CN103638693B - 一种管内固相微萃取柱的制备方法 - Google Patents
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Abstract
一种管内固相微萃取柱及其制备方法,属于分析化学样品前处理技术领域。所述管内固相微萃取柱由石英毛细管和氧化石墨烯涂层组成,氧化石墨烯涂层是通过化学键合固定在石英毛细管内壁上。制备时,石英毛细管内壁依次用酸洗、碱洗、氮气吹干,将3-氨丙基三乙氧基硅烷(APTES)的甲苯溶液灌入毛细管内,两端密封置于水浴中进行反应,然后将1-乙基-3-(3-二甲基氨丙基)-碳化二亚胺/N-羟基琥珀酰亚胺(EDC/NHS)活化的氧化石墨烯水溶液灌入毛细管内,两端密封于水浴中进行反应,使氧化石墨烯键合到石英毛细管壁上,获得管内固相微萃取柱。本发明的管内固相微萃取柱制备方法简单、快速,石墨烯涂层化学、机械和热稳定好、萃取容量高,使用寿命长,在分析化学、环境分析领域有广阔的应用前景。
Description
技术领域
本发明公开了一种管内固相微萃取柱的制备方法,主要用于复杂水溶液样品中目标物的分离、富集,属于分析化学样品前处理技术领域。
背景技术
前处理是复杂样品分析的重要步骤。通过前处理,去除试样中的干扰物质并浓缩目标物,以弥补现有分离技术和仪器检测灵敏度的不足。环境样品分析大致分为4个步骤:①样品采集,②样品前处理,③分析测定,④数据处理。对具有复杂基体的品分析,样品前处理花费的时间往往占到整个分析过程的三分之二甚至更多。随着仪器水平和分析技术的不断提高,样品前处理已成为制约整个分析过程的瓶颈。固相微萃取(SPME)是一种较新的样品前处理技术。与传统的样品前处理技术如液液萃取、索氏提取、固相萃取等相比,SPME具有样品用量少、处理时间短、操作简单、无二次污染等优点。SPME主要有两种模式:针尖式SPME和管内SPME。相对于针尖式SPME,管内SPME可以使用较大的涂层体积,因而能够获得更大的富集倍数,此外,管内SPME易于与气相色谱、液相色谱和毛细管电泳耦合实现在线富集、分析。
SPME是基于目标化合物在萃取涂层(固定相)和溶液间的分配完成的,因此,纤维涂层是SPME的关键。目前,针尖式SPME和管内SPME的萃取涂层主要是高分子聚合物,如聚二甲基硅氧烷(PDMS)、聚二甲基硅氧烷/二乙烯基苯(PDMS/DVB)、丙烯酰胺(PA)、聚乙二醇/聚二甲基硅氧烷(CAR/PDMS)和分子印迹聚合物等。此外,也有报道将碳纳米管、介孔材料通过物理吸附固定在铂丝、石英毛细管表面,应用于针尖式SPME萃取。
石墨烯是近年新发现一种由碳原子构成的单层片状结构的新材料,具有极高的比表面积(2630m2/g)。石墨烯具有大π电子结构,同时未还原的石墨烯即氧化石墨烯表面具有丰富的羧基、羰基和环氧基等亲水基团,因此,理论上石墨烯对具有π电子的物质或亲水性化合物具有很好的吸附特性。Jiang等人将石墨烯固定在硅胶颗粒表面对多溴代联苯醚进行萃取(QLiu,JB Shi,JT Sun,T Wang,LX Zeng,GB Jiang,Angew.Chem.Int.Ed.,2011,50,5913-5917),Li等人(S.L.Zhang,Z.Du,G.K.Li.Anal.Chem.2011,83,7531-7541)将石墨烯键合到实心石英毛细管外壁,制备了石墨烯涂层的SPME纤维,对多环芳烃进行萃取,均获得了较好的结果。但基于石墨烯修饰二氧化硅粒子的固相萃取操作非常复杂,无法实现自动化萃取,基于石墨烯涂层的针式SPME纤维萃取时间长、富集倍数有限,也很难实现萃取与分析检测于一体的自动在线联用。
发明内容
本发明提供一种管内固相微萃取柱的制备方法,它是将氧化石墨烯化学键合在毛细管内壁上,实现复杂样品体系中的目标化合物的高效萃取。
本发明的技术方案为如下步骤:
(1)毛细管内壁依次进行碱洗、酸洗、水洗、氮气吹干;
(2)在毛细管内灌入3–氨丙基三乙氧基硅烷(APTES)的甲苯溶液,3–氨丙基三乙氧基硅烷(APTES)的浓度为10~30mmol/L,室温下反应12小时,再置于70℃水浴锅中继续反应5小时,取出依次用甲苯、水冲洗,氮气吹干;
(3)配置0.1~1.0mg/mL氧化石墨烯水溶液,超声2小时,3000转/分钟离心5分钟,取上清液;向上清液加入10mmol/L的1-乙基-3-(3-二甲基氨丙基)-碳化二亚胺/5mmol/LN-羟基琥珀酰亚胺(EDC/NHS)溶液,室温反应0.5小时;
(4)将(3)得到的氧化石墨烯溶液灌入毛细管内,70℃水浴锅中反应2小时,氮气吹干;
(5)重复(2)、(3)和(4)步骤,在毛细管内壁上形成一定厚度的氧化石墨烯涂层,获得管内微萃取柱。
所述毛细管是玻璃毛细管或石英毛细管,内径为0.05~0.53mm。
所述的氧化石墨烯涂层的厚度为1~50微米。
所述石墨烯溶液可用碳纳米管溶液替代,浓度为0.1~1.0mg/mL。
所述的碳纳米管涂层的厚度为1~50微米。
本发明的有益效果是:
(1).管内固相微萃取的优点是能与其它检测仪器,如HPLC、GC在线连用,实现自动化的在线萃取、分析检测,不仅简化实验步骤、缩短分析时间,而且提高了分析的精密度和准确性。
(2).氧化石墨烯具有很好的化学、热和机械稳定性,因此,制备的管内萃取柱耐酸碱、有机溶剂和高温。
