H4SiW6Mo6O40-Doped Polyaniline-Synthesis, characterization and catalytic properties of acetals a
静电纺丝法制备纳米氧化铟锡及其导电性能
收稿日期:2020⁃10⁃06。
收修改稿日期:2020⁃11⁃13。
中央高校基本业务费(No.3207042009C2)资助。
#共同第一作者。
*通信联系人。
E⁃mail :************.cn ,***********.cn第37卷第3期2021年3月Vol.37No.3491⁃498无机化学学报CHINESE JOURNAL OF INORGANIC CHEMISTRY静电纺丝法制备纳米氧化铟锡及其导电性能任鑫川#刘苏婷#李志慧宋承堃代云茜*孙岳明*(东南大学化学化工学院,南京211189)摘要:采用静电纺丝-溶胶凝胶法,以SnCl 2、InCl 3、聚乙烯吡咯烷酮(PVP)等为原料,乙醇胺为水解控制剂,合成了超细氧化铟锡(ITO)纳米纤维及富氧缺陷的ITO 纳米颗粒。
采用透射电子显微镜(TEM)、选区电子衍射(SAED)、扫描电子显微镜(SEM)、热重分析(TGA)、X 射线衍射(XRD)、X 射线电子能谱(XPS)、四探针电阻仪,系统研究了超细ITO 纤维及颗粒的形貌、晶型、氧缺陷及导电性能。
在400℃空气煅烧后,纤维中的PVP 高分子骨架发生热分解,获得超细、多孔ITO 纳米纤维,晶型为立方相。
进一步升高煅烧温度至800℃,ITO 纳米纤维转变为富氧缺陷的纳米颗粒,晶格氧空位含量高达38.9%。
随着煅烧温度升高,Sn 4+掺入到In 2O 3晶格中,发生晶格膨胀,晶面间距增大。
煅烧温度由400℃升高至800℃,未发生立方相向六方相的转变,晶型稳定,晶粒尺寸从32nm 生长到44nm ,晶格应变(ε0)从1.943×10-3减小至1.422×10-3,应变诱导的晶格弛豫逐渐减小。
此外,高温煅烧可抑制In 2O 3晶粒(111)晶面的增长,随着In 2O 3的(400)与(222)晶面比值(I (400)/I (222))的增加,ITO 电导率逐渐升高。
在800℃获得的ITO 纳米颗粒导电率最高。
UHPLC-MS
第43 卷 第 5 期2024 年5 月Vol.43 No.5663~673分析测试学报FENXI CESHI XUEBAO (Journal of Instrumental Analysis )UHPLC-MS/MS 测定化妆品中67种植物提取物标识成分张秋炎,黄芳,梁维维,廖均涛,吴惠勤,罗辉泰*(广东省科学院测试分析研究所(中国广州分析测试中心),广东省化学测量与应急检测技术重点实验室,广东省中药质量安全工程技术研究中心,广东 广州 510070)摘要:建立了超高效液相色谱-串联质谱(UHPLC-MS/MS )测定化妆品中67种植物提取物标识成分的方法。
化妆品样品经甲醇(含1%甲酸)超声提取,样液在0.1%甲酸溶液-乙腈流动相体系下经Agilent RRHD Eclipse Plus Zorbax C 18(3.0 mm×100 mm ,1.8 μm )色谱柱梯度洗脱分离。
采用电喷雾正、负离子模式分别对67种成分进行定性定量分析,其中正离子采用多反应监测(MRM )方式,负离子采用动态多反应监测(DMRM )方式,以基质匹配外标法定量。
以膏霜、乳液基质为代表,67种成分在各自质量浓度范围内线性关系良好,相关系数(r 2)均大于0.99;检出限为0.002 6~1.7 μg/g ,定量下限为0.008 0~5.0 μg/g ;3个不同加标水平下,膏霜、乳液基质的平均回收率分别为85.6%~117%和82.7%~116%,相对标准偏差(RSD ,n =6)分别为1.0%~12%和0.90%~12%。
该法简单快速,灵敏度高,适用于化妆品中67种植物提取物标识成分的定性鉴定和含量测定。
关键词:超高效液相色谱-串联质谱法;化妆品;植物提取物;标识成分中图分类号:O657.7;TQ658文献标识码:A 文章编号:1004-4957(2024)05-0663-11Determination of 67 Indicative Components from Plant Extracts in Cosmetics by Ultra High Performance Liquid Chromatography-Tandem Mass SpectrometryZHANG Qiu -yan ,HUANG Fang ,LIANG Wei -wei ,LIAO Jun -tao ,WU Hui -qin ,LUO Hui -tai *(Guangdong Provincial Engineering Research Center for Quality and Safety of Traditional Chinese Medicine ,Guangdong Provincial Key Laboratory of Chemical Measurement and Emergency Test Technology ,Institute ofAnalysis ,Guangdong Academy of Sciences (China National Analytical Center ,Guangzhou ),Guangzhou 510070,China )Abstract :A new method for the simultaneous and rapid determination of 67 indicative componentsfrom plant extracts in cosmetics by ultra high performance liquid chromatography-tandem mass spec⁃trometry (UHPLC-MS/MS ) was established. The cosmetic samples were dispersed with methanol (1% formic acid ) and ultrasonic extraction. The filtrate was analyzed by a Agilent RRHD Eclipse Plus Zor⁃bax C 18 chromatographic column (3.0 mm×100 mm ,1.8 μm ) with mobile phase consisted of 0.1% formic acid aqueous solution and acetonitrile. 67 indicative components from plant extracts were ana⁃lyzed in the electrospray ionization source ,including positive ion scanning with multiple reaction monitoring mode (MRM ) and negative ion scanning with dynamic multiple reaction monitoring mode (DMRM ) respectively. Creams and lotions were choosed as the representative matrix. The 67 indica⁃tive components showed good linearity with the correlation coefficients (r 2) greater than 0.99 in their respective mass concentration ranges. The detection limits (LODs ) of 67 indicative components were in the range of 0.002 6-1.7 μg/g ,and the quantitation limits (LOQs ) were in the range of 