Thermodynamic property values of selected polycyclic aromatic hydrocarbons measured by differential scanning calorimetry

Kestens, Vikram; Auclair, Guy; Drożdżewska, K.; Held, Andrea; Roebben, Gert; Linsinger, Thomas P. J.

doi:10.1007/s10973-009-0440-6

Cited by 15 publications

(2 citation statements)

References 15 publications

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“…The slope and intercept of the Ts versus the corrected 1/F curve was obtained by a least-square fit to a straight line. The sample impurity, obtained from the slope of the curve, was converted into sample purity (1-impurity) [40].…”

Section: Dose Kgymentioning

confidence: 99%

Investigation of thermochemical Features of Gamma Irradiated Tryptophan Stereoisomers

et al. 2021

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Abstract. In this work, the use of differential scanning calorimetry (DSC) is demonstrated as a powerful technique that can provide accurate thermodynamic property values of nutritional supplements such as tryptophan. Nutritional supplements require a decontamination procedure and irradiation appears as a promising technique for this purpose. The valuable properties of tryptophan for food and pharmaceutical industry as dietary supplement have led to increasing interest in its technological behaviour. L-, D- isomers and DL-racemic mixture of tryptophan irradiated and non-irradiated were studied by DSC. Irradiation was performed at room temperature with gamma radiations using a 137Cs source, the irradiation dose range was between 0.6- 10 kGy. Two steps decomposition pattern for both irradiated and non-irradiated samples up to 350 oC was found. Fourier transform infrared spectroscopic studies were performed. The obtained results indicate that the irradiation process does not inhibit the thermal properties of tryptophan when irradiated up to 10 kGy. The HPLC method was employed to evidence the degradation of the irradiated material. Resumen. En este trabajo, se demuestra el uso de calorimetría diferencial de barrido (DSC) como una técnica poderosa que puede proporcionar valores precisos de propiedades termodinámicas de suplementos nutricionales como el triptófano. Los suplementos nutricionales requieren un procedimiento de descontaminación y la irradiación aparece como una técnica prometedora para este propósito. Las valiosas propiedades del triptófano para la industria alimentaria y farmacéutica como suplemento dietético han provocado un creciente interés por su comportamiento tecnológico. Los isómeros L-, D- y la mezcla racémica DL- de triptófano irradiado y no irradiado fueron estudiados por DSC. La irradiación se realizó a temperatura ambiente con radiaciones gamma utilizando una fuente de 137Cs, el rango de dosis de irradiación estuvo entre 0.6 - 10 kGy. Se encontró un patrón de descomposición de dos pasos para muestras irradiadas y no irradiadas hasta 350 ºC. Se realizaron estudios espectroscópicos de infrarrojos por la transformada de Fourier. Los resultados obtenidos indican que el proceso de irradiación no inhibe las propiedades térmicas del triptófano cuando se irradia hasta 10 kGy. Se empleó el método HPLC para evidenciar la degradación del material irradiado.

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Section: Dose Kgymentioning

confidence: 99%

Investigation of thermochemical Features of Gamma Irradiated Tryptophan Stereoisomers

et al. 2021

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“…They did this by creating two binary phase diagrams in order to determine the virtual discotic liquid crystal to liquid transition for a Table 1. The chemical structures, melting points (°C) and associated enthalpies of transition (kJ mol −1 ) determined for the variety of cyclic and linear polyaromatics under investigation [27][28][29][30][31][32]. compound exhibiting no discotic phases (stable or monotropic).…”

Section: Extrapolation Of the Values For The Virtual Clearing Points mentioning

confidence: 99%

Rods to discs in the study of mesomorphism in discotic liquid crystals

et al. 2018

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The rational design of calamitic liquid crystals is an area of research that has been intensively explored due to their extensive applications in various devices. The successful methods for design have been, to some extent, mapped on discotic systems such that certain features of the structures of calamitic phases have been superimposed upon those of nematic discotic and columnar phases. In this article, we explore the correlation between nematogenic behaviour of hard rod-like particles and that of hard disc-like systems. We show that for calamitics, nematic behaviour is observed, whereas for discotics this is not the case. Furthermore, we show that nematic discotic materials are miscible, whereas unlike smectics, columnar phases are less likely to be miscible. Indeed, it appears that columnar discotic phases are greater similarities with softsolids than true liquid crystals. ARTICLE HISTORY

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Development and validation of a differential scanning calorimetry purity determination method for polycyclic aromatic hydrocarbons

2010

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Thermodynamic property values of selected polycyclic aromatic hydrocarbons measured by differential scanning calorimetry

Cited by 15 publications

References 15 publications

Investigation of thermochemical Features of Gamma Irradiated Tryptophan Stereoisomers

Investigation of thermochemical Features of Gamma Irradiated Tryptophan Stereoisomers

Rods to discs in the study of mesomorphism in discotic liquid crystals

Development and validation of a differential scanning calorimetry purity determination method for polycyclic aromatic hydrocarbons

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