Efeito da adição de extrato de casca de jabuticaba nas características físico-químicas e sensoriais de queijo petit suisse

• Autor(a) principal: Saito, Tiemi
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/1258
• topic: Bioactive compounds; Natural colorant; Petit suisse cheese; Prebiotics; Corantes naturais; Ciência e Tecnologia de Alimentos; Compostos bioativos; Queijo; Jabuticaba; Prebióticos; 664

The quest for improved quality of life and the search for natural and functional foods are growing. The incorporation of prebiotics and natural colorant can add value to the product, being able to improve their quality and have great technological attractions. Therefore, the aim of this work was to evaluate the effect of adding of prebiotics (inulin and oligofructose) and natural colorant (jabuticaba peel extract) on the characteristics of petit suisse cheese. Analysis of physical and chemical composition (total solids, ashes, proteins, lipids, carbohydrates and titratable acidity) were performed immediately after processing, pH, colorimetry, content of bioactive compounds and antioxidant activity were measured in different storage times (0, 7, 14, 21 and 28 days), analysis of the dietary fiber content of the formulation of petit suisse cheese with higher antioxidant activity at the end of shelf life and microbiological and sensory analysis. The petit suisse cheese was divided into five formulations, according to the concentration of natural colorant, which were 0%, 1.5%, 2.0%, 2.5% and 3.0%. The data obtained from the analysis performed immediately after processing and sensory analysis were subjected to analysis of variance and Tukey test, the data obtained from analysis performed at different storage times were submitted to variance analysis and kinetic behavior study, and fiber analysis and microbiological was analyzed using descriptive statistics. The analysis of total solids, proteins, lipids, carbohydrates and ashes did not differ significantly (p>0.05) between the formulations. The formulation without the addition of natural colorant showed the lowest acidity (p=0.05), and the increase of natural colorant content made the acidity of the cheese higher. The levels of anthocyanins, phenolics and antioxidant activity were greater with the increase of the concentration of incorporated colorant, and the anthocyanin content decreased with the passage of storage time. The data concerning fiber in the formulation containing 3.0% of natural colorant was low, showing no functional property allegation to this product. In order to verify if the cheese could be consumed a microbiological analysis for coliform was previously performed and all formulations of petit suisse cheese were in satisfactory sanitary conditions. Sensory analysis was conducted in two stages. On the first stage an acceptance test was performed, with evaluation of color, flavor, consistency and overall impression attributes, as well as purchase intent for each formulation. In the second stage the acceptance test was performed, adding nutritional information to the product which was the most accepted in the first stage. As a result, it was observed that the color attribute was the only one that showed a significant difference between the formulations (p=0.05), the most accepted were the ones with concentrations 2.5% and 3.0%. In general, all formulations were well accepted, however, the formulation with the highest addition of natural colorant showed the highest grades. Thus, the cheese with the highest concentration of natural colorant was used in the second sensory stage and the influence of color and consistency attributes information was observed (p=0.05). Therefore, the use of prebiotics and natural colorant on petit suisse cheese was viable, since the basic characteristics of the product were not changed, and it gave the product an attractive color.