FOOD. Science. Technology. Quality

Food. SCIENCE. Technology. Quality

Food. Science. TECHNOLOGY. Quality

Food. Science. Technology. QUALITY

Authors

AGATA ZNAMIROWSKA, DOROTA KALICKA, MAGDALENA BUNIOWSKA, PRZEMYSŁAW ROŻEK

Title

Effect of dried apple powder additive on physical-chemical and sensory properties of yoghurt

Abstract

The advantage of dried fibre products is that they are perceived by consumers as natural ingredients in fruits and vegetables. Owing to this positive perception, the dried powdered fruit has become increasingly important as a potential source of fibre for the food industry. The objective of the study was to determine the effect of applying two doses of dried apple powder: 1.5 and 3 % on the total acidity, colour, syneresis, texture, and sensory features of yogurt produced using a thermostatic method. The scope of the research study covered the production of plain yoghurt with dried apple powder added and the assessment of its quality after 7 days of refrigerated storage. The assessed parameters were: pH, total acidity, syneresis, colour parameters (L *, a *, b *), texture with the use of TPA, and sensory features. The dried apple powder additive significantly affected the reduction of syneresis, acidity increase, and yoghurt hardness reduction. Adding dried apple powder in the amount of 1.5 % caused the release of whey to be 4 % reduced while increasing the quantity of dried apple powder added to 3 % caused the syneresis effect to be reduced as much as ca. 6.5 %. Moreover, increasing the amount of dried apple powder added from 1.5 to 3 % significantly increased the intensity of red and yellow colour of the yoghurt. The dried apple powder added caused the yoghurt colour to adversely grow dark but, at the same time, it imparted a distinct apple flavour and aroma to the yoghurt, the ones preferred by consumers. The dried apple powder added caused the intensity of the milky-cream flavour to be reduced and the intensity of the sour taste of yogurt to increase. The dried apple powder did not impart any foreign aroma and foreign flavour to the yoghurt and this additive was perceived by consumers as a natural, fruity flavour. The dried apple powder is a natural fruit product that should be applied to a greater extent in the production of milk-based drinks owing to its high fibre content, optimal sugar content, and very good taste and aroma. This additive fits well into the “clean label” trend in the organic foods segment.

Keywords

yoghurt, dried apple, fibre, sensory features

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