T wo-dimensional (2D) corre l ation spectro s c o py has recently received keen interest because it is a totally n ew and powerful spectral analytical method [1][2][3][4]. The 2D correlation spectroscopy enables us to obtain spectral information not readily accessible from one-dimensional spectra by spreading spectral peaks over the second dimension [1][2][3][4][5][6][7]. Band assignments and studies of inter-and intramolecular interactions become easier by selective correlations between various bands in synchronous and asynchronous 2D correlation spectra. Probing the specific order of the spectral intensity va ri ations is also possible by inspecting the asynchronous 2D spectra. Two-dimensional (2D) correlation analysis hasbeen applied to analyze protein and fat concentration-dependent near-infrared (NIR) spectral variations of milk. Synchronous and asynchronous 2D correlation spectra of milk enhance spectral resolution and provide information about concentration-dependent intensity changes not readily accessible from one-dimensional spectra. The asynchronous 2D correlation map shows marked differences between the protein and fat concentration-dependent spectral changes.

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