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Preparation method of nano lignin particle with uvioresistant effect

A technology of nano-particles and lignin, which is applied in the field of preparation of nano-lignin particles, can solve problems such as skin side effects, and achieve the effects of low cost of use, easy control of product performance, and easy recycling

Inactive Publication Date: 2018-08-21
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long-term use of chemical sunscreen and may cause some side effects on the skin

Method used

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  • Preparation method of nano lignin particle with uvioresistant effect
  • Preparation method of nano lignin particle with uvioresistant effect
  • Preparation method of nano lignin particle with uvioresistant effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Get particle size and be 20~80 purpose bamboo powders, 20g bamboo powders are mixed with 200g 95% acetic acid, then add 1% hydrogen peroxide and 1% hydrochloric acid, put into round bottom flask. Under normal pressure and a stirring speed of 300 rpm, the above solid-liquid mixture was heated from room temperature to 118 °C at a heating rate of 5 °C / min and kept for 2 hours, then naturally cooled to room temperature to obtain a reaction mixture.

[0022] (2) The above reaction mixture was filtered, washed with 95% acetic acid solvent, and the filtrate was collected. The filtrate was concentrated to 20ml by evaporation under reduced pressure. While stirring, the filtrate was added to 200 mL of acidic water (adjusted to pH=2 with hydrochloric acid), centrifuged to precipitate a solid, which was washed with water and freeze-dried at -50°C to obtain lignin.

[0023] (3) The above lignin was dissolved in tetrahydrofuran at a concentration of 10 mg / ml. The solution was p...

Embodiment 2

[0029] (1) Get particle size and be 20~80 mesh bamboo powders, 20g bamboo powders are mixed with 200g 88% formic acid, then add 1% hydrogen peroxide, put into round bottom flask. Under normal pressure and a stirring speed of 300 rpm, the above solid-liquid mixture was heated from room temperature to 100 °C at a heating rate of 5 °C / min and kept for 2 hours, and then naturally cooled to room temperature to obtain a reaction mixture.

[0030] (2) The above reaction mixture was filtered, washed with 88% formic acid solvent, and the filtrate was collected. The filtrate was concentrated to about 20ml by evaporation under reduced pressure. While stirring, the filtrate was added to 200ml of acidic water (adjusted to pH=2 with hydrochloric acid), and centrifuged to obtain a solid, which was washed with water and freeze-dried at -50°C to obtain lignin.

[0031] (3) The above lignin was dissolved in tetrahydrofuran at a concentration of 10 mg / ml. The solution was put into a dialysis b...

Embodiment 3

[0037] (1) Get particle size and be 20~80 mesh bamboo powders, 20g bamboo powders and 200g 88% formic acid are mixed, put into the round bottom flask. Under normal pressure and a stirring speed of 300 rpm, the above solid-liquid mixture was heated from room temperature to 100 °C at a heating rate of 5 °C / min and kept for 2 hours, and then naturally cooled to room temperature to obtain a reaction mixture.

[0038] (2) The above reaction mixture was filtered, washed with 88% formic acid solvent, and the filtrate was collected. The filtrate was concentrated to about 20ml by evaporation under reduced pressure. While stirring, the filtrate was added to 200ml of acidic water (adjusted to pH=2 with hydrochloric acid), and centrifuged to obtain a solid, which was washed with water and freeze-dried at -50°C to obtain lignin.

[0039] (3) The above lignin was dissolved in tetrahydrofuran at a concentration of 10 mg / ml. The solution was put into a dialysis bag with a molecular weight c...

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Abstract

The invention relates to a preparation method and an application of an uvioresistant nano lignin particle and belongs to the field of lignin nano particle preparation. The method comprises the steps of taking bamboo powder as a raw material, performing mild separation via an organic solvent, and performing dialysis on extracted lignin to form the lignin nano particle. The method has the advantagesthat the method is simple in operation process and mild in reaction condition, and the product performance is easy to control; and the particle can be used for the field of cosmetic sun protection and has a good use value and utilization prospects. A sun protection factor of a cream in which 5% of lignin nano particle is added is increased threefold, and the efficient utilization of a lignin resource is achieved.

Description

technical field [0001] The invention belongs to the field of lignin nanoparticle preparation, and relates to a preparation method of nanometer lignin particle with anti-ultraviolet effect. technical background [0002] Prolonged exposure to sunlight can cause damage to the eyes, skin, and immune system, among other things. Ultraviolet radiation can be divided into three categories according to wavelength: UVA (320-420nm), UVB (290-320nm) and UVC (200-290nm). Due to the shielding effect of the earth's ozone layer, UVC does not penetrate the atmosphere. However, UVB and UVA can not only penetrate the ozone layer, but also damage the epidermis of the skin, and UVA can also reach the dermis and subcutaneous tissue. Under ultraviolet radiation, molecular oxygen in the skin will form various free radical compounds, causing skin damage, such as skin aging, darkening of pigment, and even skin cancer. Therefore, skin sun protection is of great significance. According to the prote...

Claims

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Application Information

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IPC IPC(8): A61K8/72A61K8/02A61Q17/04
CPCA61K8/0245A61K8/72A61K2800/413A61K2800/84A61Q17/04
Inventor 李明飞李淑娴吴小菲
Owner BEIJING FORESTRY UNIVERSITY
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