Journal of thermal analysis

, Volume 38, Issue 11, pp 2549–2552 | Cite as

Some observations on the thermal behaviour of curcumin under air and argon atmospheres

  • F. Jasim
  • T. Talib
Short Communication

Abstract

The TG, DTG and DTA curves of curcumin(I) have been recorded in static air and inert dynamic argon atmosphere over the range between ambient temperature and 600°–700°C using a Netzsch thermal analyser STA 429. Careful examination of these curves reveals appreciable differences in the behaviour of I under either atmospheres, which are easily recognized by comparing the profiles of their thermal curves, particularly in the melting point, thermalL stability of intermediates, percent weight loss and exothermicity of the chemical processes. Gaschromatographic analysis of volatile pyrolysates trapped during thermal analysis indicates the formation of (CH3)2CO, CH3COH and C6H5OCH2COOH (phenyl oxyacetic acid). However, in static air CO2 and H2O were identified as well. X-ray diffractometry reveals the formation of amorphous carbon as a final product in argon and a mixture of amorphous carbon and graphite in air. It seems that the relatively high mass of argon plays an important role in the reactions and stability of intermediates. In either atmospheres curcumin is thermally stable up to 249°C withm.p. of 176.4°–177.5°C. The unique shape of the DTA curve of I could be used forits identification.

Keywords

curcumin gas-chromatographic analysis TG-DTG-DTA 

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References

  1. 1.
    F. Jasim and F. Ali, Microchem. J., 39 (1989) 156.CrossRefGoogle Scholar
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    Idem, 38 (1988) 106.CrossRefGoogle Scholar
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    F. Jasim and I. Jameel, Thermochim. Acta, 147 (1989) 99.CrossRefGoogle Scholar

Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1992

Authors and Affiliations

  • F. Jasim
    • 1
  • T. Talib
    • 1
  1. 1.Department of Chemistry, College of ScienceUniversity BaghdadJadriya, BaghdadIraq

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