Step-growth polymerization - Revision history

173.68.97.117 at 14:55, 3 January 2015

2015-01-03T14:55:07Z

← Older revision		Revision as of 16:55, 3 January 2015
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en>Dirac66: Undid revision 595915053 by 128.227.134.80 (talk) Delete UF CHM4272 (was this a course number??)

2014-02-17T19:49:54Z

Undid revision 595915053 by 128.227.134.80 (talk) Delete UF CHM4272 (was this a course number??)

← Older revision		Revision as of 21:49, 17 February 2014
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	~~{{Infobox chemical analysis~~		Ƭhe [http://Www.Twitpic.com/tag/author%27s author's] namе iѕ Mariano Hallinan. Ӏ аm a customer service representative. Ԝhat Ӏ adore dοing is taking part in dominoes bսt ӏ struggle to [http://www.discover.org/ discover] time for it. Mississippi іs ѡhere he's սsually been living Ƅut his wife wants thеm to transfer. Ιf yoս want to discover օut mսch moгe check օut my website: http://dev1.artworldwebsolutions.com/AsGso<br><br>
	~~\| name = Ion exchange chromatography~~
	~~\|\| caption = Metrohm 850 Professional Ion Chromatography System~~
	~~\| acronym = IC, IEC~~
	~~\| classification =~~[~~[Chromatography]]~~
	~~\| analytes =~~
	~~\| related = [[High performance liquid chromatography]]<br>[[Aqueous Normal Phase Chromatography]]<br>[[Size exclusion chromatography]]<br>[[Micellar liquid chromatography]]~~
	~~\| hyphenated =~~
	}}
	~~'''Ion-exchange chromatography''' (or ''ion chromatography~~'~~') is a process that allows the separation of [[ion]]~~s ~~and [[polar molecule~~]~~]s based on their affinity~~ to ~~the ion exchanger~~. ~~It can be used~~ for ~~almost any kind of charged molecule including large [[proteins]], small [[nucleotides]] and [[amino acid]]~~s. ~~The solution~~ to ~~be injected is usually called a ''sample'', and the individually separated components are called ''analytes''~~. ~~It is often used in protein purification, water analysis, and quality control~~.

	~~==Principle==~~		My web blog - [http://dev1.artworldwebsolutions.com/AsGso casinosidorna svensk support]
	~~[[Image:Ion chromatogram.JPG\|thumb\|450px\|right\|Ion Chromatography]]~~
	Ion-exchange chromatography retains [[analyte]] molecules on the column based on [[Coulomb's law\|coulombic]] (ionic) interactions. The stationary phase surface displays ionic functional groups (R-X) that interact with analyte ions of opposite charge. This type of chromatography is further subdivided into cation exchange chromatography and anion exchange chromatography. The ionic compound consisting of the cationic species M+ and the anionic species B- can be retained by the stationary phase.

	~~Cation exchange chromatography retains positively charged [[cation]]s because the stationary phase displays a negatively charged functional group:~~

	~~<math>\text{R-X}^-\text{C}^+\,+\, \text{M}^+ \, \text{B}^- \rightleftarrows \,\text{R-X}^-\text{M}^+ \,+\, \text{C}^+ \,+\, \text{B}^-</math>~~

	~~Anion exchange chromatography retains anions using positively charged functional group:~~

	~~<math>\text{R~~-~~X}^+\text{A}^-\,+\, \text{M}^+ \, \text{B}^- \rightleftarrows \,\text{R-X}^+\text{B}^- \,+\, \text{M}^+ \,+\, \text{A}^-</math>~~

	~~Note that the ion strength of either C+ or A- in the mobile phase can be adjusted to shift the equilibrium position and thus retention time.~~

	~~The ion chromatogram shows a typical chromatogram obtained with an anion exchange column.~~

	~~==Typical technique==~~
	~~[[Image:Metrohm 850.jpg\|thumb\|right\|300 px\|Metrohm 850 Ion chromatography system]]~~

	A sample is introduced, either manually or with an [[autosampler]], into a sample loop of known volume. A [[buffer solution\|buffered]] aqueous solution known as the mobile phase carries the sample from the loop onto a column that contains some form of stationary phase material. This is typically a resin or gel matrix consisting of [[agarose]] or [[cellulose]] beads with [[Covalent bond\|covalently]] bonded charged functional groups. The target analytes (anions or cations) are retained on the stationary phase but can be eluted by increasing the concentration of a similarly charged species that will displace the analyte ions from the stationary phase. For example, in cation exchange chromatography, the positively charged analyte could be displaced by the addition of positively charged sodium ions. The analytes of interest must then be detected by some means, typically by [[conductivity (electrolytic)\|conductivity]] or UV/Visible light absorbance.

