1. A storage solvent for long-term storage of a column comprising porous particles comprising a silicon-based inorganic-organic hybrid material for performing protein-based size exclusion chromatography, the storage solvent comprising water, from 5 to 15 vol % acetonitrile, from 5 to 100 mM of an alkali metal phosphate salt, and from 50 to 200 mM potassium chloride, wherein the storage solvent is for storing the column for a period of at least two weeks while providing a start peak-height to valley-height ratio (p/v) greater than 1.3.
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