0.008 0-5.0 μg/g. For cream and lotion samples ,the average recoveries of 67 indicative components at three different concentration levels ranged of 85.6%-117% and 82.7%-116%,respectively ; with relative standard deviations (RSDs ,n =6) ranged of 1.0%-12% and 0.90%-12%. The established method isdoi :10.12452/j.fxcsxb.24010601收稿日期:2024-01-06;修回日期:2024-02-28基金项目:广东省科学院打造综合产业技术创新中心行动资金项目“高端医疗健康与高效生物转化关键技术研究及应用”(2022GDASZH-2022010110)∗ 通讯作者:罗辉泰,副研究员,研究方向:色谱-质谱分析技术应用,E -mail :luohuitai@研究报告664分析测试学报第 43 卷simple,rapid,effective,high sensitive,and is suitable for the qualitative identification and con⁃tent determination of 67 indicative components from plant extracts in cosmetics.Key words:UHPLC-MS/MS;cosmetics;plant extracts;indicative components随着化妆品市场的不断完善,“安全、天然、绿色”逐渐成为化妆品高质量发展的主题[1]。
固相萃取-_高效液相色谱-_串联质谱法同时测定海产品中微囊藻毒素和鱼腥藻毒素
分析检测固相萃取-高效液相色谱-串联质谱法同时测定海产品中微囊藻毒素和鱼腥藻毒素吕晓静,鞠光秀,曲 欣,汪 勇,于红卫*(1.青岛市疾病预防控制中心/青岛市预防医学研究院,山东青岛 266033;2.岛津企业管理(中国)有限公司,北京 100020)摘 要:目的:建立固相萃取-高效液相色谱-串联质谱法同时测定海产品中7种微囊藻毒素和2种鱼腥藻毒素的方法。
方法:样品经80%乙腈提取,HLB小柱净化后,采用MRM模式进行分析,外标法定量。
结果:7种微囊藻毒素和2种鱼腥藻毒素在0.5~50.0 μg·L-1范围内线性关系良好,检出限为0.3 μg·kg-1,回收率为75.5%~98.8%,相对标准偏差在1.5%~5.4%。
结论:该方法重现性较好、灵敏度高、成本低,可以实现海产品中的鱼腥藻毒素和微囊藻毒素的同时检测。
关键词:微囊藻毒素;鱼腥藻毒素;固相萃取(SPE);高效液相色谱-串联质谱法(HPLC-MS/MS)Simultaneous Determination of Microcystins and Anatoxins in Marine Products by High Performance Liquid Chromatography-Tandem Mass Spectrometry with SolidPhase ExtractionLYU Xiaojing, JU Guangxiu, QU Xin, WANG Yong, YU Hongwei*(1.Qingdao Municipal Center For Disease Control & Prevention/Qingdao Institute of Preventive Medicine, Qingdao266033, China; 2.Shimadzu (China) Co., Ltd., Beijing Branch, Beijing 100020, China) Abstract: Objective: A method for simultaneous determination of 7 microcystins (MCs) and 2 Anatoxins (AnTXs) in marine products was achieved by solid phase extraction (SPE)-high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS). Method: The sample was extracted with 80% acetonitrile, purified by HLB small column, analyzed using MRM mode, and quantified using external standard method. Result: The linear ranges for 7 MCs and 2 AnTXs were 0.5~50.0 μg·L-1. The limits of detection were 0.3 μg·kg-1. The recoveries of the 7 MCs and 2 AnTXs spiked in blank marine products ranged from 75.5% to 98.8% with the relative deviations of 1.5%~5.4%. Conclusion: The method has the advantages of good reproducibility, high sensitivity and low cost, and can achieve simultaneous detection of fishy algae toxins and microcystins in seafood.Keywords: microcystin; anatoxin; solid phase extraction (SPE); high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS)微囊藻毒素(Microcystins,MCs)和鱼腥藻毒素(Anatoxins,AnTXs)是两种典型的蓝细菌毒素[1]。
DiI-Labeled Oxidized Low Density Lipoprotein, Human
DiI-Labeled Oxidized Low Density Lipoprotein,HumanCat No:L8990Size:500ug protein/vialConcentration:1.5mg/mL protein(Based on actual label concentration).Purity:98%,is determined agarose gel electrophoresis.Specifications:0.22micron membrane filtered,aseptically filled.Cell Culture Tested.Storage:This product is stable for6weeks after receipt when handled aseptically and stored at2-8°C(Do not freeze).After prolonged storage,some precipitate may be observed.This is normal for this product.Clarify out the aggregates by spinning in centrifuge tube for2minutes.Introduction:DiI-Ox-LDL,oxidized Low Density Lipoprotein,labeled with1,1'-dioctadecyl–3,3,3',3'-tetramethyl-indocarbocyanine perchlorate,labels both vascular endothelial cells and