Journal of Thermal Analysis and Calorimetry

, Volume 138, Issue 3, pp 2091–2101 | Cite as

Ponceau 4R azoic red dye

Thermal behavior, optical anisotropy and terahertz spectroscopy study
  • Marian Leulescu
  • Gabriela Iacobescu
  • Mihaela Bojan
  • Petre RotaruEmail author


The synthetic red azo dye Ponceau 4R is an additive with widely utilization in food processing technology. Thermal behavior of the trisodium (8Z)-7-oxo-8-[(4-sulfonatonaphthalen-1-yl)hydrazinylidene] naphthalene-1,3-disulfonate, appointed Ponceau 4R or E124, was studied. Thermal analysis measurements of Ponceau 4R revealed thermal stability until 300 °C. Ponceau 4R is an anisotropic crystalline dye that has the property of birefringence. The THz spectroscopy allowed the determination of the characteristic absorption frequencies of this colorant and its identification in any food. In the THz spectrum of Ponceau 4R, it can be seen that the strongest absorption is produced for the radiation with frequency of 1.41, 1.74 and 3.81 THz. THz spectroscopy of Ponceau 4R identified spectral “signatures” of azo food dye studied, which were obtained by the processing of the numerical data of THz spectroscopy.


Azoic red food dye Ponceau 4R Thermal stability Optical anisotropy THz spectroscopy 



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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Physics, Faculty of SciencesUniversity of CraiovaCraiovaRomania
  2. 2.Laser Department, Plasma and Radiation PhysicsINFLPR –National Institute for LaserBucharestRomania

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