 1]
1 g of dried collagen 3 (derived from salmon) before extraction and removal of odorous components prepared in the above embodiment was used as one comparative example.

[Comparative Example 2]
Instead of the liquid carbon dioxide in Example 1, a product obtained by performing a treatment using carbon dioxide in the gas state was designated as Comparative Example 2. That is, a process of filling the inside of the washing tank 1 containing the dry collagen 3 with gaseous carbon dioxide, setting the internal temperature of the washing tank 1 to 20 ° C. and the internal pressure to 4.0 MPa, and continuing the state for 30 minutes. went.

  About the obtained Examples 1-3 goods, the comparative example 1 goods, and the comparative example 2 goods, the odor was evaluated by [gas chromatography] and [sensory test]. The evaluated samples, evaluation methods, and obtained results are shown below.

〔Gas chromatography〕
0.5 g of each of Examples 1 to 3 and Comparative Example 1 was collected and sealed in a 20 mL vial. These sealed vials were heated with an autosampler at 60 ° C. for 15 minutes, and then 5 mL of the gas in the head space was sampled with a syringe set at 70 ° C. (head space injection rate: 270 μL / second). Measurement was performed by gas chromatography (α Heracles, manufactured by Alpha MOS Co., Ltd.) under the measurement conditions shown. The measured chromatogram is shown in [FIG. 3] and its partially enlarged view [FIG. 4], and the detected peak areas are shown in [FIG. 5] and [FIG. 6]. The list of detected compounds is shown in [Table 1] below.

(Measurement condition)
Detection device: Flash fingerprint analyzer (α Heracles, Alpha M.O.S)
Column 1: DB-5 (nonpolar), diameter 100 μm, length 2 m
Column 2: DB-1701 (low / medium polarity), diameter 100 μm, length 2 m
Carrier gas: hydrogen column temperature: 40 ° C. (10 seconds) → (temperature rise at 5 ° C./second)→250° C. (5 seconds)
Detector: FID
Injector temperature: 200 ° C
Trap conditions: adsorption temperature 40 ° C, desorption temperature 250 ° C
Prepurge time: 5 seconds Trap preheat time: 20 seconds Trap cleaning time: 60 seconds Injection time: 1.5 seconds

  As a result of measurement by gas chromatography, as shown in [FIG. 3] to [FIG. 6], the products of Examples 1 to 3 were significantly reduced in odor components compared to the product of Comparative Example 1. In particular, the products of Examples 1 to 3 are pentane-2-one, 1-penten-3-ol, 2,3-pentanedione and run time 19 which are unpleasant odor components measured at around run time 7.56 seconds. No 1-octen-3-ol measured at around 59 seconds was detected (see [FIG. 3], [FIG. 5]).

〔sensory test〕
By 10 monitors (female), it was inspected how much the odor of Example 1 product, Example 3 product and Comparative Example 2 product was reduced with respect to untreated dry collagen (Comparative Example 1 product). The test was carried out by taking 10 mg of each sample on the palm of the hand, adding 0.2 mL of purified water dropwise and dissolving it, and immediately smelling it. The evaluation is a three-step evaluation shown in [Table 2] below, and the number of people evaluated is also shown in [Table 2].

  As a result of the sensory test, as shown in [Table 2] above, 90% of the people in Example 1 and 70% of the products in Example 3 felt that the odor was clearly reduced. Therefore, it was also clarified in the sensory test that each example product was not brominated. On the other hand, all the products of Comparative Example 2 did not feel a clear difference from untreated dry collagen, and no bromide was achieved.

  The method for producing non-brominated collagen of the present invention can extract and remove odor components contained in collagen without impairing the triple helical structure of the collagen, and the resulting non-brominated collagen can be used in foods, cosmetics and the like. Is suitable.

Claims (6)

  In the sealed space where the internal temperature is in the range of 0 ° C. to 40 ° C., the dry collagen is converted into carbon dioxide in a liquid state or a supercritical state containing no organic solvent in a step of preparing dry collagen obtained by drying collagen. A method for producing non-brominated collagen, comprising a step of immersing for 5 to 60 minutes and extracting and removing odor components contained in the dried collagen.   The method for producing a non-bromide collagen according to claim 1, wherein in the step of extracting and removing the odor component, the dried collagen is immersed in carbon dioxide in a liquid state or a supercritical state in a state of being packaged with a sterilization packaging material.   The method for producing non-brominated collagen according to claim 1 or 2, wherein the dry collagen is derived from fish.   A non-brominated collagen obtained by the method according to claim 1, wherein 1-octen-3-ol is a gas chromatograph as a component released when the non-brominated collagen is heated at 60 ° C. for 15 minutes. Non-brominated collagen, characterized in that it is not detected by measurement in the chromatography.   Pentan-2-one, 1-pentene-3 as a component released when the non-brominated collagen obtained by the method according to claim 1 is heated at 60 ° C. for 15 minutes. -At least one selected from the group consisting of ol and 2,3-pentanedione, which is not detected by measurement in gas chromatography.   The non-bromide collagen according to claim 4 or 5, wherein the non-bromide collagen is in a sterilized state.

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