macrophages.It can be used to identify and/or isolate these cells from mixed cell populations and investigate uptake of modified LDL by different cell types.When cells are labeled with DiI-Ox-LDL,the lipoprotein is degraded by lysosomal enzymes and the DiI(fluorescent probe)accumulates in the intracellular beling cells with DiI-Ox-LDL has no effect on cell viability.Pure cultures of vascular endothelial cells can be isolated from complex primary cultures using fluorescent activated cell sorting based on their increased metabolism of the DiI-Ox-LDL.Contaminating cell types(fibroblasts,smooth muscle,pericytes,epithelial cells) are not labeled.Macrophages can be differentiated from mixed cell populations(including endothelial cells)because they are more brightly beling endothelial cells with DiI-Ox-LDL has many advantages over labeling other endothelial cell associated antigens.The labeling procedure is one step,and once the cells are labeled,the fluorescent probe(DiI)is not removed by Trypsin.Both low density and confluent cultures of vascular endothelial cells are effectively labeled.No other cell type(other than macrophages)is labeled to the same level as vascular endothelial cells.Each lot of DiI-Ox-LDL is evaluated for the specific labeling of bovine aortic endothelial cells and murine macrophages to assure consistent results.A complete labeling protocol is included with each shipment.Protocol第1页共2页1.Dilute DiI-Ox-LDL to20-50ug/ml in growth media.2.Add to cells and incubate for4hours at37ºC.3.Remove media.4.Wash cells several times with probe-free media.5.Visualize via Fluorescence Microscopy and/or trypsinize(or EDTA)for cell sorting.A.Fluorescence Microscopy:Visualize using standard rhodamine excitation:emission filters(or suggested wavelengths excitation:emission at 549nm:565nm).If fixation is desired use3%formaldehyde in PBS.(Do not use methanol or acetone fixation-DiI is soluble in organic solvents).Note:A positive culture must be stained for comparison purposes.B.Cell Sorting:Label as in steps1-5.Trypsinize or treat cultures with EDTA to produce a single cell e labeled pure cultures of positive and negative cell types to set gates on the cell sorter.Suggested Wavelengths for Cell Sorting:Excitation:514/549nm.Emission:565nmFixation and Mounting of DiI Labeled Cells1.Wash3times in PBS.2.Fix in3%formaldehyde/PBS for20minutes at room temperature.3.Rinse5seconds in distilled water at room temperature.4.Drain liquid onto chem-wipe.5.Invert cover,slip on a drop of90%Glycerol and10%PBS onto a microscope slide.6.Seal with Kroenigs wax,also known as cover glass cement(Pfaltz&Bauer,Waterbury,CT06708).Do not usenail polish.Store at-20°C.第2页共2页。
硅氧烷化合物的合成与应用进展
材料工程Journal of Materials Engineering第4 9卷 第4期2021年4月 第13-22页Vol. 4 9 No. 4Apr. 2021 pp. 13 — 22硅氧烷化合物的合成与应用进展Research progress in synthesis andapplication of siloxane compounds程玉桥,路双,冯喆,赵文辉,张治婷,赵越(天津工业大学化学与化工学院,天津300387)CHENG Yu-qiao ,T/U Shuang ,FENG Zhe,ZHAO Wen-hui ,ZHANG Zhi-t.ing,ZHAO Yue(School of Chemistry and Chemical Engineering ,TiangongUniversity? Tianjin 300387 , China)摘要:基于硅氧键特点以及不同条件的化学反应是构建结构迥异、性能独特的新型有机/无机硅氧功能材料的重要方法,近年来,引起了学术界的普遍关注。
新型硅氧功能材料兼具有机/无机化合物性质,以其良好的生物相容性、耐高低 温性以及电绝缘性能被广泛应用于众多领域。
本文综述了硅氧烷化合物设计、合成与应用的研究领域及发展现状,重点 介绍线性结构(一维结构)、非线性结构(二维结构)、多面体低聚倍半硅氧烷化合物(三维结构)以及有机/无机杂化硅氧烷化合物的设计及合成方法,并通过研究可拉伸聚硅氧烷弹性体、硅氧烷化合物涂层、新型驱油用硅氧功能材料等多种方式以增进硅氧烷化合物在生物医学、航空航天、功能材料及三次采油方面的应用进展。
