Micotoxinas e seus efeitos à saúde humana: revisão de literatura / Mycotoxins and their effects on human health: literature review

Fungos são microrganismos que se desenvolvem em ambientes úmidos, produzindo, como metabolito secundário, micotoxinas, que contaminam alimentos e trazem danos à saúde. As micotoxinas são metabólicos produzidos por determinados gêneros de fungos filamentosos que acometem os produtos alimentícios e que, quando ingeridos, podem causar distúrbios ao organismo humano. Fungos se desenvolvem nos alimentos em qualquer fase do processo tendo condições favoráveis a eles, e uma vez que o alimento seja acometido pelo fungo as micotoxinas podem permanecer no alimento após a morte do fungo que as produz. Logo se faz pensar nos produtos ofertados. Este estudo constitui-se de uma revisão da literatura especializada, enfatizando os danos que os alimentos com micotoxinas podem causar ao organismo do ser humano. Para a coleta utilizaram-se o banco de dados Medline e os sites National Libray of Medicine (PubMed) e Scientific Eletronic Libray Online (SciELO), por meio das palavras-chave: fungos filamentosos; micotoxinas; produtos alimentícios. Sabe se que há um vasto número de micotoxinas, mas visando não só a perda econômica, mas também a saúde, pesquisas vêm se concentrando em algumas micotoxinas por apresentarem danos significativos já comprovados à saúde humana e animal, sem se descartar a possibilidade de outras apresentarem risco a saúde humana.

Fungi are microorganisms that grow in humid environments, producing, as a secondary metabolite, mycotoxins that contaminate food and bring harm to health. Metabolic mycotoxins are produced by certain genera of filamentous fungi that affect food products and which when ingested can cause disturbances to the human organism. Fungi develop in foods at any stage of the process having favorable conditions for them, and once the food is affected by the fungus the mycotoxins may remain in the food after the death of the fungus that produces them. One soon thinks about the products offered. This study is a review of the specialized literature, emphasizing the damage that foods with mycotoxins can cause to the human body. For collection it was used the Medline database and the National Libray of Medicine (Pubmed) and Scientific Electronic Libray Online (SciELO) websites, through the keywords: filamentous fungi; mycotoxins; food products. It is known that there is a large number of mycotoxins, but aiming not only economic loss, but also health, research has focused on some mycotoxins due to already proven significant damage to human and animal health, without ruling out the possibility of others presenting risk to human health.

Microbiological quality of enteral feeding and infant formula produced in dietary units, according to the triad of Donabedian.

INTRODUCTION AND AIMS: Microbial contamination of enteral feeding and infant formulas can result in a risk of worsening of the clinical condition of the patients, who are already weakened and susceptible to pathogens. The objective was to evaluate aspects of the management of quality hygienic - sanitary of enteral feeding and infant formulas in hospitals, focusing on the structure, process and outcome. METHODS: An observational, descriptive, prospective, with quantitative and qualitative variables study was done. The survey was conducted for 12 months and 227 samples of enteral feeding and 176 of infant formula were collected in Nutrition and Dietetic Services of Health Secretary / Federal District. In evaluating the operating conditions, the Tool 2 was applied to: Enteral Nutrition Preparation. Data were analyzed from the unified Donabedian's triad for evaluation of health services. RESULTS: The results obtained with the Tool 2 demonstrated that the Storage Block complies with legal requirements. Moreover, Dressing Block is a risk factor for the contamination. From the 403 samples, 56% corresponded to samples of Enteral Nutrition and 44% to samples of Infant Formulas. The data indicate that from 227 samples of Enteral Nutrition, 6.2% were in disagreement with the legislation, while from 176 samples of Infant Formulas, 4.6% were also in disagreement with the legislation. CONCLUSION: The ineffective implementation of the sanitary and hygienic requirements during the preparation results in a microbiologically unsafe product to patients in debilitated health state, and the count of mesophilic microorganisms can be a good indicator of microbiological safety.

Introducción y objetivo: La contaminación microbiológica de dietas enterales y fórmulas infantiles puede conducir a una situación de riesgo de agravación del cuadro clínico de pacientes, ya debilitados y susceptibles a los agentes patógenos. El objetivo fue evaluar aspectos de la gestión de calidad de condiciones sanitarias de dietas enterales y fórmulas infantiles en los hospitales, centrándose en estructura, proceso y resultado. Métodos: Fue hecho un estudio observacional, descriptivo, prospectivo, con variables cuantitativas y cualitativas. La encuesta fue por 12 meses y se recogieron 227 muestras de dietas enterales y 176 de fórmulas infantiles en los Servicios de Nutrición y Dietética de la Secretaría de Estado de Salud del Distrito Federal. Los datos fueron analizados a partir de la Tríada de Donabedian para la evaluación de los servicios de salud por medio de un cuestionario. Resultados: Los resultados obtenidos muestran que en Bloque Almacenamiento cumple con los requisitos legales. Por otro lado, el Bloque Vestuario es un factor de riesgo de contaminación. De las 403 muestras, 56% eran muestras de Nutrición Enteral y 44%, muestras de Fórmulas Infantiles. Los datos indican que de 227 muestras de Nutrición Enteral, un 6,2% estaban en desacuerdo con la ley, mientras que de las 176 muestras de las Fórmulas Infantiles, 4,6% también estaban en desacuerdo con la legislación. Conclusión: La falta de aplicación efectiva de requisitos higiénicos sanitários durante la preparación resulta en producto microbiológicamente inseguro para pacientes debilitados, y el recuento de mesófilos totales puede ser un buen indicador de la seguridad microbiológica.

