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Accurate Quantification of Pure Thiacloprid with Mass Balance and Quantitative H-NMR

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Journal of Analysis and Testing 2024年第1期8卷 1-8页

作者： Mengling Tu Wei Zhang Yunxiao zhu Wen Ma Xiao Li Shukun Zhou hongmei Li Xianjiang Li Key Laboratory of Chemical Metrology and Applications on Nutrition and Health for State Market Regulation Division of Metrology in ChemistryNational Institute of MetrologyBeijing 100029China State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing 102249China State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

Thiacloprid is the first-generation neonicotinoid insecticide,which is widely used in modern *** materials are essential for sound measurement and traceability of results in chemical *** thiacloprid was comprehensively assessed by two orthonormal methods:mass balance(MB) and quantitative nuclear magnetic resonance spectroscopy(qNMR).From MB,its mass fraction value was 998.4 mg/g with the subtraction of structurally related impurities(99.87%),inorganic impurities(0.006 mg/g),water(0.33 mg/g),and volatile organic solvent(0 mg/g).To guarantee sufficient separation of structurally related purity,peak purity of thiacloprid was evaluated by five points of UV *** the qNMR of hydrogen,its mass fraction value was 995.7 mg/g which was traced to the internal standard(methyl sulfone).Finally,the certified value was assigned to 997 mg/g,together with an expanded uncertainty of 3 mg/g(k=2).This high-purity thiacloprid can be applied to routine monitoring in agriculture and the food fields.

关键词： Mass balance Quantitative nuclear magnetic resonance spectroscopy Reference material Thiacloprid

清热凉血法治疗高雌激素血症合并子宫不规则出血临床研究

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陕西中医 2024年第2期45卷 208-212,216页

作者：赵珊珊杨思琪朱红梅欧阳长理陈婷许晴王光慧徐州医科大学附属医院江苏徐州221000 睢宁县人民医院妇科江苏雎宁221000

目的:研究探讨清热凉血法治疗高雌激素血症合并子宫不规则出血(AUB)的临床疗效。方法:选择80例高雌激素血症合并子宫不规则出血患者,按治疗方案分为对照组(口服地屈孕酮治疗)38例和观察组(口服地屈孕酮+清热凉血法治疗)42例,观察比较两... 详细信息

目的:研究探讨清热凉血法治疗高雌激素血症合并子宫不规则出血(AUB)的临床疗效。方法:选择80例高雌激素血症合并子宫不规则出血患者,按治疗方案分为对照组(口服地屈孕酮治疗)38例和观察组(口服地屈孕酮+清热凉血法治疗)42例,观察比较两组治疗前、治疗后及停药3个月后的血清雌二醇(E2)、血红蛋白含量(Hb)及子宫内膜厚度;比较两组治疗前后的中医症候积分、平均经期天数、平均月经周期、凝血相关指标变化;并比较两组治疗后平均止血天数、总有效率和停药3个月的复发率。结果:观察组治疗后与停药3个月后的血清E2、Hb水平及子宫内膜厚度比较差异无统计学意义(P>0.05);观察组治疗后与停药3个月后的血清E2、子宫内膜厚度均比治疗前明显下降(P<0.05),Hb水平比治疗前明显升高(P<0.05),改善程度均优于对照组同期水平(P<0.05)。观察组治疗后的中医症候积分、各项凝血指标均比治疗前明显下降(P<0.05),平均经期天数、平均月经周期均比治疗前明显缩短(P<0.05),改善程度均优于对照组同期水平(P<0.05)。观察组治疗后平均止血天数明显低于对照组(P<0.05),治疗总有效率明显高于对照组(P<0.05),停药3个月的复发率明显低于对照组(P<0.05)。结论:清热凉血法治疗高雌激素血症合并AUB可获得满意止血效果,有效改善相关中医症候,缩短止血时间,加快重建月经周期,减少复发。

关键词：子宫不规则出血地屈孕酮清热凉血高雌激素血症月经周期雌二醇

Facile synthesis of enzyme functional metal-organic framework for colorimetric detecting H_2O_2 and ascorbic acid

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Chinese Chemical Letters 2017年第5期28卷 1006-1012页

作者： Cunji Gao hongmei zhu Jia Chen Hongdeng Qiu Key Laboratory of Chemistry of Northwestern Plant Resources Key Laboratory for Natural Medicine of Gansu ProvinceLanzhou Institute of Chemical PhysicsChinese Academy of Sciences Institute of Microbiology and Biochemical Pharmacy School of PharmacyLanzhou University

In this work,a metal-organic frameworks material MIL-88 was prepared easily using solvent-thermal method,and was first found to have catalytic activities similar to those of biological enzymes such as catalase and *** material was characterized by XRD,SEM,TEM,EDX,FT-IR techniques and an N2 adsorption *** exhibited peroxidase-like activity through catalytic oxidation of the peroxidase substrate 3,3＇,5,5＇-tetramethylbenzidine（TMB） in the presence of H2O2,producing a blue-colored *** optimal conditions,the absorbance at 652 nm is linearly correlated with the concentration of H2O2 from 2.0×10^-6 mol/L to 2.03×10^-5 mol/L（R-2=0.981） with a detection limit of 5.62×10^-7 mol/L（S/N=3）.More importantly,a sensitive and selective method for ascorbic acid detection was developed using this material as a *** analytical method for ascorbic acid detection was observed to have a linear range from 2.57×10^-6 mol/L to 1.01×10^-5 mol/L（R-2=0.989） with a detection limit of 1.03×10^-6 mol/L（S/N=3）.This work suggests MOFs have advantages of preparing biomimetic catalysts and extends applications of the functional MOFs in the field of biosensor.

