CN111141908A - 乙肝病毒表面抗原试剂盒及测定方法 - Google Patents
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Abstract
本发明公开了一种乙肝病毒表面抗原试剂盒及测定方法,属于免疫分析技术领域,在乙肝表面抗原酶联免疫吸附法试剂中,偶联酶和微孔载体的单克隆抗体采用鸡抗人单克隆IgG抗体,稀释液为生理盐水中加入葡萄球菌A蛋白,葡萄球菌A蛋白结合免疫球蛋白IgG分子中Fc段,而不与鸡抗体球蛋白结合,采用双抗体夹心法进行检测,葡萄球菌A蛋白不干扰检测试剂中的抗体,能消除血清中异常球蛋白的干扰。
Description
技术领域
本发明属于免疫分析技术领域;或是利用可见光,通过测试反应的结果产生颜色变化来测试材料的方法,特别是涉及一种乙肝病毒表面抗原试剂盒及测定方法。
背景技术
乙肝病毒表面抗原是乙肝血清学5项检查中的第一项,其英文缩写是“HBsAg”,检测乙肝的抗原有许多方法,如:放射免疫法、酶联免疫法、微粒子化学发光法、时间分辨免疫荧光法、微粒子酶免检测法、电化学发光法等,用不同的试剂检测,检测结果的数值各不相同,这些检测HBsAg的方法都可归为“定性”、“半定量”和“定量”三类。
乙肝病毒表面抗原测定原理为单克隆抗体(抗-HBS)吸附固相微孔载体表面,与血清中HBSAg结合,加入酶标记的抗-HBS则形成新的复合物,酶促反应对加入的底物产生颜色,酶标仪可以测出OD值,与阴阳性孔产生深浅对照判为阴性或阳性,OD值分析:P(样品)、N(空白或阴性),
P/N=待检样品OD-本底OD/阴性对照OD-本底OD
P/N≧2.1为阳性。
在检测试剂中,偶联酶和微孔载体的单克隆抗体多为羊抗人IgG抗体,在测定多发性骨髓瘤患者时,血清中免疫球蛋白IgG、IgA异常升高,或者单克隆轻链明显的升高,或在肾衰患者时,由于血液中异常蛋白的升高,造成非特异反应增强,结果干扰大,甚至与临床不符。
发明内容
本发明目的是提供一种消除血清中内源性免疫球蛋白干扰,灵敏度高,特异性强的乙肝病毒表面抗原试剂盒及测定方法。
采用的技术方案是:在乙肝表面抗原酶联免疫吸附法试剂中,偶联酶和微孔载体的单克隆抗体采用鸡抗人单克隆IgG抗体,稀释液为生理盐水中加入葡萄球菌A蛋白,葡萄球菌A蛋白结合人免疫球蛋白IgG分子中Fc段,而不与鸡抗体球蛋白结合,葡萄球菌A蛋白不干扰检测试剂中的抗体,能消除血清异常球蛋白的干扰,采用双抗体夹心法进行检测。
具体实施方式
实施例1
试剂的制备:
一、乙肝病毒表面抗原试剂盒酶标板的制备
将鸡抗人单克隆IgG抗体用包被液稀释成1∶200倍,加入100μL包被微孔反应板的微孔,加入含1%小牛血清白蛋白磷酸盐缓冲液350μL/每孔,室温封闭2小时,4℃过夜,甩尽孔内液体后,用洗涤液洗3次,每次3分钟。
二、酶标抗-HBs抗体的制备
1.取10mg HRP溶于0.2 mL 25%戊二醛(用0.01mol/L、pH6.8PBS将25%戊二醛稀释为1.25%),室温(20℃左右)反应结合18h。
2.用0.15mol/L NaCl平衡过的Sephadex G-50凝胶柱洗脱,除去游离的戊二醛,或用0.01mol/L,pH7.2PBS,4℃透析过夜。
3.将5mg鸡抗人单克隆IgG抗体溶于1mL 0.15mol/L NaCl,再与醛化HRP溶液(10mg/mL)混合。
