Thermal profile of 4,4′-dinitrocarbanilide determined by thermogravimetry–differential scanning calorimetry–mass spectrometry (TG–DSC–MS) and pyrolysis–gas chromatography–mass spectrometry (Py–GC–MS)

• Published in: Journal of thermal analysis and calorimetry Vol. 138; no. 1; pp. 697 - 701
• Main Authors: Bacila, Danniele Miranda, Lazzarotto, Marcelo, Hansel, Fabrício Augusto, Scheuermann, Gerson Neudí, Feddern, Vivian, Cunha Junior, Anildo, Igarashi-Mafra, Luciana
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-10-2019; Springer Nature B.V
• Subjects: Analytical Chemistry; Carbon dioxide; Chemistry; Chemistry and Materials Science; Chickens; Differential scanning calorimetry; Gas chromatography; Inorganic Chemistry; Isocyanates; Mass spectrometry; Measurement Science and Instrumentation; Meat; Physical Chemistry; Polymer Sciences; Pyrolysis; Scientific imaging; Spectroscopy; Thermal analysis; Thermodynamic properties; Thermogravimetry; Residue degradation; Nicarbazin; Anticoccidial; Thermal analysis; Chemical residue; Chicken meat
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-019-08194-9

Nicarbazin is an anticoccidial used in poultry production. Its residue of concern left in chicken meat is 4,4′-dinitrocarbanilide (DNC) whose content can be reduced through meat thermal processing. Thermal analysis techniques can be considered to elucidate how DNC degradation proceeds. This study aimed to investigate the thermal behavior of DNC using TG–DSC–MS and Py–GC–MS. TG–DSC–MS data showed that DNC decomposition occurs in a single step (252–280 °C) as an endothermic event (Δ
H
of 670 J g
−1
). Fragments detected at m/z 43, 44 and 65 indicated the release of isocyanic acid, carbon dioxide and 4-nitroaniline as breakdown products. In addition, Py–GC–MS analysis confirmed that DNC is thermally degraded above 250 °C generating 4-nitrophenyl isocyanate and 4-nitroaniline as the major pyrolysis products. Findings obtained from thermal analysis herein are useful to better comprehend the DNC disappearance after submitting chicken meat to heat processing.