Micro-flow method for measuring total nitrogen content of tobacco

A technology of nitrogen content and micro-flow, applied in the field of micro-flow, can solve the problems of peak shape drift, large consumption of reagents, large consumption of reagents, etc., achieve high accuracy and precision, save reagent consumption, and reduce reagent consumption Effect

Active Publication Date: 2017-09-19
YUNNAN TOBACCO QUALITY SUPERVISION MONITORING STATION
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Problems solved by technology

[0004] However, the existing more than 10 kinds of continuous flow analysis methods have exposed some shortcomings in the application: ①The internal diameter of the pump tube and glass coil is too large, which leads to serious diffusion effect in the tube, which makes the baseline too high and the peak shape drift during the sample measurement process. The emergence of instability and other phenomena will

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  • Micro-flow method for measuring total nitrogen content of tobacco
  • Micro-flow method for measuring total nitrogen content of tobacco
  • Micro-flow method for measuring total nitrogen content of tobacco

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Embodiment 1

[0042] 1 Experimental reagents, instruments and methods

[0043] 1.1 Main instruments and reagents

[0044] Tobacco component analysis standard substance GBW08514 (purchased from the National Tobacco Quality Inspection Center), Burley tobacco, oriental tobacco, flue-cured tobacco and cigarette samples were all from the raw material room of China Tobacco Yunnan Technology Center, and the thin slices were produced by China Tobacco Yunnan Reconstituted Tobacco Leaf Co., Ltd.

[0045] Sulfuric acid (98%), sodium chloride (NaCl), potassium sulfate (K 2 SO 4 ), copper sulfate (CuSO 4 ), potassium sodium tartrate tetrahydrate (KNaC 4 h 4 o 6 4H 2 O), disodium hydrogen phosphate (Na 2 HPO 4 12H 2 O), sodium hydroxide (NaOH), sodium salicylate (NaC 7 h 5 o 3 ), sodium nitroferricyanide (Na 2 Fe(CN) 5 NO·5H 2 O), sodium dichloroisocyanurate (C 3 Cl 2 N 3 o 3 Na), sodium hypochlorite (NaClO), all of the above reagents were of analytical grade, purchased from Guangzhou...

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Abstract

The invention discloses a micro-flow method for measuring total nitrogen content of tobacco. The flow path structure and process parameters of a conventional continuous flow analyzer are modified, including: arranging an air accelerating pipe, changing the inner diameter of a glass coil, changing the inner diameter and flow rate of a pump pipe and adopting a novel reagent preparation method, so that performance optimization is realized, and the using amount of the reagent is saved to the maximum extent. The method runs stably, and the problems of baseline raising, peak pattern drifting and the like do not occur after 60 cups of samples are fed at one time. The micro-flow method has the advantages of high analysis speed (60 samples per hour), high accuracy and high precision, contributes to reduction of reagent consumption, and is suitable for measuring total nitrogen in tobacco and tobacco products on a large scale.

Description

technical field [0001] The invention belongs to the technical field of tobacco chemical component detection, and in particular relates to a micro-flow method for rapidly and accurately detecting the total nitrogen content in tobacco and its products by using a continuous flow analyzer. Background technique [0002] The total nitrogen content in tobacco is one of the important indicators of tobacco quality evaluation, and has a great influence on the sensory quality of cigarettes. When the total nitrogen content is high, the smoke tends to be more irritating and the aroma quality is poor, while when the total nitrogen content is low, the smoke is generally not strong enough. There is also a close correlation between the total nitrogen content in tobacco and other nitrogen-containing compounds. Therefore, accurate determination of the total nitrogen content in tobacco is of great significance for understanding the characteristics of nitrogen-containing compounds and controllin...

Claims

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Application Information

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IPC IPC(8): G01N35/00
CPCG01N35/00
Inventor 王春琼彭丽娟李苓王淑华张燕陈丹李素华
Owner YUNNAN TOBACCO QUALITY SUPERVISION MONITORING STATION
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