特定蛋白检测仪检测血浆IgG含量方法的验证及其应用

目的对特定蛋白检测仪BN-P检测血浆IgG含量的散射比浊法(nephelometry)进行验证,并用于层析法制备IgG的工艺过程监控。方法使用BN-P和IgG相关试剂对检测IgG含量的散射比浊法进行线性和范围、准确度、精密度、专属性、耐用性验证,并进行样品添加试验,将用该方法检测5批IgG成品的结果与凯氏定氮法比较,同时检测层析法制备的3批IgG工艺过程样品中IgG含量。结果用该方法检测蛋白SL标准品中IgG的线性范围为0.107~0.003 34 g/L;高、中、低浓度的SL/H(高水平)蛋白质控品的批内准确度为87.60%~91.05%,批间准确度为88.5%~90.5%;批内精密度CV值为1.85%~3.65%,批间精密度CV值为2.46%~3.16%;检测方法不受血浆白蛋白的干扰,专属性良好;样品经反复冻融5次以内检测,耐受性良好,5次以上耐受性较差;样品添加试验的回收率在90.2%~93.1%之间。该方法检测5批IgG成品中IgG含量,与凯氏定氮法相比差异无统计学意义(P0.05);该方法检测3批IgG工艺过程中间品重复性较好,步骤回收率一致,工艺稳定。结论特定蛋白检测仪BN-P检测血浆IgG含量的散射比浊法准确可靠,可用于IgG制备工艺的过程监控。     

优化辛酸沉淀工艺参数后结合两步层析法分离纯化IgG效果

目的 优化辛酸沉淀工艺参数,并结合两步层析纯化,评价10％静注人免疫球蛋白(intravenous immunoglo-bulin,IVIG)中杂蛋白去除效果.方法 对溶解倍数、反应液终pH值、辛酸钠浓度3个因素进行优化,设计3因素3水平的正交试验方案,优选辛酸沉淀工艺参数;取100 g组分Ⅱ+Ⅲ沉淀,按最佳工艺参数进...     

凝胶层析法测定蛋白含量的方法

利用蛋白纯化仪建立一种凝胶层析测定蛋白含量的方法,采用HiTrapTMDesalting 5×5 mL色谱柱,流动相为超纯水,以蛋白浓度为横坐标,以蛋白出峰面积为纵坐标,建立标准曲线。与BCA试剂盒法比较,BCA试剂盒法相对误差范围为9.13%～144.00%,此法的相对误差范围为0.78%～44.72%,可见凝胶层析法测定结果准确性高,操作简单,快速,是一种可行的测蛋白含量的方法。     

阴离子交换层析法纯化聚唾液酸工艺

以大肠杆菌发酵所产聚唾液酸粗品(含蛋白质、核酸、无机盐和色素等杂质)为纯化对象,通过静态吸附和梯度洗脱实验选择了分离效果较好的阴离子交换介质Q-琼脂糖凝胶FF,对聚唾液酸的纯化工艺条件进行优化. 得到最佳洗脱条件为：洗脱液为pH 7.2的NaCl-0.02 mol/L磷酸钠缓冲液体系,流速0.8 mL/min,洗脱线性梯度方程为CNaCl=0.0017VEluent (CNaCl为NaCl浓度,VEluent为洗脱液体积),层析柱体积46 mL时最大进样量4.0 mL. 该条件下聚唾液酸回收率在86.0%以上,纯化后样品中的蛋白质含量从1.9%降低至0.04%,纯度在98%以上. 紫外吸收光谱和高效凝胶过滤色谱分析表明,聚唾液酸产品组分均一,重均分子量为303 kDa.     

