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分离纯化方法 2 ----- 电泳技术(上). Electrophoresis. Electrophoresis 第一节 电泳概述 第二节 核酸电泳 第三节 蛋白质电泳. 第一节 电泳概述. 电泳是指荷电的胶体颗粒在电场中的移动。 —— Arne Tiselius(1959), Electrophoresis Theory, Methods and Applications . 一、 电泳的发展 二、 电泳的定义及常用术语 三、 电泳技术的基本原理 四、 电泳技术的种类 五、 电泳的支持介质 六、 电泳系统. 一、电泳技术的发展. - PowerPoint PPT Presentation
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2-----
Electrophoresis
Electrophoresis
Arne Tiselius(1959), Electrophoresis Theory, Methods and Applications.
1809Ress1937Tiselius Tiselius A121948
1940 60 1967Shapiro SDS 1969WeberSDS- 1970LaemmliSDS
701975OFarrell ISO-DALT1985Gorg IPG-DALT
90
1(electrophoresisEP)
2(electrophoretic migration)EMcm 3(migration time)tmin 4(electrophoretic velocity)V cm /min5(electric field strength)E V/cmE = V /LVL
AB6(electroosmosis)
7(relative mobility)mR
(cm)mR = (cm)
pH +-
Q F=E Q 1,F F=6rV F=F EQ= 6rV
,(V)(E)(Q),(r)()DNA234
4 m m = V/E = Q/6r 5
4 m
pHUm U = m 6 65 U = 7
.Q.6r 7QpH
U
r; E q 1
2E (1)E=2-10v/cm (2) E=70200Vcm
3pHpH0.02O.2
4
5Q=I2RT
6
123
12(1)(2)(3)
:(1). (2)(molecular sieving effect)3
1(1)(600V)SDS-(2)(3000V)DNA(3)(30000-50000V)
21Tiselius
2(disc electrophoresis)
3(slab electrophoresis)
3
1 D-36L- 10045
2
3DNADNA
DNA200bpDNA; 5500bp; 1bpDNADNA
1 DNA()DNA20kb1DNA
2 DNA
DNA DNA>DNA>DNADNA()O(Rm=O)DNA()(Rm>O)3
456
TAE 50TBE 5 TPE 10 2()3
TAEDNATAE1013 kb DNATAEDNATAETAETrisEDTA
TBETrisEDTATBE1 kbDNA
DNATPETrisEDTA
6O.25-0.25%FF-40%4O.25-0.25%FF-15%m/V)400O.25-0.25%FF-30% 4 TBE4
5(ethidium bromideEB)EB(Ag+)Ag+EB200.DNA
X-ray structure of a complex of ethidium with 5-iodo-UpA
612DNA
712345
1.
4M1M 0M
0.1 0.25 0.5 1.0 5.0 DNA Hind III fragments (g)Effect of sample DNA concentration on resolution.
12
12PAGE3SDS-PAGE4pH 56DNA7
60DavisSDS-
1 ()(1)(100500 V) 210 Vcm(2)(200010000 V) 50200Vcm 2pH pHpHpH(pI) 3 O.02O.2(ionic strength) I= 1/2 CZ2 Ic(molL)z O.15 mo/L Na2SO4 I=1/20.15212+0.1522=0.45
2pH pHpHpH(pI)
OH- pH
5 6
123
D-36L-10045
1%150nm (9899)
1(1)DNA DNA()DNA20kbDNADNADNA
(1) ()12 mmEDTA(pH8.0)Tris-(TAE)Tris-(TBE)Tris-(TPE)50 mmolL(pH7.57.8)TAETBE510O.5
TAE(Tris)TAETrisEDTATAE(TBE)DNA1013 kbTAEDNATAETAE()
TBE(Tris-)TrisEDTATBETBE1 kbTBEDNA
Effect of salt concentration on resolution of fragments.Samples in all three lanes are identical except for [salt].