关键词:线性结构;非线性结构;多面体低聚倍半硅氧烷;有机/无机杂化硅氧烷化合物;合成方法doi : 10. 11868/. issn. 1001-4381.2020. 000125中图分类号:O613.72文献标识码:A 文章编号:10014381(2021)04-0013-10Abstract : Chemical reactions based on the characteristics of silicon-oxygen bonds and differentconditions are important methods to construct new organic/inorganic siloxane functional materialswith very different structures and unique properties , which have aroused widespread attention in the academic community. The new silicon-oxygen functional materials have both organic/inorganic compound properties , and are widely used in many fields for their good biocompatibility , high and lowtemperature resistance , and electrical insulation properties. The research fields and developmentstatus of the design , synthesis and application of siloxane compounds were reviewed in this paper , focusing on the design and synthesis methods of linear structure (one-dimensional structure ),nonlinear structure (t.wo-climensional structure ) , polyhedral oligomeric silsesquioxane compounds (three-dimensional structure) and organic/inorganic hybrid siloxane compounds , and the application progress of siloxane compounds in biomedicine , aerospace , functional materials and tertiary oilrecovery will be promoted by studying stretchable polysiloxane elastomer , siloxane compound coating , new silicone functional materials for oil displacement and so on.Key words : linear structure ; nonlinear structure ; polyhedral oligomeric silsesquioxane ; organic/inorganic hybrid siloxane compounds ;synthesis method随着材料科学的不断发展,硅氧烷化合物因其良 好的耐热性、生物相容性、高透气性和高绝缘性能在诸 多领域占据着重要地位。
有机硅表面活性剂的特点及用于农药的益处
10.00
0.00
1天
3天
7天
4000X 8000X
有机硅表面活性剂的特点及用于农药的益处
防效%
Silwet408(0.1%)+48%乐斯本乳油防治小菜蛾
92.00
90.00
88.00 86.00
84.00
82.00
80.00
78.00 76.00
74.00
72.00
1天
3天
7天
2000X 4000X
1%阿维菌素EC +GE
1%阿维菌素EC +OP-10
1%阿维菌素EC +JFC
稀释倍数或浓度 \
2000倍 0.05% 0.10% 0.05% 0.10% 0.05% 0.10%
表面张力(mN/m) 72.4 35.8 22.6 22.2 32.4 34 31 29.8
有机硅表面活性剂的特点及用于农药的益处
0.05% 681.4 489.4 443.2 604 495
+Silwet408
0.10% 961.1 940.5 790.8 682.3 899.9
0.05% 28.26 19.63 22.8 35.48 35.78
1%阿维菌素EC +OP-10 0.10% 30.18 21.32 26.1 36.01 36.12
Silwet L-77表面活性剂
聚乙氧基三硅氧烷(TSE)
有机硅表面活性剂的特点及用于农药的益处
有机硅表面活性剂的特点及用于农药的益处
Silwet农用助剂的特点
• 超级展扩剂 • 增加喷雾药液覆盖面 • 可有效减少喷雾量 • 促进喷雾药液快速吸收 • 非离子表面活性剂 • 符合环保要求
肝病专业英语词汇
3α-羟类固醇脱氢酶(Y' 蛋白) γ -谷氨酰转移酶 γ-氨基丁酸 甲胎蛋白 人兽共患病 异种肝移植 脂肪性纤维瘤,黄色瘤 黄嘌呤氧化酶 黄斑瘤 全球移植中心名录 窗口期 肝豆状核变性 肥达反应 外斐反应 韦克斯勒成人智力测验 呕吐 视觉诱发电位 病毒学应答 病毒复制 病毒性肝炎 静脉-静脉转流 VOD 肝小静脉闭塞病 静脉-动脉转流 血管活性肽 静脉曲张 胆管消失综合征 疫苗 熊去氧胆酸 尿胆素原 尿胆素 二磷酸尿苷异构酶 尿素生成 鸟氨酸循环,尿素循环 上消化道出血 粗纤维调节素 肝未分化肉瘤 充盈不足学说 非结合高胆红素血症 游离胆红素,非结合胆红素 超声(波)检查法
短潜伏期肝炎 移动性浊音 腹水白蛋白浓度梯度 血清肝炎 血清诊断 血清胆红素 血清白蛋白 血清学应答 乙肝血清学检查 血清转换 败血症相关胆汁淤积 正链,有义链 镇静剂 次级胆酸 海蓝组织细胞增多症 硬化疗法 硬化性胆管炎 日本血吸虫病 湄公血吸虫 曼氏血吸虫 日本血吸虫 间插血吸虫 埃及血吸虫 血吸虫 瘢痕形成期 粗面内质网 滚环机制(环状DNA复制的机理) RNA干扰 核酶 核糖体 胆固醇逆向转运
伤寒 Ⅳ型胶原 Ⅲ型前胶原 甲肝和乙肝疫苗 抑癌基因 肿瘤坏死因子 肝结核 滋养体 甘油三酯 颠换效应 经颈静脉肝内门腔分流 转换 输血传染的病毒 输血性肝炎 转化生长因子
transcatheter arterial chemoembolization 肝动脉化疗栓塞 trans-activation toxic hepatitis total cholesterin total bilirubin tomor necrosis factor tocopherol TNF-related apoptosis inducing ligand tissue inhibitor of metalloproteinase thymosin Thymopolypeptides for Injection thromboxane the core promoter element tentative diagnosis tension of muscle tenderness Telbivudine taurocholic acid taurochenodeoxycholate acid systemic inflammatory response syndrome syncytial giant-cell hepatitis sustained virus response sustained response 反式激活 中毒性肝炎 总胆固醇 总胆红素 肿瘤坏死因子 生育酚,维生素E 肿瘤坏死因子相关凋亡诱导配体 基质金属蛋白酶组织抑制物 胸腺肽 胸腺肽 血栓素 核心启动子元件,启动子核心元件 暂时的(假定的)诊断,试验性诊断 肌张力 压痛 LdT 牛(磺)胆酸 牛磺鹅(去氧)胆酸盐,牛磺鹅(脱氧)胆酸盐 全身炎症反应综合症 融合巨细胞性肝炎 持续病毒应答 持久应答
