Infrared and Raman studies on renal stones: the use of Second derivative infrared spectra, J.R. Guerra-López, J.A. Güida José Rodolfo Guerra-López, Jorge Alberto Güida

GUERRA-LOPEZ, JOSE R.; GUIDA, JORGE A.; DELLA VEDOVA, CARLOS O.

UROLOGICAL RESEARCH

SPRINGER

Año: 2010 vol. 38 p. 383 - 390

0300-5623

The purpose of the present work is to expand the analytical capabilities of infrared spectroscopy using the second derivative spectra. Derivative spectra (2DR) are a powerful analytical tool successfully used in many inorganic and organic systems and in some spectroscopies. The application of the 2DR calculation yields negative bands whose peaks widths at half height are decreased by approximately a factor of three. Therefore, the advantage of the second derivative spectra is essentially to enhance spectral resolution because its lineshape is intrinsically narrower than that of the absorption line. This enables the locations of peaks which are too closely spaced in the absorption spectrum to be resolved (shoulders or overlapped bands). Hence, two or more bands included in a broad one can be elucidated by this method. Furthermore, they also eliminate difference in background offsets and slope. Recently, we have used 2DR in the study of apatitic compounds. To our knowledge, even though the second derivative spectra have been used widely for a long period of time, there was no report of their use in the study of renal calculi compositions.