Allulose composition with excellent stability

Abstract

This application relates to an allulose composition having excellent stability.

Description

Technical Field

[0001] This application relates to an allulose composition having excellent stability.

Background Art

[0002] Allulose is an epimer of fructose (D-fructose) and is a type of functional saccharide known as a rare sugar. It exhibits a high sweetness of about 60-70% of sugar, has almost zero calories, and is known to be effective in preventing and improving diabetes. Also, allulose is known to have excellent solubility and is one of the materials attracting attention for utilization in foods.

[0003] When allulose syrup is stored for a long time, allulose is converted into different substances or decomposed, resulting in a decrease in the allulose content. For example, allulose may be converted into different saccharides such as fructose or furfural-based substances such as HMF. As a result, the allulose syrup is decomposed or converted into different substances during storage, and the content gradually decreases.

Summary of the Invention

Problems to be Solved by the Invention

[0004] One example of this application relates to an allulose composition having excellent stability.

[0005] Another example of this application relates to a method of adjusting the dissolved oxygen content of an allulose composition to increase the stability of allulose.

Means for Solving the Problems

[0006] One example of this application relates to an allulose composition having excellent stability. Specifically, the allulose composition according to one example of this application can have a dissolved oxygen (DO) concentration of 8 ppm or less and excellent storage stability.

[0007] Another example of this application relates to a method for increasing the stability of allulose by adjusting the dissolved oxygen content of an allulose composition. Specifically, the method for increasing the stability of allulose according to an example of this application may involve reducing the dissolved oxygen (DO) of the allulose composition to increase storage stability. In this specification, storage stability of allulose means that the properties of allulose or allulose syrup measured immediately after production or at the start of storage are maintained or minimized during the storage period, and such properties include, but are not limited to, allulose content, pH, and / or color value.

[0008] The present application will be described in more detail below. One example of this application relates to an allulose composition containing dissolved oxygen at a specific concentration or less. The allulose composition may be one in which the rate of decrease in allulose content during storage is minimized.

[0009] For example, the dissolved oxygen concentrations of the allulose compositions according to one example of this application are 10 ppm or less, 9.5 ppm or less, 9 ppm or less, 8.5 ppm or less, 8 ppm or less, 7.5 ppm or less, 7 ppm or less, 6.9 ppm or less, 6.8 ppm or less, 6.7 ppm or less, 6.6 ppm or less, 6.5 ppm or less, 6.4 ppm or less, 6.3 ppm or less, 6.2 ppm or less, 6.1 ppm or less, 6 ppm or less, 5.9 ppm or less, 5.8 ppm or less, 5.7 ppm or less, 5.6 ppm or less, 5.5 ppm or less, 5.4 ppm or less, 5.3 ppm or less, 5.2 ppm or less, 5.1 ppm or less, 5 ppm or less, 4.9 ppm or less, 4.8 ppm or less, 4.7 ppm or less, 4 It may be 0.6 ppm or less, 4.5 ppm or less, 4.4 ppm or less, 4.3 ppm or less, 4.2 ppm or less, 4.1 ppm or less, 4 ppm or less, 3.9 ppm or less, 3.8 ppm or less, 3.7 ppm or less, 3.6 ppm or less, 3.5 ppm or less, 3.4 ppm or less, 3.3 ppm or less, 3.2 ppm or less, 3.1 ppm or less, 3 ppm or less, 2.9 ppm or less, 2.8 ppm or less, 2.7 ppm or less, 2.6 ppm or less, 2.5 ppm or less, 2.4 ppm or less, 2.3 ppm or less, 2.2 ppm or less, 2.1 ppm or less, 2 ppm or less, 1.9 ppm or less, 1.8 ppm or less, 1.7 ppm or less, 1.6 ppm or less, or 1.5 ppm or less.

