中文摘要：

在确定大黄鱼肌肉蛋白质双向电泳分离的基础上，采用荧光素-5-氨基硫脲（fluorescein-5-thiosemicarbazide，FTSC）对氧化的大黄鱼肌肉蛋白质进行荧光标记和参数优化，进而建立氧化肌肉蛋白质的双向电泳技术体系。结果显示，氧化肌肉蛋白质较佳的双向电泳程序为：蛋白样品采用液氮研磨和裂解液Ⅲ（含8mol/L尿素、2mol/L硫脲、4%3-（3-（胆酰胺丙基）二甲氨基）丙磺酸内盐（CHAPS）、65mmol/L二硫苏糖醇（DTT）和0.2%载体两性电解质）制备；采用FTSC溶液40℃恒温水浴3h，对氧化蛋白质进行荧光标记，并采用乙醇-乙酸乙酯混合溶液进行洗脱；标记后的蛋白样品采用pH5～8的固定化pH梯度（IPG）预制胶条上样后，采用等电聚焦程序C（50V主动水化14h，500V、2h，1000V、1.5h及4000V、1h三段式除盐，6000V、0.5h和10000V、1h两段式升压，10000V聚焦80000vhr，最后500V保持10h）进行第1向分离，再采用12%的聚丙烯酰胺分离胶进行第2向分离；最后所得凝胶经直接荧光扫描和银染后扫描分别得到氧化肌肉蛋白质的荧光图谱和肌肉全蛋白电泳图谱。由该程序获得的双向电泳图谱具有分离度好、蛋白点清晰、分布均匀等优点，为利用双向电泳和蛋白质组学技术分离鉴定氧化蛋白质种类、进而阐明蛋白质氧化机制提供理论依据。

英文摘要：

The purpose of this study was to optimize the processing parameter for fluorescence labeling of oxidized muscleproteins from large yellow croaker(Pseudosciaena crocea)with luorescein-5-thiosemicarbazide(FTSC),and further toestablish a two-dimensional gel electrophoresis(2-DE)system for oxidized muscle proteins.The results showed that theoptimized electrophoresis process was as follow.The protein sample was prepared by liquid nitrogen milling and using alysis buffer containing8mol/L urea,2mol/L thiourea,4%CHAPS,65mmol/L DTT and0.2%carrier ampholyte,and thenthe oxidized protein was labeled with FTSC(20mmol/L in DMSO)for3h at40℃in the dark,and washed five times withethanol/ethyl acetate(1:1).The sample was loaded onto immobilized pH gradient(IPG)gel strip(pH5–8),and separatedby isoelectric focusing(active rehydration for14h at50V;desalting for2h at500V,1.5h at1000V and1h at4000V;voltage for0.5h at6000V at first and then for1h at10000V;focusing for80000vhr at10000V;finally balancing for10h at500V).After isoelectric focusing,the IPG strip was transferred and the proteins were separated by12%SDS-PAGE.Finally,2-DE maps for the oxidized and whole muscle proteins with high resolution and even distribution were obtained bydirect scanning using a fluorescence image scanner and scanning after silver staining.This study would provide a foundation for the separation and identification of oxidized muscle proteins,and further for the clarification of protein oxidationmechanism by two-dimensional gel electrophoresis and proteomics technology.