Ana Cortez - Academia.edu (original) (raw)

Papers by Ana Cortez

Research paper thumbnail of Salmonella spp. em carcaças, carne mecanicamente separada, lingüiças e cortes comerciais de frango

Ciencia Rural, 2005

Food of animal origin represents an important role in the epidemiology of human salmonellosis. In... more Food of animal origin represents an important role in the epidemiology of human salmonellosis. In spite of the technological improvement, the chicken meat is subjected to bacterial contamination, mainly by microorganisms of the genus Salmonella that can be found in the intestinal tract or elsewhere on the chicken body. The aim of this study was to investigate the occurrence of Salmonella in chicken meat and cuts from the Northeast region of São Paulo State, Brazil. By conventional cultivation microbiological methods, 45 samples of carcasses, 60 samples of mechanically deboned meat (MDM), 25 samples of chicken sausages, 20 samples of chest, and 15 samples of chicken leg and thigh. Salmonella was found in 13.3% (6/45) of the carcass, 25% (15/60) of the MDM, 16% (4/25) of the sausages, 30% (6/20) of the chests and 13.3% (2/15) of the tight analysed. The results showed that 33 (20%) out of 165 samples were contaminated by Salmonella. Therefore, these samples were inappropriate for consumption, according to the Brazilian legislation.

Research paper thumbnail of Identification of Salmonella spp. isolates from chicken abattoirs by multiplex-PCR

Research in Veterinary Science, 2006

The present study was carried out to report the occurrence Salmonella spp., Salmonella Enteritidi... more The present study was carried out to report the occurrence Salmonella spp., Salmonella Enteritidis, and Salmonella Typhimurium in chicken abattoirs. Samples of feces; feathers; scald, evisceration, and chiller water; and rinse water of non-eviscerated, eviscerated, and chilled carcass were collected from six chicken abattoirs. Salmonella isolates were identified by a multiplex-PCR using three sets of primers targeting the invA, pefA, and sefA gene sequences from Salmonella spp., S. Typhimurium and S. Enteritidis, respectively. Salmonella spp. was detected in 10% (29/288) of the samples, whereas serovars Enteritidis and Typhimurium were identified in 62% (7/288), respectively. The results indicate the need to improve hygiene and sanitary standards in poultry slaughter lines, besides the education of food handlers and information to consumers.

Research paper thumbnail of Efeito do processamento UAT (Ultra Alta Temperatura) sobre as características físico-químicas do leite

Ciencia E Tecnologia De Alimentos, 2008

With the aim of analyzing the physicochemical characteristics of UHT milk during its industrializ... more With the aim of analyzing the physicochemical characteristics of UHT milk during its industrialization and comparing the results with the Brazilian legislation, 150 samples collected in six stages, in different processing phases, were analyzed, being 60 samples of raw milk, 60 of pasteurized milk and 30 of UHT milk. The samples were submitted to the analysis of Dornic acidity, density, fat content, total solids, solids-non-fat, freezing point, pH, methylene blue reduction, stability to 68% alcohol and screening for peroxidase and alkaline phosphatase enzymes. The results indicated that the mean values of total solids and solids-non-fat and freezing point, were in some collections, lower than the limits established in the Brazilian legislation, demonstrating a possible increase in milk water content.

Research paper thumbnail of Survey of chicken abattoir for the presence of Campylobacter jejuni and Campylobacter coli

Revista Do Instituto De Medicina Tropical De Sao Paulo, 2006

The genus Campylobacter is of great importance to public health because it includes several speci... more The genus Campylobacter is of great importance to public health because it includes several species that may cause diarrhea. These species may be found in water, food and in the intestinal tract of chickens. This study investigated the presence of Campylobacter jejuni and Campylobacter coli in chicken abattoirs in São Paulo State, Brazil. A total of 288 samples of feces, feathers, scald water, evisceration water, chiller water, and the rinse water of eviscerated, not eviscerated and chilled carcasses were collected in six chicken abattoirs. Polymerase Chain Reaction (PCR) was performed in Campylobacter spp.-positive isolates using the gene HIP, specific for hippuricase enzyme from Campylobacter jejuni and aspartokinase gene, specific to detect Campylobacter coli. The percentage of positive isolates of Campylobacter jejuni was 4.9% (14/288). Isolation was greater in feces samples (22%, 8/36). One sample was positive for the species C. coli. In conclusion, the results indicate that it is necessary to improve quality control for Campylobacter spp. in chicken abattoirs.