人血浆蛋白C的纯化与鉴定

目的　建立人血浆蛋白C的纯化与鉴定方法。方法　利用DEAE SephadexA 5 0代替氯化钡 ,对血浆进行预处理 ,再经DEAE SepharoseFF离子交换和肝素 SepharoseCL 6B亲和层析进行分离纯化 ,用活化的部分凝血活酶时间 (APTT)测定组分活性 ,非还原型SDS PAGE测定其相对分子质量 ,Westernblot鉴定其特异性。结果获得相对分子质量为 6 2 0 0 0的蛋白条带 ,此条带可与人蛋白C单克隆抗体发生特异性反应。结论　已成功地从血浆中分离到蛋白C ,为其规模化生产奠定了基础。     

人凝血因子Ⅷ中试纯化工艺的质量控制

目的对以PEG沉淀结合离子交换层析制备的人凝血因子Ⅷ(human coagulation factorⅧ,FⅧ)的中试纯化工艺进行全程质量控制。方法收集FⅧ中试纯化工艺的样品,采用凝固法检测FⅧ凝固活性、BCA法检测总蛋白含量,计算比活性;采用免疫浊度法检测白蛋白(albumin,ALB)、IgG、纤维蛋白原(fibrinogen,FIB)及纤维连接蛋白(fibronectin,FNC)含量;采用双抗体夹心ELISA法检测FⅧ及von Willebrand因子(von Willebrand factor,vWF)抗原含量;采用SDS-PAGE及Western blot法分析FⅧ特异性;参考《中国药典》(三部)2010版检测成品中PEG、Tween 80及磷酸三丁酯[tr(in-butyl)phosphate,TNBP]残留量。结果层析去掉了大部分杂蛋白,层析后比活性提高了近20倍,原液比活性达到66.92 IU/mg。PEG沉淀和DEAE层析纯化,基本去除了ALB、IgG、FIB和FNC,仅有少量FⅧ抗原及活性损失,原液主要成分为FⅧ和vWF。DEAE层析洗脱峰样品在相对分子质量约95 000和72 000之间可见一条特异性条带,与FⅧ轻链(相对分子质量80 000)及冻干FⅧ国家标准品条带位置相符。PEG、Tween 80及TNBP残留量均符合《中国药典》(三部)2010版规定的FⅧ质量标准。结论本中试纯化工艺可制备出高纯度、高比活性的FⅧ。     

实验设计在重组人生长激素-Fc融合蛋白纯化工艺建立过程中的应用

目的 通过实验设计(Design of Experiment,DOE)对重组人生长激素-Fc(recombinant human growth hormone-Fc,rhGH-Fc)融合蛋白纯化工艺中阴离子交换层析的层析条件进行优化,以降低蛋白原液中宿主蛋白(host cell protein,HCP)含量。方法 利用Minitab 19中DOE功能创建4因子2水平完全析因实验设计,通过DOE对rhGH-Fc纯化工艺中离子交换层析条件(流速、上样量、缓冲液pH、洗脱液盐浓度)进行优化,找出操作空间。结果 建立的DOE模型能准确预测实验结果,其中上样量、缓冲液pH、洗脱盐浓度以及缓冲液pH与洗脱液盐浓度的交互效应对收获液中HCP含量有显著影响。获得的最佳层析条件为：上样量15 mg/mL,流速120 cm/h,洗脱液pH 7.0～8.0,洗脱液盐浓度0.1 mol/L。该层析条件下洗脱液中HCP含量均<400 ng/mg,在确定操作空间的结果范围内满足验证要求。结论 本实验成功应用DOE确定了阴离子交换层析去除HCP的最佳层析条件,为其在生物制药领域的更多应用提供了参考。     

妊娠相关血浆蛋白A的分离及纯化

采用人胎盘血为原料,利用Sephadex G-200,DEAE-Sephadex A-50层析,Sepharose 4B反相免疫亲和层析技术,获得妊娠相关血浆蛋白A(PAPP-A)纯品,经8.0％聚丙烯酰胺凝胶电泳、免疫电泳、双向免疫扩散证明,所提取的PAPP-A纯品为单一成分。免疫家兔获得抗血清,其效价在1:16以上。     