Microbiological quality of enteral feeding and infant formula produced in dietary units, according to the triad of Donabedian / Calidad microbiológica de dietas enterales y fórmulas infantiles producidas en unidades dietéticas, de acuerdo con la tríada de Donabedian

Introduction and aims: Microbial contamination of enteral feeding and infant formulas can result in a risk of worsening of the clinical condition of the patients, who are already weakened and susceptible to pathogens. The objective was to evaluate aspects of the management of quality hygienic - sanitary of enteral feeding and infant formulas in hospitals, focusing on the structure, process and outcome. Methods: An observational, descriptive, prospective, with quantitative and qualitative variables study was done. The survey was conducted for 12 months and 227 samples of enteral feeding and 176 of infant formula were collected in Nutrition and Dietetic Services of Health Secretary / Federal District. In evaluating the operating conditions, the Tool 2 was applied to: Enteral Nutrition Preparation. Data were analyzed from the unified Donabedian’s triad for evaluation of health services. Results: The results obtained with the Tool 2 demonstrated that the Storage Block complies with legal requirements. Moreover, Dressing Block is a risk factor for the contamination. From the 403 samples, 56% corresponded to samples of Enteral Nutrition and 44% to samples of Infant Formulas. The data indicate that from 227 samples of Enteral Nutrition, 6.2% were in disagreement with the legislation, while from 176 samples of Infant Formulas, 4.6% were also in disagreement with the legislation. Conclusion: The ineffective implementation of the sanitary and hygienic requirements during the preparation results in a microbiologically unsafe product to patients in debilitated health state, and the count of mesophilic microorganisms can be a good indicator of microbiological safety (AU)

Introducción y objetivo: La contaminación microbioló- gica de dietas enterales y fórmulas infantiles puede conducir a una situación de riesgo de agravación del cuadro clínico de pacientes, ya debilitados y susceptibles a los agentes patógenos. El objetivo fue evaluar aspectos de la gestión de calidad de condiciones sanitarias de dietas enterales y fórmulas infantiles en los hospitales, centrándose en estructura, proceso y resultado. Métodos: Fue hecho un estudio observacional, descriptivo, prospectivo, con variables cuantitativas y cualitativas. La encuesta fue por 12 meses y se recogieron 227 muestras de dietas enterales y 176 de fórmulas infantiles en los Servicios de Nutrición y Dietética de la Secretaría de Estado de Salud del Distrito Federal. Los datos fueron analizados a partir de la Tríada de Donabedian para la evaluación de los servicios de salud por medio de un cuestionario. Resultados: Los resultados obtenidos muestran que en Bloque Almacenamiento cumple con los requisitos legales. Por otro lado, el Bloque Vestuario es un factor de riesgo de contaminación. De las 403 muestras, 56% eran muestras de Nutrición Enteral y 44%, muestras de Fórmulas Infantiles. Los datos indican que de 227 muestras de Nutrición Enteral, un 6,2% estaban en desacuerdo con la ley, mientras que de las 176 muestras de las Fórmulas Infantiles, 4,6% también estaban en desacuerdo con la legislación. Conclusión: La falta de aplicación efectiva de requisitos higiénicos sanitarios durante la preparación resulta en producto microbiológicamente inseguro para pacientes debilitados, y el recuento de mesófilos totales puede ser un buen indicador de la seguridad microbiológica (AU)

Mutation patterns of mtDNA: empirical inferences for the coding region.

BACKGROUND: Human mitochondrial DNA (mtDNA) has been extensively used in population and evolutionary genetics studies. Thus, a valid estimate of human mtDNA evolutionary rate is important in many research fields. The small number of estimations performed for the coding region of the molecule, showed important differences between phylogenetic and empirical approaches. We analyzed a portion of the coding region of mtDNA (tRNALeu, ND1 and tRNAIle genes), using individuals belonging to extended families from the Azores Islands (Portugal) with the main aim of providing empirical estimations of the mutation rate of the coding region of mtDNA under different assumptions, and hence to better understand the mtDNA evolutionary process. RESULTS: Heteroplasmy was detected in 6.5% (3/46) of the families analyzed. In all of the families the presence of mtDNA heteroplasmy resulted from three new point mutations, and no cases of insertions or deletions were identified. Major differences were found in the proportion and type of heteroplasmy found in the genes studied when compared to those obtained in a previous report for the D-loop. Our empirical estimation of mtDNA coding region mutation rate, calculated taking into account the sex of individuals carrying new mutations, the probability of intra-individual fixation of mutations present in heteroplasmy and, to the possible extent, the effect of selection, is similar to that obtained using phylogenetic approaches. CONCLUSION: Based on our results, the discrepancy previously reported between the human mtDNA coding region mutation rates observed along evolutionary timescales and estimations obtained using family pedigrees can be resolved when correcting for the previously cited factors.