CN101021506A - 芯片毛细管电泳中低速电渗流的测量方法 - Google Patents
芯片毛细管电泳中低速电渗流的测量方法 Download PDFInfo
- Publication number
- CN101021506A CN101021506A CN200710021018.XA CN200710021018A CN101021506A CN 101021506 A CN101021506 A CN 101021506A CN 200710021018 A CN200710021018 A CN 200710021018A CN 101021506 A CN101021506 A CN 101021506A
- Authority
- CN
- China
- Prior art keywords
- electroosmotic flow
- probe
- microchip
- mobility
- chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001962 electrophoresis Methods 0.000 title claims description 10
- 238000005370 electroosmosis Methods 0.000 claims abstract description 43
- 239000000523 sample Substances 0.000 claims abstract description 33
- 239000000126 substance Substances 0.000 claims abstract description 16
- 239000003792 electrolyte Substances 0.000 abstract description 8
- 238000005251 capillar electrophoresis Methods 0.000 abstract description 6
- 239000008151 electrolyte solution Substances 0.000 abstract description 2
- 239000007853 buffer solution Substances 0.000 abstract 1
- 229940088597 hormone Drugs 0.000 abstract 1
- 239000005556 hormone Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- GLDQAMYCGOIJDV-UHFFFAOYSA-N 2,3-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC=CC(O)=C1O GLDQAMYCGOIJDV-UHFFFAOYSA-N 0.000 description 2
- YFMPSMITLLBENU-UHFFFAOYSA-N 3,4-dihydroxybenzylamine Chemical compound NCC1=CC=C(O)C(O)=C1 YFMPSMITLLBENU-UHFFFAOYSA-N 0.000 description 2
- 101100148256 Actinobacillus pleuropneumoniae apxIB gene Proteins 0.000 description 2
- 101100148259 Actinobacillus pleuropneumoniae apxIIA gene Proteins 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910021607 Silver chloride Inorganic materials 0.000 description 2
- 101150050411 appA gene Proteins 0.000 description 2
- 101150008617 appB gene Proteins 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000008363 phosphate buffer Substances 0.000 description 2
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Images
Landscapes
- Investigating Or Analysing Biological Materials (AREA)
Abstract
一种芯片毛细管电泳中低速电渗流的测量方法,首先在一个作为参比的快速电渗流微芯片A上以样品区带法完成探针物质的有效淌度的测定,方法简述如下,在背景电解质中加入一个快速迁移的且可被测定的物质(探针),当不同于背景电解质溶液浓度的类背景电解质溶液作为样品进样后,得到电泳图,利用图中的出峰时间可以计算出探针物质在参比芯片上的有效淌度(μeff),然后,利用相同的不含探针的背景电解质溶液作为缓冲液,以探针物质作为样品在未知电渗流的微芯片B上完成常规的毛细管电泳检测,可以计算得到探针在微芯片B上的表观淌度(μnpp),根据以下公式可以计算出求知的电渗流淌度(μEOF),μEOF=μnpp-μeff。
Description
技术领域
本发明涉及低速电渗流的测量。具体地说,是基于一个电迁移的物质在微芯片管道中的有效淌度不变的原理来间接测量低速电渗流。
背景技术
微流控芯片电泳技术自二十世纪九十年代开始迅速发展起来[参见:Manz,A.,Graber,N.,Widmer,H.M.,Sens.Actuators B 1990,B1(1-6),244-248.],为了满足各个方面的应用,常对微管道进行化学或物理修饰,减小溶质与管壁的相互作用并且抑制电渗流。因此对微管道的电渗流性质表征就显得非常重要。
常用的电渗流测定方法有中性标记物法[参见:Jorgenson,J.W.,Lukacs,K.D.,Anal.Chem.1981,53,1298-1302.]和电流监测法[参见:Huang,X.,Gordon,M.J.,Zare,R.N.,Anal.Chem.1988,60,1837-1838.]。最为常用的是中性标记物法,就是利用一种中性化合物在电场中的作用下迁移来测定电渗流;电流监测法也是一种应用率很高的方法,在管道中通过电渗驱动的作用将一略为稀释的相同电解质溶液(与毛细管中的溶液相比)替代毛细管中的溶液,通过监测电路中电流随时间变化的曲线图,根据管道中高浓度溶液全部被替代时的时间来计算电渗流。
当需要测定低电渗流或者零电渗流时,就出现了困难,在用中性标记物法和电流监测法中,在经过很长的迁移时间后,信号会变得不明显或者没有信号。到目前为止,还没有关于微芯片毛细管电泳中低电渗流或者零电渗流测定方法的报道。
发明内容
本发明的目的是提供一种测量低电渗流的方法。
本发明的技术方案如下:
