Abstract
Storage properties of fish and rice flour coextrudates like sorption isotherm, vitamin A, and total tocopherols and gain in peroxides and free fatty acid were investigated at 30 °C storage temperature. The sensory attributes were also evaluated on a nine-point hedonic scale. Sorption isotherm indicated that the critical a w levels for extrudates can be in between 0.4 and 0.7. The monolayer moisture content based on Guggenheim–Anderson–de Boer model was found to be 0.058 g/g (dry basis). During the first 15 days of storage, a loss of 53.1% and 50% of vitamin A (IU/g) and total tocopherols (%) was observed, respectively. The peroxide and free fatty content increased from 46 to 109 mg/kg and 3.8% to 7.7%, respectively, during the same period. Nonlinear model \({X \mathord{\left/ {\vphantom {X {X_0 }}} \right. \kern-\nulldelimiterspace} {X_0 }} = \exp \left( { - k \times t^n } \right)\) described the best for the loss of vitamin A and tocopherols and gain in peroxide values and free fatty acid content with respect to storage period. The loss of vitamin A and total tocopherols almost followed a similar trend during the complete storage period of 45 days. The gain in peroxides was more prominent compared to free fatty acid content during the initial 15 days of storage. The k (rate constant) value of vitamin A and peroxide value is higher compared to total tocopherols and free fatty acid content. The ANOVA table indicated that the sensory attributes of the product fried for different times (15–120 s) were significantly different, and the product fried for 15 s was most acceptable.
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Abbreviations
- %:
-
Percent
- a w :
-
Water activity
- C and K:
-
GAB constants
- F :
-
Free fatty acid at time t (days)
- F 0 :
-
Initial free fatty acid
- IU:
-
International Unit
- k :
-
Rate constant (unit/day)
- kg:
-
Kilograms
- m :
-
Equilibrium moisture content (%)
- M 0 :
-
Monolayer moisture content
- mg:
-
Milligram
- P :
-
Peroxides after time t (days)
- p :
-
Statistical significance
- P 0 :
-
Initial peroxides
- s:
-
Seconds
- t :
-
time in days
- T :
-
Total tocopherols after time t (days)
- T 0 :
-
Initial total tocopherols
- V :
-
Vitamin A at time t in days
- V 0 :
-
Initial vitamin A
- X :
-
Quality after certain time t (days)
- ANOVA:
-
Analysis of variance
- X 0 :
-
Initial quality
- db:
-
dry basis
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An erratum to this article can be found at http://dx.doi.org/10.1007/s11947-010-0480-8
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Shankar, T.J., Sokhansanj, S., Bandyopadhyay, S. et al. Storage Properties of Low Fat Fish and Rice Flour Coextrudates. Food Bioprocess Technol 3, 481–490 (2010). https://doi.org/10.1007/s11947-008-0170-y
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DOI: https://doi.org/10.1007/s11947-008-0170-y