Análise das propriedades físico-químicas da glucosamina sulfato comercial, uma matéria- prima utilizada em formulações farmacêuticas / Physicochemical properties analysis of commercial glucosamine sulfate, a raw material used in pharmaceutical formulations

Introdução: A qualidade dos produtos em farmácias de manipulação é determinada pela Agência Nacional de Vigilância Sanitária (ANVISA), mas os métodos descritos podem não ser adequados para analisar seus aspectos físico-químicos. Objetivo: Comparar aspectos físico-químicos da glucosamina sulfato de dois diferentes fornecedores com análises realizadas na farmácia de manipulação. Métodos: As características organolépticas, pH, solubilidade e densidade da glucosamina (n=50) dos fornecedores foram analisadas conforme descrito na Farmacopeia Brasileira e Compêndio Oficial e comparados aos laudos técnicos dos produtos adquiridos. Usaram-se os testes de Kolmogorov-Smirnov, coeficiente de correlação intraclasse (CCI) e Bland-Altman. Resultados: A análise de CCIevidenciou baixa reprodutibilidade para o teste de pH e densidade, e a análise de Bland-Altman demonstrou que os fornecedores subestimavam ou superestimavam os valores de pH e densidade em relação à farmácia. Conclusão: Os aspectos físico-químicos estão adequados conforme orientações da Anvisa, mas novas técnicas mais sensíveis devem ser utilizadas para garantir a qualidade da glucosamina nas formulações.

Introduction: The raw materials quality in the manipulation pharmacies are determined by Brazilian Health Surveillance Agency (ANVISA), but the protocols described may not be appropriate to analyze their physicochemical properties. Objective: To compare the physicochemical properties of glucosamine sulfate from two different suppliers with results obtained in the manipulation pharmacy. Methods: The organoleptic characteristics, pH, solubility and density of glucosamine samples (n=50) were analyzed according to the Brazilian Pharmacopoeia and Official Compendium and compared the technical reports of the suppliers. The results were analyzed by the Kolmogorov-Smirnov test, intraclass correlation coefficient (CCI) and Bland-Altman. Results: CCI analyses showed low reproducibility for pH and density test in the samples tested. In addition, Bland-Altman analysis indicated pH values and density of suppliers were underestimated or overestimated compared to the pharmacy. Conclusion: Physicochemical properties of glucosamine are appropriate according to Anvisa specifications, but new more sensitive techniques should be employed to ensure the glucosamine quality in the formulations.

Angiotensin-converting enzyme inhibitors of Bothrops jararaca snake venom affect the structure of mice seminiferous epithelium

Background Considering the similarity between the testis-specific isoform of angiotensin-converting enzyme and the C-terminal catalytic domain of somatic ACE as well as the structural and functional variability of its natural inhibitors, known as bradykinin-potentiating peptides (BPPs), the effects of different synthetic peptides, BPP-10c ( ENWPHQIPP), BPP-11e ( EARPPHPPIPP), BPP-AP ( EARPPHPPIPPAP) and captopril were evaluated in the seminiferous epithelium of male mice.Methods The adult animals received either one of the synthetic peptides or captopril (120 nmol/dose per testis) via injection into the testicular parenchyma. After seven days, the mice were sacrificed, and the testes were collected for histopathological evaluation.Results BPP-10c and BPP-AP showed an intense disruption of the epithelium, presence of atypical multinucleated cells in the lumen and high degree of seminiferous tubule degeneration, especially in BPP-AP-treated animals. In addition, both synthetic peptides led to a significant reduction in the number of spermatocytes and round spermatids in stages I, V and VII/VIII of the seminiferous cycle, thickness of the seminiferous epithelium and diameter of the seminiferous tubule lumen. Interestingly, no morphological or morphometric alterations were observed in animals treated with captopril or BPP-11e.Conclusions The major finding of the present study was that the demonstrated effects of BPP-10c and BPP-AP on the seminiferous epithelium are dependent on their primary structure and cannot be extrapolated to other BPPs.

Angiotensin-converting enzyme inhibitors of Bothrops jararaca snake venom affect the structure of mice seminiferous epithelium

Background Considering the similarity between the testis-specific isoform of angiotensin-converting enzyme and the C-terminal catalytic domain of somatic ACE as well as the structural and functional variability of its natural inhibitors, known as bradykinin-potentiating peptides (BPPs), the effects of different synthetic peptides, BPP-10c (<ENWPHQIPP), BPP-11e (<EARPPHPPIPP), BPP-AP (<EARPPHPPIPPAP) and captopril were evaluated in the seminiferous epithelium of male mice.Methods The adult animals received either one of the synthetic peptides or captopril (120 nmol/dose per testis) via injection into the testicular parenchyma. After seven days, the mice were sacrificed, and the testes were collected for histopathological evaluation.Results BPP-10c and BPP-AP showed an intense disruption of the epithelium, presence of atypical multinucleated cells in the lumen and high degree of seminiferous tubule degeneration, especially in BPP-AP-treated animals. In addition, both synthetic peptides led to a significant reduction in the number of spermatocytes and round spermatids in stages I, V and VII/VIII of the seminiferous cycle, thickness of the seminiferous epithelium and diameter of the seminiferous tubule lumen. Interestingly, no morphological or morphometric alterations were observed in animals treated with captopril or BPP-11e.Conclusions The major finding of the present study was that the demonstrated effects of BPP-10c and BPP-AP on the seminiferous epithelium are dependent on their primary structure and cannot be extrapolated to other BPPs.(AU)