焦磷酸钠与谷氨酰胺转氨酶对氧化损伤肌原纤维蛋白凝胶性能的协同改善效应

doi:10.3864/j.issn.0578-1752.2021.16.014

摘要/Abstract

摘要：

【目的】探究焦磷酸钠（sodium pyrophosphate,PP）、谷氨酰胺转氨酶（transglutaminase,TG）及其组合（PP+TG）对氧化损伤猪肉肌原纤维蛋白（myofibrillar protein,MP）凝胶性能的影响,为改善氧化损伤蛋白的功能特性提供理论依据。【方法】从猪背最长肌中提取MP,采用亚油酸-脂肪氧合酶氧化体系诱导MP发生氧化,然后分别添加PP（1 mmol∙L^-1）、TG（E﹕S=1﹕500）及其组合（PP+TG）。采用圆二色谱探究不同添加处理对氧化损伤MP溶液二级结构的影响;通过内源性色氨酸荧光测定探究MP三级结构的变化;通过粒度、溶解度及SDS-PAGE探究不同处理对MP交联聚集情况的影响;借助物性测试仪探究MP凝胶强度的变化;采用离心法测定凝胶持水性的变化;通过分光测色计测定其白度变化;借助扫描电镜观察MP凝胶的微观结构。【结果】PP处理明显改变了氧化损伤MP的构象,使氧化MP的平均粒径明显减小、溶解度显著增强,在增强凝胶强度的同时显著提高了其持水性能（P<0.05）,凝胶的微观结构也明显比氧化损伤MP凝胶更规则、均匀、细腻和致密。TG处理显著改善了MP凝胶强度,但对其持水性能并无积极影响;凝胶的微观结构孔径变小、结构致密的同时,仍存在形状不规则、表面粗糙等问题。综合来看,PP+TG协同使用效果最好,氧化损伤MP的凝胶强度及持水性显著增强,且明显好于未氧化MP的凝胶性能。【结论】焦磷酸钠与谷氨酰胺转氨酶的协同使用可以有效改善氧化损伤MP的凝胶性能。

关键词: 肌原纤维蛋白, 焦磷酸钠, 谷氨酰胺转氨酶, 氧化, 凝胶性能

Abstract:

【Objective】 This study was designed to explore the effects of sodium pyrophosphate (PP), transglutaminase (TG), and their combination (PP+TG) on the gelling properties of oxidatively damaged pork myofibrillar protein (MP), which was expected to provide a theoretical basis for the enhancement of functional properties of oxidatively damaged proteins. 【Method】 MP was extracted from porcine longissimus lumborum muscle, and oxidized using a lipoxygenase-linoleic acid oxidation system. Subsequently, PP (1 mmol∙L^-1), TG (E:S=1:500) and their combination (PP+TG) were added and incorporated into the oxidatively damaged MP systems, respectively. The effects of different additive treatments on the secondary and tertiary structures of oxidatively damaged MP solution were investigated by circular dichroism spectroscopy and endogenous tryptophan fluorescence, respectively. The changes of cross-linking and aggregation of MP with different treatments were investigated through measuring particle size, solubility and SDS-PAGE. The textural properties of MP gels were measured by physical property tester, and the water holding capacity (WHC) was determined by centrifugation method. The whiteness of the MP gels was measured by spectrophotometer, and the microstructure of the MP gels was observed by a scanning electron microscopy. 【Result】 The results showed that PP treatment significantly changed the protein conformation, reduced the mean particle size and enhanced the solubility of oxidatively damaged MP, and obviously enhanced the gel strength and water holding capacity (P <0.05). The microstructure of gel with PP treatment was more regular, uniform and delicate than that of oxidatively damaged MP gel. TG treatment significantly improved the gel strength, but had no positive effect on the water holding capacity. While the MP gel with TG treatment had a compact microstructure with small pores, there were still irregular shape and rough surface. On the whole, the combination of PP and TG had the best synergistic effect. The gel strength and water holding capacity of oxidatively damaged MP under PP+TG treatment were significantly enhanced, and the gel performance was obviously better than that of non-oxidized MP. 【Conclusion】 The combination of PP and TG could effectively improve the gelling properties of oxidatively damaged MP.

Key words: myofibrillar protein, sodium pyrophosphate, transglutaminase, oxidation, gelling properties

李保玲,李颖,范鑫,马文慧,曹云刚. 焦磷酸钠与谷氨酰胺转氨酶对氧化损伤肌原纤维蛋白凝胶性能的协同改善效应[J]. 中国农业科学, 2021, 54(16): 3527-3536.

LI BaoLing,LI Ying,FAN Xin,MA WenHui,CAO YunGang. Synergistic Enhancement of Gelling Properties of Oxidatively Damaged Myofibrillar Protein by Sodium Pyrophosphate and Transglutaminase[J]. Scientia Agricultura Sinica, 2021, 54(16): 3527-3536.

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