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  • Author or Editor: G. Chierice x
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Abstract  

Investigation on the nature of an initial mass loss observed for Mn(II)pyrrolidinedithiocarbamate complex is described. No evidences of decomposition are observed in infrared or mass spectra, elemental analysis and scanning electron microscopy of the residue at the end of the first thermal event, when compared with the same data for the original complex. Partial sublimation is assigned as the physical event after several experiments. The results are comparable with the findings for other complexes of the first transition series with pirrolidinedithiocarbamate.

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Abstract  

Eugenol is an allyl chain-substituted guaiacol in the biosynthesized phenylpropanoid compound class derived from Syzygium aromaticum L. and widely used in folk medicine. Nonetheless, its pharmacological use is limited by some problems, such as instability when exposed to light and high temperature. In order to enhance stability, the eugenol molecule was structurally modified, resulting in eugenyl acetate. The eugenyl acetate’s thermal behavior and crystal structure was then characterized by differential scanning calorimetry (DSC) and X-ray diffraction (XRD) and compared to a commercial sample.

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Abstract  

A capillary long neck glass sample holder is proposed for the determination of boiling temperatures of essential oils containing a majority component. Essential oils from Aniba dukei K. and Pimenta dioica L. containing linalool and eugenol, respectively, as major constituents were used after optimization of parameters such as scan rate, sample mass and starting temperature. Best performance in the determination of boiling temperatures was obtained with the proposed sample holder in comparison with commercial aluminum pans. Good agreement was obtained for the boiling temperature and enthalpy for the essential oil samples with the linalool and eugenol standards.

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