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Lignin with high biological activity and preparation method thereof

A technology of lignin and nano-lignin is applied in the field of broad-spectrum antibacterial, anti-ultraviolet lignin and its preparation, and high anti-oxidation, which can solve the problem that it does not have broad-spectrum antibacterial function, and the ultraviolet shielding performance and antibacterial activity are not substantially improved. , The antioxidant capacity and UV shielding capacity of lignin have not been substantially improved, etc., to achieve the effect of improved UV shielding performance, excellent antioxidant performance, and excellent UV shielding function

Inactive Publication Date: 2021-11-26
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Documents Ind.Crops Prod.2019,128,177–185, ACS Sustainable Chem.Eng.2018,6(2),2591–2595 and Ind.Crops Prod.2017,95,512–520 were depolymerized by hydrothermal method, laccase and Ionic liquid modification improves the antioxidant performance of lignin, but the UV shielding performance and antibacterial activity have not been substantially improved; the literature Green Chem., 2020, 22, 6357-6371 reported that arginine, histidine and lysine Amino acids are grafted onto the surface of lignin, which improves the antibacterial activity of lignin. Although the modified lignin product has selective antibacterial effect on Gram-positive bacteria and negative bacteria, it does not have broad-spectrum antibacterial function, and the lignin Antioxidant ability and UV shielding ability have not been substantially improved

Method used

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  • Lignin with high biological activity and preparation method thereof
  • Lignin with high biological activity and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] Nano lignin (100 parts, one part by mass 0.01g) and ethylenediamine (10 parts) are added in the reaction flask, N 2 As a protective gas, formaldehyde (10 parts) and TiO were slowly added dropwise at 60 °C 2 The dispersion (0.1 part) was subjected to Mannich reaction, and dialyzed after 10 hours of reaction to obtain aminated modified lignin. The product is referred to as T-LNP1. Its antioxidant activity is shown in Table 1, and its antibacterial activity is shown in Table 2. , UV shielding properties are shown in Table 3.

Embodiment 2

[0038]Nano lignin (100 parts) and ethylenediamine (50 parts) are added in the reaction bottle, N 2 As a protective gas, formaldehyde (50 parts) and TiO were slowly added dropwise at 100 °C 2 Dispersion liquid (0.5 part) carries out Mannich reaction, and dialysis is carried out after 1h reaction finishes, can obtain aminated modified lignin, and the product is called T-LNP2 for short, and its antioxidant activity is shown in Table 1, and antibacterial activity is shown in Table 2 , UV shielding properties are shown in Table 3.

Embodiment 3

[0040] Add nano-lignin (100 parts) and dihydroxyethylamine (50 parts) into the reaction flask, N 2 As a protective gas, glutaraldehyde (50 parts) and TiO were slowly added dropwise at 100 °C 2 Dispersion liquid (2 parts) carries out Mannich reaction, carries out dialysis after 1h reaction finishes, can obtain aminated modified lignin, product is called for short T-LNP3, and its antioxidant activity is shown in Table 1, antibacterial activity is shown in Table 2, The UV shielding properties are shown in Table 3.

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Abstract

The invention provides a method for preparing amination modified lignin with high biological activity by taking nano lignin (LNP) as a raw material. The raw materials comprise 10 to 50 parts of nano lignin, 10 to 50 parts of an amino compound, 10 to 50 parts of an aldehyde compound and 0.1 to 2 parts of titanium dioxide (TiO2). The method comprises the following steps: mixing lignin and an amino compound according to a certain ratio, magnetically stirring at normal temperature, dispersing an aldehyde compound and TiO2 / water, uniformly mixing in a dropwise adding manner, and carrying out Mannich reaction under the conditions of 60-100 DEG C, inert gas protection and the like. The method is simple in process, short in preparation period and high in yield. Compared with a commercial antioxidant, the amination modified high-activity lignin prepared from lignin has the advantages that the free radical scavenging performance is remarkably improved, and the amination modified high-activity lignin has excellent synergistic ultraviolet shielding performance and antibacterial activity and can be applied to the fields of cosmetics, personal care products, biological pharmacy, polymer composite materials and the like.

Description

technical field [0001] The invention belongs to the field of environment-friendly natural polymer materials, and relates to a lignin with high anti-oxidation, broad-spectrum antibacterial, anti-ultraviolet and a preparation method thereof. Background technique [0002] With the improvement of the quality of life, antioxidants play an increasingly important role in human diet and daily life. The addition of antioxidant functional substances, such as butylated hydroxytoluene (BHT), tert-butyl p-hydroxyanisole (BHA), etc., can delay the aging speed of the body and maintain the health of the body. Medical research shows that the primary occurrence of human chronic diseases is caused by the robbing of cell electrons, and free radicals can easily rob cell electrons after entering the human body, resulting in reduced cell resistance, the body is susceptible to bacterial infection, and even forms carcinogens. Therefore, antioxidant scavenging free radicals has always been a researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 毛志慧齐国闯马丕明杨伟军
Owner JIANGNAN UNIV
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