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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Desenvolvimento e validação de métodos analíticos para determinação de ferro (II) em preparações farmacêuticas de ferro bisglicinado / Development and validation of analytical methods for determination of Fe(II) in ferrous bisglycinate pharmaceutical preparations

Ceni, Danieli Cátia January 2009 (has links)
Ferro bisglicinado (Fe-bis-gli) é um aminoácido quelado, formado pela ligação de duas moléculas de glicina a uma molécula de ferro (II), utilizado para prevenção e tratamento da anemia ferropriva. Não há descrição de métodos analíticos em códigos oficiais para o controle de qualidade do ferro bisglicinado em formas farmacêuticas. É comercializado na forma de cápsulas, produzidas por farmácias magistrais e em forma oral líquida. Deste modo, o objetivo deste trabalho foi a validação de métodos analíticos para o controle qualitativo e quantitativo do Febis- gli em cápsulas e forma oral líquida. A identificação e caracterização do fármaco foram realizadas através da determinação dos caracteres físicos, solubilidade, aquametria, espectrofotometria na região do infravermelho (IV), reações específicas e espectroscopia de Mössbauer. Para a determinação quantitativa foram validados métodos de espectrofotometria na região do visível (VIS), ordem-zero e primeira derivada (VIS-D¹), e cromatografia líquida de alta eficiência (CLAE). A análise estatística demonstrou equivalência entre os métodos CLAE / VIS para a determinação do teor das cápsulas e entre os métodos CLAE / VIS-D¹ para a determinação do Fe-bis-gli na forma oral líquida. / Ferrous bisglicycinate (Fe-bis-gli) is an amino acid chelate which is formed by the binding of two molecules of glycine to one molecule of Fe(II), used for prevention and treatment of iron deficiency. There are no analytical methods in official codes for the quality control of Fe-bis-gli in pharmaceutical forms; however it is marketed in the form of capsules , produced by compounding pharmacies and as oral liquid form. The aim of this work was the validation of analytical methods for the qualitative and quantitative analysis of Fe-bis-gli capsules and oral liquid form. The identification and characterization of the drug were performed through the determination of physical characteristics, solubility, water, infrared (IR), specific reactions and Mössbauer spectroscopy. For the quantitative determination VIS spectrophotometry methods have been validated, zero-order and first derivative (VIS-D¹) and high performance liquid chromatography (HPLC). Statistical analysis showed that HPLC / VIS methods were equivalent to assay capsules and HPLC / VIS-D¹ methods were equivalent to assay Fe-bis-gli in oral liquid form.
2

Desenvolvimento e validação de métodos analíticos para determinação de ferro (II) em preparações farmacêuticas de ferro bisglicinado / Development and validation of analytical methods for determination of Fe(II) in ferrous bisglycinate pharmaceutical preparations

Ceni, Danieli Cátia January 2009 (has links)
Ferro bisglicinado (Fe-bis-gli) é um aminoácido quelado, formado pela ligação de duas moléculas de glicina a uma molécula de ferro (II), utilizado para prevenção e tratamento da anemia ferropriva. Não há descrição de métodos analíticos em códigos oficiais para o controle de qualidade do ferro bisglicinado em formas farmacêuticas. É comercializado na forma de cápsulas, produzidas por farmácias magistrais e em forma oral líquida. Deste modo, o objetivo deste trabalho foi a validação de métodos analíticos para o controle qualitativo e quantitativo do Febis- gli em cápsulas e forma oral líquida. A identificação e caracterização do fármaco foram realizadas através da determinação dos caracteres físicos, solubilidade, aquametria, espectrofotometria na região do infravermelho (IV), reações específicas e espectroscopia de Mössbauer. Para a determinação quantitativa foram validados métodos de espectrofotometria na região do visível (VIS), ordem-zero e primeira derivada (VIS-D¹), e cromatografia líquida de alta eficiência (CLAE). A análise estatística demonstrou equivalência entre os métodos CLAE / VIS para a determinação do teor das cápsulas e entre os métodos CLAE / VIS-D¹ para a determinação do Fe-bis-gli na forma oral líquida. / Ferrous bisglicycinate (Fe-bis-gli) is an amino acid chelate which is formed by the binding of two molecules of glycine to one molecule of Fe(II), used for prevention and treatment of iron deficiency. There are no analytical methods in official codes for the quality control of Fe-bis-gli in pharmaceutical forms; however it is marketed in the form of capsules , produced by compounding pharmacies and as oral liquid form. The aim of this work was the validation of analytical methods for the qualitative and quantitative analysis of Fe-bis-gli capsules and oral liquid form. The identification and characterization of the drug were performed through the determination of physical characteristics, solubility, water, infrared (IR), specific reactions and Mössbauer spectroscopy. For the quantitative determination VIS spectrophotometry methods have been validated, zero-order and first derivative (VIS-D¹) and high performance liquid chromatography (HPLC). Statistical analysis showed that HPLC / VIS methods were equivalent to assay capsules and HPLC / VIS-D¹ methods were equivalent to assay Fe-bis-gli in oral liquid form.
3

