Abstract
ABSTRACT The objective of this work was to evaluate the use of galactomannan from Caesalpinia pulcherrima as a binding agent for the restructuring of fishes. The effect of a frozen (-18 °C) storage of 120 days on the physical-chemical and mechanical properties of fishes was evaluated, restructured fish products with transglutaminase were used as a control. Two fish restructuring formulations were developed: Galactomannan, with 0.2% galactomannan and 1.8% refined salt; and Control, with 0.5% transglutaminase. The analyses were carried out after 24 hours of refrigerated storage (4 °C), corresponding to time zero, and after 30, 60, 90, and 120 days of frozen (-18 °C) storage. The use of galactomannan resulted in a higher pH, and lower total volatile basic nitrogen (TVB-N) and thiobarbituric acid reactive substances (TBARS), with no differences from zero to 120-day storage times for the L*, a*, and b* coordinates. Galactomannan easily bounds to hydrogen, enabling the obtaining restructured fish products with lower expressible water content and less weight losses by cooking, important characteristics for the acceptance of products that denote softness and succulence. Contrastingly, this easy bound to water molecules resulted in a lower hardness, cohesiveness, and elasticity, and higher adhesivity when compared to the control. The results showed the viability of using galactomannan to restructure fishes during frozen storage.
Highlights
Caesalpinia pulcherrima, known in Brazil as maravilha, flamboyanzinho, or flor-do-paraíso, is an ornamental plant of the family Leguminosae that presents dehiscent and polyspermic fruits with, on average, seven oblong-oval shape seeds (ARAÚJO NETO et al, 2014)
The objective of this study was to evaluate the effect of frozen storage (-18 °C) for 120 days on physical-chemical and mechanical properties of restructured fish (Oligoplites palometa) products prepared with galactomannan from Caesalpinia pulcherrima, using a commercial binding agent with transglutaminase as a control to compare the binder action of galactomannan
Restructured fish (Oligoplites palometa) products with galactomannan stored under freeze presented the lowest total volatile basic nitrogen (TVB-N) and thiobarbituric acid reactive substances (TBARS)
Summary
Caesalpinia pulcherrima, known in Brazil as maravilha, flamboyanzinho, or flor-do-paraíso, is an ornamental plant of the family Leguminosae that presents dehiscent and polyspermic fruits with, on average, seven oblong-oval shape seeds (ARAÚJO NETO et al, 2014). The endosperm of these seeds contain galactomannan, which is a reserve polysaccharide and, chemically, a linear chain of mannose united by glycosides β (1-4) bindings, which are associated to residues of galactose by type α (1-6) clusters as substitutes in the carbon 6 of D-mannose (CERQUEIRA et al, 2011). Maia et al (2015) developed nuggets and fish-burgers of tilapia surimi using it as a thickener and evaluated the chemical composition of the products; they found that the addition of this polysaccharide did not affect the products, which presented good acceptance by consumers and high grades in the sensorial analysis done by untrained tasters
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