A-1331852_HNMR_24105_MedChemExpress
QPCR及QRT-PCR系列产品
Invitrogen的ICFC系列产品促销1．QPCR及QRT-PCR系列产品Invitrogen公司专门为中国客户提供的定量PCR试剂盒，结合了 UDG 防止残余污染技术和SYBR® Green I 荧光染料（存在于SYBR® Green I荧光定量PCR试剂盒中），在美国接受了严格的质量监控，可提供极高灵敏度的目的序列定量检测，线性剂量低，反应浓度范围很大。
qPCR Supermix-- 即用型反应剂，专为高特异性、实时定量DNA扩增设计UDG-- 防止携带污染物，减少克隆片段假阳性结果ROX参考染料-- 适用ABI仪器的校正染料产品信息活动时间：即日起至2009年4月30日2．Gibco南美胎牛血清即日起凡优惠价¥1780购买Gibco胎牛血清500ml（目录号:C2027050）即可获赠送价值¥250现金抵用券。
您可以凭现金抵用券在英韦创津公司购买任何商品，此券有效期至2009年5月31日。
产品信息活动时间：即日起至2009年4月30日独特的采集方式：GIBCO采用无菌心脏穿刺的方式采血原装直送，避免污染：原产地采集、加工、检测、包装。
完善的质控：采集、处理、检测、运输等环节都有文件和证书。
3．Invitrogen TA Cloning克隆产品专门用于克隆Taq聚合酶扩增的PCR产物。
采用pCR载体，能产生80%以上的重组产物，90%以上重组产物都包含插入片段。
产品信息活动时间：即日起至2009年5月31日附：pCR载体优点及图谱：3’-T突出端可直接连接Taq扩增的PCR产物可选择T7或T7和Sp6启动子进行体外RNA转录和测序侧向EcoRⅠ位点的通用多接头位点方便了插入片段的切离可以选择卡那霉素或氨苄青霉素进行筛选非常简便的蓝/白克隆筛选具有M13正向和反向引物位点，方便测序4．GIBCO液体培养基系列产品创立近50年的历史，品质优秀，产品种类丰富；为了中国用户利益，特建立国内生产线；所有产品，从原材料到生产全部按照GIBCO质量标准进行，每批均送抵美国公司总部质检合格后，才在国内销售。
RNA靶向的CRISPRCasRx系统在小鼠精原细胞系GC1-spg中的应用
基础医学与临床Basic & Clinical MedicineMay 2021Vol.41 No.52021年5月 第41卷第5期文章编号：1001-6325(2021)05-0653-08 研究论文RNA 靶向的CRISPR/CasRx 系统在小鼠精原细胞系GCl-spg 中的应用李梦真，柳 俊，邹定峰，缪时英，王琳芳，宋伟，李凯**收稿日期：2021-01-26 修回日期：2021-03-20基金项目：国家自然科学基金(31970794,32000586)* 通信作者(corresponding author) ：likai@ (中国医学科学院基础医学研究所北京协和医学院基础学院医学分子生物学国家重点实验室，北京100005) 摘要：目的探究CRISPR/CasRx 介导的RNA 水平的基因敲降在小鼠精原细胞系GCl-spg 的应用。
方法利用同源重组的方法构建 EFla core promoter. CasRx. SV40. U6. DRs 表达质粒(CasRx-gRNA)和 EFla. EGFP,EFla. mCherry 、EFla. tdToamto 3种荧光蛋白表达质粒。
在人胚肾细胞系HEK-293T 内瞬时转染3种荧光蛋白表达质粒和CasRx-gRNA 表达质粒，通过荧光强度、Western blot 检测外源基因(荧光蛋白、EGFP 和mCherry)的敲降情况。
在HEK-293T细胞内转染CasRx-gRNA,通过q-PCR 检测内源基因mRNA 和IncRNA 干扰后的表达水平。
在小鼠精原细胞系GC1 内瞬时转染外源基因eg 加、mCherry 和CasRx-gRNA 表达质粒并通过以上方法检测外源基因(荧光蛋白)沉默效率。
结 果 成功构建了 CasRx-gRNA 和3种荧光蛋白表达质粒。
在HEK-293T 细胞内CRISPR/CasRx 介导的RNA 干扰外源基因(e 曲、mCherry )和内源基因(mRNA 、lncRNA )后，表达水平均显著下调(P<0.01)o 在小鼠精原细胞系GC1内验 证CRISPR/CasRx 系统,可有效和特异敲降外源基因e 加、mCherry 。
西格玛奥德里奇（上海）贸易有限公司_企业报告(供应商版)
主要资质：
一、业绩表现
1.1 总体指标
近 1 年(2022-08~2023-08)：
中标项目数(个)
69
同比增长：1280.0%
中标率
98.6%
同比增长：-1.4%
中标总金额(万元)
(不含费率与未公示金额)
￥66.6
同比增长：6130.4%
平均下浮率
23.0%
同比增长：-30.5%
注：平均下浮率是指，项目下浮金额与预算金额的比值的平均值。（下浮金额=项目预算金额-中标金额）
1.1 总体指标 ..........................................................................................................................1 1.2 业绩趋势 ..........................................................................................................................1 1.3 项目规模 ..........................................................................................................................2 1.4 地区分布 ..........................................................................................................................4 1.5 行业分布 ...........................................................................................................................6 二、竞争能力 .................................................................................................................................7 2.1 中标率分析 ......................................................................................................................7 三、竞争对手 .................................................................................................................................7 3.1 主要竞争对手....................................................................................................................7 3.2 