SENSORY PROPERTIES AND STABILITY OF SELECTED FREEZE-DRIED NIGERIAN SOUPS STORED AT AMBIENT CONDITION
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Date
2018-06-07
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Nigerian institude of food science and technology
Abstract
African traditional soups are rich in nutrients, but their preservation by reheating after use and frozen storage reduce their nutrient qualities. Freeze drying
perfectly retains food nutrients and sensory properties, but literature is sparse on its application to Nigerian soups preservation. Soups (Ila, Ewedu, Ogbono
and Kuka) were prepared using standard recipes, freeze-dried, packaged in polyvinylchloride and stored at ambient condition for 8 weeks. Moisture, free fatty
acid (FFA), peroxide value (PV), pH value, titratable acidity (TTA), viscosity, microbial counts and sensory attributes of the samples were determined at 14
days interval using standard methods. The Moisture, FFA, PV, pH, TTA and viscosity of the soups ranged from 6.33% to7.57%, 0.66 % to 1.93%, 5.94 % to
8.69%, 6.87 % to 7.10 %, 0.07 to 0.31 and 0.88 to 1.98Pa.s respectively. The ambient storage period had significant influence on the sensory attributes and
stability indices of the freeze-dried soups. Freeze-drying reduced soups moisture contents by 90.0-90.8% and a profound increase was not noticed during
storage. Bacterial counts of freeze-dried soups ranged from 0.0 cfu/g-5.3 cfu/g. Freeze drying drastically reduced their initial microbial loads and limited their
proliferation during storage. Freeze dried soups stability cannot be guaranteed after two months storage, because of continuous increase in the PV and FFA
values, which affect soup tastes and overall acceptability.
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Citation
3. Raji, A. O., Akinoso, R., Sani, M and Raji, M. O. (2018). Sensory Properties and Stability of Selected freeze-dried Nigerian Soups Stored at Ambient condition. Applied Tropical Agriculture journal. 24(1) pp.191-193