类普鲁士蓝的制备及其活化PMS降解双酚S
化工进展Chemical Industry and Engineering Progress2023 年第 42 卷第 12 期类普鲁士蓝的制备及其活化PMS 降解双酚S杨有威1,2,3,曾亦婷1,2,郭昌胜3,罗玉霞1,2,高艳1,2,王春英1,2(1 矿冶环境污染防控江西省重点实验室,江西 赣州 341000;2 江西理工大学资源与环境工程学院, 江西 赣州341000;3 中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012)摘要:通过简单共沉淀法合成了类普鲁士蓝化合物(CoFe-PBA ),用于活化过一硫酸盐(PMS )降解有机污染物双酚S (BPS )。
使用扫描电镜、X 射线衍射、X 射线光电子能谱等手段对CoFe-PBA 进行表征,结果表明CoFe-PBA 由紧密结合的Co 3[Fe(CN)6]2构成,为纳米级,表面均匀分布着C 、Fe 、Co 、O 元素,具有丰富的活性位点。
催化剂投加量300mg/L 、PMS 投加量400mg/L 、pH=5.89条件下,CoFe-PBA/PMS 降解体系40min 内去除73.77%的BPS ,对酸性和共存离子(SO 42−、NO 3−和Cl −)敏感,碱性环境能促进PMS 快速活化,重复实验显示该体系具有良好稳定性,使用4次后仅下降26.70%,活化性能优于其他材料。
机理分析表明,CoFe-PBA 与PMS 相互作用,作用过程中改变了金属位点价态,发生电子转移,产生各种活性物质降解BPS ,其主要作用活性物种为1O 2;产物分析表明,在CoFe-PBA 活化PMS 系统中,BPS 可历经三种路径最终转化为开环产物及CO 2和H 2O 。
本研究通过低耗能、低成本、快速简易的方法制备CoFe-PBA ,可为活化PMS 绿色降解BPS 提供思路。
关键词:双酚S ;过硫酸盐活化;类普鲁士蓝;过渡金属中图分类号:X703 文献标志码:A 文章编号:1000-6613(2023)12-6676-11Preparation of Prussian blue and its activation of PMS fordegrading bisphenol SYANG Youwei 1,2,3,4,ZENG Yiting 1,2,GUO Changsheng 3,LUO Yuxia 1,2,GAO Yan 1,2,WANG Chunying 1,2(1 Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy,Ganzhou 341000, Jiangxi, China; 2 School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China; 3 State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences, Beijing 100012, China)Abstract: A Prussian blue-like compound (CoFe-PBA) was synthesized by a simple co -precipitation method for activating permonosulfate (PMS) to degrade organic pollutant bisphenol S (BPS). CoFe-PBA showed high activity on the removal of bisphenol S from activated PMS. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were used to characterize CoFe-PBA. The results showed that CoFe-PBA was composed of Co 3[Fe(CN)6]2, which was in nanometer scale. The surface was evenly distributed with C, Fe, Co, O elements, with abundant active sites. Under the conditions of catalyst研究开发DOI :10.16085/j.issn.1000-6613.2023-0803收稿日期:2023-05-15;修改稿日期:2023-07-21。
不同酶消化法提取猪原代肝细胞的效果比较
532024.4·试验研究0 引言猪圆环病毒(PCV )是Circoviridae 科Circovirus 属的一种无囊膜的单链环状DNA 病毒。
在已知的4个血清型中,PCV2为猪易感的致病性病毒[1]。
PCV2感染会诱导宿主免疫抑制引起猪圆环病毒病(PCVD ),包括断奶仔猪多系统衰竭综合征、新生仔猪先天性脑震颤、皮炎与肾病综合征、猪呼吸道病综合征、母猪繁殖障碍等,给全世界养猪业带来较大的经济损失,是世界各国的兽医与养猪业者公认的造成重大影响的猪传染病[2]。
PCV2的感染在猪生长发育的不同阶段有不同的组织嗜性。
但无论是胎儿阶段还是出生后,肝细胞都是PCV2感染和复制的靶细胞。
因此,PCV2也被视为一种能够诱导猪肝炎的病毒[3]。
且PCV2诱导的肝细胞凋亡在PCV2引发的相关病变和疾病的发病机制中具有关键性作用[4]。
因此,方便、快捷地获取大量有活性的猪肝细胞对于研究PCVD 的致病机制具有重大意义。
目前获取肝细胞常用的方法主要包括机械分离细胞法、非酶分离细胞法、离体酶消化法和酶灌流法等[5]。
因此,本试验采用简便、经济、无需特殊设备、仅需部分肝组织的离体酶消化法,比较不同酶消化分离猪原代肝细胞的效果,为一般实验室提取分离大量有活性的猪肝细胞提供参考。
1 材料与方法1.1 材料1.1.1 主要试剂新鲜猪肝组织,Hank's 平衡盐溶液(HBSS ),磷酸盐缓冲液(无菌PBS ),4%多聚甲醛(PFA ),收稿日期:2024-01-27基金项目:国家自然科学基金项目:复杂器官与组织在脾脏内的功能性再生(32230056)作者简介:周徐倩(1999-),女,汉族,浙江温州人,硕士在读,研究方向:组织工程与再生医学。
*通信作者简介:董磊(1978-),男,汉族,安徽阜阳人,博士,教授,研究方向:组织工程与再生医学、生物材料。
周徐倩,董磊.不同酶消化法提取猪原代肝细胞的效果比较[J].现代畜牧科技,2024,107(4):53-55. doi :10.19369/ki.2095-9737.2024.04.014. ZHOU Xuqian ,DONG Lei .Comparison of the Effect of Different Enzyme Digestion Methods on Extraction of Porcine Primary Hepatocytes[J].Modern Animal Husbandry Science & Technology ,2024,107(4):53-55.不同酶消化法提取猪原代肝细胞的效果比较周徐倩,董磊*(南京大学,江苏 南京 210023)摘要:猪肝细胞是猪圆环病毒的靶细胞,简单快速地提取猪原代肝细胞对于研究猪圆环病毒病的致病机制具有重要意义。
HPLC-MS
分析检测HPLC-MS/MS测定食糖中4种合成着色剂陈 艳,张 丽,冉艳瑞,黄 立,万 静,马艳红(昆明市食品药品检验所,云南昆明 650000)摘 要:目的:建立高效液相色谱-串联质谱法(High Performance Liquid Chromatography-Tandem Mass Spectrometry,HPLC-MS/MS)测定食糖中4种着色剂的分析方法。
方法:样品经80%甲醇超声提取,再用PWA-2固相萃取柱净化后,经VP-ODS C18柱(2.0 mm×150 mm,5.0 μm)分离,以乙酸铵和甲醇为流动相,梯度洗脱,用HPLC-MS/MS检测。
