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Nondestructive testing method for rapid discrimination of sulphur-fumigated traditional Chinese medicinal materials by using gas sensors and application of gas sensors

A gas sensor, sulfur fumigation technology, applied in the direction of material resistance, etc., can solve the problems of inability to evaluate the integrity of the sample objectively, ineffective containment, long analysis cycle, etc., and achieve objective identification results, simple operation, and fast analysis speed. Effect

Inactive Publication Date: 2013-10-09
NANJING UNIVERSITY OF TRADITIONAL CHINESE MEDICINE
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AI Technical Summary

Problems solved by technology

These methods are subjective, cumbersome to operate, have a long analysis period, are destructive to the sample, and cannot quickly and objectively evaluate the integrity of the sample, so they cannot effectively curb the abuse of sulfur by unscrupulous merchants and manufacturers in the treatment of Chinese herbal medicines. The practice of fumigation

Method used

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  • Nondestructive testing method for rapid discrimination of sulphur-fumigated traditional Chinese medicinal materials by using gas sensors and application of gas sensors
  • Nondestructive testing method for rapid discrimination of sulphur-fumigated traditional Chinese medicinal materials by using gas sensors and application of gas sensors
  • Nondestructive testing method for rapid discrimination of sulphur-fumigated traditional Chinese medicinal materials by using gas sensors and application of gas sensors

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composition of 10 sensors and their main applications of the portable PEN3 standard sensor array of the German AIRSENSE company are shown in Table 1:

[0029] Table 1 Electronic nose PEN3 standard sensor array and its main applications

[0030]

[0031]

[0032] 1) Weigh 20g of 20 batches of angelica samples (among them, batches 1-8 are non-sulfur-smoked angelica, and batches 9-20 are sulfur-smoked angelica), place them in 50mL beakers, seal them with tin foil, and put them at a temperature of 25°C Stand in the headspace for 10 minutes;

[0033] 2) After the headspace gas reaches equilibrium, the headspace sample is introduced into the sensor array reaction chamber for sampling. The sampling time is 60s. The sensor array reacts with the headspace gas to obtain a response signal; the sensor response signal is the conductivity of the sensor after it contacts the headspace gas. G and the conductivity G of the sensor passing through clean air 0 The ratio of G / G ...

Embodiment 2

[0040] 1) Weigh 20g of 20 batches of honeysuckle samples (of which 1-8 batches are non-sulfur-smoked honeysuckle, and 9-20 batches are sulfur-smoked honeysuckle), place them in 50mL beakers, seal them with tin foil, and put them at a temperature of 25°C Stand in the headspace for 10 minutes;

[0041] 2) After the headspace gas reaches equilibrium, the headspace sample is introduced into the sensor array reaction chamber for sampling. The sampling time is 60s. The sensor array reacts with the headspace gas to obtain a response signal; the sensor response signal is the conductivity of the sensor after it contacts the headspace gas. G and the conductivity G of the sensor passing through clean air 0 The ratio of G / G 0 , the resistance ratio (G / G 0 ) changes with the detection time; the sample interval time is 150s, the sample preparation time is 5s, the sensor cleaning time is 80s, the automatic zeroing time is 5s, and the carrier gas flow rate is 300mL / min;

[0042] 3) Extract...

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Abstract

The invention discloses a method for rapid nondestructive testing of sulphur-fumigated traditional Chinese medicinal materials by using gas sensors, which belongs to the field of nondestructive testing of authenticity and quality of traditional Chinese medicinal materials and decoction pieces. According to the invention, No. 7 sensor and No. 9 sensor of the gas sensors are mainly used for response to sulfide and organic sulfur compounds; sulphur-fumigated medicinal materials have greater response degrees compared with non-sulphur-fumigated medicinal materials; a principal component analysis method and a linear discriminant analysis method are adopted for stoichiometric analysis of a matrix of response signals of the sensors, and analysis results are used as discrimination bases. The method provided by the invention can rapidly and nondestructively test whether Chinese angelica has undergone sulphur fumigation, effectively avoids subjectivity of smell judgment during discrimination of properties of traditional Chinese medicines and has the advantages of simple sample pretreatment process, short analysis time, a fast speed, high sensitivity, etc.

Description

technical field [0001] The invention belongs to the technical field of detecting the quality of Chinese medicinal materials and decoction pieces, and in particular relates to a nondestructive detection method and application of a gas sensor for quickly identifying sulfur-fumigated Chinese medicinal materials. Background technique [0002] In the past ten years, many unscrupulous businessmen have pursued the color of Chinese herbal medicines one-sidedly, excessively used sulfur fumigation, advanced fumigation, and repeated fumigations, resulting in a large amount of sulfur dioxide residues, and because of its cheap and easy-to-obtain raw materials, it has even been used by many Chinese medicine production and processing enterprises. According to reports, if the amount of sulfur dioxide in Chinese herbal medicines exceeds 0.05%, it will produce an unpleasant taste. In addition, excessive sulfur dioxide residues can cause damage to the stomach, liver, kidneys, and immune system...

Claims

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Application Information

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IPC IPC(8): G01N27/04
Inventor 蔡皓娄雅静张科卫刘晓曹岗屠康
Owner NANJING UNIVERSITY OF TRADITIONAL CHINESE MEDICINE
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