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    Simultaneous detection of 13 phenolic acids in Gynostemma pentaphyllum from Pingli, Shaanxi Province by HPLC
    WANG Ke, ZHOU Qiong, LI Jian-ke
    HUBEI AGRICULTURAL SCIENCES    2024, 63 (5): 182-186.   DOI: 10.14088/j.cnki.issn0439-8114.2024.05.032
    Abstract219)      PDF (1702KB)(30)       Save
    In order to establish a method for simultaneously detecting the content of 13 phenolic acids in Gynostemma pentaphyllum from Pingli, Shaanxi,high performance liquid chromatography (HPLC) was used. Methanol aqueous solution (80%) was used for room temperature vortex and ultrasonic extraction,the chromatographic column was Dimensions C18(4.6 mm×150 mm,5 μm,P/N: 227-30011-07, C/N: 18C03033), with a mobile phase of methanol (100%) and phosphoric acid aqueous solution (0.5%). The elution method was gradient elution, with a detection wavelength of 280 nm, column temperature of 30 ℃, flow rate of 1.0 mL/min, and injection volume of 5 μL. The results showed that there was a good linear relationship among the 13 phenolic acids at concentrations of 5~100 mg/L, with a correlation coefficient (R2) ≥ 0.998; in the sample spiking recovery experiment, the average spiking recovery rate was 61.8%~131.0%. This determination method had good precision, repeatability, and stability, and was suitable for the determination of phenolic acids content in Gynostemma pentaphyllum from Pingli, Shaanxi.
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    Determination of nine mycotoxins in Panax notoginseng by ultra high performance liquid chromatography quadrupole time-of-flight mass spectrometry
    CHENG Long, LI Yun-fei, WU Si-chao, ZHAO Feng-qing, ZHANG Guo-shuai, HE You-yan, TAO Lei, WANG Ying
    HUBEI AGRICULTURAL SCIENCES    2024, 63 (6): 187-192.   DOI: 10.14088/j.cnki.issn0439-8114.2024.06.030
    Abstract217)      PDF (2442KB)(33)       Save
    An ultra high performance liquid chromatography quadrupole time-of-flight mass spectrometry screening and confirmation method was established for 9 types of mycotoxins in Panax notoginseng. The residual levels of 9 types of mycotoxins (Aflatoxin B1、Aflatoxin B2、Aflatoxin G1、Aflatoxin G2、Fumonitoxin B1、Fumonitoxin B2、Deoxynivalenol、Zearalenone、Ochratoxin A) in Panax notoginseng were quickly screened. The chromatographic column was Phenomenex Kinetex C18 (100 mm × 2.1 mm, 2.6 μm), and gradient elution was performed using 0.1% formic acid aqueous solution and 0.1% formic acid methanol solution as mobile phases. Positive ion scanning and the matrix matching external standard method were used for quantification. The results showed that 9 types of mycotoxins had good linear relationships within the concentration ranges of 0.1~100.0, 5.0~1 000.0, and 0.5~500.0 μg/L, respectively,the correlation coefficients were all greater than 0.990 00, and the quantitative limit of the method was 0.3~15.0 μg/kg. At three spiked levels of high, medium, and low concentrations, the recovery rate was 71.22%~98.57%, and the relative standard deviation was 2.31%~6.72%. This method could match the precise mass numbers and fragment ion information of primary and secondary mass spectra in the mass spectrometry database without reference materials, reducing experimental costs. It had the advantages of simplicity, rapidness, efficiency, and accuracy, and was suitable for the rapid screening and determination of mycotoxins residues in Panax notoginseng.
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