结果:4种化合物在考察范围内线性良好,相关系数均大于0.999;加标回收率在85.36%~102.30%,RSD为0.42%~2.72%;检出限为2~5 μg·kg-1。
结论:该方法灵敏度高、分辨率高、分析速度快,适用于食糖中合成着色剂的快速筛查和定量分析。
关键词:食糖;高效液相色谱-串联质谱法;合成着色剂;快速测定Determination of 4 Synthetic Colorants in Sugar by HPLC-MS/MS CHEN Yan, ZHANG Li, RAN Yanrui, HUANG Li, WAN Jing, MA Yanhong(Kunming Food and Drug Inspection Institute, Kunming 650000, China) Abstract: Objective: To establish an analytical method for the determination of four colorants in sugar using high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Method: The sample was ultrasonically extracted with 80% methanol, purified with a PWA-2 solid phase extraction column, and then separated on a VP-ODS C18 column (2.0 mm×150 mm, 5.0 μm) with a gradient elution using ammonium acetate and methanol as the mobile phases, and detected by HPLC-MS/MS. Result: The four compounds had good linearity within the investigation range, and the correlation coefficients were all greater than 0.999; the standard recovery rate was 85.36%~102.30%, and the RSD was 0.42%~2.72%; the detection limit was 2~5 μg·kg-1. Conclusion: This method has the characteristics of high sensitivity, resolution and fast analysis speed, and is suitable for rapid screening and quantitative analysis of synthetic colorants in sugar.Keywords: sugar; high performance liquid chromatography-tandem mass spectrometry; synthetic colorant; rapid determination.食糖作为人们日常生活中的必需品,其安全问题备受关注。
重组贻贝粘蛋白的表征及功效评价
生物技术进展 2023 年 第 13 卷 第 4 期 596 ~ 603Current Biotechnology ISSN 2095‑2341研究论文Articles重组贻贝粘蛋白的表征及功效评价李敏 , 魏文培 , 乔莎 , 郝东 , 周浩 , 赵硕文 , 张立峰 , 侯增淼 *西安德诺海思医疗科技有限公司,西安 710000摘要:为了推进重组贻贝粘蛋白在医疗、化妆品领域的应用,对大肠杆菌规模化发酵及纯化生产获得的重组贻贝粘蛋白进行了表征及功效评价。
经Edman 降解法、基质辅助激光解吸电离飞行时间质谱、PITC 法、非还原型SDS -聚丙烯酰胺凝胶电泳法、凝胶法、改良的Arnow 法对重组贻贝粘蛋白进行氨基酸N 端测序、相对分子量分析、氨基酸组成分析、蛋白纯度分析、内毒素含量测定、多巴含量测定;通过细胞迁移、斑马鱼尾鳍修复效果对重组贻贝粘蛋白进行功效评价。
结果显示,获得的重组贻贝粘蛋白与理论的一级结构一致,蛋白纯度达95%以上,内毒素<10 EU ·mg -1,多巴含量大于5%;重组贻贝粘蛋白浓度为60 μg ·mL -1时能够显著促进细胞增殖的活性(P <0.01);斑马鱼尾鳍面积样品组与模型对照组相比极显著增加(P <0.001)。
研究结果表明,重组贻贝粘蛋白具有显著的促细胞迁移和修复愈合的功效,具备作为生物医学材料的潜质。
关键词:贻贝粘蛋白;基因重组;生物材料;表征;功效评价DOI :10.19586/j.20952341.2023.0021 中图分类号:S985.3+1 文献标志码:ACharacterization and Efficacy Evaluation of Recombinant Mussel Adhesive ProteinLI Min , WEI Wenpei , QIAO Sha , HAO Dong , ZHOU Hao , ZHAO Shuowen , ZHANG Lifeng ,HOU Zengmiao *Xi'an DeNovo Hith Medical Technology Co., Ltd , Xi'an 710000, ChinaAbstract :In order to promote the application of recombinant mussel adhesive protein in the medical and cosmetics field , the recombi⁃nant mussel adhesive protein obtained from scale fermentation and purification of Escherichia coli was characterized and its efficacy was evaluated. Amino acid N -terminal sequencing , relative molecular weight analysis , amino acid composition analysis , protein purityanalysis , endotoxin content , dihydroxyphenylalanine (DOPA ) content of recombinant mussel adhesive protein were determined by the following methods : Edman degradation , matrix -assisted laser desorption ionization time -of -flight mass spectrometry (MALDI -TOF -MS ), phenyl -isothiocyanate (PITC ), nonreductive SDS -polyacrylamide gel electrophoresis (SDS -PAGE ), gel method , modified Ar⁃now. The efficacy of recombinant mussel adhesive protein was evaluated by cell migration and repairing effect of zebrafish tail fin. Re⁃sults showed that the obtained recombinant mussel adhesive protein was confirmed to be consistent with the theoretical primary structure , protein purity of more than 95%, endotoxin <10 EU ·mg -1, DOPA content above 5%. When the