Desenvolvimento e validação de métodos analíticos para determinação de ferro (II) em preparações farmacêuticas de ferro bisglicinado / Development and validation of analytical methods for determination of Fe(II) in ferrous bisglycinate pharmaceutical preparations

Ceni, Danieli Cátia January 2009 (has links)
Ferro bisglicinado (Fe-bis-gli) é um aminoácido quelado, formado pela ligação de duas moléculas de glicina a uma molécula de ferro (II), utilizado para prevenção e tratamento da anemia ferropriva. Não há descrição de métodos analíticos em códigos oficiais para o controle de qualidade do ferro bisglicinado em formas farmacêuticas. É comercializado na forma de cápsulas, produzidas por farmácias magistrais e em forma oral líquida. Deste modo, o objetivo deste trabalho foi a validação de métodos analíticos para o controle qualitativo e quantitativo do Febis- gli em cápsulas e forma oral líquida. A identificação e caracterização do fármaco foram realizadas através da determinação dos caracteres físicos, solubilidade, aquametria, espectrofotometria na região do infravermelho (IV), reações específicas e espectroscopia de Mössbauer. Para a determinação quantitativa foram validados métodos de espectrofotometria na região do visível (VIS), ordem-zero e primeira derivada (VIS-D¹), e cromatografia líquida de alta eficiência (CLAE). A análise estatística demonstrou equivalência entre os métodos CLAE / VIS para a determinação do teor das cápsulas e entre os métodos CLAE / VIS-D¹ para a determinação do Fe-bis-gli na forma oral líquida. / Ferrous bisglicycinate (Fe-bis-gli) is an amino acid chelate which is formed by the binding of two molecules of glycine to one molecule of Fe(II), used for prevention and treatment of iron deficiency. There are no analytical methods in official codes for the quality control of Fe-bis-gli in pharmaceutical forms; however it is marketed in the form of capsules , produced by compounding pharmacies and as oral liquid form. The aim of this work was the validation of analytical methods for the qualitative and quantitative analysis of Fe-bis-gli capsules and oral liquid form. The identification and characterization of the drug were performed through the determination of physical characteristics, solubility, water, infrared (IR), specific reactions and Mössbauer spectroscopy. For the quantitative determination VIS spectrophotometry methods have been validated, zero-order and first derivative (VIS-D¹) and high performance liquid chromatography (HPLC). Statistical analysis showed that HPLC / VIS methods were equivalent to assay capsules and HPLC / VIS-D¹ methods were equivalent to assay Fe-bis-gli in oral liquid form.
4

Peroxydation des lipides émulsionnés et transfert d'ions fer à l'interface huile / eau stabilisée par des protéines de lait : influence des résidus phosphates et de la stabilité du chélate de fer / Peroxidation of iron at the oil/water interface stabilized by milk proteins : influence of phosphate residues and stability of iron chelates

