CN1987466B - 微孔板pH传感器的原位制备方法 - Google Patents

微孔板pH传感器的原位制备方法 Download PDF

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CN1987466B
CN1987466B CN2006101255499A CN200610125549A CN1987466B CN 1987466 B CN1987466 B CN 1987466B CN 2006101255499 A CN2006101255499 A CN 2006101255499A CN 200610125549 A CN200610125549 A CN 200610125549A CN 1987466 B CN1987466 B CN 1987466B
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CN1987466A (zh
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何治柯
刘红兵
梁润松
黄国贤
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Changshu Zijin Intellectual Property Service Co., Ltd.
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Wuhan University WHU
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Abstract

本发明公开了一种微孔板pH传感器的原位制备方法,其步骤是首先将三乙氧基-3-异氰酸丙基硅烷滴入pH敏感试剂的乙醇溶液中,得反应液A;其次是将硅氧烷、酸和水混合,得反应液B;第三是取反应液A、反应液B及氯化钙溶液,按比例混合,得溶液C;第四是取溶液C涂于微孔板的微孔底部,用密封带将微孔封住,并用针在每个微孔中央刺孔,避光保存。放置一段时间后加蒸馏水于微孔中,保存备用。本方法简便快速,成本低,通用性强,该传感器可用于各种水解反应及与pH变化有关的化学反应的监测。用于β-内酰胺酶抑制剂及β-内酰胺抗生素筛选获得满意结果。

Description

微孔板pH传感器的原位制备方法
技术领域
本发明涉及生物、医学、药学、材料、化学等学科的交叉学科领域。更具体涉及一种微孔板底部pH传感器的制备方法。
背景技术
β-内酰胺类抗生素,如青霉素及链霉素等,是最常用的抗生素。由于在临床治疗及动物饲养等方面的广泛使用,甚至滥用,抗药性问题日益突出,甚至对继续使用抗生素治疗带来严重威胁。抗药性产生的原因是由于细菌产生β-内酰胺酶。随着抗生素的不断使用,新的酶及变种酶不断产生,抗药性问题日趋严重。
β-内酰胺酶(E.C.3.5.2.6)是一类β-内酰胺水解酶,它催化水解β-内酰胺环,酰胺键断裂,生成β-氨基酸。最新研究成果表明,目前已经证实的β-内酰胺酶共有340余种。根据它们氨基酸序列及催化机理的不同,这些酶可分为A,B,C,D4类。
目前常用于酶活性测定的方法主要是紫外-可见分光光度法,由于这种方法灵敏度低,因而采用微孔板进行高通量检测受到限制,劳动强度大,耗时长,影响分析结果。另外,对于米氏常数过大及催化效率过低的酶,由于底物或酶浓度高,严重干扰紫外-可见分光光度分析。米氏常数过小,初始速率测定有困难,也会干扰紫外-可见分光光度分析。
高通量微孔板常用于大量样品的高通量检测,但由于微孔板多为塑料制品,如聚苯乙烯微孔板。聚苯乙烯透光性强、易成型、成本低、经久耐用,发光测定通常采用聚苯乙烯微孔板。但由于聚苯乙烯表面亲水性差,对酶等生物大分子物理吸附强,严重影响分析结果。因此聚苯乙烯微孔板内表面须进行亲水处理。常用的方法有:等离子处理法、光化学氧化、化学氧化及涂层。等离子处理,如离子轰击与植入、电子束辐射等方法均需要特定的设备,成本高;光化学氧化及化学氧化需采用强酸及强氧化剂、紫外线照射等,对环境污染较大。因而微孔板内涂层法成为一种简便、适用的表面改性技术。
发明内容
本发明的目的在于提供一种微孔板pH传感器的原位制备方法。采用pH敏感分子与凝胶共价偶联技术,该传感膜性质稳定,对pH变化响应快,亲水性好,灵敏度高,通用性强。
为了实现上述目的,本发明采用以下技术措施:
其步骤如下:
将1-10μL的三乙氧基—3异氰酸丙基硅烷(TESPI)滴入pH敏感试剂5-氨基荧光素(FITC)的乙醇溶液中,TESPI与FITC的摩尔比控制在为1:1~1:20范围内,温度在5-50℃,反应1-30小时,得反应液A,所偶联的pH敏感试剂可以是FITC;(2)将硅氧烷、0.01M酸和水按1:1:3~10:1:3比例混合,超声0.2~2.0小时,得反应液B,硅氧烷为四甲氧基硅烷或四乙氧基硅烷,酸为盐酸或硫酸或硝酸或磷酸等;(3)取反应液A,反应液B及0.1M氯化钙(CaCl2)溶液,按10:10:1~1:1:10的比例混合,得溶液C;(4)取溶液C1.-0~50μL于96(384或1856)孔板的微孔中,涂于微孔底部,然后用密封带将微孔封住,并用针在每个微孔板中央刺一小孔,室温(20—25℃)保存20~120小时后,加适量蒸馏水于微孔中,保存备用。传感器放置一年以上,性能基本不变(见图1~5)。本传感器用于7种商用抗生素筛选及2种细菌酶抑制剂筛选研究,可在半小时内完成。
抗生素药物的筛选:在0.1mL一定浓度的β-内酰胺酶和0.1MNaCl溶液中注入0.1mL的不同抗生素,根据荧光强度的变化,便可判断不同β-内酰胺酶可以水解的抗生素(见表1)。
表1抗生素药物的筛选结果
√:β-内酰胺酶能水解               -:β-内酰胺酶不能水解
β-内酰胺酶抑制剂的筛选:取适量β-内酰胺酶与β-内酰胺酶抑制剂混和溶液0.1mL于微孔中,将微孔板放入微孔板读数仪,再将0.1mL一定浓度的抗生素药物注射到微孔中,记录荧光强度变化曲线,根据该曲线变化即可进行抗生素药物和β-内酰胺酶抑制剂的筛选。(见表2)
表2β-内酰胺酶抑制剂的筛选结果
Figure S061C5549920070109D000041
本发明与现有技术相比,具有以下优点和效果:
从pH7.0变到pH4.0所需时间约2分钟;荧光强度增大约7倍;(通常的文献方法只能增强2~3倍)。传感器连续使用40天后,荧光强度偏差在10%以内。传感器放置一年以上,性能基本不变。本传感器用于7种商用抗生素筛选及2种细菌酶抑制剂筛选研究,可在半小时内完成。与传统的紫外分光光度法相比,分析速度大大提高,灵敏度可提高10~100倍。此外对于米氏常数较大或较小,因而无法采用紫外可见分光光度法测定的酶、颜色较深的培养液及高背景介质,对本传感器的分析应用无干扰。
附图说明
图1为溶液pH变化对荧光强度的影响
pH4.0,5.0:0.05M邻苯二甲酸缓冲溶液
pH6.0,7.0,8.0:0.05M磷酸缓冲溶液
pH9.0:12.5mM硼砂缓冲溶液
图2A、2B为传感器对pH变化的响应特性及可逆性
图2A为0.2mM pH7.0磷酸缓冲溶液平衡后注入0.05M pH4.0邻苯二甲酸缓冲溶液,
图2B为0.05M pH4.0邻苯二甲酸缓冲溶液平衡后注入0.05M pH7.0磷酸缓冲溶液
图3为传感膜的激发及发射光谱
激发波长480nm,发射波长485nm
图4为青霉素浓度变化对荧光强度的影响
0.1mL2.8×10-7M青霉素酶和0.1M NaCl溶液中注入0.1mL不同浓度的青霉素
图5为不同浓度青霉素酶的反应动力学曲线
0.1mL2.5nM(a)和5.0nM(b)青霉素酶和0.1M NaCl溶液中注入0.1mL10mM的青霉素溶液
具体实施方式
一种微孔板pH传感器的原位制备方法,其步骤为:
(1)将10μL的三乙氧基—3异氰酸丙基硅烷(TESPI)滴入pH敏感试剂5-氨基荧光素(FITC)的乙醇溶液中,TESPI与FITC的摩尔比控制在为1:14,温度在5或10或15或20或25或28或31或33或36或41或46或50℃,反应1或3或5或10或15或20或24或28或30小时,得反应液A;
(2)将四乙氧基硅烷0.6mL、0.01M盐酸40μL和水0.12mL混合均匀,超声1或1.5或2小时,得反应液B;
(3)取反应液A0.2mL,反应液B0.2mL及0.1M氯化钙(CaCl2)溶液1.0mL混合均匀,得溶液C;
(4)取溶液C1.0或5或10或15或20或30或40或50μL于96或384或1856孔板底部涂匀,用密封带将微孔封住,并用针在每个微孔板中央刺一小孔,室温20℃保存20或24或48或72或96或115或120小时后,加0.2mL蒸馏水于微孔中,保存备用。