重点竞争项目....................................................................................................................8 四、服务客户 .................................................................................................................................8 4.1 关联客户中标情况 ............................................................................................................8 4.2 主要客户投标项目............................................................................................................9 五、信用风险 .................................................................................................................................9 附录 ...............................................................................................................................................9
AR-A014418_DataSheet_MedChemExpress
Inhibitors, Agonists, Screening Libraries Data SheetBIOLOGICAL ACTIVITY:AR–A014418 is a selective and effective GSK3β inhibitor with an IC 50 value of 104 nM, and has no significant inhibition on 26 other kinases.IC50 & Target: IC50: 104 nM (GSK3β)In Vitro: AR–A014418 inhibits tau phosphorylation at a GSK3–specific site (Ser–396) in 3T3 fibroblasts expressing human four–repeat tau protein with IC 50 of 2.7 μM, and protects cultured N2A cells from death induced by blocking PI3K/PKB pathway. In hippocampal slices, AR–A014418 inhibits neurodegeneration mediated by beta–amyloid peptide [1]. While in NGP and SH–5Y–SY cells,AR–A014418 reduces neuroendocrine markers and suppresses neuroblastoma cell growth [2].In Vivo: In ALS mouse model with the G93A mutant human SOD1, AR–A014418 (0–4 mg/kg, i.p.) delays the onset of symptoms,improves motor activity, slows down disease progression, and postpons the endpoint of the disease [3]. In addition, AR–A014418produces inhibition effect on acetic acid– and formalin–induced nociception in mice by modulating NMDA and metabotropic receptor signaling as well as TNF–α and IL–1β transmission in the spinal cord [4].PROTOCOL (Extracted from published papers and Only for reference)Kinase Assay:[1]The competition experiments are carried out in duplicate with 10 concentrations of the inhibitor inclear–bottomed microtiter plates. The biotinylated peptide substrate, biotin–AAEELDSRAGS(PO3H2)PQL, is added at a final concentration of 2 μM in an assay buffer containing 6 milliunits of recombinant human GSK3 (equal mix of both α and β), 12mM MOPS, pH 7.0, 0.3 mM EDTA, 0.01% β–mercaptoethanol, 0.004% Brij 35, 0.5% glycerol, and 0.5 μg of bovine serumalbumin/25 μL and preincubated for 10–15 min. The reaction is initiated by the addition of 0.04 μCi of [γ–33P]ATP and unlabeled ATP in 50 mM Mg(Ac)2 to a final concentration of 1 μM ATP and assay volume of 25 μL. Blank controls without peptide substrate are used.After incubation for 20 min at room temperature, each reaction is terminated by the addition of 25 μL of stop solution containing 5mM EDTA, 50 μM ATP, 0.1% Triton X–100, and 0.25 mg of streptavidin–coated SPA beads corresponding to appr 35 pmol of binding capacity. After 6 h the radioactivity is determined in a liquid scintillation counter. Inhibition curves are analyzed by non–linear regression using GraphPad Prism.Cell Assay: AR–A014418 is dissolved in DMSO.