CN114751834A - 一种文拉法辛衍生物、免疫原、抗文拉法辛特异性抗体及其制备方法与应用 - Google Patents
一种文拉法辛衍生物、免疫原、抗文拉法辛特异性抗体及其制备方法与应用 Download PDFInfo
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- CN114751834A CN114751834A CN202011561068.9A CN202011561068A CN114751834A CN 114751834 A CN114751834 A CN 114751834A CN 202011561068 A CN202011561068 A CN 202011561068A CN 114751834 A CN114751834 A CN 114751834A
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Abstract
本发明公开了一种文拉法辛衍生物、免疫原、抗文拉法辛特异性抗体及其制备方法与应用。首先将新型文拉法辛衍生物与经过基因工程改造得到的重组鸡卵清白蛋白偶联制得文拉法辛人工抗原,再用文拉法辛人工抗原免疫实验动物获得抗文拉法辛特异性抗体,经ELISA检测表明该特异性抗体的特异性强、灵敏度高,干扰实验显示该特异性抗体与100种常见药物无任何交叉反应;将抗文拉法辛特异性抗体应用于制备文拉法辛检测试剂,包括文拉法辛均相酶免疫检测试剂与文拉法辛胶乳增强免疫比浊检测试剂,所述检测试剂可以实现在全自动生化分析仪上对文拉法辛的高通量、快速化检测。
Description
技术领域
本发明涉及一种文拉法辛衍生物、免疫原、抗文拉法辛特异性抗体及其制备方法与应用,属于生物医学检测技术领域。
背景技术
文拉法辛(Venlafaxine)为二环类苯乙胺族化合物,化学结构式为±1-[2-(二甲胺基)-1-(4-甲氧苯基)乙基]环己醇,其分子式为:C17H27NO2,相对分子量为:277.4,具有R,S两种构型,各占50%。作为一种新型抗抑郁药,文拉法辛及其活性代谢物具有抑制5-羟色胺(5-HT)和去甲肾上腺素(NE)在神经突触部位再摄取的作用。该药物口服后,在胃肠道吸收良好,在肝脏进行首过代谢后,主要的代谢产物为O-去甲基文拉法辛(ODV),ODV具有和母体化合物相同的药理活性。临床主要用于治疗抑郁症和广泛性焦虑障碍(GAD)。
患者的年龄、性别、临床状况、代谢酶基因型和其它药物的存在都可能影响文拉法辛在患者体内的药代动力学。儿童、老人、孕期妇女及高血压患者应及时监测血清中文拉法辛水平并及时调整治疗剂量。肝、肾功能不全的患者的药物清除率有较大个体差异,应及时监测文拉法辛的血药浓度,避免药物在体内过量积累。CYP2D6基因型将对文拉法辛在体内的血药浓度产生很大影响,在与经CYP2D6代谢的药物合用时,应及时监测文拉法辛的血药浓度,同时,禁止与单胺氧化酶抑制剂(MAOIs)联用。由于文拉法辛在临床上会引起患者的诸多不良反应,如血压升高、心动过速、肝功能异常、泌尿系统和内分泌系统失常等。因此应密切监测药物的血药浓度及不良反应,及时发现,及时处理,确保用药安全。
文拉法辛的血药浓度检测方法有多种,包括反相高效液相色谱法(RP-HPLC)、紫外吸光度检测法(HPLC-UV)、高效液相色谱荧光法、高效液相串联质谱法(LC-MS/MS)、均相酶免疫法(HEIA)等。反相高效液相色谱法具有良好的准确度和重现性,但此法无法检测文拉法辛代谢物,具有一定的方法缺陷,紫外吸光度检测法虽然简便快速,重复性好,但灵敏度不高,准确性较差。由于人体血浆中文拉法辛的血药浓度很低,高效液相色谱荧光法与高效液相串联质谱法可提高检测灵敏度,但测定时间较长,测定结果中常常包含代谢物浓度,并且,荧光或质谱检测对设备及萃取方法要求比较高。
因此,目前市面上缺乏线性范围宽、灵敏度高、准确度高、精密度高,检测时间短,样品处理简单,仪器自动化程度高,可多样本连续检测的文拉法辛检测产品。
发明内容
为了克服现有技术的不足,本发明的第一个目的在于提供一种文拉法辛衍生物,该衍生物为新合成的化合物,自然界中不存在。
本发明的第一个目的采用以下技术方案实现:一种文拉法辛衍生物,其结构式如式Ⅰ所示:
本发明的第二个目的在于提供一种如上所述的文拉法辛衍生物的合成方法,该合成方法不同于常规合成方法,具有良好的合成效果,显著提高了文拉法辛衍生物的合成效率。
本发明的第二个目的采用以下技术方案实现:一种如上述结构式Ⅰ所示的文拉法辛衍生物的合成方法,反应过程如下式所示:
具体的,反应过程包括以下步骤:
(A1)化合物2的合成:
将化合物1 (15 g,57 mmol)与4-溴丁酸乙酯(12 g,62 mmol)共同溶解于含有K2CO3 (9.6 g,70 mmol)的DMF(50 ml)中制成反应混合物,然后将此反应混合物在80℃下搅拌过夜。反应结束后的混合物用乙酸乙酯稀释,再用碳酸氢钠溶液和浓盐水洗涤,并用硫酸钠进行干燥处理。蒸发溶剂后得到化合物2。
(A2)文拉法辛衍生物的合成:
将化合物3(7 g,19 mmol)溶解于MeOH(50 ml)中,然后加入LiOH(1.2 g,30 mmol)制成反应混合溶液,然后将此反应混合溶液在室温下搅拌过夜,然后将溶剂进行减压蒸发,再将残留物通过硅胶层析进行纯化,得到文拉法辛衍生物。
本发明的第三个目的在于提供一种文拉法辛免疫原。
本发明的第三个目的采用以下技术方案实现:一种文拉法辛免疫原,所述文拉法辛免疫原由上述结构式Ⅰ所示的文拉法辛衍生物与载体蛋白连接而成,其结构式如式Ⅱ所示:
