Avaliação microbiológica e físico-química de pernis suínos tratados com ácidos orgânicos e/ou vapor no controle da contaminação superficial por Salmonella Typhimurium.

Asymptomatic carrier pigs are the main risk factor for carcass contamination during the slaughter. Several post-slaughter prevention programs have been tested, such as organic acids and steam under pressure. These alternatives show low cost and high efficiency. This study tested the use of organic acid solutions and steam, in isolated tests and its associations. This experiment also evaluated the physical-chemistry features of the pork. Forty pork legs were contaminated with Salmonella Typhimurium DT 177 and subsequently divided into 4 treatments: immersion in physiological solution for 5 seconds (control, T1); immersion in physiological solution with 1000 ppm of organic acids for 5 seconds (T2); sprinkling of steam under pressure (4 bar) at 140ºC (T3); and T2 after T3 (T4). An area of 100cm2 was sampled through superficial swabs for Salmonella counts by Most Probable Number method (MPN). Aspect, color, consistency, smell, and levels of fat, protein, pH, and moisture were also evaluated before and after each treatment. The use of steam associated to the immersion in organic acid solution showed better efficiency for reduction of superficial contamination (decreasing 100% of counts) but the better effectiveness was observed through the decreasing of 0.8 log of MPN at skin and 0.77 log of MPN at muscle by using the physiological solution (T1) and the organic acid solution (T2), respectively. The steam treatment associated with the organic acid solutions (T4) decreased the pH and increased moisture of pork legs, although it did not mischaracterize the quality (within required parameters for human consumption). All the other treatments did not change physical-chemistry fefatures

Uma Análise Comparativa dos Fatores de Rejeição nos Periódicos de Diferentes Estratos de Administração

Resumo A publicação de artigos científicos é um dos requisitos impostos aos pesquisadores brasileiros e contribui decisivamente para a reputação, mobilidade e benefícios financeiros destes. Para aferir a qualidade das publicações, a Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) criou o Sistema Qualis, que classifica os periódicos em oito estratos – de A1 (mais alto) a C (mais baixo), inferindo diferenças de qualidade dos artigos a partir dos estratos dos periódicos em que são publicados. Este artigo examina as falhas e as lacunas que representam fatores para a rejeição de artigos submetidos aos periódicos de Administração, comparando os motivos de rejeição entre periódicos de diferentes estratos. Metodologicamente, realizamos um estudo empírico com dados obtidos por questionário junto a 82 editores de periódicos de Administração. Contrariamente às expectativas, os resultados não deixam evidentes diferenças muito significativas nas lacunas que levam à rejeição de artigos entre periódicos de diferentes estratos. Este artigo tem contribuições e implicações para pesquisadores, editores e agências reguladoras. Vale destacar que o leitor atento consegue identificar os problemas e as lacunas mais frequentes e fica mais preparado para produzir melhores artigos para futuras submissões

Milk quality parameters associated with the occurrence of veterinary drug residues in bulk tank milk

ABSTRACT Veterinary drug residues in bulk tank milk are important to all sectors of the dairy chain because they are one of the major factors which determine the safety of the final product. This study attempted to identify milk quality parameters that are associated with the occurrence of veterinary drug residues using multivariate principal component analysis (PCA). A total of 132 raw milk samples were collected from 45 dairy farms in the state of Minas Gerais - Brazil and analyzed for 42 analytes, including pyrethroids, macrocyclic lactones and antibacterials, using liquid chromatography coupled with mass spectrometry in tandem mode and gas chromatography with electron capture detection. Out of the 132 milk samples, 40 samples tested positive for at least one analyte (above the detection limit). The milk parameters associated with the antimicrobial residues by confirmatory tests were lactose and nonfat concentrations, as revealed by PCA. This analysis showed that fat and total solid concentrations, as well as the somatic cell and total bacteria counts were associated with macrocyclic lactone residues in bulk tank milk. A PCA assessing pyrethroid residues in bulk tank milk revealed that the lactose and nonfat solid concentrations and titratable acidity were inversely associated with these residues. Thus, the data analysis indicated that the veterinary drug residues were associated with certain milk quality parameters that can be used to target farms at higher risk of veterinary drug residue contamination for testing programs in combination with incentives, education and training programs to improve mammary health, milk hygiene and safety