[1]Cell viability is assessed by calcein/propidium iodide uptake. Calcein AM is taken up and cleaved by esterases present within living cells, yielding yellowish–green fluorescence, whereas PI is only taken up by dead cells,which become orange–red fluorescent. In brief, N2A cells are cultured for 2 days in vitro and then treated with 50 μM LY–294002 in the presence of AR–A014418 or vehicle (DMSO) for 24 h. Subsequently, N2A cells are incubated for 30 min with 2 μM PI and 1 μM calcein–AM. The cultures are then rinsed three times with Hanks' buffered saline solution containing 2 mM CaCl 2, and the cells are visualized by fluorescence microscopy using a Zeiss Axiovert 135 microscope. Three fields (selected at random) are analyzed per well (appr 300 cells/field) in at least three different experiments. Cell death is expressed as percentage of PI–positive cells from the total number of cells. In every experiment, specific cell death is obtained after subtracting the number of dead cells present inProduct Name:AR–A014418Cat. No.:HY-10512CAS No.:487021-52-3Molecular Formula:C 12H 12N 4O 4S Molecular Weight:308.31Target:GSK–3; GSK–3Pathway:Stem Cell/Wnt; PI3K/Akt/mTOR Solubility:10 mM in DMSOvehicle–treated cultures.Animal Administration: AR–A014418 is formulated in normal saline.[3]First, to examine the effects of GSK–3 inhibition on the clinical symptoms, life span, and motor behavior function of ALS, 56 Tg mice are divided into four groups. In each group, 0.5 mL of normal saline is mixed with either 0 μg (control group), 1 μg (group A), 2 μg (group B) or 4 μg (group C) of AR–A014418 per gram of mouse, and injected intraperitoneally into 14 animals per group 5 days a week beginning 60 days after birth. The mice are sacrificed at the endpoint described below.References:[1]. Bhat R, Xue Y, Berg S, Structural insights and biological effects of glycogen synthase kinase 3–specific inhibitor AR–A014418. J Biol Chem. 2003 Nov 14; 278(46):45937–45.[2]. Carter YM, et al. Specific glycogen synthase kinase–3 inhibition reduces neuroendocrine markers and suppresses neuroblastoma cell growth. Cancer Biol Ther. 2014 May;15(5):510–5.[3]. Koh SH, et al. Inhibition of glycogen synthase kinase–3 suppresses the onset of symptoms and disease progression of G93A–SOD1 mouse model of ALS. Exp Neurol. 2007 Jun;205(2):336–46.[4]. Martins DF, et al. The antinociceptive effects of AR–A014418, a selective inhibitor of glycogen synthase kinase–3 beta, in mice. J Pain. 2011 Mar;12(3):315–22.Caution: Product has not been fully validated for medical applications. For research use only.Tel: 609-228-6898 Fax: 609-228-5909 E-mail: tech@Address: 1 Deer Park Dr, Suite Q, Monmouth Junction, NJ 08852, USA。
安捷伦产品目录
15
Real-Time PCR
16
Mx3000P QPCR System
17
Brilliant III Ultra-Fast SYBR Green QPCR and QRT-PCR Reagents
18
Brilliant III Ultra-Fast QPCR and QRT-PCR Reagents
Agilent / STRATAGENE
Agilent website: /genomics
Welgene | Agilent Stratagene
威健股份有限公司 | Stratagene 總代理
Table of Content
Table of Contents
/ XL1-Red Competent Cells SoloPack Gold Supercompetent Cells
/ TK Competent Cells Specialty Cells
/ Classic Cells / Fine Chemicals For Competent Cells
適用於 UNG 去汙染或 bisulphite
sequencing
適用於 TA Cloning
最高敏感性
取代傳統 Taq 的好選擇
-
2
威健股份有限公司 | Stratagene 總代理
PCR Enzyme & Instrument
Agilent SureCycler 8800
市場上領先的 cycling 速度和 sample 體積 10 ～ 100 μL 簡易快速可以選擇 96 well 和 384 well 操作盤 優秀的溫控設備讓各個 well 都能保持溫度的穩定 七吋的高解析度觸控螢幕讓操作上更為簡便 可以透過網路遠端操控儀器及監控儀器 Agilent 專業的技術支援可以幫助您應對各種 PCR 的問題
A-1331852_SDS_MedChemExpress
