Method for simultaneously detecting five anthraquinone compounds in polygonum multiflorum based on combination of solid-phase dispersion extraction and ultra-high performance liquid chromatography
An ultra-high-efficiency liquid phase and solid phase dispersion technology, applied in the field of analysis, can solve problems such as chromatographic column damage, co-extraction measurement interference, and complex matrix of Chinese herbal medicines.
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Embodiment 1
[0021] An Acquity UPLC H-Class Plus ultra-high performance liquid chromatograph (U.S. waters company) was used, equipped with an Acquity quaternary gradient pump, an Acquity FTN autosampler, an Acquity column oven and an Acquity FDA diode array detector. Chromatographic conditions: Chromatographic column: ACQUITY UPLC ® HSS T3 analytical column (2.1mm×100 mm×1.8 μm); column temperature: 35°C; injection volume: 5μL; mobile phase: phase A is water (containing 0.1% formic acid), Phase B is acetonitrile (containing 0.1% formic acid), the gradient elution program is shown in Table 1; flow rate: 0.4 mL / min; detection wavelength: 254 nm.
[0022] Table 1 Gradient elution program
[0023]
Embodiment 2
[0025] Prepare mixed standard solutions of 5 kinds of anthraquinone compounds with a series of mass concentrations, and measure them under the above-mentioned chromatographic conditions. Draw a standard curve with the peak area Y of each component against the mass concentration X (see Table 2), and the 5 target compounds are linearly good linearity over the range ng (R 2 >0.9964), the limit of detection (LOD) and limit of quantification (LOQ) were in the range of 0.01-0.07 mg / L and 0.04-0.28 mg / L, respectively.
[0026] Table 2 Linear equation, detection limit and quantification limit of 5 kinds of anthraquinone compounds
[0027]
Embodiment 3
[0029] Sample pretreatment: Weigh 0.5 g (accurate to 0.001 g) of Polygonum multiflorum, add 30 mL of 70% methanol, ultrasonically extract for 30 min, centrifuge at 5000 rpm for 5 min, take the supernatant, dilute with water to make the methanol content 50% . Take 5mL of the above extract, add 0.6 g C 18 Adsorb the material, vortex and oscillate for 10 min, centrifuge at 10,000 rpm for 10 min, collect the C18 material, and repeat the above adsorption steps twice with the C18 material in the supernatant. C used for merging 3 times 18 The material was ultrasonically eluted with 20 mL of acetonitrile for 30 min, centrifuged at 10,000 rpm for 10 min, the supernatant was taken out, dried with nitrogen, the residue was reconstituted with 0.5 mL of methanol, and passed through a 0.22 μm filter membrane for UPLC-DAD analysis.
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