其中,载体蛋白为重组鸡卵清白蛋白,进一步地,所述重组鸡卵清白蛋白的氨基酸序列如序列表SEQ ID NO:1所示。
重组鸡卵清白蛋白的氨基酸序列(SEQ ID NO:1)具体如下:
MGSIGAASMEFCFDVFKELKVHHANENIFYCPIAIMSALKMVYLGAKDSTRTQINKVKRFDKLPGFGDSIEAQCGTSVNVHKSLRDILNQITKPNDVYSFSLASRLYAKERYPILPEYLQCVKELYRGGLEPINFQTKADQARELINSWVESQTNGIIRNVLQPSSVDSQTAMKLVNAIVFKGLWEKAFKDEDTQAMPFRVKEQESKPVQMMYQIGLFRVASMAKEKMKILELPFASGTMSMLVLLPDEVSGLEQLESIINKEKLTEWTSSNVMEERKIKVYLPRMKMEKKYNLTSVLMAMGITDVFSSSANLSGISKAESLKISQAVHAAHAEINEAGREVVGSAEAGVDKASVSEEFRADHPFLFCIKHIATNAVLKFGRCVSP
本发明的第四个目的在于提供一种如上所述的文拉法辛免疫原的制备方法。
本发明的第四个目的采用以下技术方案实现:一种如上所述的文拉法辛免疫原的制备方法,包括以下步骤:
(B1)载体蛋白溶液的制备:将上述的重组鸡卵清白蛋白溶解于磷酸盐缓冲液中,得到载体蛋白溶液;
(B2)文拉法辛衍生物溶液的制备:将上述结构式Ⅰ所示的文拉法辛衍生物与二甲基甲酰胺、乙醇、磷酸钾缓冲液、1-乙基-3-(-3-二甲氨丙基)碳二亚胺和N-羟基硫代琥珀酰亚胺混合,搅拌溶解,得到文拉法辛衍生物溶液;
(B3)文拉法辛免疫原的合成:将步骤(B2)得到的文拉法辛衍生物溶液加入到步骤(B1)得到的载体蛋白溶液中,搅拌反应,经透析纯化,得到文拉法辛免疫原。
具体的,所述文拉法辛免疫原的制备方法,包括以下步骤:
(b1)载体蛋白溶液的制备:将重组鸡卵清白蛋白溶解于0.35mol/L的磷酸钾缓冲液(pH=8.5)中,重组鸡卵清白蛋白的终浓度为5.0mg/mL,得到载体蛋白溶液;
(b2)文拉法辛衍生物溶液的制备:将250.0mg上述的文拉法辛衍生物、7.5mL二甲基甲酰胺、7.5mL乙醇、15.0mL的磷酸钾缓冲液(10.0mmol/L,pH=8.0)、150.0mg 1-乙基-3-(-3-二甲氨丙基)碳二亚胺、90.0mg N-羟基硫代琥珀酰亚胺混合,搅拌溶解反应3小时,得到文拉法辛衍生物溶液;
(b3)文拉法辛免疫原的合成:将步骤(b2)得到的文拉法辛衍生物溶液逐滴加入到步骤(b1)得到的载体蛋白溶液中,并在-4℃下搅拌过夜,经透析纯化,得到文拉法辛免疫原。
本发明的第五个目的在于提供一种抗文拉法辛特异性抗体。
本发明的第五个目的采用以下技术方案实现:一种抗文拉法辛特异性抗体,所述抗文拉法辛特异性抗体为使用上述的文拉法辛免疫原对实验动物进行注射后所得到的特异性抗体,所述的实验动物为兔子、山羊、绵羊、小鼠、大鼠、豚鼠或马中的一种。
本发明的第六个目的在于提供一种如上所述的抗文拉法辛特异性抗体的制备方法。
本发明的第六个目的采用以下技术方案实现:一种如上所述的抗文拉法辛特异性抗体的制备方法,包含以下步骤:
(C1)将上述的文拉法辛免疫原用磷酸盐缓冲液稀释,得到文拉法辛人工抗原溶液,然后将文拉法辛人工抗原溶液与等量弗氏完全佐剂混合,对上述的实验动物进行多点注射;
(C2)3-6周后,再用相同的文拉法辛人工抗原溶液与等量弗氏不完全佐剂混合,对上述实验动物进行多点注射,之后每隔3-6周注射一次,共计注射3-10次;
(C3)对步骤(C2)中完成注射的实验动物取血,分离纯化,得到抗文拉法辛特异性抗体。
具体的,所述抗文拉法辛特异性抗体的制备方法,包含以下步骤:
(c1)将上述的文拉法辛免疫原用0.15mol/L磷酸钠缓冲液(pH=7.0)稀释至终浓度为3.5mg/mL,得到人工抗原溶液,然后将3.0mL人工抗原溶液与等量弗氏完全佐剂混合,对实验动物兔子进行多点注射;
(c2)4周后,再用3.0mL相同的人工抗原溶液与等量弗氏不完全佐剂对上述实验动物兔子进行多点注射,之后每隔5周注射一次,共计注射6次;
(c3)对步骤(c2)完成注射的实验动物兔子取血,分离纯化,得到抗文拉法辛特异性抗体。
本发明的第七个目的在于提供一种如上所述的抗文拉法辛特异性抗体的应用。
本发明的第七个目的采用以下技术方案实现:一种如上所述的抗文拉法辛特异性抗体的应用,将所述抗文拉法辛特异性抗体用于制备文拉法辛检测试剂,所述文拉法辛检测试剂包括文拉法辛均相酶免疫检测试剂与文拉法辛胶乳增强免疫比浊检测试剂。
优选地,上述的抗文拉法辛特异性抗体的应用,所述文拉法辛均相酶免疫检测试剂,由R1试剂与R2试剂组成,所述R1试剂包含上述的抗文拉法辛特异性抗体与R1缓冲液,所述R2试剂包含文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物与R2缓冲液;
所述的R1缓冲液含有酶底物、辅酶、牛血清白蛋白及Tris缓冲液,所述的酶底物为葡萄糖-6-磷酸,所述的辅酶为氧化型烟酰胺腺嘌呤二核苷酸;
所述的文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物由上述结构式Ⅰ所示的文拉法辛衍生物与葡萄糖-6-磷酸脱氢酶偶联而成;其结构式如式Ⅲ所示:
所述的R2缓冲液为含有牛血清白蛋白的Tris缓冲液。
具体的,所述文拉法辛均相酶免疫检测试剂的制备方法,包含以下步骤:
(D1)将250.0mg牛血清白蛋白、250.0mg葡萄糖-6-磷酸及50.0mg氧化型烟酰胺腺嘌呤二核苷酸依次加入250mL Tris缓冲液(50mmol/L,pH=8.5)中搅拌溶解制成R1缓冲液,再将抗文拉法辛特异性抗体以1∶1000的体积比加入到上述R1缓冲液中混匀,再用1.0 mol/L的盐酸调节pH至7.6,制成R1试剂;