Inhibitors, Agonists, Screening LibrariesSafety Data Sheet Revision Date:May-24-2017Print Date:May-24-20171. PRODUCT AND COMPANY IDENTIFICATION1.1 Product identifierProduct name :A-1331852Catalog No. :HY-19741CAS No. :1430844-80-61.2 Relevant identified uses of the substance or mixture and uses advised againstIdentified uses :Laboratory chemicals, manufacture of substances.1.3 Details of the supplier of the safety data sheetCompany:MedChemExpress USATel:609-228-6898Fax:609-228-5909E-mail:sales@1.4 Emergency telephone numberEmergency Phone #:609-228-68982. HAZARDS IDENTIFICATION2.1 Classification of the substance or mixtureGHS Classification in accordance with 29 CFR 1910 (OSHA HCS)Acute toxicity, Oral (Category 4),H302Acute aquatic toxicity (Category 1),H400Chronic aquatic toxicity (Category 1),H4102.2 GHS Label elements, including precautionary statementsPictogramSignal word No data availableHazard statement(s)H302 Harmful if swallowed.H410 Very toxic to aquatic life with long lasting effects.Precautionary statement(s)P264 Wash skin thoroughly after handling.P270 Do not eat, drink or smoke when using this product.P273 Avoid release to the environment.P301 + P312 IF SWALLOWED: Call a POISON CENTER or doctor/ physician if you feel unwell.P330 Rinse mouth.P391 Collect spillage.P501 Dispose of contents/ container to an approved waste disposal plant.2.3 Other hazardsNone.3. COMPOSITION/INFORMATION ON INGREDIENTS3.1 SubstancesSynonyms:A1331852; A 1331852Formula:C38H38N6O3SMolecular Weight:658.81CAS No. :1430844-80-64. FIRST AID MEASURES4.1 Description of first aid measuresEye contactRemove any contact lenses, locate eye-wash station, and flush eyes immediately with large amounts of water. Separate eyelids with fingers to ensure adequate flushing. Promptly call a physician.Skin contactRinse skin thoroughly with large amounts of water. Remove contaminated clothing and shoes and call a physician.InhalationImmediately relocate self or casualty to fresh air. If breathing is difficult, give cardiopulmonary resuscitation (CPR). Avoid mouth-to-mouth resuscitation.IngestionWash out mouth with water; Do NOT induce vomiting; call a physician.4.2 Most important symptoms and effects, both acute and delayedThe most important known symptoms and effects are described in the labelling (see section 2.2).4.3 Indication of any immediate medical attention and special treatment neededTreat symptomatically.5. FIRE FIGHTING MEASURES5.1 Extinguishing mediaSuitable extinguishing mediaUse water spray, dry chemical, foam, and carbon dioxide fire extinguisher.5.2 Special hazards arising from the substance or mixtureDuring combustion, may emit irritant fumes.5.3 Advice for firefightersWear self-contained breathing apparatus and protective clothing.6. ACCIDENTAL RELEASE MEASURES6.1 Personal precautions, protective equipment and emergency proceduresUse full personal protective equipment. Avoid breathing vapors, mist, dust or gas. Ensure adequate ventilation. Evacuate personnel to safe areas.Refer to protective measures listed in sections 8.6.2 Environmental precautionsTry to prevent further leakage or spillage. Keep the product away from drains or water courses.6.3 Methods and materials for containment and cleaning upAbsorb solutions with finely-powdered liquid-binding material (diatomite, universal binders); Decontaminate surfaces and equipment by