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Method for Measuring Moisture Content of Tobacco by Low Field NMR

A low-field nuclear magnetic resonance and water content technology, applied in the direction of analysis using nuclear magnetic resonance, can solve the problems of cumbersome operation, consumption of reagents, complicated sample pretreatment process, etc., and achieve accurate test results, no sample loss, and test speed. quick effect

Active Publication Date: 2016-04-06
ZHENGZHOU TOBACCO RES INST OF CNTC +1
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Problems solved by technology

At present, the common measurement methods of tobacco moisture content mainly include oven method (YC / T31-1996 tobacco and tobacco products sample preparation and moisture determination oven method), Karl Fischer method (GB / T23357-2009 tobacco and tobacco products moisture determination Karl Fischer method) and gas chromatography (Wu Jinming, Peng Bin, Liu Kejian, etc. Determination of tobacco moisture content by gas chromatography. Tobacco Science and Technology [J]. 2012,12,49-51.), but these methods have certain limitations Disadvantages: The oven method takes a long time to measure; the Karl Fischer method consumes more reagents and is cumbersome to operate, and is more suitable for the measurement of trace moisture; the sample pretreatment process of gas chromatography is complicated, and the requirements for solvents are relatively strict

Method used

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  • Method for Measuring Moisture Content of Tobacco by Low Field NMR

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Embodiment Construction

[0016] Below in conjunction with specific embodiment the inventive method is described:

[0017] experiment material

[0018] Finished cigarettes A, B, C, 1 box each, CuSO 4 ·5H 2 O (analytical grade, Tianjin No. 3 Reagent Factory), distilled water, headspace bottle (10ml, Agilent).

[0019] laboratory apparatus

[0020] PQ-001 low-field nuclear magnetic resonance instrument (0.5T, Shanghai Numei Electronic Instrument Co., Ltd., equipped with 25mm coil), balance (electronic balance, BP121S, Sartorius°).

[0021] Preparation of test samples

[0022] 1. Prepare 10% CuSO 4 solution, take CuSO at equal mass intervals 4 The solution standard samples were respectively placed in 6 headspace bottles, sealed for use;

[0023] 2. Before the test, open the packaging boxes of the three finished cigarettes A, B, and C, take out two cigarettes each, weigh part of the shredded tobacco, place them in three headspace bottles, and seal the test.

[0024] Experimental measurement process...

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Abstract

The invention discloses a method for measuring the content of moisture of tobaccos through low-field nuclear magnetic resonance. The method is characterized by comprising the following steps: measuring nuclear magnetic resonance FID signals of a series of CuSO4 solution samples containing different moisture masses, and fitting a standard measurement curve according to the FID signal amount and the corresponding moisture mass of each CuSO4 solution; performing the rapid and accurate measurement on a tobacco sample with the unknown content of the moisture, and converting the FID signal amount of the sample into the moisture mass according to the standard measurement curve, wherein the ratio of the moisture mass to the mass of the tobacco sample is the moisture of a tested sample. The method has the beneficial effects that compared with a conventional testing method, the method is high in testing speed and accurate in testing result, the sample pretreatment process and the sample shape requirement in the testing process are avoided, a solvent is not required to be consumed, the sample loss is avoided, and the environment-friendly testing concept is fully reflected.

Description

technical field [0001] The invention belongs to the field of measuring the moisture content of tobacco by low-field nuclear magnetic resonance, and in particular relates to a method for measuring the moisture content of tobacco by using low-field nuclear magnetic resonance technology. Background technique [0002] Tobacco moisture content is an important factor affecting the sensory quality of cigarettes, the production process and the chemical composition of smoke. At present, the common measurement methods of tobacco moisture content mainly include oven method (YC / T31-1996 tobacco and tobacco products sample preparation and moisture determination oven method), Karl Fischer method (GB / T23357-2009 tobacco and tobacco products moisture determination Karl Fischer method) and gas chromatography (Wu Jinming, Peng Bin, Liu Kejian, etc. Determination of tobacco moisture content by gas chromatography. Tobacco Science and Technology [J]. 2012,12,49-51.), but these methods have certa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
Inventor 马骥崔凯彭桂新马宇平于建春陈芝飞孙志涛芦昶彤宗永立屈展霍现宽何保江
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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