(D2)将250.0mg牛血清白蛋白加入250mL Tris缓冲液(100mmol/L,pH=8.7)中搅拌溶解制成R2缓冲液,再将文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物以1∶1000的体积比加入到上述R2缓冲液中混匀,再用1.0 mol/L的盐酸调节pH至8.0,制成R2试剂。
所述的文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物的制备方法,包含以下步骤:
(E1)称取20.0 mg活力单位为200KU的葡萄糖-6-磷酸脱氢酶,在室温条件下溶解于50.0mL磷酸钠(100mmol/L,pH=8.0)缓冲液中,然后加入150.0 mg还原态的烟酰胺腺嘌呤二核苷酸、75.0 mg葡萄糖-6-磷酸以及0.75 mL卡必醇,再逐滴加入2.5 mL二甲基亚砜,搅拌溶解,得到葡萄糖-6-磷酸脱氢酶溶液;
(E2)在无水状态下称取15.0 mg上述结构式Ⅰ所示的文拉法辛衍生物,溶解于500.0 µL二甲基甲酰胺中,将上述溶液温度降到0℃后加入4.5 µL三丁胺、2.5 µL氯甲酸异丁酯、3.5 µL N,N′-二环己基碳二亚胺,0℃下搅拌45分钟,得到文拉法辛衍生物激活液;
(E3)将文拉法辛衍生物激活液逐滴加入到葡萄糖-6-磷酸脱氢酶溶液中,-4℃搅拌反应12小时,反应结束后经G-25凝胶层析柱纯化得到文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物。
优选地,上述的抗文拉法辛特异性抗体的应用,所述文拉法辛胶乳增强免疫比浊检测试剂,由L1试剂与L2试剂组成;
所述L1试剂由上述的抗文拉法辛特异性抗体、pH=8.0的缓冲液、牛血清白蛋白、氯化钠、吐温-20、丙三醇、乙二胺四乙酸、促凝剂以及防腐剂组成;
所述L2试剂由文拉法辛-牛血清白蛋白复合体包被的聚苯乙烯胶乳颗粒、pH=8.0的缓冲液、牛血清白蛋白、氯化钠、吐温-20、丙三醇、乙二胺四乙酸以及防腐剂组成;
所述的文拉法辛-牛血清白蛋白复合体由上述结构式Ⅰ所示的文拉法辛衍生物与牛血清白蛋白偶联而成,其结构式如式Ⅳ所示:
所述的聚苯乙烯胶乳颗粒直径范围为50-250nm;
所述的缓冲液为磷酸盐缓冲液、甘氨酸缓冲液、MES缓冲液、硼酸盐缓冲液、Tris-HCl缓冲液或巴比妥缓冲液中的一种;
所述促凝剂为PEG-4000、PEG-6000、PEG-8000或硫酸葡聚糖钠中的一种;
所述防腐剂为叠氮钠、硫柳汞、苯酚或乙基汞硫代硫酸钠中的一种。
具体的,所述文拉法辛胶乳增强免疫比浊检测试剂的制备方法,包含以下步骤:
(F1)将5.0mL的抗文拉法辛特异性抗体溶解于250.0mL磷酸钾缓冲液(50.0 mmol/L pH=8.0)中,然后添加100.0mg牛血清白蛋白、25.0mg氯化钠、250.0μL吐温-20、250.0μL丙三醇、100.0μL的乙二胺四乙酸、150.0μL的PEG-4000以及5.0mg叠氮钠,搅拌均匀,调节pH=7.3,制成L1试剂;
(F2)将1.5mg表面带有羧基的直径为125nm的聚苯乙烯胶乳颗粒加入15.0mL的MES缓冲液(50.0mmol/L,pH=7.0)中,然后加入5.0mg碳二亚胺,在25℃下反应3小时,制成胶乳颗粒溶液,再将1.2mg文拉法辛-牛血清白蛋白复合体用7.5mL的硼酸盐缓冲液(50.0mmol/L,pH=9.2)稀释后,立即加入到上述胶乳颗粒溶液中,在41℃下反应18小时,然后加入3.0mL的甘氨酸缓冲液(100.0mmol/L,pH=8.0)搅拌3小时,反应终止后离心去除上清液,再将沉淀物用20.0mL的Tris-HCl缓冲液(50.0mmol/L,pH=8.0)洗涤3次,再用50.0mL的甘氨酸缓冲液(50.0mmol/L,pH=8.6)稀释成胶乳悬浊液,最后加入质量分数为100.0mg牛血清白蛋白、25.0mg氯化钠、250.0μL吐温-20、250.0μL丙三醇、100.0μL的乙二胺四乙酸以及5.0mg叠氮钠,搅拌均匀,制成L2试剂。
所述的文拉法辛-牛血清白蛋白复合体的制备方法,包含以下步骤:
将10.0mg牛血清白蛋白用7.5mL的磷酸钠缓冲液(100.0mmol/L,pH=7.5)稀释,然后加入100.0mg上述结构式Ⅰ所示的文拉法辛衍生物,再加入50.0mg的1-乙基-3-(3-二甲基氨基丙基)碳二亚胺,在0℃下反应10 小时,再用100.0mL磷酸盐缓冲液(100.0mmol/L,pH=7.5)在-4℃下透析12小时,得到文拉法辛-牛血清白蛋白复合体。
相比现有技术,本发明的有益效果在于:
1、本发明设计的文拉法辛衍生物及其合成方法均为针对性的新设计与研究,在现有技术中并不存在。
、本发明使用经过基因工程改造得到的重组鸡卵清白蛋白与文拉法辛衍生物偶联得到文拉法辛免疫原,偶联效率高,显著提高文拉法辛免疫原的免疫原性。使用本发明的文拉法辛免疫原制备得到的抗文拉法辛特异性抗体的特异性强、灵敏度高,并且与100种常见药物无任何交叉反应,因此能够用于制备具有较高的准确性、精密度、灵敏度和特异性的文拉法辛检测试剂。
、本发明的两种文拉法辛检测试剂可以实现在全自动生化分析仪上对文拉法辛高通量、快速化的检测,能同时测定多个样品,具有操作简便、灵敏度高、特异性强、结果准确等优点,还能有效降低文拉法辛检测成本,有利于临床推广使用。
附图说明
图1为实施例4 文拉法辛的ELISA检测标准曲线;