[0010] For example, the oxygen saturation rates of the allulose composition according to one example of this application are 90%sat or less, 89%sat or less, 88%sat or less, 87%sat or less, 86%sat or less, 85%sat or less, 84%sat or less, 83%sat or less, 82%sat or less, 81%sat or less, 80%sat or less, 79%sat or less, 78%sat or less, 77%sat or less, 76%sat or less, and 75%sat. t or less, 74%sat or less, 73%sat or less, 72%sat or less, 71%sat or less, 70%sat or less, 69%sat or less, 68%sat or less, 67%sat or less, 66%sat or less, 65%sat or less, 64%sat or less, 63%sat or less, 62%sat or less, 61%sat or less, 60%sat or less, 59%sat or less, 58%sat or less, 57%sat or less, 56%s below at, below 55% sat, below 54% sat, below 53% sat, below 52% sat, below 51% sat, below 50% sat, below 49% sat, below 48% sat, above 47% sat Below, 46%sat or less, 45%sat or less, 44%sat or less, 43%sat or less, 42%sat or less, 41%sat or less, 40%sat or less, 39%sat or less, 38%sat or less, 37 The oxygen saturation rate may be less than or equal to %sat, less than or equal to 36%sat, less than or equal to 35%sat, less than or equal to 34%sat, less than or equal to 33%sat, less than or equal to 32%sat, less than or equal to 31%sat, less than or equal to 30%sat, less than or equal to 29%sat, less than or equal to 28%sat, less than or equal to 27%sat, less than or equal to 26%sat, less than or equal to 25%sat, less than or equal to 24%sat, less than or equal to 23%sat, less than or equal to 22%sat, less than or equal to 21%sat, or less than or equal to 20%sat. The oxygen saturation rate is the oxygen saturation of the allulose composition based on an oxygen saturation of 100% in the air. The oxygen saturation in the air may be, for example, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, or 25%.

[0011] The dissolved oxygen concentration or oxygen saturation rate may be measured under normal temperature conditions (20-30°C, for example, 24.5°C).

[0012] An allulose composition according to an example of this application can provide an allulose composition with improved storage stability, maintaining the maximum allulose content under storage conditions such as storage and distribution immediately after production. In this specification, storage stability of an allulose composition may mean that the allulose content contained in the allulose composition is the same as immediately after production, or that the decrease in allulose content is minimized.

[0013] For example, using the allulose solid content of 100% by weight immediately after the manufacture of the allulose composition or at the start of storage as a baseline, the rate of decrease in the allulose solid content during the storage period may be close to 0%, for example, the rate of decrease in allulose content may be 10% or less, 9% or less, 8% or less, 7% or less, 6.5% or less, 6.3% or less, 6% or less, 5% or less, 4.5% or less, 4% or less, 3.5% or less, 3% or less, 2.5% or less, 2% or less, 1.9% or less, 1.8% or less, 1.7% or less, 1.6% or less, 1.5% or less, 1.4% or less, 1.3% or less, 1.2% or less, 1.1% or less, 1% or less, 0.9% or less, 0.8% or less, 0.7% or less, 0.6% or less, 0.5% or less, 0.4% or less, 0.3% or less, 0.2% or less, or 0.1% or less. As an example, the rate of decrease in allulose content can be the rate of decrease in allulose content measured after storage at 45°C for 7 days or at 35°C for 4 weeks, based on 100% of the content immediately after manufacturing or at the start of storage of the allulose syrup. Specifically, it can be the rate of decrease in the allulose solid content (e.g., by weight) contained in the allulose syrup.

[0014] As an example, an allulose composition according to an example of this application may have a dissolved oxygen concentration of 8 ppm or less and a reduction in allulose content of 5% or less after being stored at 45°C for 7 days, a dissolved oxygen concentration of 6.7 ppm or less and a reduction in allulose content of 1.4% or less after being stored at 45°C for 7 days, a dissolved oxygen concentration of 6 ppm or less and a reduction in allulose content of 1.1% or less after being stored at 45°C for 7 days, or a dissolved oxygen concentration of 4.3 ppm or less and a reduction in allulose content of 1% or less after being stored at 45°C for 7 days.

[0015] As an example, an allulose composition according to an example of this application may have a dissolved oxygen concentration of 8 ppm or less and a reduction in allulose content of 10% or less after storage at 35°C for 4 weeks, a dissolved oxygen concentration of 6.7 ppm or less and a reduction in allulose content of 6.5% or less after storage at 35°C for 4 weeks, a dissolved oxygen concentration of 5 ppm or less and a reduction in allulose content of 6.3% or less after storage at 35°C for 4 weeks, or a dissolved oxygen concentration of 3.9 ppm or less and a reduction in allulose content of 6% or less after storage at 35°C for 4 weeks.

[0016] An allulose composition according to an example of this application has improved storage stability, and under storage conditions such as storage and distribution, the pH of the allulose remains the same as immediately after manufacture, or the decrease in pH is minimized.