	~~In order to control an IC system, a [[chromatography data system]] (CDS) is usually needed. In addition to IC systems, some of these CDSs can also control [[gas chromatography]] (GC) and HPLC~~

	~~== Separating proteins ==~~
	~~[[Image:Ion exchange column.jpg\|thumb\|left\|Preparative-scale ion exchange column used for [[protein purification]].]]~~

	Proteins have numerous functional groups that can have both positive and negative charges. Ion exchange chromatography separates proteins according to their net charge, which is dependent on the composition of the mobile phase. By adjusting the pH or the ionic concentration of the mobile phase, various protein molecules can be separated. For example, if a protein has a net positive charge at pH 7, then it will bind to a column of negatively charged beads, whereas a negatively charged protein would not. By changing the pH so that the net charge on the protein is negative, it too will be eluted.

	Elution by increasing the ionic strength of the mobile phase is a more subtle effect - it works as ions from the mobile phase will interact with the immobilized ions in preference over those on the stationary phase. This "shields" the stationary phase from the protein, (and vice versa) and allows the protein to elute.

	Separation can be achieved based on the natural [[isoelectric point]] of the protein. Alternatively a peptide tag can be genetically added to the protein to give the protein an isoelectic point away from most natural proteins (e.g. 6 arginines for binding to cation-exchange resin such as [[DEAE-Sepharose]] or 6 glutamates for binding to anion-exchange resin).

	Elution from ion-exchange columns can be sensitive to changes of a single charge- [[chromatofocusing]]. Ion-exchange chromatography is also useful in the isolation of specific multimeric protein assemblies, allowing purification of specific complexes according to both the number and the position of charged peptide tags.<ref>{{cite journal \|last1=Sakash \|first1=J.B. \|last2=Kantrowitz \|first2=E.R. \|title=The contribution of individual interchain interactions to the stabilization of the T and R states of Escherichia coli aspartate transcarbamoylase. \|journal=J Biol Chem \|volume=275 \|pages=28701 \|year=2000 \|pmid=10875936}}</ref><ref>{{cite journal \|last1=Fairhead \|first1=M. \|title=Plug-and-Play Pairing via Defined Divalent Streptavidins. \|journal=J Mol Biol \|year=2013 \|pmid=24056174}}</ref>

	~~== Clinical utility ==~~
	~~Used in measurement of [[HbA1c]], [[porphyrin]] & [[water purification]].~~

	~~==See also==~~
	*[[Isoelectric point]]
	*[[High performance liquid chromatography]]
	*[[Chromatofocusing]]

	~~==References==~~
	~~{{reflist}}~~
	~~{{More footnotes\|date=March 2010}}~~
	*{{cite book \|author=Small, Hamish \|title=Ion chromatography \|publisher=Plenum Press \|location=New York \|year=1989 \|pages= \|isbn=0-306-43290-0 \|oclc= \|doi= \|accessdate=}}
	*{{cite book \|author=Tatjana Weiss; Weiss, Joachim \|title=Handbook of Ion Chromatography \|publisher=Wiley-VCH \|location=Weinheim \|year=2005 \|pages= \|isbn=3-527-28701-9 \|oclc= \|doi= \|accessdate=}}
	*{{cite book \|author=Gjerde, Douglas T.; Fritz, James S. \|title=Ion Chromatography \|publisher=Wiley-VCH \|location=Weinheim \|year=2000 \|pages= \|isbn=3-527-29914-9 \|oclc= \|doi= \|accessdate=}}
	*{{cite book \|author=Jackson, Peter; Haddad, Paul R. \|title=Ion chromatography: principles and applications \|publisher=Elsevier \|location=Amsterdam \|year=1990 \|pages= \|isbn=0-444-88232-4 \|oclc= \|doi= \|accessdate=}}

	~~==External links==~~
	~~{{Library resources box~~
	~~\|onlinebooks=no~~
	~~\|by=no~~
	~~\|lcheading=Ion exchange chromatography~~
	~~\|label=Ion exchange chromatography}}~~
	*[http://~~www~~.~~gelifesciences~~.com/~~handbooks Ion Exchange Chromatography Handbook]~~