图2为实施例8文拉法辛均相酶免疫检测试剂校准曲线;
图3为实施例10文拉法辛胶乳增强免疫比浊检测试剂校准曲线。
具体实施方式
下面结合附图以及具体实施方式,对本发明做进一步描述,这些附图均为简化的示意图,仅以示意方式说明本发明的基本结构,因此其仅显示与本发明有关的构成。除非特别指明,以下实施例中所用的试剂、仪器、设备、耗材均可从正规渠道商购买获得。
实施例1:文拉法辛衍生物的合成
通过以下合成路线合成文拉法辛衍生物:
具体的合成步骤如下:
(1)化合物2的合成:
将化合物1 (15 g,57 mmol)与4-溴丁酸乙酯(12 g,62 mmol)共同溶解于含有K2CO3 (9.6 g,70 mmol)的DMF(50 ml)中制成反应混合物,然后将此反应混合物在80℃下搅拌过夜。反应结束后的混合物用乙酸乙酯稀释,再用碳酸氢钠溶液和浓盐水洗涤,并用硫酸钠进行干燥处理。蒸发溶剂后得到7 g白色固体化合物2。
(2)文拉法辛衍生物的合成:
将化合物3(7 g,19 mmol)溶解于MeOH(50 ml)中,然后加入LiOH(1.2 g,30 mmol)制成反应混合溶液,然后将此反应混合溶液在室温下搅拌过夜,然后将溶剂进行减压蒸发,再将残留物通过硅胶层析进行纯化,得到3 g文拉法辛衍生物。
实施例2:文拉法辛免疫原的制备
文拉法辛免疫原的制备方法具体步骤如下:
(1)载体蛋白溶液的制备:将重组鸡卵清白蛋白溶解于0.35mol/L的磷酸钾缓冲液(pH=8.5)中,重组鸡卵清白蛋白的终浓度为5.0mg/mL,得到载体蛋白溶液;
(2)文拉法辛衍生物溶液的制备:将250.0mg上述的文拉法辛衍生物、7.5mL二甲基甲酰胺、7.5mL乙醇、15.0mL的磷酸钾缓冲液(10.0mmol/L,pH=8.0)、150.0mg 1-乙基-3-(-3-二甲氨丙基)碳二亚胺、90.0mg N-羟基硫代琥珀酰亚胺混合,搅拌溶解反应3小时,得到文拉法辛衍生物溶液;
(3)文拉法辛免疫原的合成:将步骤(2)得到的文拉法辛衍生物溶液逐滴加入到步骤(1)得到的载体蛋白溶液中,并在-4℃下搅拌过夜,经透析纯化,得到文拉法辛免疫原。
实施例3:抗文拉法辛特异性抗体的制备
抗文拉法辛特异性抗体的制备方法具体步骤如下:
(1)将上述的文拉法辛免疫原用0.15mol/L磷酸钠缓冲液(pH=7.0)稀释至终浓度为3.5mg/mL,得到人工抗原溶液,然后将3.0mL人工抗原溶液与等量弗氏完全佐剂混合,对实验动物兔子进行多点注射;
(2)4周后,再用3.0mL相同的人工抗原溶液与等量弗氏不完全佐剂对上述实验动物兔子进行多点注射,之后每隔5周注射一次,共计注射6次;
(3)对步骤(2)完成注射的实验动物兔子取血,分离纯化,得到抗文拉法辛特异性抗体。
实施例4:ELISA法检验抗文拉法辛特异性抗体的性能
1.文拉法辛的ELISA检测标准曲线的建立:
(1)标准品的制备:
将文拉法辛纯品粉末(购于Sigma公司) 溶解于甲醇溶液,制备成1mg/mL的储存液。用ELISA缓冲液将储存液依次稀释为1600.00ng/mL、800.00ng/mL、400.00ng/mL、200.00ng/mL、100.00ng/mL、0.00ng/mL的标准溶液。其中,ELISA缓冲液由50.0mmol/L的Tris缓冲液,质量分数为1.5%的NaCl以及体积分数为0.25%的BSA配制而成。
(2)利用文拉法辛的ELISA检验方法制备标准曲线:
用磷酸钾缓冲液(50.0mmol/L,pH=8.0)将实施例3中所制备的抗文拉法辛特异性抗体稀释成1 : 10000的终浓度溶液,100μL/孔包被在96孔酶联板上,4℃放置18小时;用磷酸钾缓冲液将包被有抗文拉法辛特异性抗体的96孔酶联板洗涤3次后,加入200μL/孔的体积分数0.5%的BSA溶液,4℃下放置12小时。然后用磷酸钾缓冲液洗涤3次,加入20μL/孔的标准溶液。再加入100μL/孔工作浓度的HRP-文拉法辛偶联物;室温下孵育30min后磷酸钾缓冲液洗板5次;然后每孔加入100μL的TMB 底物,室温孵育30min。再每孔加入100μL的终止液(2.0mol/L的硫酸)。使用酶标仪测定450nm的吸光值。根据各标准溶液所对应的450nm的吸光值定标,制作标准曲线,结果如图1所示。
待测样品中文拉法辛含量的检测:
(1)制作待测样品:
制备方法:将文拉法辛纯品粉末(购于Sigma公司) 溶解于甲醇溶液制成1.0mg/mL的储存液,并将此储存液稀释于空白血浆中,至终浓度分别为0.00ng/mL、150.00ng/mL、300.00ng/mL、600.00ng/mL,分别形成空白、低、中、高浓度的血浆样本。所述空白血浆为不含文拉法辛的健康人血浆。
(2)测试方法:
利用上述文拉法辛的ELISA检验方法,将上述空白、低、中、高浓度的血浆样本代替标准溶液,测试上述空白、低、中、高浓度的血浆样本在450nm的吸光值。
(3)测试结果:
对照图1中所示的文拉法辛的ELISA检验的标准曲线,计算每个样本中文拉法辛含量,并对每个样本进行3个复孔测定,根据上述样本中文拉法辛的实际含量计算回收率,结果如表1所示。
表1 文拉法辛的ELISA检测结果
血浆样本 | 空白 | 低值 | 中值 | 高值 |
样本浓度(ng/mL) | 0.00 | 150.00 | 300.00 | 600.00 |
测定1 | 0.00 | 150.03 | 303.99 | 602.80 |
测定2 | 0.00 | 152.52 | 299.26 | 595.74 |
测定3 | 0.00 | 151.37 | 302.00 | 610.21 |