[0017] Therefore, an allulose composition according to an example of this application can be made in which pH reduction is prevented, for example, using the pH immediately after production of the allulose composition or at the start of storage as a reference, after storing the allulose composition at a temperature of 35°C for 4 weeks, the pH reduction value can be 1 or less, 0.9 or less, 0.85 or less, 0.8 or less, 0.75 or less, 0.7 or less, 0.65 or less, 0.6 or less, or 0.55 or less.

[0018] As an example, an allulose composition according to an example of this application may have a dissolved oxygen concentration of 8 ppm or less and a pH decrease of 1 or less after storage at 35°C for 4 weeks, a dissolved oxygen concentration of 6.7 ppm or less and a pH decrease of 0.83 or less after storage at 35°C for 4 weeks, a dissolved oxygen concentration of 5 ppm or less and a pH decrease of 0.7 or less after storage at 35°C for 4 weeks, or a dissolved oxygen concentration of 3.9 ppm or less and a pH decrease of 0.65 or less after storage at 35°C for 4 weeks.

[0019] Since allulose decomposition is accelerated at low pH, pH is a very important factor in the stability of allulose content. The allulose syrup according to an example of this application exhibits a very low decrease in pH during storage, allowing for maximum storage of allulose content.

[0020] An allulose composition according to an example of this application may have improved storage stability, and the color value of the allulose may remain the same as immediately after manufacture, or the increase in color value (e.g., browning) may be minimized under storage conditions such as storage and distribution from immediately after manufacture.

[0021] Therefore, the allulose composition according to one example of this application may be one in which browning is prevented, for example, based on the color value immediately after the manufacture of the allulose composition or at the start of storage, the color value increase rate after storing the allulose composition at a temperature of 35°C for 4 weeks may be 250% or less, 240% or less, 230% or less, 225% or less, 220% or less, 210% or less, 205% or less, 200% or less, 190% or less, 185% or less, 180% or less, 175% or less, 170% or less, 165% or less, 160% or less, 155% or less, 150% or less, 145% or less, 140% or less, 135% or less, 130% or less, 125% or less, 120% or less, 115% or less, or 110% or less.

[0022] An example of an allulose composition according to this application may be in liquid or syrup form. In this case, the solid content of the allulose liquid composition or allulose syrup may be, for example, 30 Brix or more, 40 Brix or more, 50 Brix or more, 60 Brix or more, more than 60 Brix, or 64 Brix or more. As an example, the solid content of the allulose liquid composition or allulose syrup may be 30-99 Brix, 30-95 Brix, 30-90 Brix, 30-85 Brix, 30-80 Brix, 30-75 Brix, 30 Brix or more and less than 73 Brix, 30-70 Brix, 30-69 Brix, 30-68 Brix, 40-99 Brix, 40-95 Brix, 40-90 Brix, 40-85 Brix, 4 0-80 Brix, 40 Brix or higher and less than 73 Brix, 40-75 Brix, 40-70 Brix, 40-69 Brix, 40-68 Brix, 50-99 Brix, 50-95 Brix, 50-90 Brix, 50-85 Brix, 50-80 Brix, 50-75 Brix, 50 Brix or higher and less than 73 Brix, 50-70 Brix, 50-69 Brix, 50-68 Brix, 60-99 Brix, 6 0-95 Brix, 60-90 Brix, 60-85 Brix, 60-80 Brix, 60-75 Brix, 60 Brix or more but less than 73 Brix, 60-70 Brix, 60-69 Brix, 60-68 Brix, over 60 and 99 Brix or less, over 60 and 95 Brix or less, over 60 and 90 Brix or less, over 60 and 85 Brix or less, over 60 and 80 Brix or less, over 60 and 75 Brix or more The following are also acceptable: below, over 60 and less than 73 Brix, over 60 and 70 Brix or less, over 60 and 69 Brix or less, over 60 and 68 Brix or less, 64-99 Brix, 64-95 Brix, 64-90 Brix, 64-85 Brix, 64-80 Brix, 64-75 Brix, 64 Brix or more and less than 73 Brix, 64-70 Brix, 64-69 Brix, or 64-68 Brix.