	*{{Dmoz\|/Science/Chemistry/Analytical/Separations_Science/Liquid_Chromatography/Products_and_Services/Instruments\|LC Instruments}}
	~~<!--========================({{No More Links}})============================~~
	~~\| PLEASE BE CAUTIOUS IN ADDING MORE LINKS TO THIS ARTICLE. WIKIPEDIA \|~~
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	~~\| to the relevant category at the Open Directory Project (dmoz.org) \|~~
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	~~{{chromatography}}~~

	~~[[Category:Chromatography]~~]

en>Dirac66: Rv last edit - restore formatting

2014-01-23T20:47:10Z

Rv last edit - restore formatting

← Older revision		Revision as of 22:47, 23 January 2014
Line 1:		Line 1:
	~~Hello!~~ <br>I'~~m Vietnamese male~~ :D. <br>~~I really love Leaf collecting and pressing!~~<br><br>~~Feel free~~ to ~~surf~~ to ~~my web site how~~ to ~~get free fifa 15 coins~~ ([http://www.~~ruthfennell~~.com/~~?q=content~~/~~fifa~~-~~coin~~-~~generator~~-~~1 Learn Alot more Here~~])		{{Infobox chemical analysis
			\| name = Ion exchange chromatography
			\|\| caption = Metrohm 850 Professional Ion Chromatography System
			\| acronym = IC, IEC
			\| classification =[[Chromatography]]
			\| analytes =
			\| related = [[High performance liquid chromatography]]<br>[[Aqueous Normal Phase Chromatography]]<br>[[Size exclusion chromatography]]<br>[[Micellar liquid chromatography]]
			\| hyphenated =
			}}
			'''Ion-exchange chromatography''' (or ''ion chromatography'') is a process that allows the separation of [[ion]]s and [[polar molecule]]s based on their affinity to the ion exchanger. It can be used for almost any kind of charged molecule including large [[proteins]], small [[nucleotides]] and [[amino acid]]s. The solution to be injected is usually called a ''sample'', and the individually separated components are called ''analytes''. It is often used in protein purification, water analysis, and quality control.

			==Principle==
			[[Image:Ion chromatogram.JPG\|thumb\|450px\|right\|Ion Chromatography]]
			Ion-exchange chromatography retains [[analyte]] molecules on the column based on [[Coulomb's law\|coulombic]] (ionic) interactions. The stationary phase surface displays ionic functional groups (R-X) that interact with analyte ions of opposite charge. This type of chromatography is further subdivided into cation exchange chromatography and anion exchange chromatography. The ionic compound consisting of the cationic species M+ and the anionic species B- can be retained by the stationary phase.

			Cation exchange chromatography retains positively charged [[cation]]s because the stationary phase displays a negatively charged functional group:

			<math>\text{R-X}^-\text{C}^+\,+\, \text{M}^+ \, \text{B}^- \rightleftarrows \,\text{R-X}^-\text{M}^+ \,+\, \text{C}^+ \,+\, \text{B}^-</math>

			Anion exchange chromatography retains anions using positively charged functional group:

			<math>\text{R-X}^+\text{A}^-\,+\, \text{M}^+ \, \text{B}^- \rightleftarrows \,\text{R-X}^+\text{B}^- \,+\, \text{M}^+ \,+\, \text{A}^-</math>

			Note that the ion strength of either C+ or A- in the mobile phase can be adjusted to shift the equilibrium position and thus retention time.

			The ion chromatogram shows a typical chromatogram obtained with an anion exchange column.

			==Typical technique==
			[[Image:Metrohm 850.jpg\|thumb\|right\|300 px\|Metrohm 850 Ion chromatography system]]

			A sample is introduced, either manually or with an [[autosampler]], into a sample loop of known volume. A [[buffer solution\|buffered]] aqueous solution known as the mobile phase carries the sample from the loop onto a column that contains some form of stationary phase material. This is typically a resin or gel matrix consisting of [[agarose]] or [[cellulose]] beads with [[Covalent bond\|covalently]] bonded charged functional groups. The target analytes (anions or cations) are retained on the stationary phase but can be eluted by increasing the concentration of a similarly charged species that will displace the analyte ions from the stationary phase. For example, in cation exchange chromatography, the positively charged analyte could be displaced by the addition of positively charged sodium ions. The analytes of interest must then be detected by some means, typically by [[conductivity (electrolytic)\|conductivity]] or UV/Visible light absorbance.

			In order to control an IC system, a [[chromatography data system]] (CDS) is usually needed. In addition to IC systems, some of these CDSs can also control [[gas chromatography]] (GC) and HPLC

			== Separating proteins ==
			[[Image:Ion exchange column.jpg\|thumb\|left\|Preparative-scale ion exchange column used for [[protein purification]].]]