平均值(ng/mL) | 0.00 | 151.31 | 301.75 | 602.92 |
回收率(%) | - | 100.87 | 100.58 | 100.49 |
由表1中结果可知:使用本发明文拉法辛特异性抗体的ELISA检测方法测定不同浓度样本中的文拉法辛回收率都较高,均在97%-103%之间,说明本发明所述的抗文拉法辛特异性抗体可以用于样本中文拉法辛的检测,并且灵敏度高,检测结果准确度高。
实施例5:100种常见药物干扰试验
选取100种常见药物作为干扰物进行干扰试验,将100种常见药物纯品粉末配制成浓度为100.0μg/mL的溶液作为待测干扰物样本,采用实施例4的ELISA检验方法对相应干扰物的浓度进行检测,100种常见药物名称以及检测结果详见表2。
表2 常见药物干扰试验检测结果
序号 | 化合物名称 | 实际检测值(ng/mL) | 序号 | 化合物名称 | 实际检测值 (ng/mL) |
1 | 阿司匹林 | 0.00 | 2 | 苯丙醇胺 | 0.00 |
3 | β-苯基乙胺 | 0.00 | 4 | 普鲁卡因酰胺 | 0.00 |
5 | 安非他命 | 0.00 | 6 | 普鲁卡因 | 0.00 |
7 | 氨苄青霉素 | 0.00 | 8 | 奎尼丁 | 0.00 |
9 | 甲氨二氮卓 | 0.00 | 10 | 佐美酸 | 0.00 |
11 | 氯丙嗪 | 0.00 | 12 | 苯肾上腺素 | 0.00 |
13 | 氯拉卓酸 | 0.00 | 14 | 桂皮酰艾克宁 | 0.00 |
15 | 二甲苯氧庚酸 | 0.00 | 16 | 芽子碱 | 0.00 |
17 | 非诺洛芬 | 0.00 | 18 | 地西洋 | 0.00 |
19 | 甲基苯丙胺 | 0.00 | 20 | 可替宁 | 0.00 |
21 | 龙胆酸 | 0.00 | 22 | 阿替洛尔 | 0.00 |
23 | 吉非贝齐 | 0.00 | 24 | 心得安 | 0.00 |
25 | 氢可酮 | 0.00 | 26 | 苯乙哌啶酮 | 0.00 |
27 | 布洛芬 | 0.00 | 28 | 苯基丁氮酮 | 0.00 |
29 | 丙咪嗪 | 0.00 | 30 | 麦角酸二乙基酰胺 | 0.00 |
31 | 二氨基二苯砜 | 0.00 | 32 | 大麻酚 | 0.00 |
33 | 萘普生 | 0.00 | 34 | 洛哌丁胺 | 0.00 |
35 | 氢氯噻嗪 | 0.00 | 36 | 异克舒令 | 0.00 |
37 | 哌替啶 | 0.00 | 38 | 苯基丙氨酸 | 0.00 |
39 | 烯丙羟吗啡酮 | 0.00 | 40 | 盐酸氟西汀 | 0.00 |
41 | 麻黄素 | 0.00 | 42 | 柳丁氨醇 | 0.00 |
43 | 烟酰胺 | 0.00 | 44 | 青霉素 | 0.00 |
45 | 甲胺呋硫 | 0.00 | 46 | 甲基二乙醇胺 | 0.00 |
47 | 异戊巴比妥 | 0.00 | 48 | 二亚甲基双氧苯丙胺 | 0.00 |
49 | 甲撑二氧苯丙胺 | 0.00 | 50 | 琥珀酸多西拉敏 | 0.00 |
51 | 四氢大麻酚 | 0.00 | 52 | 纳布啡 | 0.00 |
53 | 制霉菌素 | 0.00 | 54 | 去甲吗啡 | 0.00 |
55 | 乙酰吗啡 | 0.00 | 56 | 羟考酮 | 0.00 |
57 | 苄非他明 | 0.00 | 58 | 克他命 | 0.00 |
59 | 异丙嗪 | 0.00 | 60 | 苯海拉明 | 0.00 |
61 | 阿司帕坦 | 0.00 | 62 | 苯丁胺 | 0.00 |
63 | 阿立哌唑 | 0.00 | 64 | 氟康唑 | 0.00 |
65 | 氯氮平 | 0.00 | 66 | 呋塞米 | 0.00 |
67 | 艾司西酞普兰 | 0.00 | 68 | 加巴喷丁 | 0.00 |
69 | 伊马替尼 | 0.00 | 70 | 华法林 | 0.00 |
71 | 拉莫三嗪 | 0.00 | 72 | 瑞舒伐他汀 | 0.00 |
73 | 利奈唑胺 | 0.00 | 74 | 对乙酰氨基酚 | 0.00 |
75 | 利培酮 | 0.00 | 76 | 舒必利 | 0.00 |
77 | 舍曲林 | 0.00 | 78 | 氟伏沙明 | 0.00 |
79 | 托吡酯 | 0.00 | 80 | 氟西汀 | 0.00 |
81 | 奥卡西平 | 0.00 | 82 | 齐拉西酮 | 0.00 |
83 | 伏立康唑 | 0.00 | 84 | 氟哌啶醇 | 0.00 |
85 | 左乙拉西坦 | 0.00 | 86 | 亚胺培南 | 0.00 |
87 | 奥氮平 | 0.00 | 88 | 阿昔替尼 | 0.00 |
89 | 唑尼沙胺 | 0.00 | 90 | 培唑帕尼 | 0.00 |
91 | 阿米替林 | 0.00 | 92 | 瑞戈非尼 | 0.00 |
93 | 氯丙嗪 | 0.00 | 94 | 异烟肼 | 0.00 |
95 | 多虑平 | 0.00 | 96 | 利福平 | 0.00 |
97 | 帕罗西汀 | 0.00 | 98 | 左氧氟沙星 | 0.00 |
99 | 氯霉素 | 0.00 | 100 | 莫西沙星 | 0.00 |
测定结果显示:采用实施例4的ELISA检验方法对相应干扰物的浓度进行检测,上述100种常见药物实际检测值均为0.00ng/mL。由此可见,本发明的抗文拉法辛特异性抗体具有较强的抗原识别特异性,与100种常见药物无任何交叉反应。