关键词： Metal-organic frameworks Horseradish peroxidase H2O2 Ascorbic acid Colorimetric detection Biomimetic catalyst

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不同处理对贮藏期鲜切马铃薯的护色作用

中国食品添加剂 2024年第5期35卷 75-83页

作者：孟霏任红霞贾靖王昕昕李国琴宋小青朱洪梅额日赫木山西师范大学食品科学学院太原030006

为探究天然护色剂对鲜切马铃薯的作用效果,采用10 g/L柠檬酸(citric acid,CA)、6 g/L甜菜碱(betaine,GB)和6 g/L茶多酚(tea polyphenols,TP)为材料,以鲜切马铃薯的褐变指数值(browning index,BI),多酚氧化酶(polyphenol oxidase,PPO)活性、过氧化物酶(peroxidase,POD)活性、苯丙氨酸解氨酶(phenylalanine ammonialyase,PAL)活性、总酚含量、丙二醛(malondialdehyde,MDA)含量和抗氧化能力为指标,研究0-12 d内各试验组的护色效果。结果表明,CA、GB和TP处理对鲜切马铃薯酶促褐变均有不同程度的抑制效果,其中CA处理对鲜切马铃薯BI值、PAL活性及总酚含量抑制作用显著;GB处理对MDA含量抑制作用突出;TP处理对PPO、POD活性抑制作用明显,对抗氧化能力提升显著。本研究结果可为鲜切果蔬保鲜提供依据。

关键词：鲜切马铃薯酶促褐变柠檬酸甜菜碱茶多酚

Study on HCI removal for medical waste pyrolysis and combustion using a TG-FTIR analyzer

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Frontiers of Environmental Science & Engineering 2015年第2期9卷 230-239页

作者： hongmei zhu Weiying CHEN Xuguang JIANG Jianhua YAN Yong CHI College of Automation Hangzhou Dianzi University Hangzhou 310018 China Hangzhou Boiler Group Co. Ltd. Hangzhou 310021 China State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310013 China

Under both pyrolysis and combustion condition, HCl removal efficiency for medical waste with Cabased additives was semi-quantitatively studied by means of TG-FTIR. Additionally, the difference of HCl removal efficiency for PVC and medical waste was compared. Experimental results showed that： 1） Thermal degradation of medical waste mainly took place in two steps under both pyrolysis and combustion condition; 2） HC1 emitted at both two steps and HCl concentration increased with the increased of Cl ratio in the medical waste; 3） for the same additive, HCI concentration decreased with the increased of additives amount, that is to say, HCI removal efficiency of medical waste increased as the increased of Ca/Cl molar ratio. Fourth, when Ca（OH）2 was used as additive, HCl removal efficiency for medical waste combustion was a little higher than that for medical waste pyrolysis, but either CaCO3 or CaO was used as additive, it was just opposite, more specifically, when CaCO3 was used as additive with Ca/CI= 1.3, HC1 removal efficiency was 5.49% under pyrolysis condition, but that was only 4.24% under combustion condition. Fifth, under the same Ca/CI molar ratio, HCl removal efficiency for PVC was higher than that for medical waste under both pyrolysis and combustion condition, more specifically, when Ca（OH）2 was used as additive with Ca/Cl-1, HCl removal efficiency was 64.51% for PVC, but that was only 27.66% for medical waste pyrolysis with 4% Cl under pyrolysis condition .

关键词： pollution medical waste pyrolysis combustion TG-FTIR HCl removal

Thermogravimetric coupled with Fourier transform infrared analysis study on thermal treatment of monopotassium phosphate residue

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Frontiers of Environmental Science & Engineering 2011年第2期5卷 186-192页

作者： Yuheng FENG Xuguang JIANG Yong CHI Xiaodong LI hongmei zhu State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Hangzhou Huanjie Environment Engineering Co.Ltd. Hangzhou 310027China

In China,safe disposal of hazardous waste is more and more a necessity,urged by rapid economic *** pyrolysis and combustion characteristics of a residue from producing monopotassium phosphate(monopotassium phosphate residue),considered as a hazardous waste,were studied using a thermogravimetric,coupled with Fourier transform infrared analyzer(TGFTIR).Both pyrolysis and combustion runs can be subdivided into three stages:drying,thermal decomposition,and final *** average weight loss rate during fast thermal decomposition stage in pyrolysis is higher than *** acid,methane,pentane,(acetyl)cyclopropane,2,4,6-trichlorophenol,CO,and CO_(2) were distinguished in the pyrolysis process,while CO_(2) was the dominant combustion product.

