In our lab. we needed to know: what is a good water-soluble "small molecule" marker for size-exclusion peptide chromatography? We are monitoring UV at 280 nm. Nicotinamide came to mind, which led to the question: what is the absorbance of nicotinamide at 280 nm? This led to the question I really want to ask sci.chemists:

Is there some databank of UV (and other?) spectra accessible by email, perhaps even as a graph?