CN115254075A - SiO2@ZIF-8固相萃取柱及其制备方法和应用 - Google Patents
SiO2@ZIF-8固相萃取柱及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种SiO2@ZIF‑8固相萃取柱及其制备方法和应用,该固相萃取柱是以SiO2@ZIF‑8为填料制备得到的。SiO2@ZIF‑8具有微介孔结构,与DA之间有静电作用,配位作用以及良好的空间位阻作用,其孔径尺寸与DA有良好的契合性,水稳定性以及酸碱稳定性良好。并且SiO2@ZIF‑8粒径较大,以其作为填料制备的固相萃取柱背压低。使用SiO2@ZIF‑8固相萃取柱对海水中DA进行有效富集并通过与高效液相色谱‑串联三重四级杆质谱法(HPLC‑MS/MS)联用,建立一种具有灵敏度高、重现性好、准确度高等优点的海水中DA的检测方法,在海洋赤潮预警和海洋环境监测方面有良好应用前景。
Description
技术领域
本发明属于固相萃取柱制备技术领域,具体涉及以金属有机骨架复合材料SiO2@ZIF-8为填料的固相萃取柱,以及其制备方法和该固相萃取柱用于海水中软骨藻酸的富集纯化。
背景技术
软骨藻酸(DA)是一种海洋藻毒素,主要由菱形硅藻和拟菱形硅藻产生。DA属于水溶性藻类毒素,是谷氨酸的异构体,具有强烈的神经毒性。水中的贝类和鱼类对DA有较强的耐受力,故在赤潮暴发期间DA可在贻贝等滤食生物体内积累,然后通过食物链危害人类健康。人类误食被DA污染海产品会产生消化系统及神经系统症状。消化系统症状包括恶心,呕吐,腹泻或腹部痉挛,神经系统症状包括记忆功能的长久性损害,严重时表现昏迷状态或者死亡。由于DA在全球海域广泛存在,DA在全球引起的中毒事件不断被报道。因此对海水中DA的检测与监测很有必要。然而,其在海水中含量极低且基质复杂,故对痕量的DA检测仍然面临挑战。
本发明通过简便的方法制备了能够快速高效富集海水中DA的固相萃取柱,其填料SiO2@ZIF-8具有大的比表面积、丰富的活性吸附位点、适宜的孔径尺寸等同金属有机骨架相似的优势,同时,其在水溶液、有机溶剂和酸碱溶液中也有较好的稳定性。此外,SiO2@ZIF-8表面的Zn2+可与DA的羧基产生配位左右,因此SiO2@ZIF-8为填料的固相萃取柱对于DA有良好的选择性吸附作用,使用其富集海水中的DA并与HPLC-MS/MS联用可实现对复杂基质(海水)中低浓度DA的检测。
发明内容
本发明的目的在于提供一种以金属有机骨架复合材料(SiO2@ZIF-8)为填料的固相萃取柱的制备方法及其应用,该材料是通过ZIF-8和SiO2结合形成的,其尺寸比ZIF-8更大,更适合作为固相萃取柱的填料。以SiO2@ZIF-8为填料制备固相萃取柱,并与HPLC-MS/MS联用,建立一种检测复杂基质中低浓度的DA的方法。
为实现上述目的,本发明采用如下技术方案:
本发明第一要保护的是所述以SiO2@ZIF-8为填料的固相萃取柱的制备及其用于固相萃取DA,并结合HPLC-MS/MS联用实现海水、海产品等复杂基质样品中DA的检测。
其中,固相萃取柱制备方法包括以下步骤:
步骤S1固相萃取柱填料SiO2@ZIF-8的制备:
步骤S11 SiO2-COOH的制备方法:
步骤S111 3.36 g戊二酸酐和6.96 mL 3-氨丙基三乙氧硅烷溶解在240 mL N,N-二甲基甲酰胺中,溶液在30℃水浴中加热,持续搅拌3 h后,
步骤S112 将含有6 g SiO2、100 mL DMF和9 mL水的混合溶液加入步骤S111所得的溶液中,在30℃水浴中加热,继续搅拌5 h。将所得产物用乙醇洗涤离心3次(250 rpm,1min),所得固体在60℃下真空干燥12 h后,获得SiO2-COOH。将SiO2表面羧基化是便于后续步骤S121中,ZIF-8的金属离子Zn2+与硅球表面的-COOH配位结合,使得ZIF-8能均匀地包覆于SiO2上。
步骤S12 SiO2@ZIF-8的制备方法:
步骤S121 3.0 g Zn(NO3)2·6H2O溶解在60.0 mL的甲醇中,然后加入3.0 g步骤S11合成的SiO2-COOH,在70℃油浴中加热,持续搅拌5 min。
步骤S122 8.3 g 2-甲基咪唑溶解在60.0 mL 甲醇中,加入步骤S121中所得溶液,在70℃油浴中加热,持续搅拌15 min,将所得产物用甲醇洗涤离心7次(250 rpm, 1 min)。
步骤S123 3.0 g Zn(NO3)2·6H2O溶解在60.0 mL的甲醇中,然后加入步骤S122合成的产物,在70℃油浴中加热,持续搅拌5 min。