实施例6:文拉法辛均相酶免疫检测试剂的制备
文拉法辛均相酶免疫检测试剂的制备方法,具体步骤如下:
(1)将250.0mg牛血清白蛋白、250.0mg葡萄糖-6-磷酸及50.0mg氧化型烟酰胺腺嘌呤二核苷酸依次加入250mL Tris缓冲液(50mmol/L,pH=8.5)中搅拌溶解制成R1缓冲液,再将抗文拉法辛特异性抗体以1∶1000的体积比加入到上述R1缓冲液中混匀,再用1.0 mol/L的盐酸调节pH至7.6,制成R1试剂;
(2)将250.0mg牛血清白蛋白加入250mL Tris缓冲液(100mmol/L,pH=8.7)中搅拌溶解制成R2缓冲液,再将文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物以1∶1000的体积比加入到上述R2缓冲液中混匀,再用1.0 mol/L的盐酸调节pH至8.0,制成R2试剂。
所述的文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物的制备方法,包含以下步骤:
(1)称取20.0 mg活力单位为200KU的葡萄糖-6-磷酸脱氢酶,在室温条件下溶解于50.0mL磷酸钠(100mmol/L,pH=8.0)缓冲液中,然后加入150.0 mg还原态的烟酰胺腺嘌呤二核苷酸、75.0 mg葡萄糖-6-磷酸以及0.75 mL卡必醇,再逐滴加入2.5 mL二甲基亚砜,搅拌溶解,得到葡萄糖-6-磷酸脱氢酶溶液;
(2)在无水状态下称取15.0 mg实施例1合成的文拉法辛衍生物,溶解于500.0 µL二甲基甲酰胺中,将上述溶液温度降到0℃后加入4.5 µL三丁胺、2.5 µL氯甲酸异丁酯、3.5µL N,N′-二环己基碳二亚胺,0℃下搅拌45分钟,得到文拉法辛衍生物激活液;
(3)将文拉法辛衍生物激活液逐滴加入到葡萄糖-6-磷酸脱氢酶溶液中,-4℃搅拌反应12小时,反应结束后经G-25凝胶层析柱纯化得到文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物。
实施例7:文拉法辛校准品、质控品的制备
(1)校准品的制备:将文拉法辛纯品粉末分别加入6份浓度为50.0mmol/L pH=7.2的Tris-HCl缓冲液中,搅拌溶解,至终浓度分别为0.00ng/mL、100.00ng/mL、200.00ng/mL、400.00ng/mL、800.00ng/mL、1600.00ng/mL,然后在每份溶液中分别加入质量分数为0.5%的氯化钠、1.0%的牛血清白蛋白、0.75%的乙二胺四乙酸、0.05%的叠氮钠,搅拌均匀,即为文拉法辛校准品(6个浓度)。
(2)质控品的制备:将文拉法辛纯品粉末分别加入4份浓度为50.0mmol/L pH=7.2的Tris-HCl缓冲液中,搅拌溶解,至终浓度分别为0.00ng/mL、150.00ng/mL、300.00ng/mL、600.00ng/mL,然后在每份溶液中分别加入质量分数为0.5%的氯化钠、1.0%的牛血清白蛋白、0.75%的乙二胺四乙酸、0.05%的叠氮钠,搅拌均匀,即为文拉法辛质控品(4个浓度)。
实施例8:文拉法辛均相酶免疫检测试剂校准曲线制作及质控实验
1. 制作文拉法辛均相酶免疫检测校准曲线:
在迈瑞 BS480全自动生化分析仪中放入R1试剂、R2试剂及校准品,然后对生化分析仪进行反应参数设置,具体参数详见表3;实际操作过程中需不断调整R1试剂和R2试剂的体积比例,同时调整测光点,最后由生化分析仪自动得出均相酶免疫检测校准曲线,如图2所示。
表3 迈瑞 BS480全自动生化分析仪反应参数设置
项目名称 | 文拉法辛 |
R1试剂 | 160.0µL |
R2试剂 | 40.0µL |
样本量 | 10.0µL |
定标方法 | 两点终点法 |
主波长 | 340nm |
次波长 | 405nm |
反应时间 | 10分钟 |
温育时间 | 8分钟 |
反应方向 | 上升 |
结果 | ng/mL |
结果精度 | 0.01 |
拟合方法 | Line graph |
校准品浓度 | 0.00ng/mL、100.00ng/mL、200.00ng/mL、400.00ng/mL、800.00ng/mL、1600.00ng/mL |
2. 质控品检测实验:
利用上述的文拉法辛均相酶免疫检测方法,对质控品进行测定,并根据步骤1中制作的均相酶免疫检测校准曲线,计算每个质控品中文拉法辛的含量,每个质控品重复测定10次,检测结果及数据分析详见表4。
表4 文拉法辛均相酶免疫检验试剂检测结果及数据分析
质控品 | 空白 | 低值 | 中值 | 高值 |
浓度 (ng/mL) | 0.00 | 150.00 | 300.00 | 600.00 |
测试1 | 0.00 | 152.07 | 303.27 | 600.15 |
测试2 | 0.00 | 147.41 | 300.00 | 608.71 |
测试3 | 0.00 | 148.12 | 297.33 | 592.44 |
测试4 | 0.00 | 149.00 | 295.98 | 599.80 |
测试5 | 0.00 | 150.10 | 304.12 | 603.00 |
测试6 | 0.00 | 151.22 | 300.65 | 602.73 |
测试7 | 0.00 | 151.51 | 301.73 | 598.05 |
测试8 | 0.00 | 149.22 | 301.90 | 592.61 |
测试9 | 0.00 | 150.88 | 299.99 | 597.43 |
测试10 | 0.00 | 151.06 | 302.54 | 606.75 |