recombinant mussel adhesive protein concentration was 60 μg ·mL -1, the effect of promoting cell proliferation was the most obvious , and it had very significant activity (P <0.01). The caudal fin area of zebrafish in sample group was significantly increased compared with model control group (P <0.001). The results indicated that recombinant mussel adhesive protein can promote cell migration and repair healing and has the potential to be used as biomedical materials.Key words :mussel adhesive protein ; gene recombination ; biological materials ; representation ; efficacy evaluation贻贝粘蛋白(mussel adhesive protein , MAP )也称作贻贝足丝蛋白(mussel foot protein ,Mfps ),收稿日期:2023⁃02⁃24; 接受日期:2023⁃03⁃31联系方式:李敏 E -mail:*******************;*通信作者 侯增淼 E -mail:***********************.cn李敏,等:重组贻贝粘蛋白的表征及功效评价是海洋贝类——紫贻贝(Mytilus galloprovincalis)、厚壳贻贝(Mytilus coruscus)、翡翠贻贝(Perna viri⁃dis)等分泌的一种特殊的蛋白质,贻贝中含有多种贻贝粘蛋白,包括贻贝粘蛋白(Mfp 1~6)、前胶原蛋白(precollagens)和基质蛋白(matrix proteins)等[1]。
欧盟对草莓中的农残限量要求
0,02*
0,02*
0,02* 0,05*
Cypermethrin (cypermethrin including other mixtures of constituent isomers (sum of isomers)) (F) Cyproconazole (F) Cyprodinil (F) (R) Cyromazine Dalapon Daminozide (sum of daminozide and 1,1-dimethyl-hydrazine, expressed as daminozide) Dazomet (Methylisothiocyanate resulting from the use of dazomet and metam) DDT (sum of p,p´-DDT, o,p´-DDT, p-p´-DDE and p,p´-TDE (DDD) expressed as DDT) (F) Deltamethrin (cis-deltamethrin) (F) Desmedipham Diallate Diazinon (F) Dicamba Dichlobenil Dichlorprop: sum of dichlorprop (including dichlorprop-P) and its conjugates, expressed as dichlorprop Dichlorvos
1 0,01* 0,05* 0,01* 0,02 0,01* 0,01* 0,02* 0,1* 0,05* 0,02* 0,05
5 0,05* 0,05* 0,05* 0,2 0,5 0,05* 0,01* 0,01* 0,05* 0,01* 0,05*
0,5
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4-叔丁氧基苯乙烯-苯乙烯共聚物的合成
研究与开发CHINA SYNTHETIC RESIN AND PLASTICS合 成 树 脂 及 塑 料 , 2023, 40(6): 7芯片制造业是关系到我国国民经济发展的重要支柱产业。
芯片的制造包括光刻、刻蚀、封装等工序,光刻是整个集成电路制造中最关键且难度最大的一环,光刻工艺的发展水平直接决定集成电路的集成程度[1]。
光刻胶是基底上具有抗刻蚀性的光敏保护膜[2],也是光刻胶体系的支撑部分,主要由成膜树脂、感光剂、溶剂、助剂等组成[3]。
光刻胶由早期的g-线、i-线,发展成为目前以聚对羟基苯乙烯(PHS)衍生物为成膜树脂、曝光波长为248 nm及以聚甲基丙烯酸酯类为主、曝光波长为193 nm的光刻胶体系[4-7]。
其中,PHS作为248 nm光刻胶成膜树脂,在248 nm波长下透光性好,且化学结构中存在大量苯环,使其具备优异4-叔丁氧基苯乙烯-苯乙烯共聚物的合成吕 航,赵忠夫,王茧桦,韩春影,张春庆*(大连理工大学 化工学院,辽宁 大连 116024)摘要:采用活性阴离子聚合方法,以四氢呋喃(THF)/环己烷(CYX)为溶剂、正丁基锂为引发剂,苯乙烯与4-叔丁氧基苯乙烯为单体合成4-叔丁氧基苯乙烯-苯乙烯共聚物,并表征了其结构与性能。
结果表明:-78 ℃,THF为溶剂时,4-叔丁氧基苯乙烯-苯乙烯共聚物相对分子质量分布指数(PDI)为1.23,共聚过程中4-叔丁氧基苯乙烯活性高于苯乙烯;m(THF)∶m(CYX)=5∶5的THF/CYX为溶剂,-30 ℃下所得4-叔丁氧基苯乙烯-苯乙烯共聚物的PDI为1.10,相对分子质量分布更窄且有利于降低聚合成本;4-叔丁氧基苯乙烯-苯乙烯共聚物的玻璃化转变温度(t g)均低于4-叔丁氧基苯乙烯均聚物,4-叔丁氧基苯乙烯含量越高,4-叔丁氧基苯乙烯-苯乙烯共聚物的t g越高。
关键词:阴离子聚合 苯乙烯 4-叔丁氧基苯乙烯 二元共聚合中图分类号:TQ 334.3文献标志码: B 文章编号:1002-1396(2023)06-0007-05Synthesis of 4-tert-butoxystyrene-styrene copolymerLü Hang,Zhao Zhongfu,Wang Jianhua,Han Chunying,Zhang Chunqing(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)Abstract:The 4-tert-butoxystyrene-styrene copolymer was prepared via living anionic polymerization with tetrahydrofuran(THF)/cyclohexane(CYX) as solvent,n-BuLi as initiator,styrene and 4-tert-butoxystyrene as monomers,whose structure and performance were characterized. The results show that the molecular mass distribution index (PDI) of 4-tert-butoxystyrene-styrene copolymer obtained at -78 ℃ and THF as solvent is 1.23. The activity of 4-tert-butoxystyrene is higher than that of styrene during the copolymerization process. The PDI of the 4-tert-butoxystyrene-styrene copolymer is 1.10 at -30 ℃ when the mass ratio of THF and CYX is 5∶5. The molecular mass distribution of copolymer is narrower and polymerization costs is reduced. The glass transition temperature(t g) of the 4-tert-butoxystyrene-styrene copolymer is lower than that of the 4-tert-butoxystyrene homopolymer. The higher the 4-tert-butoxystyrene content is,the higher the t g of the 4-tert-butoxystyrene-styrene copolymer is.Keywords:anionic polymerization; styrene;4-tert-butoxystyrene; binary copolymerization收稿日期:2023-05-27;修回日期:2023-08-26。