4.加入0.1mL 1mol/L pH9.6碳酸盐缓冲液(调节pH至9.0~9.6),4℃,电磁搅拌下结合24h。
5.加入0.1mL0.2mol/L赖氨酸(0.29g溶于10mL蒸馏水),4℃放置2h,以封闭残留的醛基,终止反应。
6.装入透析袋,以0.01mol/L、pH7.2 PBS,4℃透析过夜,或通过Sephadex G-200凝胶柱层析,用PBS洗脱,收集第1峰洗脱液,加入等量60%甘油,测工作效价后,小量分装,4℃或-20℃保存。
三、血清稀释液的制备
在1L 0.9%生理盐水中加入葡萄球菌A蛋白0.1mg、Proclin 300防腐剂200μL。
四、洗液的制备 磷酸盐缓冲液(0.15M pH7.4PBS)配置:0.15M KH2PO4 0.2克,Na2HPO4·12H2O 2.9克,NaC l8.0克,KCl 0.2克,Tween-20 0.5mL,加蒸馏水至1000mL。
五、底物液的配置:终止液为2mol/L硫酸,底物液A为10%的四甲基联苯胺(TMB)、底物液B为30%的H2O2。
实施例2
检测步骤:
1.在100μL血清稀释液中加入待测标本10μL放置试管中静置10分钟。
2.取稀释后的血清标本50μL加入到酶联免疫微孔板孔中37℃孵育30分钟。
3.每孔加入酶结合物1滴,充分混匀,封板,置37℃孵育30分钟。
4.手工洗板:弃去孔内液体,洗涤液注满各孔,静置5秒,甩干,重复5次后拍干。洗板机洗板:选择洗涤5次程序洗板后拍干。
5.每孔加显色剂A液、B液各1滴,充分混匀,封板,置37℃ 孵育15分钟。
6.每孔加入终止液1滴,混匀。
7.用酶标仪读数,数值取波长450nm(建议使用双波长的酶标仪比色,参考波长630nm),先用空白孔校零,然后读取各孔OD值。
在本发明中,葡萄球菌A蛋白可以结合人血清中的非特异性的免疫球蛋白,而不与检测试剂中鸡抗人单克隆IgG抗体,去除了非特异性干扰,利于乙肝表面抗原的检测,减少了干扰反应,特别是机体异常球蛋白增多的情况下,本发明在检测中具有明显优势。
Claims (4)
1.一种乙肝病毒表面抗原试剂盒及测定方法,属于免疫分析技术领域,本发明的技术特征为:偶联酶和微孔载体的单克隆抗体采用鸡抗人单克隆IgG抗体,生理盐水中加入葡萄球菌A蛋白作为血清稀释液,葡萄球菌A蛋白结合血清中免疫球蛋白IgG分子中Fc段,而不与鸡抗体球蛋白结合,采用双抗体夹心法进行检测,葡萄球菌A蛋白不干扰检测试剂中的抗体,能消除血清异常球蛋白的干扰。
2.根据权利要求1所述的一种乙肝病毒表面抗原试剂盒及测定方法,其特征在于试剂中偶联酶和微孔板的抗体为鸡抗人单克隆IgG抗体。
3.根据权利要求1所述的一种乙肝病毒表面抗原试剂盒及测定方法,其特征在于血清稀释液为加入葡萄球菌A蛋白的生理盐水溶液,葡萄球菌A蛋白0.05~1.00mg/L,Proclin300防腐剂100~300μl,其中Proclin 300为高效防腐剂,葡萄球菌A蛋白可以结合血清中的非特异性的免疫球蛋白IgG,而不与检测试剂中鸡抗人单克隆IgG抗体,去除了非特异性免疫球蛋白干扰,利于乙肝表面抗原的检测,减少了干扰反应。
4.根据权利要求1所述的乙肝病毒表面抗原试剂盒及测定方法,其特征在于采用双抗体夹心法进行检测。
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