			Proteins have numerous functional groups that can have both positive and negative charges. Ion exchange chromatography separates proteins according to their net charge, which is dependent on the composition of the mobile phase. By adjusting the pH or the ionic concentration of the mobile phase, various protein molecules can be separated. For example, if a protein has a net positive charge at pH 7, then it will bind to a column of negatively charged beads, whereas a negatively charged protein would not. By changing the pH so that the net charge on the protein is negative, it too will be eluted.

			Elution by increasing the ionic strength of the mobile phase is a more subtle effect - it works as ions from the mobile phase will interact with the immobilized ions in preference over those on the stationary phase. This "shields" the stationary phase from the protein, (and vice versa) and allows the protein to elute.

			Separation can be achieved based on the natural [[isoelectric point]] of the protein. Alternatively a peptide tag can be genetically added to the protein to give the protein an isoelectic point away from most natural proteins (e.g. 6 arginines for binding to cation-exchange resin such as [[DEAE-Sepharose]] or 6 glutamates for binding to anion-exchange resin).

			Elution from ion-exchange columns can be sensitive to changes of a single charge- [[chromatofocusing]]. Ion-exchange chromatography is also useful in the isolation of specific multimeric protein assemblies, allowing purification of specific complexes according to both the number and the position of charged peptide tags.<ref>{{cite journal \|last1=Sakash \|first1=J.B. \|last2=Kantrowitz \|first2=E.R. \|title=The contribution of individual interchain interactions to the stabilization of the T and R states of Escherichia coli aspartate transcarbamoylase. \|journal=J Biol Chem \|volume=275 \|pages=28701 \|year=2000 \|pmid=10875936}}</ref><ref>{{cite journal \|last1=Fairhead \|first1=M. \|title=Plug-and-Play Pairing via Defined Divalent Streptavidins. \|journal=J Mol Biol \|year=2013 \|pmid=24056174}}</ref>

			== Clinical utility ==
			Used in measurement of [[HbA1c]], [[porphyrin]] & [[water purification]].

			==See also==
			*[[Isoelectric point]]
			*[[High performance liquid chromatography]]
			*[[Chromatofocusing]]

			==References==
			{{reflist}}
			{{More footnotes\|date=March 2010}}
			*{{cite book \|author=Small, Hamish \|title=Ion chromatography \|publisher=Plenum Press \|location=New York \|year=1989 \|pages= \|isbn=0-306-43290-0 \|oclc= \|doi= \|accessdate=}}
			*{{cite book \|author=Tatjana Weiss; Weiss, Joachim \|title=Handbook of Ion Chromatography \|publisher=Wiley-VCH \|location=Weinheim \|year=2005 \|pages= \|isbn=3-527-28701-9 \|oclc= \|doi= \|accessdate=}}
			*{{cite book \|author=Gjerde, Douglas T.; Fritz, James S. \|title=Ion Chromatography \|publisher=Wiley-VCH \|location=Weinheim \|year=2000 \|pages= \|isbn=3-527-29914-9 \|oclc= \|doi= \|accessdate=}}
			*{{cite book \|author=Jackson, Peter; Haddad, Paul R. \|title=Ion chromatography: principles and applications \|publisher=Elsevier \|location=Amsterdam \|year=1990 \|pages= \|isbn=0-444-88232-4 \|oclc= \|doi= \|accessdate=}}

			==External links==
			{{Library resources box
			\|onlinebooks=no
			\|by=no
			\|lcheading=Ion exchange chromatography
			\|label=Ion exchange chromatography}}
			*[http://www.gelifesciences.com/handbooks Ion Exchange Chromatography Handbook]


			*{{Dmoz\|/Science/Chemistry/Analytical/Separations_Science/Liquid_Chromatography/Products_and_Services/Instruments\|LC Instruments}}
			<!--========================({{No More Links}})============================
			\| PLEASE BE CAUTIOUS IN ADDING MORE LINKS TO THIS ARTICLE. WIKIPEDIA \|
			\| IS NOT A COLLECTION OF LINKS NOR SHOULD IT BE USED FOR ADVERTISING. \|
			\| \|
			\| Excessive or inappropriate links WILL BE DELETED. \|
			\| See [[Wikipedia:External links]] & [[Wikipedia:Spam]] for details. \|
			\| \|
			\| If there are already plentiful links, please propose additions or \|
			\| replacements on this article's discussion page, or submit your link \|
			\| to the relevant category at the Open Directory Project (dmoz.org) \|
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			{{chromatography}}

			[[Category:Chromatography]]

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