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> 亲和层析
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> 2021年6月24日 21:50
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- 亲和层析
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- 基本原理
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◊ 定 义
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◊ 通过生物分子之间的特异性的识别并相互作用来分离纯化物质
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◊ 如酶和底物、抗原和抗体之间专一的相互作用
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◊ 将其一作为配基固定在填料上,就可以从初始样品中吸附相应的生物分子,
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通过洗脱将其解离达到纯化的目的
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◊ 优势特点
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◊ 能够完成一般方法很难完成的分离
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◊ 经常可以一步达>90%的纯度
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◊ 高选择性
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◊ 高分辨率
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◊ 高结合载量
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◊ 快速将目标蛋白与大量杂质分离
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◊ 填料结构
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![](media/09cc0ebf1fa0829200128d07bc9a250f.jpeg)◊ 较长的间隔臂
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- 层析步骤
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![](media/03f846d5ecdb41d44b71356f69f4a7f0.jpeg)◊ 一般操作步骤和层析图谱
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> ◊
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> ◊ 上样前的样品优化
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> ◊ 加强目的分子与配基之间的特异性亲和力
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> 上样前,过滤或离心样品以去除颗粒性固体成分
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> 调节样品的pH、盐浓度和添加剂来提高结合的效率
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> 通过脱盐柱置换缓冲液,去除能影响结合的物质
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> ◊ 样品洗脱方式
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> ◊ 打破目的分子和配基之间的亲和力
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> 常规洗脱
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- 改变缓冲液的组成
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- 高盐洗脱
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![](media/86136ced187b0f8c24d0816c16ef861c.jpeg)
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- 使用极端pH或者变性剂
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- ![](media/76a2290d09d38afe0f53d7e14f31a2ae.jpeg)低pH缓冲液冲洗抗体
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> 竞争洗脱
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- ![](media/0b061ab0927a8e868aea07b305af454d.jpeg)加入目的分子类似物
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>
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- 加入配基类似物
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![](media/9418a67cab428d4977dddd8fef8b5b9e.jpeg)
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> ![](media/77692f49707eec82597eda4d52c546fe.jpeg) 图 片
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–
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- 应用举例
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◊ 标签蛋白亲和层析
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![](media/00c77d3f4a435d6447c7b197f6c99ff0.jpeg)◊ 基本原理
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>
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> ◊ 亲和标签的种类
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> 短肽类小标签
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> 大标签
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> 双标签
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> ![](media/1d9663f840ce948595d9e82188ead820.jpeg) 图 片
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–
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> ◊ His标签蛋白的纯化
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> ![](media/175df3abf854007bb039039422fcd423.jpeg)
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> Ni填料结构和His标签亲和原理
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–
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> 常规的His标签蛋白纯化填料
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![](media/abef10bbd45bd4636682ce2afba2d4f2.jpeg)
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> 结合液咪唑浓度的摸索
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- ![](media/1b5cef49b199ffde751b81855b2ab330.jpeg)Ni填料离心柱快速筛选
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- ![](media/22436fd7b8de8c152239b1b984798445.jpeg)预装柱线性梯度洗脱
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> ![](media/5ba89020a7c2da8cfb82d8ea69716227.jpeg)
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> Ni柱之后的精纯(一般接分子筛)
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> –
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> Ni Sepharose excel
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- ![](media/dc1eefbd0e911ed14ea749270eda0bbc.jpeg)用于纯化大体积分泌蛋白
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- ![](media/e52f487eed9751de9c4dec5463cd434a.jpeg)耐酸耐碱、耐EDTA、耐还原剂
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> 金属离子的筛选
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- ![](media/2041b079594f533dddc968bd96fffc6d.jpeg)IMAC Sepharose
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> ![](media/5ed329d81a3258f0ab95010dbada655e.jpeg) TALON Superflow-纯度最高
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> –
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> ◊ Strep(Ⅱ)和两联Strep(Ⅱ)标签蛋白的纯化
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> 原理和介绍
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![](media/ae05692ce62d9b89e14e651311c4d9c5.jpeg)
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> ![](media/714c91576f65c9afdc09bdde0e74ddb4.jpeg) 原理及特点
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–
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> ![](media/70f0eb46b47b84f161d3b8accdb7e0ab.jpeg) 纯化实例
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–
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> ◊ GST标签蛋白的纯化
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> ![](media/eac9eae7882f7ebc365ca73e00c86695.jpeg) 填料结构和亲和原理
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–
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> ![](media/25c5e5c206497ff8567306664860f62b.jpeg) 特 点
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–
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> ![](media/54f6cd3de7e0cc89820aac1216470886.jpeg) GST填料的结合和洗脱
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–
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> ![](media/f462fad244c05827ff3aadb9f553d336.jpeg) 填料的种类
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–
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> ![](media/e6623c44409dc14d25efb617e2356aac.jpeg) GST标签的酶切
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–
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> 使用PreScission酶对GST标签蛋白进行柱上酶切
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> –
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> 洗脱后酶切前的分子筛精纯