[0023] The allulose liquid composition or allulose syrup may contain allulose in amounts of 0.1% by weight or more, 3% by weight or more, 5% by weight or more, 10% by weight or more, 20% by weight or more, 30% by weight or more, 40% by weight or more, 50% by weight or more, 60% by weight or more, or, for example, 0.1 to 100% by weight, based on a solid content of 100% by weight. For example, it may be a low-purity allulose syrup containing 1 to 50% by weight, 3 to 35% by weight, 3 to 25% by weight, 3 to 20% by weight, 5 to 35% by weight, 5 to 25% by weight or 5 to 20% by weight, or a high-purity allulose solution containing 70% by weight or more, 75% by weight or more, 80% by weight or more, 85% by weight or more, 90% by weight or more, 95% by weight or more, 96% by weight or more, 97% by weight or more, or 98% by weight or more.

[0024] The viscosity of the allulose syrup can be 2 cps to 200 cps at a temperature of 45°C, and the electrical conductivity may be 1000 uS / cm or less, for example 0.01 to 1000 uS / cm, 200 uS / cm or less, 150 uS / cm or less, 100 uS / cm or less, 80 uS / cm or less, 50 uS / cm or less, 30 uS / cm or less, for example 0.1 to 200 uS / cm, 0.1 to 150 uS / cm, 0.1 to 100 uS / cm, 0.1 to 0.1 to 80 uS / cm, 0.1 to 50 uS / cm, or 0.1 to 30 uS / cm.

[0025] An allulose syrup according to an example of this application may have a pH of 2.8 or higher, or 5.5 or lower, at the start of storage. For example, it may be 2.8-5.5, 3.8-5.5, 3.9-5.5, 4.0-5.5, 4.1-5.5, 4.2-5.5, 4.3-5.5, 4.4-5.5, 4.5-5.5, 4.6-5.5, 4.7-5.5, or 4.8-5.5.

[0026] In a specific example, the allulose syrup can be obtained by a production method including an activated carbon treatment, an SMB chromatography high-purity separation, and an ion purification step of a biologically obtained allulose-containing solution. Optionally, a step of concentrating the allulose syrup treated in the purification step can be further performed, or an ion purification step can be further performed after the activated carbon treatment step of the allulose-containing solution and before the high-purity separation. The ion purification step performed after the activated carbon treatment step may be the same as or different from the ion purification step performed after the high-purity separation step, and the ion exchange resin is not particularly limited.

[0027] The biologically obtained allulose-containing solution can be produced by culturing a microorganism that produces allulose epimerase or a recombinant microorganism into which a gene encoding allulose epimerase has been introduced, and reacting the microorganism that produces allulose epimerase or the allulose epimerase obtained therefrom with a fructose-containing raw material. The allulose epimerase can be carried out by a liquid reaction or a solid reaction using an immobilized enzyme. An example of the allulose conversion reaction is described in Korean Registered Patent No. 10-1318422 and the like.

[0028] The allulose-containing solution is subjected to SMB chromatography separation to separate it into an allulose fraction with a high allulose content and a fructose raffinate from the conversion reaction product. The allulose fraction can be subjected to an ion purification step to produce an allulose syrup product, or an additional concentration step can be performed to produce a concentrated product. Separation / purification can include separating the allulose content in the allulose fraction to be 85% by weight or more, for example, 85% to 95% (w / w) or more.

[0029] Another example of the present application relates to an allulose storage package including an allulose composition according to an example of the present application and a storage container. The package may be sealed and the dissolved oxygen concentration of the allulose composition may not change or may be minimized.

[0030] A storage container for allulose applicable to this application includes a container body having a storage space formed inside and an opening at the top connected to the storage space, and includes a lid member that is detachably coupled to the opening of the container body and seals the storage space. The shape or form of the container is not particularly limited.

[0031] The storage container may be made of metal, a metal alloy, or a polymer material. If it is made of metal or a metal alloy, the inner surface of the container is preferably coated with a polymer to minimize direct contact with the allulose syrup. The coating on the inner surface of the container preferably covers the entire interior of the container, and the coating may include a single coating, a double coating, or a multi-layer coating of three or more layers, and may consist of two or more layers to minimize direct contact between the allulose syrup and the metal or metal alloy material. The metal or metal alloy material is not particularly limited as long as it is a material that can be used for food containers. For example, the container may be made of tin or a tin alloy. The coating agent on the inner surface of the container is not particularly limited as long as it is a substance that can be used for food containers. For example, it may be an epoxyphenol resin that can be used for food containers, and the inner surface of the container may include a coating layer of epoxyphenol resin, specifically a commercially available product such as Canguard 5K-872 (trade name). Another example of this application relates to a method for increasing the stability of allulose, which includes a step of adjusting the dissolved oxygen in the allulose composition.

