Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Measuring method for crystallinity and crystalline state structure of tobacco cellulose

A technology of tobacco cellulose and determination method, which is applied in the field of determination of crystallinity and crystalline structure, and can solve the problems of poor measurement accuracy, unreported structure and crystallinity analysis, and large differences in chemical properties.

Active Publication Date: 2015-03-25
CHINA TOBACCO SICHUAN IND CO LTD +1
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the XRD method is widely used (Nicoleta Terinte, Roger Ibbett, Kurt Christian Schuster. OVERVIEW ON NATIVE CELLULOSE AND MICROCRYSTALLINE CELLULOSE I STRUCTURE STUDIED BY X-RAY DIFFRACTION (WAXD): COMPARISON BETWEENMEASUREMENT TECHNIQUES. Lenzinger Berichte: 211118, .), its advantage is that the pretreatment is simple, but the measurement accuracy is not as good as CP / MAS 13 C-NMR method, and cannot quantitatively reflect the crystalline structure of cellulose; FTIR measurement results are significantly higher than other methods due to more interfering substances; Raman spectroscopy needs to be measured in alkaline solution, and the results will be affected by the concentration of alkali ;Combined CP / MAS method 13 Compared with the first three methods, C-NMR can obtain all the information of cellulose microstructure more completely and accurately, and it has been applied in the research of papermaking fibers in recent years, such as Xiao Qing et al. (Xiao Qing, Wan Jinquan, Wang Yan. CP / Research on the microstructure of wood pulp fibers by MAS 13C-NMR technology [J]. Acta Chemica Sinica, 2009, 67(22): 2629-2634.) This method was used to study and explore eucalyptus wood chips. Complicated pretreatment process, and need to remove lignin to measure
[0007] The research on cellulose in tobacco is limited to the determination of cellulose content, but there is no report on the analysis of its structure and crystallinity
Moreover, the physical and chemical properties of tobacco and eucalyptus are quite different, and the application of CP / MAS 13 It is still blank to study the crystallinity and crystal structure of tobacco cellulose by C-NMR method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Measuring method for crystallinity and crystalline state structure of tobacco cellulose
  • Measuring method for crystallinity and crystalline state structure of tobacco cellulose
  • Measuring method for crystallinity and crystalline state structure of tobacco cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Selection of flue-cured tobacco samples from Guizhou C 3 F is processed according to the aforementioned step A to obtain a reference standard sample of flue-cured tobacco cellulose, and the cellulose content of the reference standard sample of flue-cured tobacco cellulose is 9.84%. Obtain the non-cellulose absorption background spectrum of the flue-cured tobacco sample according to the aforementioned step B. Then select the flue-cured tobacco sample to be tested for detection according to the aforementioned steps C to D, and compare the results with the previous XRD method and IR method. The crystallinity of the flue-cured tobacco sample to be tested is shown in Table 1.

[0085] Table 1: Crystallinity of cellulose in different flue-cured tobacco samples

[0086]

[0087]

[0088] Note: * is obtained from the formula for calculating the area of ​​crystal region and amorphous region by NMR method;

[0089] **for 13 C NMR spectrum fitted by cellulose crystal form...

Embodiment 2

[0098] The Hunan oriental tobacco sample was selected and processed according to the aforementioned step A to obtain a reference standard sample of oriental tobacco cellulose, and the cellulose content of the reference standard sample of oriental tobacco cellulose was 11.12%. Obtain the non-cellulose absorption background spectrum of the oriental tobacco sample according to the aforementioned step B. Then, the Hunan oriental tobacco samples were tested according to the aforementioned steps C to D, and compared with the detection results of the previous XRD method and IR method. The crystallinity of the oriental tobacco samples to be tested is shown in Table 4.

[0099] Table 4: Crystallinity of Oriented Tobacco Sample Cellulose

[0100]

[0101] Note: * is obtained from the formula for calculating the area of ​​crystallized region and amorphous region by NMR method;

[0102] **for 13 C NMR spectrum fitted by cellulose crystal form I α , I α+β and I β and the sum of the...

Embodiment 3

[0111] The Hubei burley tobacco sample was selected and processed according to the aforementioned step A to obtain a burley tobacco cellulose reference standard sample, and the cellulose content of the burley tobacco cellulose reference standard sample was 14.95%. The non-cellulose absorption background spectrum of the Burley tobacco sample was obtained according to the previous step B. Then the Hunan Burley tobacco samples were tested according to the aforementioned steps C to D, and compared with the previous XRD and IR method detection results, the crystallinity of the Burley tobacco samples to be tested is shown in Table 7.

[0112] Table 7: Crystallinity of Burley tobacco sample cellulose

[0113]

[0114]

[0115] Note: * is obtained from the formula for calculating the area of ​​crystallized region and amorphous region by NMR method;

[0116] **for 13 C NMR spectrum fitted by cellulose crystal form I α , I α+β and I β and the sum of the relative content of su...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a measuring method for crystallinity and crystalline state structure of tobacco cellulose. The measuring method adopts a CP / MAS <13>C-NMR method to conduct detection on a tobacco sample, and then measures the crystallinity and the crystalline state structure of the cellulose in the tobacco sample. The pretreatment of the tobacco sample is that elution is conducted with an acid washing agent, lignose is eluted without the strong oxidant sub-oxygen acid sodium, alkali and acid treatments are conducted, the pretreatment is simple in process and short in time consumption, and when data processing is adopted, interference of lignose is removed through the manner of respectively deducting corresponding noncellulosic background absorption on various types of tobacco samples. According to the method, research on tobacco cellulose sample fibril structure extracted by an acidic washing agent is realized, and important theoretical bases can be provided for cellulose modification, tobacco processing, low-grade tobacco leaf and tobacco stem treatment and the like.

Description

【Technical field】 [0001] The invention belongs to the field of tobacco science, and in particular relates to a method for measuring the crystallinity and crystal structure of tobacco cellulose. 【Background technique】 [0002] Cellulose is the basic substance that constitutes the cell tissue and skeleton of tobacco leaves, and its content has a great influence on the processing performance, combustibility and smoking quality of tobacco; in the process of tobacco processing, the changes in the crystal structure and crystallinity of cellulose macromolecules Factors such as tobacco swelling and moisture absorption properties and flexibility and other qualities have an important impact. Therefore, strengthening the research on tobacco cellulose is of great significance for improving the quality of cigarette processing. [0003] Cellulose macromolecules are linear macromolecules composed of glucose groups connected by β-1,4 glycosidic bonds to cellobiose units, and then to form h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N24/08
Inventor 谭兰兰戴亚冯广林李东亮江长国朱晓兰
Owner CHINA TOBACCO SICHUAN IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com