Micro-flow method for measuring total nitrogen content of tobacco

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...

AI Technical Summary

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 affect the accuracy of the measurement results; ②The high flow rate in the tube makes the consumption of reagents large, and consumes a large amount of reagents when a large number of samples are injected, which increases the workload of reagent preparation for staff

These defects have been puzzling the researchers of the tobacco quality inspection agency, but there is still no good solution in the prior art

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