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Instruments that measure ultraviolet and/or visible light absorbance of a sample; they are based on the Beer-Lambert law, which states that the concentration of a solute is proportional to the absorbance of the sample. Accessories available.
MW 189.17 Da, Purity >99%. Endogenous antagonist at ionotropic, glycine β and α7 nicotinic receptors. Neuroprotective *in vivo*. Water-soluble form available - please see Kynurenic acid sodium salt (ab120256).