To successfully substitute sucrose for sweeteners, further studies must be carried out based on previous knowledge of sweetener concentration to determine the equivalent sweetness of such compounds. In this work, sweetness equivalence of strawberry-flavored yogurt with different sweeteners and/or their combinations (aspartame, acesulfame-K, cyclamate, saccharin, stevia and sucralose) and yogurt sweetened with 11.5% w/w sucrose was measured using the sensory magnitude estimation method. The sweetness concentrations equivalent to strawberry yogurt sweetened with 11.5% w/w sucrose in the tested sweeteners were 0.072% w/w for aspartame, 0.042% w/w for aspartame/acesulfame-K (2:1), 0.064% w/w for cyclamate/saccharin, 0.043% w/w for cyclamate/saccharin (2:1)/stevia (1.8:1) and 0.30% w/w for sucralose. These results can promote the use of different sweetener combinations in strawberry-flavored yogurt, specially acesulfame-K and stevia, once they produce more pleasing in this product. PRACTICAL APPLICATIONSThis study provides some useful information, since there is no data in the literature about sweetness equivalence of sweeteners in yogurt, but only in simpler matrices such as pure water, juices, coffee and teas. The use of stevia blend presented several advantages such as increased sweetening power, demonstrating the potential of this natural sweetener. The magnitude estimation method has been successful in this study, being an important tool for development of new low-calorie products. It may be noted that when evaluating different types of food using the same kinds of sweeteners, these promote distinct characteristics and that reflect directly on the sensory quality of the final product. Thus, such studies generate important information for the food industries working with dietetic food.

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It is important to understand how changes in the product formulation can modify its characteristics. Thus, the objective of this study was to investigate the effect of whey protein concentrate (WPC) on the texture of fat-free dairy desserts. The correlation between instrumental and sensory measurements was also investigated. Four formulations were prepared with different WPC concentrations (0, 1.5, 3.0, and 4.5 wt. (%)) and were evaluated using the texture profile analysis (TPA) and rheology. Thickness was evaluated by nine trained panelists. Formulations containing WPC showed higher firmness, elasticity, chewiness, and gumminess and clearly differed from the control as indicated by principal component analysis (PCA). Flow behavior was characterized as time-dependent and pseudoplastic. Formulation with 4.5% WPC at 10 °C showed the highest thixotropic behavior. Experimental data were fitted to Herschel-Bulkley model. The addition of WPC contributed to the texture of the fat-free dairy dessert. The yield stress, apparent viscosity, and perceived thickness in the dairy desserts increased with WPC concentration. The presence of WPC promotes the formation of a stronger gel structure as a result of protein-protein interactions. The correlation between instrumental parameters and thickness provided practical results for food industries.

Yogurt market research in the city of Belo Horizonte, BrazilThe study of consumers´ profile and the factors involved in the moment of purchasing yogurt is an important tool for identifying different market segments and their potentialities. Therefore, the aim of this study was to interview 387 yogurt consumers residing in the city of Belo Horizonte -MG, Brazil, using structured questionnaires. The results were analyzed in a descriptive way. Pearson´s correlation was applied in order to verify the correlation between sociodemographic characteristics and the consumers´ profile. The results indicated that strawberry flavored yogurt shows the greatest acceptance among consumers and the category of light/diet represents a great part of the consumers' preferences (54%). According to the survey, 39,9% of the respondents that do not consume light/diet yogurts stated that they do not appreciate these products. These results shows the importance of carrying out research to develop light/diet yogurt with improved sensorial quality. One of the main reasons pointed out for consumers not to eat light/ diet yogurt is that they do not see the need for consuming it. In the city the research took place, quality, brand and price Recebido para publicação em maio de

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