Lipidomics analysis method for toxoplasma gondii based on high performance liquid chromatography tandem high-resolution mass spectrum and application
A technology of high-performance liquid chromatography and high-resolution mass spectrometry, which is applied to the analysis of materials, scientific instruments, and material separation. It can solve problems such as low resolution, interference, and complex sample derivation process, achieving good repeatability and simple pretreatment. , Sample determination and analysis efficiency are high
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[0033] Example 1 Establishing a method for detecting Toxoplasma gondii tachyzoite cardiolipin molecule
[0034] Use methanol to prepare 1ppm cardiolipin standard C56:0 solution, using HPLC-Q-TOF-MS (LC-20ADXR high performance liquid chromatography, AB SCIEX Triple TOF TM 5600 type Q-TOF quadrupole tandem time-of-flight mass spectrometry) injection analysis. Chromatographic analysis conditions:
[0035] Injection volume 5μl; column temperature 40℃; flow rate 0.4mL / min; gradient elution program is injection 0-0.5min, adjust mobile phase A:B (80:20, v / v), elution 0.5-1.5min ; Mobile phase A: B (60:40, v / v), elution 1.5-3min; Mobile phase A: B (40:60, v / v), elution 3-4.5min; Mobile phase A: B( 10:90, v / v), eluted for 2min; then stably maintained in mobile phase B to the 17th minute.
[0036] Mobile phase A is acetonitrile: water: methanol (20:60:20, v / v / v), containing 5mM ammonium acetate, mobile phase B is isopropanol: acetonitrile (90:10, v / v), containing 5mM 的ammonium acetate.
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[0040] Example 2 Identification of various lipid molecules of Toxoplasma gondii
[0041] 1. Extraction of lipids from Toxoplasma gondii tachyzoites
[0042] Human foreskin fibroblasts HFFs were cultured in DMEM containing 15% FBS. After the cell flasks were filled, the DMEM medium with 1% FBS was replaced with Toxoplasma gondii tachyzoites and cultured for 3 days. After the worms are released, use the cell scraper to break the adherent cells, and then use a syringe with a 26G needle to suck the broken cell suspension and blow the cell bottle wall. After repeated pipetting and pipetting 3 times, filter with an 8μm diameter filter The cell suspension was centrifuged at 2000 rpm for 8 min, the supernatant was discarded, and the precipitate was the purified tachyzoite. Collect at least 1×10 8 A tachyzoite for subsequent sample preparation.
[0043] 2 Preparation of lipid extract samples: Suspend tachyzoites in 1ml PBS buffer, centrifuge at 2000rpm for 8min, wash away the residual mediu...
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