Thermal characterization of some guanylhydrazones by thermal and nonthermal techniques

Galvao F. P.; De Brito W. A.; Dantas M. G.Pereira M. A. V.Araujo-Junior J. X.Franca P. H. B.Santana A. E. G.Macedo R. O.Ribeiro E. A. N.Barbosa E. G.Aragao C. F. S.Gomes A. P. B.

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Thermal characterization of some guanylhydrazones by thermal and nonthermal techniques

机译：Thermal characterization of some guanylhydrazones by thermal and nonthermal techniques

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2-(3,5-di-tert-butyl-4-hydroxyphenyl)methylene-hydrazinecarboximidamide (WE010), 2-(1,1'-biphenyl-4-ylmethylene)-hydrazinecarboximidamide (WE014), and 2-(3,4-dichlorophenyl)methylene-hydrazinecarboximidamide (WE017) are guanylhydrazone derivatives widely studied biologically and chemically; however, there are no studies regarding their thermal behaviors. The present study aims to apply the thermal analyses: differential scanning calorimetry (DSC), differential scanning calorimetry coupled to the photovisual system (DSC-photovisual), and thermogravimetry (TG), to characterize the guanylhydrazones, as well as HPLC and FTIR. The DSC curve of WE010 shows a melting process with T (onset) at 190 A degrees C and peak at 193.5 A degrees C (a dagger H 41.0 J g(-1)). Due to the symmetry of the melting peaks obtained by DSC, it is possible to calculate the purity of the sample (98.87 ). The DSC curve of WE014 shows the melting process in the range of 208-213 A degrees C, with a melting peak at 211 A degrees C (a dagger H 61 J g(-1)). The DSC curve of WE017 showed T (onset) at 215 A degrees C and peak temperature of 219 A degrees C (a dagger H 55 J g(-1)). The TG curve of WE010, WE014, and WE017 presents initial decomposition temperatures of 186.95, 197.31, and 195.44 A degrees C, respectively. The DSC-photovisual confirmed the results of DSC and TG. The HPLC determined the purities of the samples and confirmed the results of DSC. The FTIR confirmed the thermal data. Thus, the use of thermal analysis is an important tool for the characterization of molecules with therapeutic potential contributing to the characterization and evaluation of their stability as well as nonthermal technique with complementary tool.

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《Journal of thermal analysis and calorimetry》 |2015年第1期|879-887|共9页
作者
Galvao F. P.; De Brito W. A.; Dantas M. G.Pereira M. A. V.Araujo-Junior J. X.Franca P. H. B.Santana A. E. G.Macedo R. O.Ribeiro E. A. N.Barbosa E. G.Aragao C. F. S.Gomes A. P. B.;
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Fed Univ Rio Grande Norte UFRN, Dept Pharmaceut Sci, Lab Qual Control LCQMed, BR-59000000 Natal, RN, Brazil;

Univ Fed Alagoas, ESENFAR, BR-57072970 Maceio, AL, Brazil;

Fed Univ Paraiba UFPB, Unified Labs Dev & Assays Med LUDEM, BR-58059900 Joao Pessoa, PB, Brazil;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
关键词
Guanylhydrazones; DSC; TG; HPLC; FTIR;

Thermal characterization of some guanylhydrazones by thermal and nonthermal techniques

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