几种柱层析的特点和在纯化工艺中的选择

在过去的三十年中,分离生物大分子的各种技术和方法得到了不断的发展。随着各种介质的完善和商品化,使以填料为核心的柱层析技术在蛋白质等粗提后的纯化中起到了重要作用。本文在一定范围内,仅就其中几种最常用柱层析的特点和在纯化中的选择应用作一综述。一、几种柱层析的特点1凝胶过滤柱层析(ＧｅｌＦｉｌｔｒａｔｉｏｎＣｈｒｏｍａｔｏｇｒａｐｈｙ,ＧＦＣ)ＧＦＣ是以分子大小和形状为分离基础的。具体说就是利用不同大小分子通过凝胶滞留时间的差别来分离混合物的柱层析方法。另外一种说法是分离是以分子体积的大小为基础的,分子体积即…     

纯化水制备工艺在制药生产中的应用分析

纯化水作为制药生产过程中大量使用的工艺用水,对药品生产和用药者的安全是至关重要的。对多条纯化水制备工艺进行分析,从出水质量、投入成本、耗能及环保等方面评价,提出了符合制药企业实际的制备纯化水的工艺流程组合方案。认为反渗透法制备纯化水(二级RO、二级RO+EDI、一级RO+EDI)的制水流程非常适用于制药行业。     

一步柱层析纯化血浆分离多种血液制品组分

目的采用一步吸附及分步解吸的柱层析技术——扩张床吸附(expanded bed adsorption,EBA)技术,从原料血浆中分离多个有效组分,从而提高血浆的综合利用率。方法以琼脂糖(碳化钨)-DEAE为吸附介质,将原料血浆按一定流速流经层析柱,并使待分离组分吸附于介质上,通过不同的缓冲液组成、洗脱流速、洗脱体积分步分离有效组分,并初步探讨工艺放大过程中的关键因素。结果 EBA技术可从原料血浆中依次分离出白蛋白、免疫球蛋白、纤维蛋白原、α-1蛋白酶抑制剂4种蛋白;该技术在工艺放大过程中,柱高及洗脱流速是影响分离效果的关键因素;该技术可去除部分病毒,使病毒滴度降低约一个数量级。结论一步柱层析技术具有血浆综合利用度高、易操作、操作周期短、成本低、可去除病毒等优势,其有望成为传统低温乙醇工艺的有效替代技术,应用于工业化生产。     

新型层析技术在人乳头瘤病毒L1蛋白病毒样颗粒快速纯化中的应用

目的采用新型层析技术快速纯化人乳头瘤病毒(human papillomavirus,HPV)L1蛋白病毒样颗粒(virus-like particles,VLPs)。方法应用新型的基于阴离子交换和分子筛原理的色谱填料CaptoCore 700初纯昆虫细胞表达的HPV L1蛋白VLPs,再用高流速、高分辨力的阴离子交换树脂Capto Q ImpRes进一步纯化。各步纯化的样品经SDSPAGE进行分析,采用ImageQuant图像分析软件分析两步纯化后蛋白的纯度,并对初纯蛋白进行质谱分析;改良Lowry法测定初纯蛋白的浓度,并计算杂蛋白去除率。结果昆虫细胞表达的HPV L1蛋白经CaptoCore 700初纯后,目标蛋白组成的VLPs存在于流穿组分中,经质谱分析,为目的蛋白HPV L1;料液处理量为1个柱体积时,杂蛋白去除率达80%,料液处理量为2个柱体积时,杂蛋白去除率为76%。初纯的蛋白经Capto Q ImpRes进一步层析纯化,HPV L1蛋白的纯度接近100%。结论 CaptoCore 700加Capto Q ImpRes两步层析纯化能够快速高效地纯化HPV L1蛋白VLPs,整个工艺过程简单、快速、高效、易放大,适用于大规模生产。     

The determination of specific free fatty acids in peanut oil by gas chromatography

Peanut oil is dissolved in 2,2,4-trimethylpentane standard. The free acids are extracted into N,N-dimethylformamide as their sodium salts and treated with methyl iodide. The resulting methyl esters are analyzed by gas chromatography. A typical result for oleic acid is about 200 ppm with a relative standard deviation of 6%. An average recovery of 95% is obtained from a sample spiked with an additional 200 ppm of oleic acid. Evidence is presented that the procedure does not give high values as a result of sample hydrolysis.     