scrubbing with alcohol; Dispose of contaminated material according to Section 13.7. HANDLING AND STORAGE7.1 Precautions for safe handlingAvoid inhalation, contact with eyes and skin. Avoid dust and aerosol formation. Use only in areas with appropriate exhaust ventilation.7.2 Conditions for safe storage, including any incompatibilitiesKeep container tightly sealed in cool, well-ventilated area. Keep away from direct sunlight and sources of ignition.Recommended storage temperature:Powder-20°C 3 years4°C 2 yearsIn solvent-80°C 6 months-20°C 1 monthShipping at room temperature if less than 2 weeks.7.3 Specific end use(s)No data available.8. EXPOSURE CONTROLS/PERSONAL PROTECTION8.1 Control parametersComponents with workplace control parametersThis product contains no substances with occupational exposure limit values.8.2 Exposure controlsEngineering controlsEnsure adequate ventilation. Provide accessible safety shower and eye wash station.Personal protective equipmentEye protection Safety goggles with side-shields.Hand protection Protective gloves.Skin and body protection Impervious clothing.Respiratory protection Suitable respirator.Environmental exposure controls Keep the product away from drains, water courses or the soil. Cleanspillages in a safe way as soon as possible.9. PHYSICAL AND CHEMICAL PROPERTIES9.1 Information on basic physical and chemical propertiesAppearance White to light yellow (Solid)Odor No data availableOdor threshold No data availablepH No data availableMelting/freezing point No data availableBoiling point/range No data availableFlash point No data availableEvaporation rate No data availableFlammability (solid, gas)No data availableUpper/lower flammability or explosive limits No data availableVapor pressure No data availableVapor density No data availableRelative density No data availableWater Solubility No data availablePartition coefficient No data availableAuto-ignition temperature No data availableDecomposition temperature No data availableViscosity No data availableExplosive properties No data availableOxidizing properties No data available9.2 Other safety informationNo data available.10. STABILITY AND REACTIVITY10.1 ReactivityNo data available.10.2 Chemical stabilityStable under recommended storage conditions.10.3 Possibility of hazardous reactionsNo data available.10.4 Conditions to avoidNo data available.10.5 Incompatible materialsStrong acids/alkalis, strong oxidising/reducing agents.10.6 Hazardous decomposition productsUnder fire conditions, may decompose and emit toxic fumes.Other decomposition products - no data available.11.TOXICOLOGICAL INFORMATION11.1 Information on toxicological effectsAcute toxicityClassified based on available data. For more details, see section 2Skin corrosion/irritationClassified based on available data. For more details, see section 2Serious eye damage/irritationClassified based on available data. For more details, see section 2Respiratory or skin sensitizationClassified based on available data. For more details, see section 2Germ cell mutagenicityClassified based on available data. For more details, see section 2CarcinogenicityIARC: No component of this product present at a level equal to or greater than 0.1% is identified as probable, possible or confirmed human carcinogen by IARC.ACGIH: No component of this product present at a level equal to or