Tannin / reduced iron powder deoxidizer and preparation method thereof

Abstract

The invention discloses a tannin / reduced iron powder deoxidizer and a preparation method thereof, and belongs to the technical field of deoxidizers. Active components of the tannin / reduced iron powder deoxidizer comprise tannin and reduced iron powder. The tannin / reduced iron powder deoxidizer with strong deoxidization capability is prepared by taking the tannin and the reduced iron powder as active components, and the tannin and the reduced iron powder have a synergistic deoxidization effect. The tannin / reduced iron powder deoxidizer provided by the invention can be used for deoxidation preservation of food, medicines or precise instruments.

Description

Technical Field

[0001] The invention belongs to the technical field of deoxidizers, and in particular relates to a tannin / reduced iron powder deoxidizer and a preparation method thereof. Background Art

[0002] Deoxidizers, also known as deoxidizers or oxygen absorbers, are a type of additive that can absorb oxygen and slow down the oxidation of products. Deoxidizers can provide an oxygen-free or low-oxygen environment, thereby maintaining product quality and extending its shelf life. Deoxidizers can be roughly divided into two categories: inorganic deoxidizers and organic deoxidizers according to their chemical composition. Inorganic deoxidizers are generally based on sulfites or iron powder. Sulfite deoxidizers release SO2 gas and produce odor during the deoxidation reaction; iron powder deoxidizers must be in a high humidity environment to trigger the deoxidation reaction. The deoxidation amount drops sharply in a low humidity environment, and it is not applicable to the storage of low-moisture products such as nuts, baked goods, precision instruments, etc.

[0003] There are three main types of organic deoxidizers: ascorbic acid deoxidizer, α-tocopherol deoxidizer, and bio-enzyme deoxidizer. Ascorbic acid deoxidizer has a fast deoxidation speed, but it is expensive and requires a metal catalyst; α-tocopherol deoxidizer usually needs to be combined with transition metal catalysts such as iron, copper, manganese and cobalt to deoxidize; bio-enzyme deoxidizer requires a mild deoxidation condition, and the temperature and pH value will affect the deoxidation efficiency of the enzyme, and the deoxidation conditions are relatively harsh. In general, most organic deoxidizers require the addition of transition metal salts such as iron salts, cobalt salts, or ultraviolet rays as catalysts or initiators to catalyze or stimulate the deoxidation reaction, and after deoxidation, deoxidation by-products will be produced, resulting in unpleasant odors remaining in the packaging container, making it difficult for them to come into direct contact with food.

[0004] Tannin is a natural plant polyphenol with a wide variety of species, widely distributed in the fruits, berries, leaves and flowers of woody and non-woody plants. Tannin can be divided into two categories according to its chemical structure: hydrolyzed tannin and condensed tannin. Hydrolyzed tannin is also called gallate tannin, such as gallnut tannin, tara tannin, oak tannin, etc.; condensed tannin is also called polyflavanol tannin, such as bayberry tannin, larch tannin, quebracho tannin, black wattle tannin, etc. At present, the research on tannin mainly focuses on the antibacterial property, astringency, and complexation of tannin. There are no reports on the deoxidation of tannin and tannin deoxidizer. Summary of the invention

[0005] The purpose of the present invention is to provide a tannin / reduced iron powder deoxidizer and a preparation method thereof. By using tannin and reduced iron powder as active ingredients of the deoxidizer, the tannin and reduced iron powder synergistically deoxidize to obtain a composite deoxidizer with strong deoxidation ability.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] One of the technical solutions of the present invention is to provide a tannin / reduced iron powder deoxidizer, wherein the active ingredients include tannin and reduced iron powder.

[0008] Preferably, the mass ratio of the tannin to the reduced iron powder is 10:1 to 1:10.

[0009] Optionally, the tannin includes hydrolyzable tannin and / or condensed tannin.

[0010] More preferably, the hydrolyzable tannins include one or more of gallnut tannin, tara tannin, ellagitannin and emblica tannin, and the condensed tannins include one or more of bayberry tannin, larch tannin, quebracho tannin and black wattle tannin.

[0011] The tannins of the present invention are preferably from a wide range of sources, are easy to obtain, and are low in cost. Other tannins besides the above tannins can also achieve the technical purpose of the present invention.