一种芯片毛细管电泳中低速电渗流的测量方法,它是首先在一作为参比的快速电渗流微芯片A上以样品区带法[参见:Wang,W.,Zhao,L.,Jiang,L.P.,Zhang,J.R.,Zhu,J.J.,Chen,H.Y.,Electrophoresis 2006,27,5132-5137.]完成探针物质的有效淌度的测定,简述如下,在背景电解质中加入一个快速迁移的且可被测定的物质(探针),当不同于背景电解质溶液浓度的类背景电解质溶液作为样品进样后,得到了电泳图,利用图中的出峰时间可以计算出探针物质在参比芯片上的有效淌度(μeff),然后,利用相同的不含探针的背景电解质溶液作为缓冲液,以探针物质作为样品在未知电渗流的微芯片B上完成常规的毛细管电泳检测,可以计算得到探针在微芯片B上的表观淌度(μapp),根据以下公式可以计算出求知的电渗流淌度(μEOF),μEOF=μapp-μeff。
一个特定的探针物质在确定的缓冲液中的有效淌度是恒定不变的,也就是探针物质在参比芯片和待测电渗流芯片上的有效淌度是相等的,
因此,μeffA1=μeffB1
其中μeffA1和μeffB1分别为微芯片A和微芯片B中的有效迁移率。该探针物质的有效迁移率可以从其表观迁移率和电渗流来计算,
以上公式中μappA1,μEOFA和VA分别为微芯片A中的探针物质的表观迁移率、电渗流淌度和分离电压,tA1和tA2分别为微芯片A中探针物质和电渗流的出峰时间。μappB1,μEOFB和VB分别代表微芯片B中的相应量。LA,LAeff,LB和LBeff分别为微芯片A和微芯片B的长度和有效长度。因此,μEOFB可以用下式表示,
如果LA=LB=L,LAeff=LBeff=Leff并且VA=VB=V,μEOFB可以按下式计算而得。
四、附图说明
图1为本发明中测量电渗流时所应用的微芯片示意图,其中:A为缓冲液池,B为分离管道出口,C为缓冲液池,D为样品废液池,E为进样管道和分离管道交叉口,F为缓冲液废液池,WE为电化学工作电极。。
图2为本发明在参比芯片A上用间接方法测得的电泳示意图,tA1和tA2分别为微芯片A中探针物质和电渗流的出峰时间。
图3为本发明在待测电渗流芯片B上用直接方法测得的电泳示意图,tB1和tB2分别为微芯片B中探针物质和电渗流的迁移时间。其中:虚线峰是假想的电渗流的信号峰。
具体实施方式
实施例1.Brij 56修饰过的聚二甲基硅氧硅(PDMS)微芯片的电渗流的测量
测量Brij 56修饰过的PDMS微芯片管道中充满磷酸盐缓冲液(20mM PBS pH7.00)时的电渗流,以0.1mM 3,4-二羟基苄胺(DHBA)作为探针物质,20mM PBS作为背景电解质,以未作修饰的PDMS微芯片作为参比芯片A,其中:AE=0.3cm;EB=3.6cm;CE=ED=0.5cm。在毛细管电泳过程中,分离电压设定为800V,检测电位+1.2V(vs.Ag/AgCl电极),根据测量所得的迁移时间,tB1=59.2s,tA1=41.2s,tA1=65.0s,计算得到电渗流的大小为(1.40±0.04)×10-4cm2/(Vs)。与文献推测值相一致[参见:Dou,Y.H.,Bao,N.,Xu,J.J.,Meng,F.,Chen,H.Y.,Electrophoresis 2004,25,3024-3031.]。
实施例2.聚乙烯醇(PVA)修饰过的PDMS微芯片管道的电渗流的测量
测量PVA修饰过的PDMS微芯片管道中充满磷酸盐缓冲液(20mM PBS pH7.00)时的电渗流,以0.1mM 3,4-二羟基苄胺(DHBA)作为探针物质,20mM PBS作为背景电解质,以未作修饰的PDMS微芯片作为参比芯片A,其中:AE=0.3cm;EB=3.6cm;CE=ED=0.5cm。在毛细管电泳过程中,分离电压设定为800V,检测电位+1.2V(vs.Ag/AgCl电极),根据测量所得的迁移时间,tB1=98.7s,tA1=41.2s,tA1=65.0s,计算得到电渗流的大小为(0.22±0.02)×10-4cm2/(Vs)。与文献推测值相一致[参见:Wu,D.,Luo,Y.,Zhou,X.,Dai,Z.,Lin,B.,Electrophoresis 2005,26,211-218.]。
Claims (2)
1.一种芯片毛细管电泳中低速电渗流的测量方法,其特征是:首先在一个作为参比的快速电渗流微芯片A上测得探针物质的有效淌度μeff,然后测得探针物质在待测电渗流的微芯片B上的表观淌度μapp,根据以下公式计算出未知的电渗流淌度μEOF,
μEOF=μapp-μeff 。
2.根据权利要求1所述的快速测定微流控芯片低电渗流的方法,其特征是:以样品区带法在快速电渗流参比芯片上一次性完成探针物质和电渗流的迁移时间测量,直接计算出有效淌度。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB200710021018XA CN100473986C (zh) | 2007-03-22 | 2007-03-22 | 芯片毛细管电泳中低速电渗流的测量方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB200710021018XA CN100473986C (zh) | 2007-03-22 | 2007-03-22 | 芯片毛细管电泳中低速电渗流的测量方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN101021506A true CN101021506A (zh) | 2007-08-22 |
CN100473986C CN100473986C (zh) | 2009-04-01 |
Family
ID=38709340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CNB200710021018XA Expired - Fee Related CN100473986C (zh) | 2007-03-22 | 2007-03-22 | 芯片毛细管电泳中低速电渗流的测量方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN100473986C (zh) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104122316A (zh) * | 2014-06-30 | 2014-10-29 | 中国科学院化学研究所 | 利用分布式直流电场同时测定颗粒物的淌度和介电淌度的方法 |
CN108007994A (zh) * | 2017-06-27 | 2018-05-08 | 北京理工大学 | 一种测定毛细管电泳电渗流的方法 |
CN114660283A (zh) * | 2022-05-24 | 2022-06-24 | 佛山微奥云生物技术有限公司 | 一种基于电学加速的免疫检测板式芯片及其制备方法 |
-
2007
- 2007-03-22 CN CNB200710021018XA patent/CN100473986C/zh not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104122316A (zh) * | 2014-06-30 | 2014-10-29 | 中国科学院化学研究所 | 利用分布式直流电场同时测定颗粒物的淌度和介电淌度的方法 |
CN108007994A (zh) * | 2017-06-27 | 2018-05-08 | 北京理工大学 | 一种测定毛细管电泳电渗流的方法 |
