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Fillet analogues from plasticating extruder restructured fish tissue
Abstract
A process was developed for converting small sized, underutilized fish particles into fillet analogues. Comparisons were made between the physical properties of natural and analogue fish fillets (e.g. shear stress, compression stress, cooking loss, oil uptake, etc.). An image analysis was carried out to compare muscle fiber sizes and distributions of natural fish fillets and fish fillet analogues. A plasticating extruder was used to restructure the small sized fish particles into continuous extrudates which were then used to fabricate fish fillet analogues. The extrudates contained 60% w.b. moisture and various levels of CMC and Xanthan. A cooled die extension was designed and built for use with the extruder to prevent puffing and moisture loss when extrudates emerged from the die opening. The output product obtained was an extrudate that retained its structure when rehydrated to 80% w.b. in warm water and whose textural properties had distinct similarities to those of natural fish muscle. Statistical comparisons showed that there were no differences (P $<$ 0.01) between corresponding physical properties of fish fillet analogues and natural fish fillets. Structural analyses of natural fish fillets and fish fillet analogues revealed less binding between the fibers in fish fillet analogues than in natural fish fillets. Image analyses showed that the diameters of muscle fibers of fish fillet analogues was quite similar to those of natural fish fillets. The texture of the fish fillet analogues produced was much like Atlantic cod fish fingers after cooking. Tests showed that the product was easily severed with the edge of a fork. When the analogues were chewed, they were much like intact cod fish muscle.
Subject Area
Agricultural engineering
Recommended Citation
Chen, Xingjun, "Fillet analogues from plasticating extruder restructured fish tissue" (1993). Doctoral Dissertations Available from Proquest. AAI9408261.
https://scholarworks.umass.edu/dissertations/AAI9408261