[0032] Another example of this application relates to a method for preventing browning of allulose, which includes a step of adjusting the dissolved oxygen (DO) of the allulose composition.

[0033] Another example of this application relates to a method for producing an allulose composition, comprising the steps of converting fructose to allulose to obtain an allulose composition and adjusting the dissolved oxygen in the allulose composition.

[0034] The step of adjusting the dissolved oxygen may be a step of reducing the dissolved oxygen. The step of reducing the dissolved oxygen may be to remove the dissolved oxygen from the allulose composition or to prevent an increase in the dissolved oxygen of the allulose composition.

[0035] The aforementioned step of adjusting dissolved oxygen may include one or more selected from the following 1 to 5: (1) A step of treating the allulose composition with an oxygen absorber; (2) A step of packaging the allulose composition with a selective permeable packaging material; (3) A step of replacing with an inert gas; (4) The process of vacuum degassing; and (5) A step of adjusting, for example reducing, the head space of the container containing the allulose composition.

[0036] The selectively permeable packaging material may be an oxygen-impermeable packaging material.

[0037] The step of performing the inert gas replacement involves replacing the dissolved oxygen in the allulose composition with an inert gas, wherein the inert gas means a gas that does not cause a decrease in allulose content, or a gas that causes a decrease in allulose content to a lesser extent compared to oxygen.

[0038] The step of adjusting the dissolved oxygen may involve adjusting the dissolved oxygen concentration of the allulose composition to 8 ppm or less, or the oxygen saturation rate to 90% sat or less. [Effects of the Invention]

[0039] An allulose composition according to an example of this application contains dissolved oxygen at a specific concentration, has a high allulose content storage rate, and exhibits excellent storage stability. Therefore, even when allulose syrup is stored and distributed for a long period of time, the decomposition or conversion of allulose is prevented, and the decrease in allulose content can be minimized. [Brief explanation of the drawing]

[0040] [Figure 1] This figure shows the percentage change in allulose content after storing an allulose composition according to an example of this application at a temperature of 35°C for 4 weeks. [Modes for carrying out the invention]

[0041] The present application will be described in further detail below with reference to the following embodiments. However, these embodiments are for illustrative purposes only and do not limit the scope of the present application. [Examples]

[0042] Example 1: Stability of allulose syrup with respect to dissolved oxygen concentration (1) To clarify the effect of dissolved oxygen concentration on the stability of allulose content in allulose syrup, allulose syrup samples with different dissolved oxygen concentrations were stored under harsh conditions for 7 days, and then the change in allulose content was measured.

[0043] Specifically, allulose syrup (liquid sample) with an allulose purity of 98 wt / wt%, pH 4.1, and solid content of 60 Brix was placed in a 500 ml polyethylene sample container, and the dissolved oxygen concentration was corrected by stirring the allulose syrup. The stirring speed was varied from 150 to 200 rpm, and the stirring time from 0 to 30 seconds, and the dissolved oxygen concentration was measured in real time using a DO meter (Hanna edge DO meter). Saturated dissolved oxygen concentrations of 10-20% could be adjusted by aeration alone without stirring, while values ​​above that were adjusted by varying the stirring speed and stirring time. Once the saturated dissolved oxygen concentration reached a certain value, the container was immediately sealed to maintain the dissolved oxygen concentration. The dissolved oxygen concentrations of the four types of allulose syrup produced are listed in Table 1.

[0044] Each allulose syrup sample was stored at 45°C and an accelerated test was performed. After 7 days of storage, a small amount of each sample was taken, diluted with water to 3 Brix, and an analytical sample was prepared. The allulose content of the analytical sample was measured by HPLC analysis. The specific HPLC analysis conditions were as follows: an 87C (Biorad HPX-87C, 7.8 mmΦ × 300 mm) column was used, the temperature was 80°C, and 100% water was flowed as the mobile phase at a flow rate of 0.6 ml / min. Detection was performed using an RI detector. In Table 1, the allulose content is the allulose content based on 100% by weight of the solid content of the allulose syrup.

