Geopolymers
Inorganic polymeric new materials
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Adelia Emilia de Almeida
Adelia Emilia de Almeida
Faculdade de Ciências Farmacêuticas, Departamento de Fármacos e Medicamentos, Universidade Estadual Paulista, Rodovia Araraquara-Jau Km 1 CP 502, Araraquara, SP, 14801-902, Brazil
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Ana Luiza Ribeiro Souza
Ana Luiza Ribeiro Souza
Faculdade de Ciências Farmacêuticas, Departamento de Fármacos e Medicamentos, Universidade Estadual Paulista, Rodovia Araraquara-Jau Km 1 CP 502, Araraquara, SP, 14801-902, Brazil
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Douglas Lopes Cassimiro
Douglas Lopes Cassimiro
Departamento de Química Analítica, Universidade Estadual Paulista, Instituto de Química, R. Prof. Francisco Degni, s/n, CP 355, Araraquara, SP, 14801-970, Brazil
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Maria Palmira Daflon Gremião
Maria Palmira Daflon Gremião
Faculdade de Ciências Farmacêuticas, Departamento de Fármacos e Medicamentos, Universidade Estadual Paulista, Rodovia Araraquara-Jau Km 1 CP 502, Araraquara, SP, 14801-902, Brazil
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Clóvis Augusto Ribeiro
Clóvis Augusto Ribeiro
Departamento de Química Analítica, Universidade Estadual Paulista, Instituto de Química, R. Prof. Francisco Degni, s/n, CP 355, Araraquara, SP, 14801-970, Brazil
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Marisa Spirandeli Crespi
Marisa Spirandeli Crespi
Departamento de Química Analítica, Universidade Estadual Paulista, Instituto de Química, R. Prof. Francisco Degni, s/n, CP 355, Araraquara, SP, 14801-970, Brazil
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Abstract
Solid lipid nanoparticles (SLNs), loaded and unloaded with praziquantel (PRZ-load SLN and PRZ-unload SLN) were prepared by two different procedures: (a) oil-in-water hot microemulsion method, obtaining at 70 °C an optically transparent blend composed of surfactant, co-surfactant, and water; and (b) oil-in-water microemulsion method, dissolving the lipid in an immiscible organic solvent, emulsified in water containing surfactants and co-surfactant, and then evaporated under reduced pressure at 50 °C. The mean diameter, polydispersity index (PdI), and zeta potential were 187 to 665 nm, 0.300 to 0.655, and −25 to −28 mV respectively, depending on the preparation method. The components, binary mixture, SLNs loaded and unloaded with PRZ, and physical mixture were evaluated by differential scanning calorimetry (DSC) and thermogravimetry (TG). The non-isothermal isoconversional Flynn-Wall–Ozawa method was used to determine the kinetic parameters associated with the thermal decomposition of the samples. The experimental data indicated a linear relationship between the apparent activation energy E and the pre-exponential factor A, also called the kinetic compensation effect (KCE), allowing us to determine the stability with respect to the preparation method. Loading with PRZ increased the thermal stability of the SLNs.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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