Ceramides play a central role in cell regulation and a variety of signal tr
ansduction pathways. A simple sensitive microscale circular dichroic (CD) m
ethod utilizing zinc porphyrins has been developed for assigning the absolu
te configurations of ceramides at the nanogram scale. The assignment is bas
ed on the CD spectra of the bis (zinc porphyrin) derivatives of ceramides w
ith and without the presence of 1,3-diaminopropane. This method can also be
applied to various sphingolipids after enzymatic cleavage to ceramides. (C
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