Análise térmica e Espectroscopia Raman à temperatura ambiente de cristais L-histidina

Abstract

In this work we investigate one of the 20 amino acids that make up the proteins found in living things, the amino acid L-histidine (C 6 H 9 N 3 O 2), by Raman spectroscopy. The region spectral study was to wave numbers between 10 cm−1 and 3400 cm−1. The samples are used in powder form, comprising polycrystals. Experiments were carried out analysis Thermogravimetric (TG) and di erential scanning calorimetry (DSC) to information about the thermal properties of the material. These measurements indicated that the amino acid L-histidine has a high thermal stability up to temperatures of approximately 550 K, at which it decomposes. In the second part of the measurement was performed at room temperature Raman scattering in polycrystals of L-histidine. A rating attempt was made of the normal modes of vibration of L-histidine based on other studies on crystalline amino acids available in the literature.