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- ![](media/0c597b24eaa7ec99c099ff07ab43f4b7.jpeg)去除且不开的高聚组份
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> 其他条件优化
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- ![](media/3d7f4a0f1fe5070dc76910f2094f4ff2.jpeg)降低上样流速有利于目的分子结合
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- ![](media/1fad7981f6544e5ae766f2967c3364fa.jpeg)提高样品浓度有利于目的分子结合
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> 杂质对于纯度的影响
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- ![](media/ac20cd471b9a7094cdb88ece265a58db.jpeg)杂质可能结合目的蛋白而非GST标签和GST层析柱
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> ![](media/efbb64164bceb18517464391582a6025.jpeg)
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> Cytiva全流程GST标签融合蛋白解决方案
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> –
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> ◊ MBP标签蛋白的纯化
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> ![](media/562b5e9737f3e57505534762f6b73035.jpeg) 填料结构和亲和原理
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> –
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> 特 点
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![](media/7e4b66f87f473a9ba342babc90fef564.jpeg)
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> ![](media/030fd5b84b0f28c86753cfa70705c2de.jpeg) 纯化实例
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–
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> 双标签蛋白的纯化
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- ![](media/977a5f00387506c2c3b9eeb968c40c88.jpeg)N和C端各连接一个标签
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> ◊ 抗体亲和层析
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> ![](media/6420f96db0121f2a3fbcef3adad11def.jpeg)◊ 抗体的结构
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>
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> ![](media/9ba7869ecdf1d0ea12e32c8a444382b8.jpeg)◊ Protein G填料特点
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>
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> ![](media/e6cfcb6795e9f28dd80a00826637bbca.jpeg)◊ Protein A填料特点
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> ![](media/fa218414bf06ed66536f477f04891a68.jpeg)◊ Protein A和Protein
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> G蛋白与抗体亚型的亲和力
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>
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> ◊ MabSelect家族
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> ![](media/f8815e1d53fb096e34d5a14a007a99c2.jpeg) 发展历史
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–
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> 不同比较
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![](media/2c26a59d353695dbdb571b8e6719e858.jpeg)
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> MabSelect PrismA综合性能最佳
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- ![](media/a7b279c2dab74ae0e9ef5302909aeec0.jpeg)对人lgG可达80mg/ml载量
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- ![](media/6a5af150329514708197e9980ffea7bb.jpeg)碱洗CIP300循环下仍可保持高载量
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- ![](media/3c3f9cdaeaed5088d2376e4b703aa446.jpeg)强碱NaOH对层析填料的清晰效果
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- ![](media/3bdcf4eeb08b88688a36061db135afe0.jpeg)图片
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> ![](media/e61f6955a610908ffd815a6ceae88c2a.jpeg)◊ 耐碱配基的研发过程
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>
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> ◊ 纯化实例
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> Protein A填料
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- ![](media/3552600d4f8efc9898b742776a5d8293.jpeg)图谱和电泳
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- ![](media/c029b49781be55d79a438ce22958588a.jpeg)pH和离子强度的优化
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> Protein G填料
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- 图谱和电泳
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![](media/760fff92528793e2a9ef74f402a7c10f.jpeg)
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> ![](media/beb3f665ccf3eeacbe22f17ff99957ac.jpeg) 耐碱的MabSelect SuRe填料
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–
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> ![](media/b9d753b9d557ad2bbf219a8590e28473.jpeg) 耐碱的载量最高的MabSelect
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> PrismA填料
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–
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> ![](media/d7850d6ee107477a5558c38f9290730a.jpeg)◊ 工业生产工艺路线
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>
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> ◊ 抗体片段亲和层析
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> ![](media/f3a5fc7603fb91fd570d55591360a0a9.jpeg) 抗体片段的结构
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–
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> Capto L填料
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- ![](media/c09a25deff5a5bb926142f331fcc6bca.jpeg)配基为Protein L
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- ![](media/8365e201ed91e910f69467c8992ea28e.jpeg)实例
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> ![](media/fe41754961114efe08662c9415f8a2b5.jpeg) 替代方案
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–
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> KappaSelect&LambdaFabSelect填料
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![](media/6d593fe3229dfb15cc56470c2a42e386.jpeg)–
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> ![](media/811ba8c720ba91537816afdf320908df.jpeg)◊ lgM的纯化
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> ![](media/61198a2fb9b74193636be23b760079c5.jpeg)◊ lgY的纯化
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> ◊ 族特异亲和层析
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> ![](media/3306d2df0eb799c087c598c5b7ec01ba.jpeg)◊ 填料的种类
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> ![](media/334a790a843737670b3201cc2eb1c74c.jpeg)◊ Con A和Lentil
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> Lectin填料捕获含多糖物质
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> ![](media/e6376da7fa268e944dc3d5e1df312515.jpeg)◊ 细胞外膜蛋白质组的提取
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> ◊ 预活化亲和层析
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> ![](media/c7284ecccdc6348cd40a329e83d7c640.jpeg)◊
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> 预活化填料共价偶联配基去吸附目标分子
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> ![](media/a7ee78ae3c5f8920c5e0ace5a887ddb0.jpeg)◊ 填料的特点
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> ◊ 利用TNF-α的抗体片段作为配基纯化TNF-α
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> ![](media/d13a2dabb8f714cacd11329217f5c961.jpeg)
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> ![](media/3cd32f425a559da6aea04446eea91e07.jpeg)◊
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> 草酸作为配基从肾脏中垂钓草酸结合蛋白
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>
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> ![](media/323b3b98c76ee3f35f0cbef91600cd50.jpeg)
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