The aim of this study was to produce a suitable cake with reduced fat with the help of apple pomace fiber as a fat substitute. After preparing fiber from apple pomace by water extraction method, first some properties of this fiber were evaluated. Due to the low amount of fat and energy and the amount of crude fiber, the extracted apple fiber was able to replace carbohydrate-based fat for flour products. In this study, optimization of the cake production process by three factors, including apple fiber with a ratio of (0.5, 10%) and oil (16.38, 15.47, 14.57%) with a shelf life of 0, 15 and 30 days. Response method was performed. The result showed that with increasing the amount of fiber moisture, fat, firmness and adhesion, the springiness of the cakes increased and the volume decreased. With increasing shelf life, moisture, fat, aw increased and the firmness and stickiness of cake spring decreased. The results of this study show that the cake containing 5.163% fiber and 14.9% oil in 8 days was the best sample. The results showed that the use of apple pomace in the cake reduced the fat content by 9.3% compared to the control sample. According to the optimization results, the optimum sample moisture content is 22.847%, water activity 0.850%, fat 15.018%, specific gravity 82.737 cm3/g, hardness 10809 (N), spring content 0.747 cm and the amount of adhesion was determined to be 0.392.
The current study is aimed to compare the effect of fat and/or wheat-flour substitution with apple pomace on the physicochemical and shelf-life of oily cakes. The sensory quality of samples was evaluated using the Delphi-Fuzzy logic method. The oily-cakes include the following: TCO: control; T W 10 % and T W 20 % : flour substitution with apple pomace (10 and 20% w/w); TO10% and TO20%: fat substitution with apple pomace (10 and 20% w/w); T W & O 5 : 5 and T W & O 10 : 10 : fat and wheat-flour substitution with apple pomace (5 : 5 and 10 : 10% w/w). The lowest and highest protein content were recorded for T w 20 % (10.0 ± 0.12%) and TO20% (11.0 ± 0.45%) ( p < 0.05 ). There was no significant difference between the fat content of control samples with T W 10 % , T W 20 % , and T O & W 5 : 5 ( p > 0.05 ). T W 20 % exhibited the highest fiber content (2.12%) and the lowest caloric (385.0 kcal/100 g) values. There was a significant difference between baking loss of TO10% (9.87%) and TO20% (9.36%) samples with control one (11.6%) ( p < 0.05 ). By reducing the fat content, smaller and lower porous was observed. The antioxidant and antimicrobial potential of apple pomace was not significant. Therefore, apple pomace had no significant effect on the shelf-life of cakes. Based on defuzzification values, the sensory ranking of samples was as follows: T C O 64.4 > T W 20 % 63.9 > T W & O 5 : 5 63.7 > T W 10 % 63.6 > T O 10 % 60.2 > T W & O 10 : 10 60.1 > T O 20 % 58.8 . Overall, apple pomace could be considered a cost-effective, sustainable, and healthy alternative to partial wheat-flour. Further research is required to produce reduced-fat cakes. Adding fruit powder along with fat replacers can be suggested for future studies.
The tasty yogurt is dairy formulation for which fruits and vegetables and various extracts are used in preparation process. In the present study, Ginger extract (Zingiber Officinale) was used in yogurt formulation in different quantities (2, 4, 6 and 8%) and inhibitory function of free radicals, phenol compounds as well as qualitative tests of product (pH, acidity, watering amount and viscosity) were evaluated after storing yogurt for 1, 10 and 20 days. The results illustrated that ginger extract caused water-soluble phenol compounds and their antioxidant function to become more than in simple yogurt during 10 days storage so that after 10 days the highest antioxidant activity belonged to yogurt including 6 and 8% of ginger extract. The lowest watering amount (water formation) was observed in yogurt including 8% ginger extract and it significantly differed from other samples (P>0.05). The pH loss increased further in yogurt with rising percentage of extract and also increasing storage period. Moreover, adding ginger extract to yogurt reduced viscosity, but there was no significant impact on acidity level of product during storage time (P<0.05).
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