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Determination of 9 Penicillin Residues in Livestock and Poultry Meat-Selection of Analysis Conditions (2)

 Last Update: 2021-09-20
 Source: Internet
 Author: User

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(4) Selection of liquid chromatography analysis column

The μBondapak C ₁₈ 300mm×4.
0mm chromatographic column and the SunFire TM 3.
5μm C ₁₈ 150mm×2.
1mm chromatographic column were compared respectively
.

Experiments have found that the sensitivity of these two chromatographic columns can meet the requirements, but the uBondapak C ₁₈ 300mm×4.

(5) Determination of mass spectrometry conditions

Using a syringe pump for direct injection, the standard solutions of amoxicillin, ampicillin , piperacillin, penicillin G, penicillin V, oxacillin , cloxacillin, nafcillin, and dicloxacillin were injected into ions at 5μL/min.
Source, using positive ion detection method to perform primary mass spectrometry analysis (Q1 scan) of 9 penicillins, and the protonated molecular ion peaks are 366, 350, 518, 335, 351, 402, 436, 415, and 470, respectively.
Ions are analyzed by secondary mass spectrometry (product ion scanning) to obtain fragment ion information
.

The secondary mass spectra of 9 penicillins are shown in Figure 5-3

Figure 5-3 The secondary mass spectra of 9 penicillins

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