UPLC-MS
UPLC-MS/MS测定茶叶中草甘膦、草铵膦及氨甲基膦酸残留量文洋洋(六安市产品质量监督检验所,安徽六安 237000)摘 要:目的:建立一种采用超高效液相色谱-串联质谱法(Ultra Performance Liquid Chromatography tandem Mass Spectrometry,UPLC-MS/MS)测定茶叶中草甘膦、草铵膦及氨甲基膦酸残留量的方法。
方法:通过对提取净化方式、衍生条件、UPLC-MS/MS色谱系统等进行分析和优化,使用CNWBOND HC-C18 SPE小柱进行前处理,采用芴甲氧羰酰氯丙酮溶液作为衍生化试剂,色谱系统选用ACQUITY UPLC® BEH C18色谱柱,并使用Waters I-Class/Xevo-TQD质谱联用仪进行分析。
结果:在10~500 ng·mL-1,草甘膦、草铵膦及氨甲基膦酸线性关系良好(R2>0.995);方法测定低限为50 μg·kg-1;不同加标浓度下,不同茶叶中草甘膦的回收率为80.8%~94.3%,草铵膦的回收率为82.0%~95.1%,氨甲基膦酸的回收率为83.1%~95.5%。
结论:该方法准确可靠,满足国标规定的最大残留量,为茶叶中草甘膦、草铵膦、氨甲基膦酸的检测提供了有效手段。
关键词:超高效液相色谱-串联质谱法;茶叶;草甘膦;草铵膦Determination of Glyphosate, Glufosinate and AMPA Residuesin Tea by UPLC-MS/MSWEN Yangyang(Lu’an Institute of Product Quality Supervision and Inspection, Lu’an 237000, China) Abstract: Objective: A method for the determination of glyphosate, glufosinate and aminonenenebc methylphosphonic acid residues in tea by ultra performance liquid chromatography tandem mass spectrometry(UPLC-MS/ MS) was established. Method: Through the analysis and optimization of extraction and purification methods, derivatization conditions, UPLC-MS/MS chromatographic system, CNWBOND HC-C18 SPE cartridge was used for pretreatment, Fmoc-Cl acetone solution was used as derivatization reagent, ACQUITY UPLC®BEH C18 column was used for chromatographic separation, and Waters I-Class/Xevo-TQD ultra-high performance liquid chromatography tandem mass spectrometer was used for analysis. Result: In the range of 10~500 ng·mL-1, the linear relationship among glyphosate, glufosinate and aminomethyl phosphonic acid was good (R2>0.995); the detection limit of the method was 50 μg·kg-1; the recoveries of glyphosate, glufosinate and ammonia methylphosphonic acid in different teas at different spiking concentrations were 80.8%~94.3%, 82.0%~95.1% and 83.1%~95.5% respectively. Conclusion: The quality of this method is reliable and accurate, which meets the maximum residue amount stipulated by the national standard, and provides an effective means for the detection of glyphosate, glufosinate-ammonium and aminomethyl phosphonic acid in tea.Keywords: ultra performance liquid chromatography tandem mass spectrometry; tea leaves; glyphosate; glufosinate草甘膦(Glyphosate,PMG)是近些年应用最广、产量最大的非选择性广谱除草剂,因其高效、廉价、低毒的特性被广泛应用于花木、茶叶、果树等领域[1]。
TW 46化学化工
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四硫代钼酸铵微观形貌
四硫代钼酸铵微观形貌
四硫代钼酸铵,是一种具有光电性的化合物,具有较高的催化性能和光吸收能力,在领域中具有广泛的应用。
而对于其微观形貌的研究,可以为其性能的进一步优化提供重要的理论基础和实验依据。
一、前言
四硫代钼酸铵是一种具有重要应用价值的光电材料。
目前,对于其微观形貌的研究已经成为了众多学者关注的焦点。
二、四硫代钼酸铵的合成
首先,需要进行四硫代钼酸铵的合成。
具体步骤如下:
1.将硫代硫酸铵和鲍尔试剂混合,进行孵育反应。
2.将反应液经过重结晶,得到蓝色的四硫代钼酸铵粉末。
三、四硫代钼酸铵的微观形貌观察
1.原子力显微镜(AFM)观察
使用原子力显微镜观察四硫代钼酸铵的微观形貌。
可以发现,其表面微观形貌呈现出较为均匀的颗粒形态,大小在0.1~1 μm之间。
同时,表面存在着较为明显的晶体面。
2.透射电镜(TEM)观察
通过透射电镜观察,可以发现四硫代钼酸铵的微观形貌为多面体颗粒状。
其中,大部分颗粒的直径在50~100 nm之间。
颗粒表面存在着较为明显的晶体面,呈现出较为规则的形态。
四、结论
通过以上的研究,可以看出四硫代钼酸铵的微观形貌具有一定的规则性。
底层的晶体结构明显,同时表面形态较为均匀,颗粒大小较小,且分布较为均匀。
这些特性都为其性能的进一步优化提供了理论基础和实验依据。
五、结语
总之,四硫代钼酸铵的微观形貌研究对于优化其性能具有十分重
要的意义。
希望在未来的研究中,能够有更多的学者关注并深入研究这个领域,为其在各个应用领域的发展提供更加坚实的基础。