ABSTRACT
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Since high performance liquid chromatography (HPLC) began about 45 years ago, many HPLC stationary phases and columns have been introduced by the 50+ manufacturers from the United States and around the world. The number of chemistries (not counting particle sizes or column sizes) that are unique approaches about 800. And this number increases a few percent per year. Although this number might appear daunting, they can be broken down into various subgroups that follow.