Guzun-Cojocaru, Tatiana 01 April 2010 (has links)
Le fer ajouté dans des systèmes complexes tels que les aliments induit divers problèmes comme l'oxydation des lipides ou la précipitation d’autres composés présents dans la matrice. Il s’en suit une diminution de sa biodisponibilité et des défauts de goût. L'utilisation de chélates de fer, comme le bisglycinate de fer ou l’EDTA de fer, constitue une voie intéressante : le fer ainsi protégé n’interagirait pas avec la matrice alimentaire. La stabilité des chélates de fer (bisglycinate de fer et NaFe EDTA), supposés peu réactif pour l’initiation de peroxydation, a été attestée sur des modèles d’émulsions huile dans eau stabilisées par du caséinate de sodium ou de la β lactoglobuline. Dans un second temps, le travail a consisté à vérifier la faible influence de ces complexes sur la nature de l’interface huile/eau (étude de la tension et de la rhéologie interfaciales). La stabilité du bisglycinate de fer en solution aqueuse et en présence de β lactoglobuline a également été évaluée en fonction du pH (pH 2, 3,5 et 6,5) par rayons X. Il a ainsi été montré que la nature des protéines formant l’interface huile/eau et le type de sels de fer jouent un rôle crucial sur la stabilité oxydative des émulsions enrichies en fer. L'affinité des protéines de lait pour les ions fer libres est le premier facteur qui contrôle la peroxydation des matières grasses par l’absence de transfert à l'interface huile/eau. La capacité du complexe bisglycinate à retenir les ions fer et donc à limiter la présence d’ions fer libres (ferriques ou ferreux) apparaît comme le second facteur principal à contrôler. La compétition pour les ions fer entre les groupes fonctionnels des protéines et les contre ions de chélates (glycinate ou EDTA) gouverne ainsi l'état d'oxydation du système dans des conditions acide/base proche de la neutralité. En milieu acide, l'oxydation est principalement gouvernée par l’instabilité du complexe bisglycinate de fer et par conséquent la lente libération fer ionique dans la phase aqueuse. Pour résumer, si le complexe de fer n’est pas déstabilisé et que la protéine à l’interface huile/eau ne présente pas de groupe fonctionnel ayant une forte affinité pour le fer, alors la peroxydation des lipides en émulsion est faible. Dans notre démonstration, si une protéine n’est pas phosphorylée et pour des pH proches de 7, alors l’émulsion ne sera pas peroxydée car le fer ne migre pas à l’interface huile/eau. / Iron incorporated into food systems induces oxidation and precipitation. The consequences are a reduced bioavailability and a modification of other food flavor. The iron chelates such as Fe-bisglycinate and Fe-EDTA represent a possibility to avoid side effects, since the iron is protected. The inertety of Fe bisglycinate and NaFe EDTA for lipid peroxidation has been verified in oil-in-water emulsion models stabilized by sodium caseinate or by β lactoglobulin through the following studies: i/ increase of primary and secondary products of oxidation, ii/ change of the properties of the oil/water interface (tension and interfacial rheology), iii/ the stability of the chelate iron (Fe-bisglycinate) in the aqueous phase with β lactoglobulin at different pH (pH 2, 3.5 and 6.5). The oil/water interface stabilized by proteins with phosphate groups has induced peroxidation, which was not observed with proteins containing no phosphate residue. These results demonstrate also that the type of iron salts plays a crucial role in the oxidative stability of emulsions. The ability of the complex to retain iron ion and to avoid “free” ferrous ion is the first important factor to be controlled. The affinity of milk proteins to bind these free iron ions is the second factor that controls the transfer to oil/water interface. To sum up, the competition for iron ions between functional groups of protein and salt counter ions (glycinate, sulfate or EDTA) governs the oxidation state of the system in neutral conditions. In acidic medium, the oxidation is mainly governed by the stability of the complex and the possibility to free iron in bulk.

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