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630 results on '"Zhong, Liping"'

15. Simultaneous Determination of Eugenol and Its Five Derivatives in Aquatic Products by Ultra-high Performance Liquid Chromatography-Tandem Mass Spectrometry Combined with Quick, Easy, Cheap, Effective, Rugged and Safe Extraction

Author

LIN Chen, WU Min, WANG Kai, ZENG Sanmei, WU Jiawen, ZHONG Liping, LING Songjiang

Subjects
quick, easy, cheap, effective, rugged and safe, ultra-high performance liquid chromatography-tandem mass spectrometry, eugenol derivatives, aquatic products, internal standard method, Food processing and manufacture, TP368-456
Abstract

An ultra-high performance liquid chromatography-tandem mass spectrometric (UPLC-MS/MS) method was developed for the simultaneous determination of eugenol and its five derivatives including isoeugenol, methyl eugenol, methyl isoeugenol, acetyl eugenol and acetylisoeugenol in aquatic products. The samples were extracted with acetonitrile, and then the extracted supernatant was cleaned up with 50 mg of primary secondary amine (PSA) and 100 mg of C18 and 150 mg of MgSO4. Separation of the targets was performed on a Kinetex C18 (2.1 mm × 100 mm, 2.6 μm) chromatographic column by gradient elution using a mobile phase of water and methanol. The six eugenol derivatives were detected using an electrospray ionization (ESI) source with fast switching between the positive and negative ionization modes in the multiple reaction monitoring (MRM) mode, and quantified by the internal standard method using eugenol-D3 as the internal standard (IS). The calibration curves showed a good linearity in the range of 2–100 ng/mL for eugenol and isoeugenol, and 1–100 ng/mL for four other eugenol derivatives with correlation coefficient (r) ≥ 0.999. The average recoveries of spiked samples were between 67.0% and 106.4% with relative standard deviations (RSDs) of 1.2%–15.7%. The limits of detection (LOD, RSN = 3) and quantitation (LOQ) were 0.5–1.5 and 2.0–5.0 μg/kg, respectively. The method is an accurate, rapid and reliable assay for the detection of eugenol and its derivatives in aquatic products.

Published
2023
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20. Engineering a precise adenine base editor with minimal bystander editing

Author

Chen, Liang, Zhang, Shun, Xue, Niannian, Hong, Mengjia, Zhang, Xiaohui, Zhang, Dan, Yang, Jing, Bai, Sijia, Huang, Yifan, Meng, Haowei, Wu, Hao, Luan, Changming, Zhu, Biyun, Ru, Gaomeng, Gao, Hongyi, Zhong, Liping, Liu, Meizhen, Liu, Mingyao, Cheng, Yiyun, Yi, Chengqi, Wang, Liren, Zhao, Yongxiang, Song, Gaojie, and Li, Dali

Published
2023
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24. Drastic influence of substituent position on orientation of 2D layers enables efficient and stable 3D/2D perovskite solar cells

Author

Gunes, Ummugulsum, Yaylali, Figen Varlioglu, Gozukara Karabag, Zeynep, Gao, Xiao-Xin, Syzgantseva, Olga A., Karabag, Aliekber, Yildirim, Gulsevim Bensu, Tsoi, Konstantin, Shibayama, Naoyuki, Kanda, Hiroyuki, Rafieh, Alwani Imanah, Zhong, Liping, Züttel, Andreas, Dyson, Paul Joseph, Yerci, Selcuk, Nazeeruddin, Mohammad Khaja, and Gunbas, Gorkem

Published
2023
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27. Application of regional citrate anticoagulation in patients at high risk of bleeding during intermittent hemodialysis: a prospective multicenter randomized controlled trial

Author

Tang, Xiaoyan, Chen, Dezheng, Zhang, Ling, Fu, Ping, Chen, Yanxia, Xiao, Zhou, Xiao, Xiangcheng, Peng, Weisheng, Cheng, Li, Zhang, Yanmin, Li, Hongbo, Li, Kehui, Gou, Bizhen, Wu, Xin, Yu, Qian, Jian, Lijun, Zhu, Zaizhi, Wen, Yu, Liu, Cheng, Xue, Hen, Zhang, Hongyu, He, Xin, Yan, Bin, Zhong, Liping, Huang, Bin, and Mao, Mingying

Published
2022
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44. Iurnal Variability of Airway Hyperresponsiveness in Asthma Patients

Author

YU Xinxin, ZHENG Jinping, GAO Yi, XIE Yanqing, AN Jiaying, LIU Wenting, ZHONG Liping, WU Zhongping, ZHU Zheng

Subjects
asthma, respiratory function tests, lung function, airway hyperresponsiveness, bronchial provocation test, Medicine
Abstract

BackgroundThere are daytime variability in pulmonary function indexes such as peak expiratory flow (PEF) and forced expiratory volume in 1 second (FEV1) in asthma patients. Studies evaluating the effects of drug therapy on lung function and airway hyperresponsiveness (AHR) in asthma patients all required patients to perform spirometry and bronchial challenge test in the same time point of the days. However, whether there is a daily diurnal AHR variability is still not clear.ObjectiveTo explore the characteristics and diurnal variability of AHR in asthma patients.MethodsThe data of 202 patients with asthma who consulted in respiratory department of the First Affiliated Hospital of Guangzhou Medical University from January 2018 to September 2020 were included for statistical analysis. All patients completed the methacholine bronchial provocation tests, they were divided into the morning detection group (morning group) with 81 cases and the afternoon detection group (afternoon group) with 121 cases; according to the disease course, 98 cases were divided into the initial diagnosis group if the disease course was ≤6 months, and 104 cases were divided into the follow-up group if the disease course was >6 months. The initial diagnosis group and the follow-up group were divided into the initial diagnosis morning group, the initial diagnosis afternoon group, the follow-up morning group, and the follow-up afternoon group according to the detection time; according to the AHR, the patients were divided into very mild, mild, moderate and severe groups. The characteristics of AHR and the main pulmonary function indexes including FVC%pred, FEV1%pred, PEF%pred, MMEF%pred, MEF50%pred, MEF25%pred, PD20-FEV1, PD20-PEF, PD20-MMEF, PD20-MEF25%, PD20-MEF50% of these groups were analyzed and compared.ResultsThere were no significant differences of the math pulmonary function indexes and PD20 between morning and afternoon groups (P0.05) . In follow-up group, MMEF%pred and MEF50%pred were higher in afternoon than in morning (P0.05) .ConclusionThe longer the duration of asthma, more serious impairment of lung function found in asthma, while the AHR had no significant difference between morning and afternoon.

Published
2022
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45. Unity Power Factor Control of Single‐Phase Boost Rectifier Based on Dual Heterodyne Method.

Author

Zhong, Liping and Hu, Song

Subjects
*BRIDGE circuits, *VOLTAGE, *ELECTRIC current rectifiers, *ANGLES, *INTEGRALS
Abstract

ABSTRACT This paper proposes a novel control method to achieve the true unity power factor for a single‐phase boost rectifier. Firstly, the phase difference between the voltage and current on the AC side is calculated by the heterodyne method. Secondly, this phase difference is fed into an integral regulator to get a phase shift angle. Finally, by using the heterodyne method once again, the AC side current is phase‐shifted and used as the modulation signal for the single‐phase full bridge rectifier circuit and ultimately yields a unity power factor. The experimental results verify the effectiveness and feasibility of this strategy. [ABSTRACT FROM AUTHOR]

Published
2024
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