greater than 0.1% is identified as a potential or confirmed carcinogen by ACGIH.NTP: No component of this product present at a level equal to or greater than 0.1% is identified as a anticipated or confirmed carcinogen by NTP.OSHA: No component of this product present at a level equal to or greater than 0.1% is identified as a potential or confirmed carcinogen by OSHA.Reproductive toxicityClassified based on available data. For more details, see section 2Specific target organ toxicity - single exposureClassified based on available data. For more details, see section 2Specific target organ toxicity - repeated exposureClassified based on available data. For more details, see section 2Aspiration hazardClassified based on available data. For more details, see section 212. ECOLOGICAL INFORMATION12.1 ToxicityNo data available.12.2 Persistence and degradabilityNo data available.12.3 Bioaccumlative potentialNo data available.12.4 Mobility in soilNo data available.12.5 Results of PBT and vPvB assessmentPBT/vPvB assessment unavailable as chemical safety assessment not required or not conducted.12.6 Other adverse effectsNo data available.13. DISPOSAL CONSIDERATIONS13.1 Waste treatment methodsProductDispose substance in accordance with prevailing country, federal, state and local regulations.Contaminated packagingConduct recycling or disposal in accordance with prevailing country, federal, state and local regulations.14. TRANSPORT INFORMATIONDOT (US)This substance is considered to be non-hazardous for transport.IMDGUN number: 3077Class: 9Packing group: IIIEMS-No: F-A, S-FProper shipping name: ENVIRONMENTALLY HAZARDOUS SUBSTANCE, SOLID, N.O.S.Marine pollutant: Marine pollutantIATAUN number: 3077Class: 9Packing group: IIIProper shipping name: Environmentally hazardous substance, solid, n.o.s.15. REGULATORY INFORMATIONSARA 302 Components:No chemicals in this material are subject to the reporting requirements of SARA Title III, Section 302.SARA 313 Components:This material does not contain any chemical components with known CAS numbers that exceed the threshold (De Minimis) reporting levels established by SARA Title III, Section 313.SARA 311/312 Hazards:No SARA Hazards.Massachusetts Right To Know Components:No components are subject to the Massachusetts Right to Know Act.Pennsylvania Right To Know Components:No components are subject to the Pennsylvania Right to Know Act.New Jersey Right To Know Components:No components are subject to the New Jersey Right to Know Act.California Prop. 65 Components:This product does not contain any chemicals known to State of California to cause cancer, birth defects, or anyother reproductive harm.16. OTHER INFORMATIONCopyright 2017 MedChemExpress. The above information is correct to the best of our present knowledge but does not purport to be all inclusive and should be used only as a guide. The product is for research use only and for experienced personnel. It must only be handled by suitably qualified experienced scientists in appropriately equipped and authorized facilities. The burden of safe use of this material rests entirely with the user. MedChemExpress disclaims all liability for any damage resulting from handling or from contact with this product.Caution: Product has not been fully validated for medical applications. For research use only.Tel: 609-228-6898 Fax: 609-228-5909 E-mail: tech@Address: 1 Deer Park Dr, Suite Q, Monmouth Junction, NJ 08852, USA。