[0012] The second technical solution of the present invention is to provide a method for preparing the above-mentioned tannin / reduced iron powder deoxidizer, comprising the following steps:

[0013] The tannin / reduced iron powder deoxidizer is obtained by mixing tannin, reduced iron powder, adhesive and wetting agent, granulating and drying.

[0014] Optionally, the adhesive is starch; and the wetting agent is anhydrous ethanol.

[0015] Preferably, the mass ratio of the reduced iron powder to the binder is 1:1-20.

[0016] Preferably, the tannin is sieved through a 100-mesh sieve before being mixed with the reduced iron powder.

[0017] Preferably, the granulation is achieved by extruding and sieving the mixture after mixing all the raw materials, and the mesh number of the sieve used during the extrusion and sieving is 2 to 100 meshes.

[0018] Preferably, the drying is vacuum drying at 50°C.

[0019] The purpose of drying is to remove the wetting agent.

[0020] The third technical solution of the present invention is to provide a composite deoxidizer, the components of which include the above-mentioned tannin / reduced iron powder deoxidizer.

[0021] Preferably, the components of the composite deoxidizer further include hygroscopic substances and / or alkaline substances.

[0022] More preferably, the hygroscopic substance comprises vermiculite; and the alkaline substance comprises sodium carbonate.

[0023] The alkaline substance added in the present invention can provide an alkaline environment for the deoxygenation reaction of tannin, help the protons in the tannin molecules to ionize, further improve the oxygen absorption characteristics of tannin, and enhance the deoxygenation effect.

[0024] More preferably, the amount of sodium carbonate added is no more than 3 times the mass of tannin in the tannin / reduced iron powder deoxidizer.

[0025] The fourth technical solution of the present invention is to provide an application of the above-mentioned tannin / reduced iron powder deoxidizer or the above-mentioned composite deoxidizer in the deoxidation and preservation of food, medicine or precision instruments.

[0026] Preferably, the tannin / reduced iron powder deoxidizer or the composite deoxidizer is used under the following conditions: temperature 4-40° C. and relative humidity 40-100% RH.

[0027] The beneficial technical effects of the present invention are as follows:

[0028] The invention uses the active ingredients of tannin and reduced iron powder to prepare a tannin / reduced iron powder deoxidizer with strong deoxidation ability, wherein the tannin and reduced iron powder have a synergistic deoxidation effect.

[0029] The tannin / reduced iron powder deoxidizer provided by the invention can be used for deoxidation and preservation of food, medicine or precision instruments. DETAILED DESCRIPTION

[0030] Now, various exemplary embodiments of the present invention are described in detail, and this detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present invention. It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0031] In addition, for the numerical range in the present invention, it is understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0032] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention pertains. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention.

[0033] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0034] Example 1

[0035] After passing gallnut tannin and reduced iron powder through a 100-mesh sieve respectively, starch and anhydrous ethanol are added, and the mixture is evenly stirred to obtain a mixture that can be lightly kneaded into a mass. The mixture is extruded through an 8-mesh sieve to granulate, and vacuum dried at 50° C. to obtain a deoxidizer, wherein the mass ratio of tannin to reduced iron powder is 1:0.5, and the mass ratio of reduced iron powder to starch is 1:1.

[0036] The deoxidation amount of the deoxidizer prepared in Example 1 was measured under 100% RH and 25° C. The results are shown in Table 1.

[0037] Example 2

[0038] After passing gallnut tannin and reduced iron powder through a 100-mesh sieve respectively, starch and anhydrous ethanol are added, and the mixture is evenly stirred to obtain a mixture that can be lightly kneaded into a mass. The mixture is extruded through a 20-mesh sieve to granulate, and vacuum dried at 50° C. to obtain a deoxidizer, wherein the mass ratio of tannin to reduced iron powder is 1:1, and the mass ratio of reduced iron powder to starch is 1:5.

[0039] The deoxidation amount of the deoxidizer prepared in Example 2 was measured under 100% RH and 35° C. The results are shown in Table 1.

[0040] Comparative Example 1

[0041] Compared with Example 2, the only difference is that tannin is omitted.

[0042] The deoxidation amount of the deoxidizer prepared in Comparative Example 1 was measured under 100% RH and 35° C. The results are shown in Table 1.

[0043] Comparative Example 2

[0044] Compared with Example 2, the only difference is that the reduced iron powder is omitted.

[0045] The deoxidation amount of the deoxidizer prepared in Comparative Example 2 was measured under 100% RH and 35° C. The results are shown in Table 1.