CN108007994B (zh) * | 2017-06-27 | 2019-12-03 | 北京理工大学 | 一种测定毛细管电泳电渗流的方法 |
CN114660283A (zh) * | 2022-05-24 | 2022-06-24 | 佛山微奥云生物技术有限公司 | 一种基于电学加速的免疫检测板式芯片及其制备方法 |
CN114660283B (zh) * | 2022-05-24 | 2022-09-13 | 佛山微奥云生物技术有限公司 | 一种基于电学加速的免疫检测板式芯片及其制备方法 |
Also Published As
Publication number | Publication date |
---|---|
CN100473986C (zh) | 2009-04-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Manz et al. | Electroosmotic pumping and electrophoretic separations for miniaturized chemical analysis systems | |
Wang et al. | Measurement of electroosmotic flow in capillary and microchip electrophoresis | |
US8080144B2 (en) | Gradient elution electrophoresis | |
CA2021198A1 (en) | System for measuring electrokinetic properties and for characterizing electrokinetic separations by monitoring current in electrophoresis | |
Tomazelli Coltro et al. | Electrophoresis microchip fabricated by a direct‐printing process with end‐channel amperometric detection | |
RU2002121247A (ru) | Электрохимический способ анализа коагуляции и устройство для его осуществления | |
US20080237044A1 (en) | Method and apparatus for concentrating molecules | |
Prest et al. | Single electrode conductivity detection for electrophoretic separation systems | |
CN100473986C (zh) | 芯片毛细管电泳中低速电渗流的测量方法 | |
LIANG et al. | Research and application progress of paper-based microfluidic sample preconcentration | |
US8366897B2 (en) | Gradient elution electrophoresis and detectorless electrophoresis apparatus | |
Chen et al. | Drop-by-drop chemical reaction and sample introduction for capillary electrophoresis | |
Müller et al. | A conductometric detector for capillary separations | |
Chen et al. | Fabrication and performance of a three‐dimensionally adjustable device for the amperometric detection of microchip capillary electrophoresis | |
JP2008134199A (ja) | 微小流体デバイス電気泳動方法および装置 | |
Chen et al. | Determination of EOF of PMMA microfluidic chip by indirect laser-induced fluorescence detection | |
US20120193234A1 (en) | Capillary electrophoresis chips | |
Yu et al. | Improved separation efficiency of neurotransmitters on a native printed capillary electrophoresis microchip simply by manipulating electroosmotic flow | |
Feng et al. | On‐chip potential gradient detection with a portable capillary electrophoresis system | |
Liu et al. | Studying drug–plasma protein interactions by two‐injector microchip electrophoresis frontal analysis | |
Quirino | Electrokinetic removal of charged species from small sample volumes | |
Álvarez-Martos et al. | Ionic liquids as modifiers for glass and SU-8 electrochemical microfluidic chips | |
Yao et al. | A three-dimensionally adjustable amperometric detector for microchip electrophoretic measurement of nitroaromatic pollutants | |
Rana et al. | Electrophoresis: Basic principle, types, and applications | |
Wang et al. | Low EOF rate measurement based on constant effective mobility in microchip CE |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C17 | Cessation of patent right | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090401 Termination date: 20100322 |