(3).通过化学键合的方法将氧化石墨烯固定在毛细管的内壁,稳定性好,与直接涂抹法相比,延长了萃取柱的使用寿命。
具体实施方式
实施例1
取内径0.25mm,长度为1m的石英毛细管,先用0.1M的氢氧化钠洗0.5小时,再用0.1M HCL盐酸清洗0.5小时,最后用去离子水洗到中性,氮气吹干。
将处理过的毛细管柱灌满20mM APTES的甲苯溶液,在室温下反应12小时,之后取出后放在70℃的水浴锅中继续反应5小时后取出,用甲苯冲洗,再用水冲洗。
将0.2mg/mL氧化石墨烯水溶液经过一段时间的超声之后,在3000转/分钟离心5min,取上清液4mL,加入10μL的10mM EDC/5mM NHS,活化0.5小时之后,将其灌入毛细管,在70℃的水浴锅中反应2小时,氮吹干燥,获得管内石墨烯微萃取柱。
实施例2
取内径0.53mm,长度为1m的石英毛细管,先用0.1M的氢氧化钠洗0.5小时,再用0.1M HCL盐酸清洗0.5小时,最后用去离子水洗到中性,氮气吹干。
将处理过的毛细管柱灌满20mM APTES的甲苯溶液,在室温下反应12小时,之后取出后放在70℃的水浴锅中继续反应5小时后取出,用甲苯冲洗,再用水冲洗。
将0.2mg/mL氧化石墨烯水溶液经过一段时间的超声之后,在3000转/分钟下离心5min,取上清液4mL,加入10μL的10mM EDC/5mM NHS,活化0.5小时之后,将其灌入毛细管,在70℃的水浴锅中反应2小时,氮吹干燥,获得管内石墨烯微萃取柱。
实施例3
取内径0.25mm,长度为1m的石英毛细管,先用0.1M的氢氧化钠洗0.5小时,再用0.1M HCL盐酸清洗0.5小时,最后用去离子水洗到中性,氮气吹干。
将处理过的毛细管柱灌满20mM APTES的甲苯溶液,在室温下反应12小时,之后取出后放在70℃的水浴锅中继续反应5小时后取出,用甲苯冲洗,再用水冲洗。
将0.2mg/mL碳纳米管水溶液经过一段时间的超声之后,在3000转/分钟离心5min,取上清液4mL,加入10μL的10mM EDC/5mM NHS,活化0.5小时之后,将其灌入毛细管,在70℃的水浴锅中反应2小时,氮吹干燥,获得管内碳纳米管微萃取柱。
Claims (4)
1.一种管内固相微萃取柱的制备方法,步骤如下:
(1)毛细管内壁依次进行碱洗、酸洗、水洗、氮气吹干;
(2)在毛细管内灌入3–氨丙基三乙氧基硅烷(APTES)的甲苯溶液,3–氨丙基三乙氧基硅烷(APTES)的浓度为10~30 mmol/L,室温下反应12 小时,再置于70 ℃水浴锅中继续反应5小时,取出依次用甲苯、水冲洗,氮气吹干;
(3)配置0.1~1.0 mg/mL氧化石墨烯水溶液,超声2小时,3000转/分钟离心5分钟,取上清液;向上清液加入10 mmol/L的1-乙基-3-(3-二甲基氨丙基)-碳化二亚胺和5 mmol/L的N-羟基琥珀酰亚胺溶液,室温反应0.5小时;
(4)将(3)得到的氧化石墨烯溶液灌入毛细管内,70 ℃水浴锅中反应2小时, 氮气吹干;
(5)重复(2)、(3)和(4)步骤,在毛细管内壁上形成一定厚度的氧化石墨烯涂层,获得管内微萃取柱。
2.根据权利要求1所述的一种管内固相微萃取柱的制备方法,其特征在于所述毛细管是玻璃毛细管或石英毛细管,内径为0.05~0.53 mm。
3.根据权利要求1所述的一种管内固相微萃取柱的制备方法,其特征在于所述的氧化石墨烯涂层的厚度为1~50 微米。
4. 根据权利要求1所述的一种管内固相微萃取柱的制备方法,其特征在于所述氧化石墨烯溶液可用碳纳米管溶液替代,浓度为0.1~1.0 mg/mL。
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US7407568B1 (en) * | 2002-11-08 | 2008-08-05 | University Of South Florida | Method of using sol-gel coatings for on-line preconcentration of amino acids in capillary electrophoresis |
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CN103127919A (zh) * | 2013-03-19 | 2013-06-05 | 北京师范大学 | 一种用于固相微萃取的钛基石墨烯涂层制备方法 |
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CN101091839A (zh) * | 2007-04-20 | 2007-12-26 | 厦门大学 | 一种固相微萃取萃取头及其制备方法 |
CN101279145A (zh) * | 2008-05-27 | 2008-10-08 | 厦门大学 | 一种甲基丙烯酸聚合物固相微萃取纤维及其制备方法 |
CN102631900A (zh) * | 2012-04-11 | 2012-08-15 | 中国科学院化学研究所 | 快速制备固相微萃取纤维萃取涂层的方法 |
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