Fingerprint-based micro-loss method for identification of Pterocarpus species
A fingerprint and hedgehog technology, applied in the field of wood identification, can solve the problems of complicated process, large sampling volume, damage to the appearance and function of wood or furniture, and achieve the effect of easy repair and accurate identification results
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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 there are 20 characteristic peaks whose mass spectrum matching rate is less than 90%, and the mass spectrum matching rate of five characteristic peaks are greater than 90%, which does not meet the requirements. ③ T...
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 24 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 a tolerance of ±0.2 min, and the retention time deviation of the characteristic peak 20 gestrinone is greater than 0.5 min, which is listed as a suspicious characteristic peak. ②The consistency of the mass spectrum (D2) is that the search matching rate is greater than 90%, among which the mass spectrum matching rate of 21 characteristic peaks is less than 90%, and the mass spectr...
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