[0046] Example 3

[0047] After passing bayberry tannin and reduced iron powder through a 100-mesh sieve respectively, starch and anhydrous ethanol are added, and the mixture is evenly stirred to obtain a mixture that can be lightly kneaded into a mass. The mixture is extruded through a 50-mesh sieve to granulate, and vacuum dried at 50° C. to obtain a deoxidizer, wherein the mass ratio of tannin to reduced iron powder is 1:3, and the mass ratio of reduced iron powder to starch is 1:2.

[0048] The deoxidation amount of the deoxidizer prepared in Example 3 was measured under an environment of 83% RH and 35° C. The results are shown in Table 1.

[0049] Example 4

[0050] After Tara tannin and reduced iron powder were passed through a 100-mesh sieve respectively, starch and anhydrous ethanol were added, and the mixture was evenly stirred to obtain a mixture that was lightly kneaded into a mass. The mixture was extruded through a 100-mesh sieve to granulate, and the mixture was vacuum-dried at 50° C. and evenly blended with sodium carbonate to obtain a deoxidizer, wherein the mass ratio of tannin to reduced iron powder was 1:0.1, the mass ratio of reduced iron powder to starch was 1:20, and the mass ratio of tannin to sodium carbonate was 1:3.

[0051] The deoxidation amount of the deoxidizer prepared in Example 4 was measured under an environment of 55% RH and 35° C. The results are shown in Table 1.

[0052] Example 5

[0053] After rubber bowl tannin and reduced iron powder were passed through a 100-mesh sieve respectively, starch and anhydrous ethanol were added, and the mixture was evenly stirred to obtain a mixture that was lightly kneaded into a mass. The mixture was extruded through a 16-mesh sieve to granulate, and the mixture was vacuum dried at 50°C and evenly blended with sodium carbonate to obtain a deoxidizer, wherein the mass ratio of tannin to reduced iron powder was 1:10, the mass ratio of reduced iron powder to starch was 1:1, and the mass ratio of tannin to sodium carbonate was 1:1.

[0054] The deoxidation amount of the deoxidizer prepared in Example 5 was measured under 100% RH and 35° C. The results are shown in Table 1.

[0055] Table 1 Deoxygenation amount of each deoxidizer (mL / g) (deoxygenation amount is based on the mass of the deoxidizer)

[0056]

[0057] It can be seen from Table 1 that the deoxidizer prepared by the present invention also has a good deoxidation effect under low humidity conditions (see the data of Example 4). The present invention uses tannin and reduced iron powder as active ingredients, and tannin and reduced iron powder have a synergistic deoxidation effect (the deoxidation amount of 1g tannin and 1g reduced iron powder in Example 2 is 31.8÷2×7=111.3mL, the deoxidation amount of 1g reduced iron powder in Comparative Example 1 is 5.61÷1×6=33.66mL, and the deoxidation amount of 1g tannin in Comparative Example 2 is 7.78÷1×6=46.68mL).

[0058] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A tannin / reduced iron powder deoxidizer, characterized in that: Active ingredients include tannins and reduced iron powder.

2. The tannin / reduced iron powder deoxidizer according to claim 1, characterized in that: The mass ratio of the tannin to the reduced iron powder is 10:1 to 1:

10.

3. A method for preparing the tannin / reduced iron powder deoxidizer according to claim 1 or 2, characterized in that: The following steps are involved: The tannin / reduced iron powder deoxidizer is obtained by mixing tannin, reduced iron powder, adhesive and wetting agent, granulating and drying.

4. The preparation method according to claim 3, characterized in that: The mass ratio of the reduced iron powder to the binder is 1:1-20.

5. The preparation method according to claim 3, characterized in that: The tannin and the reduced iron powder are sieved through a 100-mesh sieve before being mixed.

6. A composite deoxidizer, characterized in that: The component comprises the tannin / reduced iron powder deoxidizer according to claim 1 or 2.

7. The composite deoxidizer according to claim 6, characterized in that The components of the composite deoxidizer further include hygroscopic substances and / or alkaline substances.

8. The composite deoxidizer according to claim 7, characterized in that The hygroscopic substance comprises vermiculite; and the alkaline substance comprises sodium carbonate.

9. Use of the tannin / reduced iron powder deoxidizer according to claim 1 or 2 or the composite deoxidizer according to any one of claims 6 to 8 in deoxidation and preservation of food, medicine or precision instruments.

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