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A method for identifying the species of Dalbergia cochinchinensis with minimal damage based on fingerprints

A technology of Dalbergia cochinchinensis and fingerprints, which is applied in the field of wood identification, can solve the problems of complicated process, great difference in function and value, damage to the appearance and use function of wood or furniture, and achieve the effect of accurate identification results

Active Publication Date: 2017-12-12
中山市中广测协同创新中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, different varieties of mahogany have similar appearances, but their functions and values ​​are very different. As a result, cochin rosewood products often appear in the market as shoddy products with other low-grade woods. Therefore, it is necessary to identify the authenticity of cochin rosewood.
[0004] At present, the identification of cochin rosewood is based on the manual identification method of wood characteristics. The technical defects are: ① Professionals are required to take representative samples, the process is complicated and will seriously damage the appearance of furniture, making it difficult to restore the furniture to its original state
②Manual discrimination requires experts to identify wood species, but there are still subjective uncertainties, and misjudgment will inevitably occur
③The identification result only distinguishes the "category", and it is difficult to go deep into the level of "species" for identification
[0005] Although someone has developed a fingerprint method to identify mahogany furniture, but because it is a slice sampling, the sampling volume is large, which will destroy the appearance and function of wood or furniture.
In addition, it uses a simple gas chromatograph to measure the shape of the fingerprints. Those skilled in the art know that the gas chromatograph is only a "finger" spectrum, and the qualitative parameter is the retention time of the characteristic peak. There is only identification of "fingers", but no identification of "pattern". If there is a large difference in the content of a certain component, it will cause misjudgment, so the identification method is difficult to meet the requirements of consumers.

Method used

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  • A method for identifying the species of Dalbergia cochinchinensis with minimal damage based on fingerprints
  • A method for identifying the species of Dalbergia cochinchinensis with minimal damage based on fingerprints
  • A method for identifying the species of Dalbergia cochinchinensis with minimal damage based on fingerprints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: 1. Follow the steps (1.1) (1.2) in the pretreatment method of the above-mentioned standard sample to obtain the GC-MS 3D fingerprint of sample 1 (such as figure 2 ), and the matching table of the chemical substance information of the characteristic peaks of the spectrum and Table 1, as shown in Table 2 below.

[0054] Table 2

[0055]

[0056] 2. Identification

[0057] According to the chemical substance information table (Table 2) and Table 1 and figure 1 and figure 2 From the comparison, it can be seen that: ① The consistency of the retention time (D1) requires an allowable deviation of ±0.5min, which meets the requirements. ② The consistency of the mass spectrum (D2) is that the search matching rate is greater than 90%, among which the matching rate of the mass spectrum of sixteen characteristic peaks is less than 90%, and the matching rate of the mass spectrum of two characteristic peaks is greater than 90%, which does not meet the requiremen...

Embodiment 2

[0059] 1. Follow the steps (1.1) (1.2) in the pretreatment method of the above-mentioned standard sample for the test sample 2 to obtain the GC-MS 3D fingerprint of the sample 2 (such as image 3 shown), and the matching table of the chemical substance information of the characteristic peaks of the spectrum compared with Table 1, as shown in Table 3 below.

[0060] table 3

[0061]

[0062] 2 identification

[0063] According to the chemical substance information table (Table 3) and Table 1 and figure 1 and image 3 From the comparison, it can be seen that: ① The consistency of the retention time (D1) requires an allowable deviation of ±0.5min, which meets the requirements. ② The consistency of the mass spectrum (D2) is that the search matching rate is greater than 90%, among which the mass spectrum matching rate of one characteristic peak is less than 90%, and the mass spectrum matching rate of 17 characteristic peaks is greater than 90%, which meets the requirements. ...

Embodiment 3

[0064] Example 3: 1. Follow the steps (1.1) (1.2) in the pretreatment method of the above-mentioned standard sample for the test sample 3 to obtain the GC-MS 3D fingerprint of the sample 3 (such as Figure 4 ), and the matching table of the chemical substance information of the characteristic peaks of the spectrum and Table 1, as shown in Table 4 below.

[0065] Table 4

[0066]

[0067] 2. Identification

[0068] According to the chemical substance information table (Table 4) and Table 1 and figure 1 and Figure 4 The comparison shows that: ① The consistency of the retention time (D1) requires an allowable deviation of ±0.5 min, and the retention time deviation of the characteristic peak 13 Watsonite is greater than 0.5 min, which is listed as a suspicious characteristic peak. ② The consistency of the mass spectrum (D2) is that the search matching rate is greater than 90%, among which the matching rate of the mass spectrum of sixteen characteristic peaks is less than 9...

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Abstract

The invention relates to a method for identifying dalbergia cochinchinensis species in a microdamage mode based on a fingerprint spectrum. The method includes the steps that micropore sampling is conducted with a drill bit, a sample to be detected is added into solvent to be subjected to ultrasonic extraction, the retention time D1 of characteristic peaks, a mass spectrum D2 and the peak area D3 of a total ions chromatogram of an extraction solution serve as qualitative parameters to form the GC-MS 3D fingerprint spectrum, and then authenticity of the dalbergia cochinchinensis species sample is judged by checking matching consistency or similarity between the characteristic peaks in the GC-MS 3D fingerprint spectrum of the sample to be detected and 3D data of characteristic peaks in a GC-MS 3D fingerprint spectrum of the standard dalbergia cochinchinensis species. The unique mass spectrum D2 of organic matter is used as one of important qualitative parameters, the qualitative parameters D1 and D3 are added to form the 3D fingerprint spectrum, and multi-layer fingerprint confirmation ensures that an identification method is conducted on the dalbergia cochinchinensis species to judge authenticity accurately. Authenticity of a dalbergia cochinchinensis species product is judged through the method, and results are accurate and reliable; microdamage sampling is conducted, and the sampling amount is small, so that repair is easy, and the appearance of the product is not damaged.

Description

technical field [0001] The invention relates to the field of wood identification, in particular to a method for identifying the genus of Dalbergia cochinchinensis with minimal damage based on fingerprints. Background technique [0002] Dalbergia cochinchinensis (Latin: Dalbergia cochinchinensis ), Papilionaceae Dalbergia genus, wood characteristics: ①The new cut surface of the heartwood is purple reddish brown or dark reddish brown, often with dark brown or chestnut brown deep stripes. ②Diffuse porous wood, the growth ring is not obvious or slightly obvious. ③Axial parenchyma is quite obvious, mainly concentric layers of thin lines, sparse wing-like, wood fiber wall is very thick. ④Wooden rays can be seen under a magnifying glass, as well as ripple marks, and the ray tissue is of the same shape in single row or in multiple rows. ⑤Wood grain is simple and beautiful, elegant and fresh, with dark brown or black straight filamentary stripes, sour aroma or faint, air-dry densi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/025
Inventor 陈智勇黄明华罗晓妍仇镇武郭佳胡传宝马新年何舒敏其他发明人请求不公开姓名
Owner 中山市中广测协同创新中心
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