A purification method for specific serine proteases using one-step affinity chromatography

A simple affinity chromatography procedure for specific isolation of serine proteases is described. The procedure was tested using enzymes from five microbial and one plant source. Feather keratin, covalently bound to controlled-pore glass, was the support and magnesium chloride was used in the elution buffers instead of zinc chloride. This enabled one-step isolation of serine proteases present in the biological materials used. The small (15 cm × 1 cm) controlled-pore keratin-glass column allowed high flow rates and protected the proteases from autodigestion during the chromatography process. The serine proteases were eluted from the column with good recovery (40–84·6%) and a purification efficiency between 5 and 7. The purified proteases were homogeneous by polyacrylamide gel electrophoresis.     

Affinity chromatography system for parallel purification of recombinant protein samples

In protein engineering, the tasks of generating and testinga large number of variants of a molecule and of optimizing expressionconditions for one distinct molecule create the need for purificationmethods that can handle a large number of samples simultaneously.We describe the development and some application results ofa simple affinity chromatography system that can be used forthe parallel purification of 24 protein samples, yielding sufficientquantities for biochemical and functional analysis. Advantagesof this system over existing systems are as follows. Comparedwith commercially available complete chromatography systems,the costs of this system are minimal. In comparison with vacuumsystems with various outlets, and with batch purification systemswhere centrifugation is necessary, this system allows gentlerprocessing of the samples. This could be important for proteinsthat are easily damaged.     

连续中压硅胶柱层析纯化法夫酵母虾青素

采用连续中压硅胶柱层析纯化虾青素,原料为含量高于20%的法夫酵母虾青素。连续中压柱层析分离工艺条件为:不锈钢中压层析柱装填120～160μm层析硅胶,以石油醚∶1,2-二氯乙烷∶丙酮(体积比)为5∶2.5∶1作洗脱剂,负载量为1∶7,可以得到纯度大于97%的虾青素产品,平均回收率大于60%。回收的洗脱液经校正后可重复使用。使用后的层析柱以丙酮为再生液再生,石油醚为平衡液平衡,平衡后的层析柱可重复使用多次。利用该工艺方法纯化虾青素,与传统方法相比溶剂用量少、层析填料价格低、生产周期短、分离效果好,易于实现连续工业化清洁生产。     

Antibody purification by concanavalin A affinity chromatography

Concanavalin A (Con A) immobilized poly(2‐hydroxyethyl methacrylate) (PHEMA) beads in a spherical form (100–150 μm in diameter) were used for the affinity chromatography purification of human immunoglobulin G (IgG) from aqueous solutions and human plasma. PHEMA adsorbents were prepared by suspension polymerization. Bioligand Con A was then immobilized by covalent binding onto PHEMA beads. The maximum IgG adsorption on the PHEMA/Con A beads was observed at pH 6.0. The nonspecific IgG adsorption onto the plain PHEMA adsorbents was very low (ca. 0.17 mg/g). Higher adsorption values (up to 54.3 mg/g) were obtained when the PHEMA/Con A beads were used from aqueous solutions. A higher adsorption capacity was observed for human plasma (up to 69.4 mg/g) with a purity of 82.5%. The adsorption capacities of other blood proteins were 2.0 mg/g for fibrinogen and 4.2 mg/g for albumin. The total protein adsorption was determined to be 76.0 mg/g. IgG molecules could be repeatedly adsorbed and desorbed with the PHEMA/Con A beads without noticeable loss in the IgG adsorption capacity. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1202–1208, 2005     

Separation and purification of lecithins by high pressure liquid chromatography

Ten different synthetic lecithins have been analyzed by reverse-phase high pressure liquid chromatography. An empirical lecithin “carbon number” that depends on the total number of carbons and double bonds in the fatty acyl chains in a useful index in predicting retention volumes of lecithins on a nonpolar octadecyl fatty acid column. Commercial egg lecithin is separated into its components by this technique.