关键词： hazardous waste combustion pyrolysis thermogravimetric coupled with Fourier transform infrared analysis(TG-FTIR) monopotassium phosphate residue

激光增材含铝马氏体不锈钢的高温摩擦磨损性能研究

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材料保护 2024年第1期57卷 73-79,180页

作者：李会杰雷远涛伍文星申龙章陈勇朱红梅邱长军南华大学超常环境下装备安全服役技术湖南省重点实验室湖南衡阳421001

激光增材马氏体不锈钢可应用于600℃以下的高温部件,为了进一步提高其高温耐磨性能,制备了4种不同铝含量(0、1%、2%、3%,质量分数)的马氏体不锈钢试样,采用箱式电阻炉对4种马氏体不锈钢试样分别在25、200、400、600℃温度下进行热处理... 详细信息

激光增材马氏体不锈钢可应用于600℃以下的高温部件,为了进一步提高其高温耐磨性能,制备了4种不同铝含量(0、1%、2%、3%,质量分数)的马氏体不锈钢试样,采用箱式电阻炉对4种马氏体不锈钢试样分别在25、200、400、600℃温度下进行热处理。采用OM、XRD、SEM、3D景深显微镜、高温摩擦磨损试验机等仪器和JMatPro软件研究了试样的金相组织与高温摩擦磨损性能。结果表明:随着铝含量的增加,试样的平均硬度从57.87 HRC降至42.46 HRC,随着600℃保温时间的延长,试样的硬度均快速下降并趋于稳定,其值从44.79 HRC降至28.70 HRC,铝含量的增加对试样在25℃下的摩擦系数的影响并不明显,其值均在0.8~0.9之间;当铝含量达到3%时,试样在600℃环境中的摩擦系数降至0.45左右,约为25℃下的52.94%,体积磨损量降至0.0214 mm^(3),约为25℃下的9%,试样主相为马氏体相及少量碳化物等析出相。添加3%铝可显著改善激光增材马氏体不锈钢的高温摩擦磨损性能。

关键词：马氏体不锈钢铝含量激光增材高温耐磨性

Acid-catalyzed chemodivergent reactions of 2,2-dimethoxyacetaldehyde and anilines

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Chinese Chemical Letters 2021年第4期32卷 1419-1422页

作者： Luxia Guo Zihao Chen hongmei zhu Minghao Li Yanlong Gu Huazhong University of Science and Technology Hubei Key Laboratory of Material Chemistry and Service FailureWuhan 430074China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsLanzhou 730000China The Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi UniversityShihezi 832004China

Chemodivergent reactions of 2,2-dimethoxyacetaldehyde and anilines were described,which were established on the basis of either a C—C bond cleavage or a rearrangement process of a reaction inte *** reactions proceeded in a condition-determined manner with good functional group *** the first model,2,2-dimethoxyacetaldehyde reacted with aniline to form a new C—N bond,in the presence of O_(2),via a C—C bond cleavage ***,in the second model,by performing the reaction in the absence of O_(2),Heyns rearrangement occurred and generated a new C—O bond to form methyl *** condition-determined reactions not only offered the new way for valueadded conversion of biomass-derived platform molecule,2,2-dimethoxyacetaldehyde,but also provided efficient methods for the synthesis of N-arylformamides and methyl phenylglycinates.

关键词： Condition-determined reaction Chemodivergent reaction 2 2-Dimethoxyacetaldehyde C-C bond cleavage Heyns rearrangement

Chinese expert consensus on primary prevention for pelvic floor dysfunction during pregnancy

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Gynecology and Obstetrics Clinical Medicine 2023年第3期3卷 133-139页

作者： Xiuli Sun Lei Gao hongmei zhu Wei Jiao Jianjun Guo Jianliu Wang Lihui Wei Sports Exercise and Health Branch of Chinese Preventive Medicine Association Department of Obstetrics and Gynecology Peking University People's HospitalBeijingChina School of Sports Medicine and Physical Therapy Beijing Sports UniversityBeijingChina Sports and Medicine Integration Innovation Center Capital University of Physical Education and SportsBeijingChina 不详

Objective Pregnancy has been identified as a risk factor for pelvic floor dysfunction(PFD).The aim of this study was to establish primary prevention measures for PFD during pregnancy and reduce the overall incidence of *** We assembled a panel of 36 experts,including gynecologists,obstetricians,and *** surveys and expert meetings,the panel reviewed and assessed the safety and effectiveness of various clinical *** on expert comments from Round 1,a revised list of 8 clinical interventions was developed and submitted for a second round of expert *** A consensus was reached on the importance of implementing prevention measures to protect pelvic floor function during *** particularly emphasized the significance of health education,weight management,pelvic floor muscle training,respiratory training,overall exercise,physical activity,and perineal *** The expert consensus provides comprehensive clinical measures to safeguard pelvic floor function during *** paper represents the initial step toward developing scientific recommendations for pregnant women regarding the primary prevention of *** research should focus on the implementation of these recommendations in clinical practice.

关键词： Pelvic floor muscle training Pelvic floor dysfunction Pregnancy Primary prevention Respiratory training Overall training Physical activity