Claims (3)

1.一种微孔板pH传感器的原位制备方法,其特征在于该方法包括如下步骤:
(1)将1-10μL的三乙氧基-3-异氰酸丙基硅烷滴入pH敏感试剂的乙醇溶液中,摩尔比为1∶1~1∶20,温度在5-50℃,反应1~30小时,得反应液A,所述的pH敏感试剂是FITC;
(2)将硅氧烷、0.01M酸和水按1∶1∶3~10∶1∶3比例混合,超声0.2~2小时,得反应液B,所述的硅氧烷为四甲氧基硅烷或四乙氧基硅烷;
(3)取反应液A、反应液B及0.1M氯化钙溶液,按10∶10∶1~1∶1∶10的比例混合,得溶液C;
(4)取溶液C 1.0~50μL于96或384或1856孔板底部,用密封带将微孔板的微孔封住,并用针在每个微孔中央刺一小孔,室温保存20~120小时后,加蒸馏水于微孔中,保存备用。
2.根据权利要求1所述的一种微孔板pH传感器的原位制备方法,其特征在于:微孔板为聚苯乙烯微孔板或玻璃微孔板。
3.根据权利要求1所述的一种微孔板pH传感器的原位制备方法,其特征在于:酸为盐酸或者是硫酸、硝酸、磷酸。 
CN2006101255499A 2006-12-22 2006-12-22 微孔板pH传感器的原位制备方法 Expired - Fee Related CN1987466B (zh)

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CN103543150B (zh) * 2013-09-03 2015-11-04 郑州大学 一种凝胶基pH传感器及其制备方法
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CN109632674A (zh) * 2019-01-29 2019-04-16 厦门鲎试剂生物科技股份有限公司 一种检测样品pH值的方法

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CN1712940A (zh) * 2005-08-02 2005-12-28 武汉大学 基于水溶性共轭聚合物的荧光传感器制备方法

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