Development of stirred type fruit yoghurt using wood apple (Limonia acidissima)
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Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
Uva Wellassa University of Sri Lanka
Abstract
Consumption of fruits and milk is important for human health as they are good sources of
protein, vitamins and minerals (Alakali et al., 2008). Fruit yoghurts have been popular among
milk products in the world. But, it is not very common in Sri Lankan market. In manufacturing
fruit yoghurts, fruit is usually added to milk product in the form of fruit preparations or as fruit
flavors. But, manufacturing fruit yoghurts, with natural fruit pulp or juice is very important to
provide nutritional and natural balance diet. Yoghurt has nutritional benefits beyond those of
milk. Lactose-intolerant individuals can sometimes tolerate yoghurt better than other dairy
products, because the lactose in the milk is converted to glucose and galactose, and partially
fermented to lactic acid, by the bacterial culture. When, underutilize fruits are concerned, wood
apple is one of fruit which is cheap, highly nutritious, perishable and seasonally available fruit in
Sri Lanka (Vidhyaasree, 2012). Therefore, this research was carried out to develop a stirred type
wood apple yoghurt as a nutritional dessert as well as a balance diet.
Materials and Methods
Current study was carried out at Food Research Unit, Department of Agriculture, in Gannoruwa,
Peradeniya. Laboratory analysis was conducted at Uva Wellassa University, Food Research
Unit, Veterinary Research Institute and chemical laboratory in SGS Lanka (Pvt.) Ltd. A series of
preliminary trials conducted to find out the best product for further evaluations and
development. First preliminary trial was carried out to preparation of main ingredients. Under
that, plain yoghurt preparation, wood apple pulp preparation and sugar and fresh milk addition
were undertaken. Second preliminary trial was carried out to adjust the pH value, brix value of
the product and texture, mouth feel and taste of the product. The third preliminary trial was
carried out to create four different recipes. Mainly four different wood apple pulp amounts (5,
7.5, 10 and 12.5%) were added to prepare four different recipes. Sensory evaluation was
conducted for colour, taste, odour, mouth feel and overall acceptability using 50 semi-trained
panelists. In physicochemical analysis, pH, titratable acidity, total soluble solids, total fat, solid
non fat, proximate analysis, calcium and phosphorus contents and microbial analysis yeast,
SLSI
recommended levels. Shelf life analysis was conducted by analyzing some physicochemical,
,
15 and 20 days of storage. Finally, cost of final product was analyzed. Sensory data were
analyzed using computer aided MINITAB 14 statistical analysis package Friedman non-
parametric test and physicochemical and microbial tests were analyzed using one way ANOVA
at 95% level of significant.
Description
Keywords
Agriculture, Export Agriculture, Fruit Cultivation, Food Technology, Food Science, Beverage Industry