Selected Physical And Functional Properties Of Inulin In Ice Cream

Author : Maria Rolon
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (959 download)

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Download or read book Effect of Fat Content on Physical Properties and Consumer Acceptability of Vanilla Ice Cream written by Maria Rolon and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past few decades, the food industry has been seeking to reduce the energy density of many products. Fat reduction is often pursued as a strategy to decrease the overall caloric content of foods, since it provides the highest amount of energy per gram (9 kcal/g), when compared to proteins and carbohydrates (4 kcal/g). However, fat-reduced products are often perceived to be of inferior sensory quality, when compared to the full-fat alternative.Ice cream is a complex food matrix due to the coexistence of multiple physical phases: ice crystals, air bubbles, partially coalesced fat globules and a concentrated, highly viscous unfrozen solution. In ice cream, removal of one ingredient may affect not only physical properties but also multiple sensory characteristics that are important to consumers. Fat, in particular, contributes to texture, mouthfeel and flavor, in addition to serving as a structural agent supporting the other physical phases, in particular the air bubbles. Moreover, it contributes to the characteristic smoothness, dryness and melting rate of the products. Removal of fat from ice cream without replacement of solids has been shown to decrease sensory quality indicators, while the addition of ingredients to replace the fat has provided better results. However, the perfect replacement strategy has yet to be found. Previous work evaluating fat removal strategies has focused on changes in key sensory descriptors, with surprisingly little information available about consumer acceptability of reduced-fat products.In this study, the effect of replacing fat with maltodextrin (MD) on selected physical properties of ice cream and on consumer acceptability were evaluated simultaneously. Vanilla ice creams were formulated to contain 6, 8, 10, 12 and 14% fat and 8, 6, 4, 2, and 0% maltodextrin, respectively. Physical characterization included measurements of overrun, apparent viscosity, fat particle size, fat destabilization, hardness and melting rate. A series of consumer acceptability tests were conducted, each with ~100 participants, to measure liking and intensity of various sensory attributes. The experiment was replicated three times. Data were analyzed using one-way Analysis of variance (ANOVA) and a mixed model ANOVA for the physical and sensory data, respectively. Correlation analysis was used to assess relationships between consumer acceptability, physical variables and sensory attributes. Consumer tests were also conducted after 19 weeks of storage at -18C, to assess changes in sensory acceptance due to prolonged periods of storage. Later, a discrimination test was used to determine the difference in fat content that consumers are able to discriminate among the products tested in this study. Results indicated that viscosity of the mixes decreased with increasing fat content and decreasing maltodextrin concentration. Fat particle size and fat destabilization significantly decreased with fat reduction. However, consumer acceptability did not significantly differ across the samples for fresh or stored ice cream. Even in the absence of significant differences, overall liking was correlated with slower melting rate in fresh ice cream. Following storage, ice creams with 6, 12 and 14 % fat did not differ in consumer acceptability compared to fresh ice cream. However, ice creams with 8 and 10% fat (and 6 and 4% MD), each showed a significant drop in liking score following storage by 2.8 and 5.7%, respectively. When asked to discriminate, consumers were unable to distinguish ice creams with 2% fat difference when maltodextrin was included in the formulation. A 4% difference was found to be discriminated when comparing 6% vs 10% fat ice creams but not for 8% vs 12% fat. Collectively, the changes in the physical structure of ice creams with fat contents ranging from 6 to 14% did not show evidence of gross changes in consumer acceptability for either fresh or aged ice cream.