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Xanthan gum- azo-vinyl pyrrolidone graft copolymer and preparation method and application thereof

A technology of azovinylpyrrolidone and vinylpyrrolidone, which is applied to xanthan gum-azovinylpyrrolidone graft copolymer and its preparation and application fields, can solve the problem of high cost, achieve rapid reaction, simple operation and regulation, and grafting uniform effect

Inactive Publication Date: 2012-07-04
INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its polymerization or cross-linked product polyvinylpyrrolidone (PVP) and cross-linked polyvinylpyrrolidone (PVPP) can effectively remove polyphenols in beer, tea and fruit juice, and are good adsorption materials, but using NVP alone The production of insoluble PVP and PVPP (molecular weight must be at least greater than 40,000) requires a large amount of monomer substances, and the cost is high

Method used

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  • Xanthan gum- azo-vinyl pyrrolidone graft copolymer and preparation method and application thereof
  • Xanthan gum- azo-vinyl pyrrolidone graft copolymer and preparation method and application thereof
  • Xanthan gum- azo-vinyl pyrrolidone graft copolymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, the preparation of xanthan gum-nitrogen vinyl pyrrolidone graft copolymer (XG-g-NVP)

[0032] 1) The effect of irradiation dose on the grafting rate of XG-g-NVP (the dosage ratio of xanthan gum to water is 6g:1L, the mass ratio of NVP to XG is 8:1)

[0033] Add 250ml of double distilled water into a 500ml solvent bottle, accurately measure 12g of nitrogen vinylpyrrolidone (NVP) into the above bottle, mix and shake well. Weigh 1.5g xanthan gum (XG) (n is 2000-20000), add a small amount to the bottle several times, shake to dissolve, let it stand for 30min, and pour in N 2 After 20min, use 60The co-radiation grafting treatment of Co-γ radiation source (irradiation is carried out in the irradiation center of Institute of Atomic Energy Utilization, Chinese Academy of Agricultural Sciences), the doses are respectively 4, 6, 8, 10, 12 and 16 kGy, and the dose rate is 0.5 kGy / h. The sample was vacuum freeze-dried to obtain the crude product of xanthan gum-nit...

Embodiment 2

[0050] Embodiment 2, the preparation of xanthan gum-nitrovinyl pyrrolidone graft copolymer (XG-g-NVP)

[0051] Add 250ml of double distilled water into a 500ml solvent bottle, accurately measure 12g of nitrogen vinylpyrrolidone (NVP) into the above bottle, mix and shake well. Weigh 2.5g of xanthan gum (XG) (n is 2000~20000), add a small amount to the bottle several times, shake to dissolve, let it stand for 30min, and inject N 2 After 20min, use 60 The Co-γ radiation source was subjected to co-radiation grafting treatment (irradiation was carried out at the Irradiation Center of the Institute of Atomic Energy Utilization, Chinese Academy of Agricultural Sciences), with an irradiation dose of 10 kGy and a dose rate of 0.5 kGy / h. The sample was vacuum freeze-dried to obtain the crude product of xanthan gum-nitrovinylpyrrolidone graft copolymer (XG-g-NVP) provided by the present invention. Use 95% ethanol to carry out Soxhlet extraction of the graft copolymer crude product for ...

Embodiment 3

[0053] Example 3. Analysis of the adsorption characteristics of XG-g-NVP to phenol and tea polyphenols:

[0054] 1. Standard curve of phenol and tea polyphenols

[0055] 1) Drawing of phenol standard curve and tea polyphenol standard curve

[0056] (1) Phenol standard curve: Accurately weigh 1.000g of phenol and dissolve it in double distilled water, dilute it to 100ml, and make it into a 10mg / ml solution. Take 1.25ml of this solution and dilute it to 250ml (50μg / ml use solution). Use liquid 2.5, 5.0, 7.5, 10.0, 12.5, 15, 17.5 and 20ml solution to dilute to 25ml with 0.1mol / ml NaOH solution, and the phenol concentration is 5, 10, 15, 20, 25, 30, 35 and 40μg / ml. Using a 1cm cuvette at a wavelength of 287nm with NaOH solution as a blank, measure the absorbance value A of different concentrations of phenol (Fang Xinghua et al., 2000; Lie Zhimin, 1984). Take the absorbance value as the ordinate, and take the phenol concentration as the abscissa to draw a standard curve, and th...

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Abstract

The invention discloses xanthan gum- azo-vinyl pyrrolidone graft copolymer and a preparation method and application thereof. The preparation method includes the following steps: evenly mixing N-vinyl pyrrolidone and xanthan gum in solvent, conducting irradiation on the mixture through gama ray produced by radioactive substances to obtain the xanthan gum- azo-vinyl pyrrolidone graft copolymer. In the method, the irradiation dose is 4-16 kGy, preferably 8-10 kGy, and more preferably 10kGy; mass ratio of the N- vinyl pyrrolidone and the xanthan gum is 2-14:1, preferably 8-10:1, and more preferably 10:1; dosage ratio of the xanthan gum and the solvent is 4-14g:1L, preferably 8-12g:1L, more preferably 10g:1L. The graft copolymer obtained in the method has high adsorption capability to both phenol and tea polyphenol and has important application value.

Description

technical field [0001] The invention relates to xanthan gum-nitrovinyl pyrrolidone graft copolymer and its preparation method and application. Background technique [0002] Phenol (phenol) is an important chemical raw material, which is widely used in papermaking, oil refining, plastics, pesticides, pharmaceutical synthesis and other industries, so it is also a common pollutant in water (Gao Xiaolei et al., 2006). Phenol is extremely toxic and can denature and precipitate proteins in organisms, causing tissue damage and necrosis, thereby poisoning organisms. Due to its high toxicity, phenol has been listed as a priority pollutant by my country's environmental protection department and the United States Environmental Protection Agency (Sabio, et al., 2001). The treatment of phenol-containing wastewater has always been one of the hot topics in environmental protection research. At present, the treatment methods of phenol-containing wastewater mainly include extraction method,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F226/10C08F2/46B01J20/26B01J20/30C02F1/28C02F101/34
Inventor 哈益明王锋李彦杰范蓓李庆鹏李伟明周洪杰
Owner INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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