AG® 501-X8 Mixed Bead Resins are used for deionizing water and preparing nonionic reagents for critical analytical applications

AG® 11 A8 Ion Retardation Resin is useful for desalting, or removing acid from nonionic molecules. This resin selectively retards ionic substances, so it can be used for both desalting nonionic solutions, and for separating ions from ionic substances. Organic molecules, even ionic species such as acidic and basic amino acids, are usually not absorbed by AG® 11 A8 Resin, whereas inorganic ions are absorbed. The spherical resin beads contain paired anion and cation exchange sites, giving a molecular mixture of a cation and anion exchanger.

Molecular biology grade resins are certified to be endo- and exonuclease-free and to contain no ligase inhibitors. Biotechnology grade resins are certified to contain less than 100 microorganisms per gram.

Commonly the batch method is used to obtain purified reagents such as urea, acrylamide, formamide, glyoxal, or PEG. These mixed bed resins consists of equivalent amounts of AG® 50W-X8 Strong Cation Exchange Resin H+ form and AG® 1-X8 Strong Anion Exchange Resin OH- form. Bio-Rex™ MSZ 501(D) Resin is similar to AG® 501-X8 Resin, but the uniform bead size minimizes pressure drops, increases resin capacity, and allows shorter regeneration times. AG® 501- X8(D) Resin and and Bio-Rex™ MSZ 501(D) Resin have a blue dye irreversibly bound to the anion exchange resin, which turns from blue to gold when the exchange capacity is exhausted.

Molecular weight: ~1,000 Da