Purity and heat of fusion data for environmental standards as determined by differential scanning calorimetry

Donnelly, J.R.; Drewes, L. A.; Johnson, Rodney L.; Munslow, W.D.; Knapp, K. K.; Sovocool, G. Wayne

doi:10.1016/0040-6031(90)80476-f

Cited by 82 publications

(32 citation statements)

References 8 publications

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“…Moreover, a good agreement was found between the calculated melting enthalpies and those taken from the literature [12], and the vaporization enthalpies calculated by DSC measurements and those calculated from the Advanced Chemistry Development Software Solaris V4.67, respectively.…”

Section: Thermal Analysismentioning

confidence: 80%

Isoconversional kinetic study of alachlor and metolachlor vaporization by thermal analysis

Sbirrazzuoli

Vecchio²,

Catalani³

2004

Int J of Chemical Kinetics

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The vaporization kinetics of two acetamide pesticides, namely alachlor and metolachlor, was studied by thermogravimetric analysis under nonisothermal conditions (using heating rates between 1.0 and 10 K min −1 ). A model-free isoconversional method of kinetic analysis was proposed, and activation energy dependences on the extent of conversion α for nonisothermal experiments were given. An increase in activation energy is shown for alachlor from 50 to 60 kJ mol −1 , while E values do not significantly vary in the range α > 0.1: 63 kJ mol −1 for metolachlor while 60 kJ mol −1 for alachlor. At the end of vaporization (0.9 < α < 1.0), the activation energies are in close agreement with the enthalpies of vaporization calculated from DSC measurements. C

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Section: Thermal Analysismentioning

confidence: 80%

Isoconversional kinetic study of alachlor and metolachlor vaporization by thermal analysis

Sbirrazzuoli

Vecchio²,

Catalani³

2004

Int J of Chemical Kinetics

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“…7.179 ± 0.015 (27) (23) 15 (23) , 13.8 (18) 452.2 (19) 12.55 (19) 445.52 (20) 14.42 (20) (18) Donnelly et al, (19) and Kim et al (20) for thiourea. However, results from references 21 to 23 as a whole cannot be considered fully comparable with ours for the following reasons: commercial products were employed as received without any purification; no information is given about calibration procedures for both t.g.…”

Section: Resultsmentioning

confidence: 96%

“…After the d.s.c. measurements by Zordan et al (18) in 1972 and the more recent determinations by Donnelly et al (19) and Kim et al (20) which only concern thiourea, there have been only the t.g., d.t.a. and i.r.…”

Section: Introductionmentioning

confidence: 94%

Enthalpies and entropies of fusion and of sublimation at the temperature 298.15 K of thiourea and sevenN-alkylthioureas

Gatta

Jóźwiak

Brunetti

et al. 2000

The Journal of Chemical Thermodynamics

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“…The presence of small amounts of impurities in a substance may decrease the melting point and increase its melting range (Donnelly et al, 1990). In the literature, authors have also used DSC to determine the purity of a given substance (Ferguson et al, 2000;Schnitzler et al, 2001).…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Prednisone raw material characterization and formulation development

Toehwé¹,

Prado

Rocha

2018

Braz. J. Pharm. Sci.

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Solid dosage forms for oral use, particularly tablets, are the most highly used dosage forms in therapy because they are easily administered, have high productivity and relatively low cost and provide a more stable drug to form a semi-solid net. Numerous parameters influence the quality of the final dosage form. In this study, the dissolution profile of 20-mg prednisone tablets bioequivalent to the reference product and three test formulations were evaluated using stability testing. During the study, prednisone tablets and the active pharmaceutical ingredient (API) prednisone from two different manufacturers were characterized with respect to their physical and physicochemical properties. The results showed that the dissolution profiles of the test batches and the reference product did not retain pharmaceutical equivalence throughout all the stability study. Notably, both samples of API prednisone were of the same crystal form, and any phase transition that occurred during the study could not be attributed to dissolution variation during stability.

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Purity and heat of fusion data for environmental standards as determined by differential scanning calorimetry

Cited by 82 publications

References 8 publications

Isoconversional kinetic study of alachlor and metolachlor vaporization by thermal analysis

Isoconversional kinetic study of alachlor and metolachlor vaporization by thermal analysis

Enthalpies and entropies of fusion and of sublimation at the temperature 298.15 K of thiourea and sevenN-alkylthioureas

Prednisone raw material characterization and formulation development

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