[0045] [Table 1]

[0046] Example 2: Stability of allulose syrup with respect to dissolved oxygen concentration (2) Using allulose syrup with an allulose purity of 98 wt / wt%, pH 4.1, and a solids content of 64 Brix, the change in allulose content and the rate of change due to dissolved oxygen concentration were carried out in substantially the same manner as in Example 1, and are shown in Table 2.

[0047] [Table 2]

[0048] Example 3: Stability of allulose syrup according to dissolved oxygen concentration (3) Using allulose syrup with an allulose purity of 98 wt / wt%, pH 4.1, and a solids content of 68 Brix, the change in allulose content and the rate of change due to dissolved oxygen concentration were carried out in substantially the same manner as in Example 1, and are shown in Table 3.

[0049] [Table 3]

[0050] Example 4: Stability of allulose syrup with respect to dissolved oxygen concentration (4) Using allulose syrup with an allulose purity of 98 wt / wt%, pH 4.1, and a solids content of 73 Brix, the change in allulose content and the rate of change due to dissolved oxygen concentration were carried out in substantially the same manner as in Example 1, and are shown in Table 4.

[0051] [Table 4]

[0052] As shown in Tables 1 to 4, the allulose loss rate was low as the dissolved oxygen concentration of the allulose syrup decreased. Specifically, when stored at 45°C for 7 days, the allulose content reduction rate of allulose syrup with a dissolved oxygen concentration of 8 ppm or less, or an oxygen saturation rate of 90% sat or less, was 5% or less, indicating remarkably excellent storage stability of the allulose syrup.

[0053] Example 5: Stability of allulose syrup based on dissolved oxygen concentration during long-term storage (1) To clarify the effect of dissolved oxygen concentration on the stability of allulose content during long-term storage of allulose syrup, allulose syrup samples with different dissolved oxygen concentrations were stored for 4 weeks, and the change in allulose content was measured afterward.

[0054] Specifically, allulose syrups with an allulose purity of 97% or higher, pH 4.15, and solid content of 60 Brix were prepared. After adjusting the dissolved oxygen concentration in the same manner as in Example 1, each sample was stored at 35°C for 4 weeks. The allulose content was then measured, and the rate of change in allulose content was calculated and shown in Table 5 and Figure 1. In Table 5, the allulose content is shown based on 100% by weight of the solid content of the allulose syrup.

[0055] [Table 5]

[0056] Example 6: Stability of allulose syrup based on dissolved oxygen concentration during long-term storage (2) Using allulose syrup with an allulose purity of 97% or higher, pH 4.15, and solid content of 64 Brix, the change in allulose content due to dissolved oxygen concentration was carried out in substantially the same manner as in Example 5, and the change in amount and rate of change are shown in Table 6 and Figure 1. In Table 6, the allulose content is the allulose content based on 100% by weight of the solid content of the allulose syrup.

[0057] [Table 6]

[0058] Example 7: Stability of allulose syrup based on dissolved oxygen concentration during long-term storage (3) Using allulose syrup with an allulose purity of 97% or higher, pH 4.15, and solid content of 68 Brix, the change in allulose content and the rate of change due to dissolved oxygen concentration were carried out in substantially the same manner as in Example 5, and are shown in Table 7 and Figure 1. In Table 7, the allulose content is the allulose content based on 100% by weight of the solid content of the allulose syrup.

[0059] [Table 7]

[0060] Example 8: Stability of allulose syrup based on dissolved oxygen concentration during long-term storage (4) Using allulose syrup with an allulose purity of 97% or higher, pH 4.15, and solid content of 73 Brix, the change in allulose content and the rate of change due to dissolved oxygen concentration were carried out in substantially the same manner as in Example 5, and are shown in Table 8 and Figure 1. In Table 8, the allulose content is the allulose content based on 100% by weight of the solid content of the allulose syrup.

[0061] [Table 8]

[0062] As shown in Tables 5 to 8, the lower the dissolved oxygen concentration of the allulose syrup, the lower the allulose loss rate. Specifically, when stored at 35°C for 4 weeks, the dissolved oxygen concentration was 8 ppm or less, or the oxygen saturation rate was 90% sat or less, and the allulose content reduction rate of the allulose syrup was 10% or less, indicating remarkably excellent storage stability of the allulose syrup. In particular, as shown in Figure 1, the change in allulose content due to dissolved oxygen concentration was significantly more pronounced in allulose syrups with a Brix of 64 or higher.

