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Lignin nano-particles with high ultraviolet protection performance and preparation method of lignin nano-particle

A technology of nanoparticles and protection performance, which is applied in the field of lignin nanoparticles with high UV protection performance and its preparation. It can solve the problems of weakening the UV absorption performance of lignin, which is not conducive to human health, and sacrificing anti-oxidation performance, and achieves excellent UV protection performance. Good protection performance, good UV protection performance, green and environmental protection effect in the preparation process

Inactive Publication Date: 2017-02-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, tetrahydrofuran is carcinogenic and is not conducive to human health; on the other hand, acetylation modification occurs on the phenolic hydroxyl of lignin, and the replacement of phenolic hydroxyl weakens the UV absorption performance of lignin, while sacrificing the excellent lignin. antioxidant properties

Method used

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  • Lignin nano-particles with high ultraviolet protection performance and preparation method of lignin nano-particle
  • Lignin nano-particles with high ultraviolet protection performance and preparation method of lignin nano-particle
  • Lignin nano-particles with high ultraviolet protection performance and preparation method of lignin nano-particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037](1) Put 0.01g of solvent-based lignin in a 1000mL beaker, add 100mL of acetone / water mixture (the volume ratio of acetone to water is 4:1), stir and dissolve at room temperature to obtain a 0.1g / L lignin solution .

[0038] (2) Slowly add 300 mL of water to the lignin solution obtained in step (1), stir under normal temperature and pressure to form spherical micelles, and obtain a suspension containing small-sized lignin nanoparticles. The suspension was rotary evaporated and then dried to obtain small-sized lignin nanoparticles. figure 1 It is a scanning electron microscope picture of the small-sized lignin nano-particles of the product of this example taken by a Nova NanoSEM 430 scanning electron microscope in the Netherlands, showing that the particles are solid spherical structures with a diameter of about 50 nm. figure 2 It is the particle size distribution diagram of the small-sized lignin nanoparticles of the product of this embodiment measured by the German ALV...

Embodiment 2

[0044] (1) Put 1 g of solvent-based lignin in a 1000 mL beaker, add 100 mL of acetone / water mixture (the volume ratio of acetone to water is 4:1), stir and dissolve at room temperature to obtain a 10 g / L lignin solution.

[0045] (2) Slowly add 300 mL of water to the lignin solution obtained in step (1), stir at normal temperature and pressure to form spherical micelles, and obtain a suspension containing medium-sized lignin nanoparticles. The suspension was rotary evaporated and then dried to obtain medium-sized lignin nanoparticles. The particle size distribution and surface morphology of the lignin nanoparticles are tested by the same light scattering and scanning electron microscope test method as in Example 1, which shows that the hydrodynamic radius of the gained nanoparticles is 100-300nm, such as image 3 , Figure 4 shown.

[0046] Mix the product of this example with a blank cream that has no sunscreen effect at a mass fraction of 5% and 10%, and at the same time c...

Embodiment 3

[0051] (1) Put 0.03g of enzymatic lignin in a 1000mL beaker, add 100mL of acetone / water mixture (the volume ratio of acetone to water is 5:1), stir and dissolve at room temperature to obtain a 0.3g / L lignin solution .

[0052] (2) Slowly add 300 mL of water to the lignin solution obtained in step (1), stir under normal temperature and pressure to form spherical micelles, and obtain a suspension containing small-sized lignin nanoparticles. The suspension was rotary evaporated and then freeze-dried to obtain small-sized lignin nanoparticles. The morphology and particle size distribution of the lignin nanoparticles were tested using the same scanning electron microscope and light scattering as in Example 1, which showed that the hydrodynamic radius of the obtained nanoparticles was 35-75 nm. respectively with figure 1 , figure 2 basically the same.

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Abstract

The invention belongs to the technical field of preparation of nano-materials, and discloses lignin nano-particles with high ultraviolet protection performance and a preparation method and application of the lignin nano-particles. The preparation method comprises the following steps: (1) dissolving 0.1-50 parts by weight of lignin in 1,000-2,000 parts by weight of an acetone / water mixed solvent to obtain a lignin organic solution; and (2) mixing the lignin organic solution in the step (1) with 1,000-4,000 parts by weight of water, and stirring to obtain the lignin nano-particles. The hydrodynamic radius of the lignin nano-particles is 50-300 nm, the lignin nano-particles are solid spherical particles of which hydrophilic groups are positioned externally and hydrophobic groups are positioned internally, the number of phenolic hydroxyl groups distributed on the unit area is large, the ultraviolet protection performance is the best, and the oxidation resistance is the most excellent. The size is controllable, the field of large-scale and high-value application of the lignin is expanded, and particularly, the lignin nano-particles which are used as ultraviolet protecting agents have huge application prospect in the field of high-end daily chemical products such as sun block and skin care.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a lignin nanoparticle with high ultraviolet protection performance and a preparation method and application thereof. Background technique [0002] In recent years, due to the continuous destruction of the ozone layer, the amount of ultraviolet radiation reaching the earth's surface has continued to increase. Generally speaking, there are two types of ultraviolet rays that can pass through the ozone layer and reach the surface of the earth: UVB region (280-320nm) and UVA region (320-400nm). Ultraviolet rays in the UVB area will directly sunburn the skin, while ultraviolet rays in the UVA area have cumulative damage to the skin. Long-term exposure can cause skin aging and even skin cancer. Long-term ultraviolet radiation will cause great damage to human skin, so sun protection and skin care are urgent. [0003] Commonly used sunscreens are generally d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/72A61K8/02A61Q17/04
CPCA61Q17/04A61K8/025A61K8/72A61K2800/413A61K2800/805
Inventor 邱学青钱勇钟晓雯朱世平杨东杰
Owner SOUTH CHINA UNIV OF TECH
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