阳离子种类和添加量对鲢鱼糜 凝胶力学特性的影响

Effects of types and concentration of cations on surimi gels texture properties

中文关键词:  鱼糜  力学特性  一价金属离子  二价金属离子

英文关键词:surimi  texture properties  monovalent cations  divalent cations

中文摘要:

      目的 比较一价金属离子和二价金属离子对鲢鱼糜凝胶力学性能的影响。方法 向加入2.5%NaCl的鱼糜中添加不同浓度的KCl 、CaCl2、MgCl2(0、10、20、30、40、50 mmol/kg)、ZnCl2(0、0.02、0.04、0.06、0.08、0.10 mmol/kg), 研究金属离子对鱼糜凝胶穿刺和TPA性能的影响, 并通过蠕变参数的变化研究金属离子与大分子的相互作用。结果 10~30 mmol/kg一价金属离子盐KCl对鱼糜凝胶品质影响较小, 二价金属离子盐(MgCl2、CaCl2、ZnCl2)能够显著提高鱼糜凝胶的破断强度、凹陷深度、松弛时间和黏流指数。综合持水性、白度和力学特性, MgCl2、CaCl2 和ZnCl2 的最适浓度分别为40~50 mmol/kg、20~30 mmol/kg和0.06~0.08 mmol/kg。结论 二价金属离子(Mg2 、Ca2 、Zn2 )能够促进蛋白质伸展, 并与蛋白质侧链-COOH形成“盐桥”, 同时Ca2 还能激活内源性转谷氨酰胺酶(TGase)活性, 促进ε-(γ-Glu) – Lys的形成, 提高鱼糜凝胶力学性能, 而一价金属离子K 会显著提高鱼糜凝胶的持水性。

英文摘要:

      Objective In order to investigate effects of monovalent and divalent cations on surimi gels texture properties from silver carp. Methods Puncture and TPA properties of surimi gels added with KCl, CaCl2, MgCl2(0, 10, 20, 30, 40, and 50 mmol/kg), ZnCl2(0, 0.02, 0.04, 0.06, 0.08, and 0.10 mmol/kg)were studied. Creep test was also conducted to study the cross-linking between metal ions and macromolecule. Results 10~30 mmol/kg monovalent cation salt (KCl) had little effects on surimi gels. However, divalent cations salts (MgCl2, CaCl2, ZnCl2) could significantly increase breaking force, deformation, relaxation time and viscosity coefficient of surimi gels. Taking water-holding capacity, whiteness and texture properties into consideration, the optimal concentration of MgCl2, CaCl2 and ZnCl2 was 40~50 mmol/kg, 20~30 mmol/kg and 0.06~0.08 mmol/kg, respectively. Conclusion Divalent cations could increase texture properties of surimi gels by inducing protein unfolding and cross-linking via salt bridge. And Ca2 could activate endogenous transglutaminase and catalyzed the formation of ε-(γ-Glu)-Lys. Monovalent significantly improved the water-holding capacity of surimi gels.