超高效液相色谱-串联质谱法测定化妆品中15种N-亚硝胺化合物
第42 卷第 11 期2023 年11 月Vol.42 No.111469~1478分析测试学报FENXI CESHI XUEBAO（Journal of Instrumental Analysis）超高效液相色谱-串联质谱法测定化妆品中15种N-亚硝胺化合物汪毅1，梁文耀1，何国山1，陈张好2，周智明2，吴谦1，席绍峰1，谭建华1*（1．广州质量监督检测研究院，国家化妆品质量检验检测中心（广州），广东广州511447；2．广东省药品检验所，广东广州510663）摘要：采用超高效液相色谱-串联质谱（UPLC-MS/MS）建立了化妆品中15种痕量N-亚硝胺化合物的分析方法。
水剂样品以水或乙腈分组超声提取，膏霜乳液样品采用亚铁氰化钾-乙酸锌溶液沉淀大分子或者饱和氯化钠-乙腈盐析分组处理后，以Agilent Poroshell 120 SB-Aq（100 mm×3.0 mm，2.7 μm）色谱柱分离，经大气压化学电离源（APCI）电离，多反应监测模式检测，以同位素内标法定量。
结果表明，15种N-亚硝胺化合物在相应质量浓度范围内线性关系良好（r2＞0.995），检出限和定量下限分别为5~15 ng/g和15~45 ng/g。
水、乳、膏霜3种化妆品基质在25、50、100 ng/g加标水平下的平均回收率为88.0%~111%，相对标准偏差（RSD，n=6）为1.4%~9.8%。
该方法用于市售化妆品检测，发现13批次样品检出N-亚硝基二乙醇胺（NDELA），其中1批次超限量值。
方法的专属性强，灵敏度高，精密度好，解决了N-亚硝胺化合物稳定性差、易被干扰等问题，适用于化妆品中15种N-亚硝胺化合物的痕量测定。
关键词：N-亚硝胺化合物；化妆品；超高效液相色谱-串联质谱法（UPLC-MS/MS）；大气压化学电离源中图分类号：O657.63；O623.732文献标识码：A 文章编号：1004-4957（2023）11-1469-10 Determination of Fifteen N-nitrosamine Compounds in Cosmetics by Ultra Performance Liquid Chromatography-TandemMass SpectrometryWANG Yi1，LIANG Wen-yao1，HE Guo-shan1，CHEN Zhang-hao2，ZHOU Zhi-ming2，WU Qian1，XI Shao-feng1，TAN Jian-hua1*（1．Guangzhou Quality Supervision and Testing Institute，National Quality Supervision and Testing Center for Cosmetics（Guangzhou），Guangzhou 511447，China；2．Guangdong Institute for Drug Control，Guangzhou 510663）Abstract：An ultra performance liquid chromatography-tandem mass spectrometric（UPLC-MS/MS）method was established for detecting 15 trace N-nitrosamine compounds in cosmetics. The final estab⁃lished method involved ultrasonic extraction of cosmetics using water or acetonitrile for different com⁃pounds. The samples were treated with potassium ferrocyanide-zinc acetate solution for precipitating macromolecules or saturated sodium chloride-acetonitrile for salting out.An Agilent Poroshell 120 SB-Aq（100 mm × 3.0 mm，2.7 μm） chromatography column was used for separation，followed by atmospheric pressure chemical ionization（APCI） source and multiple reaction monitoring mode detec⁃tion in the isotope internal standard method for quantification. The result showed good linearity（r2> 0.995） for the 15 N-nitrosamine compounds in their respective concentration ranges，with detection and quantitation limits of 5-15 ng/g and 15-45 ng/g，respectively.The average recoveries for the three cosmetic matrices（aqueous，emulsion，cream） at spiked levels of 25，50，100 ng/g were be⁃tween 88.0% and 111%，with relative standard deviations（RSD，n=6） of 1.4%-9.8%. The method was applied to the detection of commercial cosmetics and N-nitrosodiethanolamine（NDELA） was de⁃tected in 13 batches，with one batch exceeding the limit. The strong specificity，high sensitivity，and good precision made the method could solve the problems of poor stability and easy interference ofdoi：10.19969/j.fxcsxb.23051602收稿日期：2023－05－16；修回日期：2023－06－10基金项目：广东省药品监督管理局化妆品风险评估重点实验室专项（2021ZDZ03）；广东省市场监督管理局科技项目（2022CZ06）∗通讯作者：谭建华，博士，正高级工程师，研究方向：色谱－质谱检测技术研究，E-mail：tanjianhua0734@第 42 卷分析测试学报N-nitrosamine compounds，and was suitable for the trace determination of 15 N-nitrosamine com⁃pounds in cosmetics.Key words：N-nitrosamine compounds；cosmetics；ultra performance liquid chromatography-tan⁃dem mass spectrometry（UPLC-MS/MS）；atmospheric pressure chemical ionization（APCI） sourceN-亚硝胺化合物是一类具有N-亚硝基结构的化合物，因取代基的不同，形成了种类繁多的同系物，目前已发现超过300种［1］。