平均值(ng/mL) | 0.00 | 150.06 | 300.75 | 600.17 |
标准差(SD) | / | 1.56 | 2.56 | 5.37 |
精密度(CV%) | / | 1.04 | 0.85 | 0.90 |
回收率(%) | / | 100.04 | 100.25 | 100.03 |
实验结果表明:测定不同浓度质控品中文拉法辛含量的CV值均低于5%,回收率均在95%-105%之间,说明本发明的文拉法辛均相酶免疫检测试剂测定生物样本中文拉法辛含量的精密度较高,结果准确。
实施例9:文拉法辛胶乳增强免疫比浊检测试剂的制备
文拉法辛胶乳增强免疫比浊检测试剂的制备方法,包含以下步骤:
(F1)将5.0mL的抗文拉法辛特异性抗体溶解于250.0mL磷酸钾缓冲液(50.0 mmol/L pH=8.0)中,然后添加100.0mg牛血清白蛋白、25.0mg氯化钠、250.0μL吐温-20、250.0μL丙三醇、100.0μL的乙二胺四乙酸、150.0μL的PEG-4000以及5.0mg叠氮钠,搅拌均匀,调节pH=7.3,制成L1试剂;
(F2)将1.5mg表面带有羧基的直径为125nm的聚苯乙烯胶乳颗粒加入15.0mL的MES缓冲液(50.0mmol/L,pH=7.0)中,然后加入5.0mg碳二亚胺,在25℃下反应3小时,制成胶乳颗粒溶液,再将1.2mg文拉法辛-牛血清白蛋白复合体用7.5mL的硼酸盐缓冲液(50.0mmol/L,pH=9.2)稀释后,立即加入到上述胶乳颗粒溶液中,在41℃下反应18小时,然后加入3.0mL的甘氨酸缓冲液(100.0mmol/L,pH=8.0)搅拌3小时,反应终止后离心去除上清液,再将沉淀物用20.0mL的Tris-HCl缓冲液(50.0mmol/L,pH=8.0)洗涤3次,再用50.0mL的甘氨酸缓冲液(50.0mmol/L,pH=8.6)稀释成胶乳悬浊液,最后加入质量分数为100.0mg牛血清白蛋白、25.0mg氯化钠、250.0μL吐温-20、250.0μL丙三醇、100.0μL的乙二胺四乙酸以及5.0mg叠氮钠,搅拌均匀,制成L2试剂。
所述的文拉法辛-牛血清白蛋白复合体的制备方法,包含以下步骤:
将10.0mg牛血清白蛋白用7.5mL的磷酸钠缓冲液(100.0mmol/L,pH=7.5)稀释,然后加入100.0mg实施例1合成的文拉法辛衍生物,再加入50.0mg的1-乙基-3-(3-二甲基氨基丙基)碳二亚胺,在0℃下反应10 小时,再用100.0mL磷酸盐缓冲液(100.0mmol/L,pH=7.5)在-4℃下透析12小时,得到文拉法辛-牛血清白蛋白复合体。
实施例10:文拉法辛胶乳增强免疫比浊检测试剂校准曲线制作及质控实验
1. 制作文拉法辛胶乳增强免疫比浊检测试剂校准曲线:
在奥林巴斯AU480全自动生化分析仪中放入L1试剂、L2试剂及校准品,然后对生化分析仪进行反应参数设置,具体参数详见表5;实际操作过程中需不断调整L1试剂和L2试剂的体积比例,同时调整测光点,最后由生化分析仪自动得出胶乳增强免疫比浊检测校准曲线,如图3所示。
表5 奥林巴斯AU480全自动生化分析仪反应参数
项目名称 | 文拉法辛 |
L1试剂 | 160.0µL |
L2试剂 | 40.0µL |
样本量 | 10.0µL |
定标方法 | 两点终点法 |
主波长 | 570nm |
次波长 | 412nm |
反应时间 | 10分钟 |
温育时间 | 5分钟 |
反应方向 | 下降 |
结果 | ng/mL |
结果精度 | 0.01 |
拟合方法 | Logit-log 4P |
校准品浓度 | 0.00ng/mL、100.00ng/mL、200.00ng/mL、400.00ng/mL、800.00ng/mL、1600.00ng/mL |
2. 质控品检测实验:
利用上述的胶乳增强免疫比浊检测方法,对质控品进行测定,并根据步骤1中制作的胶乳增强免疫比浊检测校准曲线,计算每个质控品中文拉法辛的含量,每个质控品重复测定10次,检测结果及数据分析详见表6。
表6 文拉法辛胶乳增强免疫比浊试剂检测结果及数据分析
质控品 | 空白 | 低值 | 中值 | 高值 |
浓度 (ng/mL) | 0.00 | 150.00 | 300.00 | 600.00 |
测试1 | 0.00 | 153.28 | 304.01 | 603.72 |
测试2 | 0.00 | 151.77 | 302.19 | 605.29 |
测试3 | 0.00 | 150.90 | 298.87 | 612.00 |
测试4 | 0.00 | 148.54 | 299.00 | 597.35 |
测试5 | 0.00 | 151.29 | 303.03 | 601.84 |
测试6 | 0.00 | 150.33 | 301.11 | 605.05 |
测试7 | 0.00 | 150.00 | 300.50 | 600.51 |
测试8 | 0.00 | 148.96 | 302.60 | 601.16 |
测试9 | 0.00 | 149.91 | 298.26 | 598.88 |
测试10 | 0.00 | 151.78 | 303.56 | 600.12 |
平均值(ng/mL) | 0.00 | 150.68 | 301.31 | 602.59 |
标准差(SD) | / | 1.43 | 2.08 | 4.18 |
精密度(CV%) | / | 0.95 | 0.69 | 0.69 |
回收率(%) | / | 100.45 | 100.44 | 100.43 |