Research paper thumbnail of Salmonella spp. em carcaças, carne mecanicamente separada, lingüiças e cortes comerciais de frango

Ciencia Rural, 2005

Food of animal origin represents an important role in the epidemiology of human salmonellosis. In... more Food of animal origin represents an important role in the epidemiology of human salmonellosis. In spite of the technological improvement, the chicken meat is subjected to bacterial contamination, mainly by microorganisms of the genus Salmonella that can be found in the intestinal tract or elsewhere on the chicken body. The aim of this study was to investigate the occurrence of Salmonella in chicken meat and cuts from the Northeast region of São Paulo State, Brazil. By conventional cultivation microbiological methods, 45 samples of carcasses, 60 samples of mechanically deboned meat (MDM), 25 samples of chicken sausages, 20 samples of chest, and 15 samples of chicken leg and thigh. Salmonella was found in 13.3% (6/45) of the carcass, 25% (15/60) of the MDM, 16% (4/25) of the sausages, 30% (6/20) of the chests and 13.3% (2/15) of the tight analysed. The results showed that 33 (20%) out of 165 samples were contaminated by Salmonella. Therefore, these samples were inappropriate for consumption, according to the Brazilian legislation.

Research paper thumbnail of Identification of Salmonella spp. isolates from chicken abattoirs by multiplex-PCR

Research in Veterinary Science, 2006

The present study was carried out to report the occurrence Salmonella spp., Salmonella Enteritidi... more The present study was carried out to report the occurrence Salmonella spp., Salmonella Enteritidis, and Salmonella Typhimurium in chicken abattoirs. Samples of feces; feathers; scald, evisceration, and chiller water; and rinse water of non-eviscerated, eviscerated, and chilled carcass were collected from six chicken abattoirs. Salmonella isolates were identified by a multiplex-PCR using three sets of primers targeting the invA, pefA, and sefA gene sequences from Salmonella spp., S. Typhimurium and S. Enteritidis, respectively. Salmonella spp. was detected in 10% (29/288) of the samples, whereas serovars Enteritidis and Typhimurium were identified in 62% (7/288), respectively. The results indicate the need to improve hygiene and sanitary standards in poultry slaughter lines, besides the education of food handlers and information to consumers.

Research paper thumbnail of Efeito do processamento UAT (Ultra Alta Temperatura) sobre as características físico-químicas do leite

Ciencia E Tecnologia De Alimentos, 2008

With the aim of analyzing the physicochemical characteristics of UHT milk during its industrializ... more With the aim of analyzing the physicochemical characteristics of UHT milk during its industrialization and comparing the results with the Brazilian legislation, 150 samples collected in six stages, in different processing phases, were analyzed, being 60 samples of raw milk, 60 of pasteurized milk and 30 of UHT milk. The samples were submitted to the analysis of Dornic acidity, density, fat content, total solids, solids-non-fat, freezing point, pH, methylene blue reduction, stability to 68% alcohol and screening for peroxidase and alkaline phosphatase enzymes. The results indicated that the mean values of total solids and solids-non-fat and freezing point, were in some collections, lower than the limits established in the Brazilian legislation, demonstrating a possible increase in milk water content.

Research paper thumbnail of Survey of chicken abattoir for the presence of Campylobacter jejuni and Campylobacter coli

Revista Do Instituto De Medicina Tropical De Sao Paulo, 2006

The genus Campylobacter is of great importance to public health because it includes several speci... more The genus Campylobacter is of great importance to public health because it includes several species that may cause diarrhea. These species may be found in water, food and in the intestinal tract of chickens. This study investigated the presence of Campylobacter jejuni and Campylobacter coli in chicken abattoirs in São Paulo State, Brazil. A total of 288 samples of feces, feathers, scald water, evisceration water, chiller water, and the rinse water of eviscerated, not eviscerated and chilled carcasses were collected in six chicken abattoirs. Polymerase Chain Reaction (PCR) was performed in Campylobacter spp.-positive isolates using the gene HIP, specific for hippuricase enzyme from Campylobacter jejuni and aspartokinase gene, specific to detect Campylobacter coli. The percentage of positive isolates of Campylobacter jejuni was 4.9% (14/288). Isolation was greater in feces samples (22%, 8/36). One sample was positive for the species C. coli. In conclusion, the results indicate that it is necessary to improve quality control for Campylobacter spp. in chicken abattoirs.