致病疫霉菌效应蛋白Pi05440毒性功能验证及寄主候选靶标筛选
核农学报2024，38（3）：0434~0442Journal of Nuclear Agricultural Sciences致病疫霉菌效应蛋白Pi05440毒性功能验证及寄主候选靶标筛选张蝶陈胜男赵迪王荟洁王洪洋 *刘晶 *（云南师范大学，云南省马铃薯生物学重点实验室，云南昆明650500）摘要：致病疫霉菌（Phytophthora infestans）侵染时会分泌大量效应蛋白进入寄主细胞，通过操纵寄主靶标抑制植物免疫反应。
为研究致病疫霉菌效应蛋白Pi05440的功能，本研究重点分析了Pi05440的蛋白特征、毒性功能及鉴定其寄主靶标；利用生物信息学数据库，预测Pi05440的保守结构域和信号肽。
构建pRI101-GFP-Pi05440表达载体用于Pi05440的亚细胞定位和毒性功能分析；同时，利用酵母双杂交技术对Pi05440的寄主靶标蛋白进行了筛选和鉴定。
结果表明，Pi05440基因全长969 bp，编码322个氨基酸。
结构预测结果显示Pi05440含有3个典型的KAZAL功能域。
亚细胞定位结果表明Pi05440定位在质膜和细胞间隙。
在本氏烟中瞬时表达该基因显著促进致病疫霉菌扩展。
通过酵母双杂交筛选，初步鉴定到3个Pi05440的候选靶标蛋白，分别为马铃薯过氧化氢酶12、马铃薯几丁质酶以及马铃薯MYB-like A蛋白。
本研究为探究致病疫霉菌效应蛋白Pi05440及其靶标蛋白如何调控植物免疫提供了重要线索。
关键词：致病疫霉菌；效应蛋白；亚细胞定位；酵母双杂交；靶标蛋白DOI：10.11869/j.issn.1000‑8551.2024.03.0434马铃薯（Solanum tuberosum）富含碳水化合物、维生素、矿物质和抗氧化物质等营养成分，对人类健康和可持续农业发展至关重要［1］。
然而，马铃薯生产过程中会面临许多病害的威胁，其中最为严重的是由致病疫霉菌（Phytophthora infestans）引起的晚疫病。
高效液相色谱-质谱_质谱法测定猪肉中11种磺胺类药物残留
高效液相色谱-质谱/质谱法测定猪肉中11种磺胺类药物残留发布时间：2022-08-01T08:38:02.400Z 来源：《科学与技术》2022年第6期作者：许计元刘淑梅李梦平[导读] 利用高效液相色谱-质谱/质谱仪建立猪肉中11种磺胺类药物残留的检测方法。
许计元,刘淑梅,李梦平安徽创佳安全环境科技有限公司利用高效液相色谱-质谱/质谱仪建立猪肉中11种磺胺类药物残留的检测方法。
本方法用乙腈作为提取溶剂，正己烷去除油脂，液相初始流动相定容，0.1%甲酸水与纯乙腈作为流动相，使用的色谱柱为安捷伦InfinityLab Poroshell 120 EC C18(3.0mm×150mm,2.7μm)，多重反应监测（MRM）模式下采集数据，基质配标法定量。
11种磺胺类药物在1ug/kg-10ug/kg范围内线性良好，在4ug/kg加标水平下，回收率在86.9%-103.6之间，相对标准偏差在1.35%-3.28%之间。
本方法前处理简单，回收率、精密度与准确度均可以满足使用要求。
关键词：液相色谱；质谱；猪肉；磺胺Determination of 11 sulfonamides residues in pork by high performance liquid chromatography-mass spectrometry/mass spectrometryXu Ji-Yuan,Liu Shu-Mei,Li Meng-Ping（Anhui Chuangjia Safety environment Technology Co., LTD）A method for the determination of 11 sulfonamides residues in pork was established by high performance liquid chromatography-mass spectrometry. The chromatographic column was agilent InfinityLab Poroshell 120 EC C18(3.0mm×150mm,2.7μm), using acetonitrile as the extraction solvent, n-hexane for oil removal, and 0.1% formic acid water as the mobile phase. Data were collected in multiple response monitoring (MRM) mode and quantified by matrix coordination method. The linearity of 11 sulfonamides was good in the range of 1ug/kg-10ug/kg. At the spiked level of4ug/kg, the recoveries were 86.9%-103.6, and the relative standard deviations (RSDS) were 1.35%-3.28%. The method is simple in pretreatment, and the recovery, precision and accuracy can meet the application requirements.Key words: liquid chromatography; Mass spectrometry; Pork; Conditions磺胺类药物（SAs）是指具有对氨基苯磺酰胺结构药物的总称，为人工合成的抗菌药，该类药物具有抗菌谱广、抗菌效果明显、性质稳定、价格便宜等优点, 目前大量用于防治畜禽细菌性感染疾病。
黄皮酰胺生物电子等排体AchE抑制剂的设计合成及分子对接研究
溶液，调 pH 至中性，析出沉淀，滤过，滤饼用乙酸 4.379（d，J=3.0 Hz，1H，C7-H），6.00（br，1H，
乙 酯 重 结 晶 得 片 状 结 晶 0.207 g，产 率 68.5%，mp 195.8~196.5 ℃。
C3-OH，D2O 交换后消失），6.753-7.314（m，10H， Ar-H）。
北京泰克仪器有限公司；RE-52A 型旋转蒸发器，巩 义市予华仪器有限公司。
130 ℃搅拌反应，TLC（硅胶 GF254，乙酸乙酯︰石油 醚 =4 ︰ 1，紫外灯（UV）下观察）跟踪，1 h 后升温
甲酸，分析纯，江苏强盛化工有限公司；氧化苯 至 165 ℃，反应 5 h 后原料点消失。反应液中加入
乙烯，分析纯，上海乙基化工有限供公司。
黄皮酰胺和合成路线最早由拜尔公司设计 ， [11] 之后中国医学科学院药物研究所黄量院士设计出了 黄皮酰胺的仿生合成路线 [12]，该法以苯甲醛和氯乙
2- 吡咯烷酮类化合物，其结构中可供修饰的位置较 多，其中 7 位羟基就是一个值得改造的位置，因为黄 皮酰胺所具有的促智和保肝作用与其 7 位羟基的存 在有着密切联系。根据生物电子等排原理 [13]，羟基 和氨基是一对经典的一价生物电子等排体，将黄皮酰 胺 7 位羟基用氨基替换后，可能得到与黄皮酰胺类似 或更好药理活性的化合物。刘卡特反应（LeuckartWallach Reaction）不需要催化氢化就能一步直接将 羰基转变为氨基 [14]。该法原料易得，不需特殊设备， 产品质量好，产率较高，反应所用的甲酸是一种可再 生的还原剂，绿色环保 [15]，其反应过程见图 2。
基金项目：湖南省卫计委科研课题（B2015-174）。 作者简介：唐敏（1984—），男，湖南衡阳人，博士，讲师，研究方向：中药作用物质基础及作用机理。 通信作者：邓凤君（1973—），女，益阳沅江人，博士，副教授，研究方向：神经药理。