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
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  • 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 microstruct...

Method used

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  • 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...

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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

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Application Information

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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
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