The sublimation kinetics of amino acid l-leucine is studied with the isothermal thermogravimetric (TG) analysis at temperatures between 400.7 and 517.5 K. Sublimation of l-leucine follows zero order kinetics. l-leucine begins to sublime around 423.2 K and sublimation rate increases exponentially with increasing temperature. The vapour pressure of l-leucine is determined based on the mass loss rate showing a good correlation with literature values. Using the Arrhenius equation, the activation energy and pre-exponential factor are determined. The sublimation enthalpy and entropy are obtained using the Clausius-Clapeyron equation. © 2008 Elsevier B.V. All rights reserved.
CITATION STYLE
Lähde, A., Raula, J., Malm, J., Kauppinen, E. I., & Karppinen, M. (2009). Sublimation and vapour pressure estimation of l-leucine using thermogravimetric analysis. Thermochimica Acta, 482(1–2), 17–20. https://doi.org/10.1016/j.tca.2008.10.009
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