Andresa Carla Feihrmann

Dyeing of polyethylene terephthalate fibers with a disperse dye in supercritical carbon dioxide

A 24 factorial design of experiments complemented with a central point was performed to examine the influence of operating factors on color strength and color fastness of polyethylene terephthalate (PET) fibers dyed with the Disperse Orange 30 dye in supercritical CO2. The effects of temperature, pressure, dyeing time and mass ratio between the dye and PET introduced in the dyeing chamber (α ratio) were considered. An additional set of kinetic results of color strength was obtained at the optimum condition in terms of pressure at the already presented temperatures and α ratios. A significant statistical effect of all the investigated factors on the color was observed, but except for the temperature, the influence of the same variables on wash fastness was negligible (p < 0.05). The color results expressed in terms of K/S from 2.4 to 21.8 revealed that the use of supercritical CO2 as a solvent for the dye is a rapid and reliable alternative procedure for dyeing of PET fibers with the Disperse Orange 30 dye. The results of wash fastness currently obtained (i.e. 4.69 ± 0.18) support the use of ScCO2.

Shelf life of meat from Boer-Saanen goats fed diets supplemented with vitamin E

This work aims at evaluating shelf life of meat from Boer-Saanen cross goats fed on diets containing vitamin E. Thirty-five feedlot-fed goats with an initial body weight of 21.6±2.8kg were subjected to four treatments in a completely randomized design: a control treatment with vitamin E plus others containing 50, 150, and 450mg dl-α-tocopherol acetate/kg DM. Longissimus lumborum (LL) muscle samples were stored at temperatures between 4 and 6°C during 15days, and evaluated for lipid peroxidation using the thiobarbituric acid reactive substances (TBARS) method and for visual acceptance by consumers by different survival analysis techniques. The addition, vitamin E in diets influenced shelf life of LL muscle, indicating longer meat preservation as the levels of the vitamin in diet increased, as the results obtained in chemical and subjective visual assessments showed. TBARS analysis showed to be more accurate in predicting shelf life of meat than subjective visual assessment by consumers, which reached a saturation threshold of 2mg malonaldehyde/kg of meat earlier at all tested levels of vitamin E inclusion.

Tecnologia de produção em kafta de carne de ovelhas suplementadas com grão de linhaça

Sixteen sheep was used at the end of reproductive life, divided into two groups of eight animals fed for 60 days with complete ration containing zero or 10% linseed. After the slaughter the legs were deboned and used in kafta processing. Chemical and sensory analyzes were conducted to evaluate consumer acceptance. There was no difference (P>0.05) for moisture (70.49%) and mineral matter (1.28%). The crude protein and total lipids had higher averages for kaftas made with meat from sheep supplemented with linseed. The evaluations demonstrated that this product was accepted by 79.6% of the panelists, and 88.9% of men and 81.2% of women who participated in the sensory panel buy the product. Kaftas has a viable production and nutritional quality, and well accepted by consumers of both genders and age. Kaftas from ewe meat, supplemented with linseed had the highest acceptance, showing positive effect on sensory analysis, which suggests the use of grain to differentiate the product.