Guanidine improves DEAE anion exchange-based analytical separation of plasmid DNA.
Electrophoresis
; 42(24): 2619-2625, 2021 12.
Article
em En
| MEDLINE
| ID: mdl-34569093
ABSTRACT
Elution of strong and weak anion exchangers with sodium chloride gradients is commonly employed for analysis of sample mixtures containing different isomers of plasmid DNA. Gradient elution of a weak anion exchanger (diethylaminoethyl) in the presence of guanidine hydrochloride (Gdn) roughly doubles resolution between open-circular (oc) and supercoiled (sc) isomers. It also improves resolution among sc, linear, and multimeric/aggregated forms. Sharper elution peaks with less tailing increase sensitivity about 30%. However, elution with an exclusively Gdn gradient to 900 mM causes more than 10% loss of plasmid. Elution with a sodium chloride gradient while maintaining Gdn at a level concentration of 300 mM achieves close to 100% recovery of sc plasmid while maintaining the separation improvements achieved by exclusively Gdn elution. Corresponding improvements in separation performance are not observed on a strong (quaternary amine) anion exchanger. Other chaotropic salts do not produce a favorable result on either exchanger, nor does the inclusion of surfactants or EDTA. Selectivity of the diethylaminoethyl-Gdn method is orthogonal to electrophoresis, but with better quantification than agarose electrophoresis, better quantitative accuracy than CE, and resolution approaching CE.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Plasmídeos
/
DNA
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Cromatografia por Troca Iônica
/
Etanolaminas
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Guanidinas
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article