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CN-121988241-A - Composite microcapsule, preparation method thereof and application thereof in tobacco moisture preservation

CN121988241ACN 121988241 ACN121988241 ACN 121988241ACN-121988241-A

Abstract

The invention discloses a composite microcapsule which has a core-shell structure, wherein a core layer is made of tobacco endogenous biological base materials, and a shell layer is made of a composite wall material formed by electrostatic complex coacervation of chitosan and gelatin. The invention also discloses a preparation method of the composite microcapsule and application of the composite microcapsule in tobacco moisture preservation. The composite microcapsule solves the problems of poor long-acting property and strong environmental dependence of the existing moisturizing technology in tobacco moisturizing.

Inventors

  • ZHANG LING
  • YANG QIANXU
  • ZHAO YINGLIANG
  • LI YONG
  • XIA JIANJUN
  • YANG LEI
  • LIU DONG
  • ZHOU GUOFU

Assignees

  • 云南中烟工业有限责任公司

Dates

Publication Date
20260508
Application Date
20260331

Claims (10)

  1. 1. The composite microcapsule is characterized by having a core-shell structure, wherein a core layer is made of a tobacco endogenous biological base material, and a shell layer is a composite wall material formed by electrostatic complex coacervation of chitosan and gelatin.
  2. 2. The composite microcapsule according to claim 1, wherein the composite microcapsule has an average particle size of 1.0-2.0 μm and a Zeta potential absolute value of more than 30 mV.
  3. 3. A method of preparing a composite microcapsule according to any one of claims 1-2, comprising the steps of: (1) Dispersing tobacco endogenous biological base material in water, adding gelatin for dissolution to obtain a mixed solution A; (2) Adding chitosan solution into the mixed solution A, uniformly dispersing, and regulating the pH value to carry out complex coacervation reaction; (3) Reacting for a period of time at a certain temperature to obtain the composite microcapsule emulsion; (4) And (3) centrifugally separating the emulsion, washing, and performing vacuum freeze drying to obtain the composite microcapsule powder.
  4. 4. The preparation method of claim 3, wherein the tobacco endogenous bio-based material is a nano-scale fiber material with biocompatibility, the diameter is less than 100nm, the length is 500nm-10 mu m, the specific surface area is not less than 230m 2 /g, the cytotoxicity is measured by an MTT method, the cell survival rate is not less than 80%, and the Zeta potential is-20 to-40 mV.
  5. 5. The preparation method according to claim 3, wherein the mass ratio of the core layer material to the shell layer material is 1:4-8, and the mass concentration of the shell layer material in the reaction system is 0.5% -2.5%.
  6. 6. The preparation method according to claim 5, wherein the mass ratio of the core layer material to the shell layer material is 1:5, and the mass concentration of the shell layer material in the reaction system is 1.5%.
  7. 7. The process according to claim 3, wherein in the step (1), the gelatin is dissolved at 50 ℃, in the step (2), the chitosan solution is a solution obtained by dissolving 1wt% acetic acid solution, and the pH is adjusted to 7.5 with a sodium hydroxide solution, and in the step (3), the reaction is continued at 50 ℃ for one hour.
  8. 8. Use of a composite microcapsule according to any of claims 1-2 in tobacco moisture preservation.
  9. 9. The use according to claim 8, wherein the composite microcapsules are dispersed in water to form a dispersion, which is sprayed onto the surface of the tobacco product.
  10. 10. The use according to claim 8, wherein the dispersion is sprayed in an amount of 0.5-1.5% of the mass of the tobacco product by the composite microcapsules.

Description

Composite microcapsule, preparation method thereof and application thereof in tobacco moisture preservation Technical Field The invention belongs to the technical field of preparation of tobacco additives and functional materials, and particularly relates to a composite moisturizing microcapsule prepared by using tobacco endogenous biological materials, a preparation method thereof and application thereof in moisturizing in tobacco industry. Background In the tobacco industry, whether it is cut tobacco, reconstituted tobacco or cigar tobacco, a suitable and stable moisture content is a core indicator for ensuring its processability and organoleptic quality. Moisture is not only a "plasticizer" for tobacco products, imparting necessary elasticity and shatter resistance thereto, but also an important carrier for smoke. During the production, processing, storage and transportation of tobacco products, water loss is very easy to occur under the influence of environmental humidity change and processing technology such as silk drying and shredding. On one hand, the loss of water can lead to embrittlement of the tobacco-based material, greatly reduce the mechanical strength, generate a large amount of breakage and dust in the high-speed rolling and packaging process, increase raw material consumption and influence the appearance of the product, and on the other hand, the loss of water is often accompanied with volatilization of aroma substances, so that the aroma quantity of the finished cigarette is insufficient, the miscellaneous gas is increased, the irritation is obviously enhanced, and the sensory experience of consumers is seriously influenced. At present, the widely used moisture-preserving means in the tobacco industry mainly depend on traditional chemical moisture-preserving agents, such as propylene glycol, glycerol, sorbitol and other small molecular polyols. The action mechanism of the humectant mainly depends on that hydroxyl groups in the molecular structure of the humectant form hydrogen bonds with water molecules, and moisture is kept through hygroscopicity. However, the 'passive' moisturizing mode has obvious limitations that firstly, the environment is highly dependent, under the low-humidity dry environment, enough moisture is lack in the air for adsorption, the moisturizing effect is greatly reduced, even reverse water is possibly taken from the inside of tobacco leaves due to osmotic pressure, and secondly, small molecular substances are easy to migrate or volatilize in the long-term storage process, so that long-term moisturizing is difficult to realize, and in order to achieve the ideal effect, the adding amount is often required to be increased, the burning state of tobacco shreds is possibly changed, damp and hot feeling is generated, even peculiar smell caused by chemical combustion is introduced, and the coordination of herbal fragrance of cigarettes is destroyed. The invention is proposed for this purpose. Disclosure of Invention In order to overcome the defects in the prior art, the invention discloses a composite moisturizing microcapsule prepared by using tobacco endogenous biological base materials, a preparation method thereof and application thereof in moisturizing in tobacco industry. The technical scheme of the invention is as follows: The first aspect of the invention discloses a composite microcapsule which has a core-shell structure, wherein a core layer is made of a tobacco endogenous biological base material, and a shell layer is made of a composite wall material formed by electrostatic complex coacervation of chitosan and gelatin. Preferably, the composite microcapsule has an average particle size of 1.0-2.0 μm and a Zeta potential absolute value of greater than 30 mV. The invention discloses a preparation method of the composite microcapsule, which comprises the following steps: (1) Dispersing tobacco endogenous biological base material in water, adding gelatin for dissolution to obtain a mixed solution A; (2) Adding chitosan solution into the mixed solution A, uniformly dispersing, and regulating the pH value to carry out complex coacervation reaction; (3) Reacting for a period of time at a certain temperature to obtain the composite microcapsule emulsion; (4) And (3) centrifugally separating the emulsion, washing, and performing vacuum freeze drying to obtain the composite microcapsule powder. Preferably, the tobacco endogenous biological base material is a nano-scale fiber material with biocompatibility, the diameter of the material is smaller than 100nm, the length of the material is 500nm-10 mu m, the specific surface area of the material is not smaller than 230m 2/g, the cytotoxicity of the material is measured by an MTT method, the cell survival rate is not smaller than 80%, and the Zeta potential is-20 to-40 mV. Preferably, the mass ratio of the core layer material to the shell layer material is 1:4-8, and the mass concentration of the shell layer material in the