Study of Antibacterial Activity by Capillary Electrophoresis Using Multiple UV Detection Points

详细信息    查看全文

• 作者：Farid Oukacine ; Bernard Romestand ; David M. Goodall ; Gladys Massiera ; Laurent Garrelly ; Herv茅 Cottet
• 刊名：Analytical Chemistry
• 出版年：2012
• 出版时间：April 3, 2012
• 年：2012
• 卷：84
• 期：7
• 页码：3302-3310
• 全文大小：372K
• 年卷期：v.84,no.7(April 3, 2012)
• ISSN：1520-6882

文摘

A new methodology for an antibacterial assay based on capillary electrophoresis with multiple UV detection points has been proposed. The possible antibacterial activity of cationic molecules on bacteria (Gram-positive and Gram-negative) is studied by detecting the bacteria before, during, and after their meeting with the cationic antibacterial compound. For that, a UV area imaging detector having two loops and three detection windows was used with a 95 cm 脳100 渭m i.d. capillary. In the antibacterial assay, the bacteria (negatively charged) and the cationic molecules were injected separately from each end of the capillary. The bacteria were mobilized by anionic ITP mode while cationic molecules migrate in the opposite direction under conditions close to CZE. The cationic molecules were injected into the capillary as a broad band (injected volume about 16% of the volume of the capillary) to prevent dilution of the sample during the electrophoretic process. Bacteriolytic activity, as well as strong interactions between the small antibacterial molecules and the bacteria, can be investigated within a few minutes. The assay was used to study the antibacterial activity of dendrigraft poly-l-lysines on Micrococcus luteus and Erwinia carotovora. Because dendrigraft poly-l-lysines are nonimmunogenic and have low toxicity, this new class of dendritic biomacromolecules is very promising for antibacterial applications.