[0063] Therefore, by adjusting the dissolved oxygen tolerance of allulose syrup, it is possible to prevent quality deterioration due to a decrease in allulose content during the distribution period, and to provide allulose syrup with excellent allulose content maintenance effect and high stability.

[0064] Example 9: pH stability of allulose syrup based on dissolved oxygen concentration For allulose syrups in Examples 5-8, the pH was measured immediately after sample preparation. After storage at 35°C for 4 weeks, the pH was measured again, and the pH change was calculated and is shown in Table 9.

[0065] [Table 9]

[0066] As shown in Table 9, the lower the dissolved oxygen concentration of the allulose syrup, the lower the pH decrease. Specifically, when stored at 35°C for 4 weeks, allulose syrup with a dissolved oxygen concentration of 8 ppm or less, or an oxygen saturation rate of 90% sat or less, showed a pH decrease of 1 or less, demonstrating remarkably superior pH stability.

[0067] Example 10: Color stability of allulose syrup with respect to dissolved oxygen concentration. For allulose syrups in Examples 5-8, the color value was measured immediately after sample preparation. After storage at 35°C for 4 weeks, the color value was measured again, and the percentage change in color was calculated and shown in Table 10. The color value was measured at 420 nm using a 1 cm quartz cell after diluting the allulose syrup to 30 lbs using a spectrophotometer (SHIMADZU).

[0068] [Table 10]

[0069] As shown in Table 10, the lower the dissolved oxygen concentration, the lower the rate of color change in allulose syrup. This means that it may be possible to prevent browning of allulose syrup by adjusting the dissolved oxygen concentration.

Claims

1. A liquid allulose composition containing allulose, wherein the dissolved oxygen (DO) concentration is 8 ppm or less, or the oxygen saturation rate is 90% sat or less.

2. The composition according to claim 1, wherein the solid content of the composition is 30 to 99 Brix.

3. The composition according to claim 1, wherein the allulose content of the composition is 5% by weight or more, based on 100% by weight of the total solid content of the composition.

4. The composition according to claim 1, wherein the pH of the composition is 2.8 to 5.

5.

5. The composition according to claim 1, wherein the reduction rate of allulose content after storage at a temperature of 45°C for 7 days is 10% or less, based on the allulose content at the start of storage.

6. The composition according to claim 1, wherein the reduction rate of allulose content after storage at a temperature of 35°C for 4 weeks is 10% or less, based on the allulose content at the start of storage.

7. The composition according to claim 1, wherein the pH decrease after storage at a temperature of 35°C for 4 weeks is 1 or less, based on the pH at the start of storage.

8. The composition according to claim 1, wherein the color value increase rate after storage at a temperature of 35°C for 4 weeks is 250% or less, based on the color value at the start of storage.

9. Allulose storage package comprising the composition according to any one of claims 1 to 8 and a storage container.

10. The package according to claim 9, wherein the package is sealed.

11. A method for increasing the stability of an allulose composition, comprising the step of reducing the dissolved oxygen (DO) concentration of the allulose composition to 8 ppm or less, or the oxygen saturation rate to 90 sat% or less.

12. The method according to claim 11, wherein the step of reducing dissolved oxygen includes one or more selected from the following 1 to 5: (1) The process of processing the oxygen absorber; (2) The process of packaging with selectively permeable packaging material; (3) Step of performing inert gas replacement; (4) The process of vacuum degassing; and (5) A step of adjusting the head space of the container containing the allulose composition.

13. A method for preventing browning of allulose, comprising the step of reducing the dissolved oxygen (DO) concentration of the allulose composition to 8 ppm or less, or the oxygen saturation rate to 90 sat% or less.

14. A step of converting fructose to allulose to obtain an allulose composition; and A method for producing an allulose composition, comprising the step of reducing the concentration of dissolved oxygen (DO) in the allulose composition to 8 ppm or less, or the oxygen saturation rate to 90 sat% or less.

15. The method according to claim 14, wherein the step of reducing dissolved oxygen includes one or more selected from the following 1 to 5: (1) The process of processing the oxygen absorber; (2) The process of packaging with selectively permeable packaging material; (3) Step of performing inert gas replacement; (4) The process of vacuum degassing; and (5) A step of adjusting the headspace of the container containing the allulose composition.

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