Alumina-B Column Plates for Solid Phase Extraction

Alumina is a typical Lewis acid that does not have two electrons in the center of the aluminum atom, it is a strong polar adsorbent similar to silica gel; It is available in three high activity levels: acidic, basic, and neutral; alumina also has a special effect on the π-electrons of aromatic hydrocarbons; and it is more stable than silica gel under high pH conditions. The main confinement mechanisms are the Lewis acid-base interaction, the polar interaction, and ion exchange.
The surface of B&M® Alumina-B (pH = 10) is oriented to retain positively charged or hydrogen-bonded substances. Alumina pre-treated with alkaline solutions has anionic properties and is cation exchange. In addition, it retains electron-donor samples such as neutral amines, although the surface also has the properties of a Lewis base. This ability is much lower for neutral and acidic alumina. In addition, strong hydrogen bonding is possible on alumina-B, making it useful for polar cationic samples.