实验结果表明:测定不同浓度质控品中文拉法辛含量的CV值均低于5%,回收率均在95%-105%之间,说明本发明的文拉法辛胶乳增强免疫比浊检测试剂测定生物样本中文拉法辛含量的精密度较高,结果准确。
对于本领域的技术人员来说,可根据以上描述的技术方案以及构思做出其它各种相应的变更以及修改,而所有的这些变更以及修改都应该属于本发明权利要求的保护范围之内。
序列表
<110> 湖南苏阳医疗科技有限公司
<120> 一种文拉法辛衍生物、免疫原、抗文拉法辛特异性抗体及其制备方法与应用
<130> 2020.12.13
<160> 1
<170> SIPOSequenceListing 1.0
<210> 1
<211> 386
<212> PRT
<213> 人工合成(Artificial Sequence)
<400> 1
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His Lys Ser Leu Arg Asp Ile Leu Asn Gln Ile Thr Lys Pro Asn Asp
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Pro Ile Leu Pro Glu Tyr Leu Gln Cys Val Lys Glu Leu Tyr Arg Gly
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Leu Ile Asn Ser Trp Val Glu Ser Gln Thr Asn Gly Ile Ile Arg Asn
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Claims (10)
4.根据权利要求3所述的文拉法辛免疫原,其特征在于,所述重组鸡卵清白蛋白的氨基酸序列如序列表SEQ ID NO:1所示。
5.一种如权利要求3-4任一项所述的文拉法辛免疫原的制备方法,其特征在于,所述制备方法包括以下步骤:
(B1)载体蛋白溶液的制备:将权利要求3-4任一项中所述的重组鸡卵清白蛋白溶解于磷酸盐缓冲液中,得到载体蛋白溶液;
(B2)文拉法辛衍生物溶液的制备:将权利要求1所述的文拉法辛衍生物与二甲基甲酰胺、乙醇、磷酸钾缓冲液、1-乙基-3-(-3-二甲氨丙基)碳二亚胺和N-羟基硫代琥珀酰亚胺混合,搅拌溶解,得到文拉法辛衍生物溶液;
(B3)文拉法辛免疫原的合成:将步骤(B2)得到的文拉法辛衍生物溶液加入到步骤(B1)得到的载体蛋白溶液中,搅拌反应,经透析纯化,得到文拉法辛免疫原。
6.一种抗文拉法辛特异性抗体,其特征在于,所述抗文拉法辛特异性抗体为使用权利要求3-4任一项所述的文拉法辛免疫原对实验动物进行注射后所得到的特异性抗体,所述的实验动物为兔子、山羊、绵羊、小鼠、大鼠、豚鼠或马中的一种。
7.一种如权利要求6所述的抗文拉法辛特异性抗体的制备方法,其特征在于,所述制备方法包含以下步骤:
(C1)将权利要求3-4任一项所述的文拉法辛免疫原用磷酸盐缓冲液稀释,得到文拉法辛人工抗原溶液,然后将文拉法辛人工抗原溶液与等量弗氏完全佐剂混合,对权利要求6中所述的实验动物进行多点注射;
(C2)3-6周后,再用相同的文拉法辛人工抗原溶液与等量弗氏不完全佐剂混合,对上述实验动物进行多点注射,之后每隔3-6周注射一次,共计注射3-10次;
(C3)对步骤(C2)中完成注射的实验动物取血,分离纯化,得到抗文拉法辛特异性抗体。
8.如权利要求6-7任一项所述的抗文拉法辛特异性抗体的应用,其特征在于,将所述抗文拉法辛特异性抗体用于制备文拉法辛检测试剂,所述文拉法辛检测试剂包括文拉法辛均相酶免疫检测试剂与文拉法辛胶乳增强免疫比浊检测试剂。
9.根据权利要求8所述的抗文拉法辛特异性抗体的应用,其特征在于,所述文拉法辛均相酶免疫检测试剂,由R1试剂与R2试剂组成,所述R1试剂包含权利要求6-7任一项所述的抗文拉法辛特异性抗体与R1缓冲液,所述R2试剂包含文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物与R2缓冲液;
所述的R1缓冲液含有酶底物、辅酶、牛血清白蛋白及Tris缓冲液,所述的酶底物为葡萄糖-6-磷酸,所述的辅酶为氧化型烟酰胺腺嘌呤二核苷酸;
所述的文拉法辛葡萄糖-6-磷酸脱氢酶标记偶联物由权利要求1所述的文拉法辛衍生物与葡萄糖-6-磷酸脱氢酶偶联而成;其结构式如式Ⅲ所示:
所述的R2缓冲液为含有牛血清白蛋白的Tris缓冲液。
10.根据权利要求8所述的抗文拉法辛特异性抗体的应用,其特征在于,所述文拉法辛胶乳增强免疫比浊检测试剂,由L1试剂与L2试剂组成;
所述L1试剂由权利要求6-7任一项所述的抗文拉法辛特异性抗体、pH=8.0的缓冲液、牛血清白蛋白、氯化钠、吐温-20、丙三醇、乙二胺四乙酸、促凝剂以及防腐剂组成;
所述L2试剂由文拉法辛-牛血清白蛋白复合体包被的聚苯乙烯胶乳颗粒、pH=8.0的缓冲液、牛血清白蛋白、氯化钠、吐温-20、丙三醇、乙二胺四乙酸以及防腐剂组成;
所述的文拉法辛-牛血清白蛋白复合体由权利要求1所述的文拉法辛衍生物与牛血清白蛋白偶联而成,其结构式如式Ⅳ所示:
所述的聚苯乙烯胶乳颗粒直径范围为50-250nm;
所述的缓冲液为磷酸盐缓冲液、甘氨酸缓冲液、MES缓冲液、硼酸盐缓冲液、Tris-HCl缓冲液或巴比妥缓冲液中的一种;
所述促凝剂为PEG-4000、PEG-6000、PEG-8000或硫酸葡聚糖钠中的一种;
所述防腐剂为叠氮钠、硫柳汞、苯酚或乙基汞硫代硫酸钠中的一种。
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