步骤S124 8.3 g 2-甲基咪唑溶解在60.0 mL 甲醇中,加入步骤S123中所得溶液,在70℃油浴中加热,持续搅拌15 min,将所得产物用甲醇洗涤离心7次(250 rpm, 1 min)。所得固体在60℃下真空干燥12 h后,获得SiO2@ZIF-8材料。
步骤S2固相萃取柱的制备
步骤S21取一根空固相萃取柱,先将筛板置入底部,并将其装上固相萃取装置,打开抽真空泵,调节装置压力。
步骤S22 称取SiO2@ZIF-8材料,将材料倒入空固相萃取柱中,打开压力阀,使材料在压力下平整压实,最后装入筛板,继续压实材料。即可获得以SiO2@ZIF-8为填料的固相萃取柱。
步骤S21中调节压力为0.09 MPa。
步骤S21中固相萃取柱体积为3.0 mL、6.0 mL、10.0 mL中的任意一种。
步骤S22 中称取SiO2@ZIF-8材料的用量为:0.25 g (3 mL)、0.50 g (6 mL)、0.80g (10 mL)中的任意一种。
本发明的优点是:
1)本发明使用对环境友好、经济实用的简便方法制备SiO2@ZIF-8材料,该材料具有丰富的活性吸附位点,和较大的比表面积,可与目标物可产生静电作用和配位作用,且孔径大小与DA分子大小契合较好,因此能快速高效富集DA。
2)复合材料SiO2@ZIF-8尺寸大、比表面积较高,用SiO2@ZIF-8材料制备的固相萃取柱背压低,吸附容量高,可高效富集大量(100 mL~1 L)海水样品中的DA,且操作简单,快速,可控制吸附时间在30 min以内。
3)在固相萃取的过程中,可以很好地克服海水的基质效应,也可以通过简单的淋洗去除样品中的盐分。
4)在最优的条件下,SiO2@ZIF-8固相萃取柱对DA有极高的吸附效率,与HPLC-MS /MS方法联用建立的方法拥有缴款的线性范围(8.0~1000.0 ng L-1)、较低的检测限(4 ng L-1)。
5)本发明克服了目前对复杂基质中痕量DA难以检测的问题,在海洋赤潮预警和海洋环境监测方面有良好的应用前景。
附图说明
图1 为SiO2@ZIF-8材料的扫描电镜图;
图2 为SiO2@ZIF-8材料的X射线衍射图;
图3 为SiO2@ZIF-8材料的N2吸脱附曲线(a)和孔径分布图(b);
图4 为SiO2@ZIF-8固相萃取柱的图片;
图5 为SiO2@ZIF-8固相萃取柱对海水中DA萃取后进样色谱图与海水加标10 ppt水样萃取后进样色谱图(a)以及10 ppt DA标准品的色谱图(b);
图6 为三种实施例不同规格的固相萃取柱对DA的富集效率对比柱状图;
图7 为实施例1应用中SiO2@ZIF-8固相萃取柱对DA检测的工作曲线;
图8 为SiO2@ZIF-8材料吸附前后的zeta电位变化图。
具体实施方式
下面结合附图实施例对本发明进一步详细说明,需要指出的是,以下所述实施例旨在便于对本发明的理解,而对其不起任何限定作用。
实施例1:
一种SiO2@ZIF-8固相萃取柱的制备方法,其包括以下步骤:
1)固相萃取柱填料SiO2@ZIF-8的制备:
(a) SiO2-COOH的制备方法:
(i)3.36 g戊二酸酐和6.96 mL 3-氨丙基三乙氧硅烷溶解在240 mL N,N-二甲基甲酰胺中,溶液在30℃水浴中加热,持续搅拌3 h后,
(ii) 将含有6 g SiO2、100 mL DMF和9 mL水的混合溶液加入SiO2-COOH的制备方法步骤(i)中所得的溶液中,在30℃水浴中加热,继续搅拌5 h。将所得产物用乙醇洗涤离心3次(250 rpm,1 min),所得固体在60℃下真空干燥12 h后,获得SiO2-COOH,用于SiO2@ZIF-8的制备。
(b) SiO2@ZIF-8的制备方法:
(i) 3.0 g Zn(NO3)2·6H2O溶解在60.0 mL的甲醇中,然后加入3.0 g SiO2-COOH,在70℃油浴中加热,持续搅拌5 min。
(ii) 8.3 g 2-甲基咪唑溶解在60.0 mL 甲醇中,加入SiO2@ZIF-8的制备方法步骤(i)所得的溶液中,在70℃油浴中加热,持续搅拌15 min,将所得产物用甲醇洗涤离心7次(250 rpm, 1 min)。
(iii) 3.0 g Zn(NO3)2·6H2O溶解在60.0 mL的甲醇中,然后加入步骤(ii)合成的产物,在70℃油浴中加热,持续搅拌5 min。
(Ⅳ) 8.3 g 2-甲基咪唑溶解在60.0 mL 甲醇中,加入SiO2@ZIF-8的制备方法步骤(iii)所得的溶液中,在70℃油浴中加热,持续搅拌15 min,将所得产物用甲醇洗涤离心7次(250 rpm, 1 min),所得固体在60℃下真空干燥12 h后,获得SiO2@ZIF-8材料。
2)固相萃取柱的制备
(a) 取一根3.0 mL的空固相萃取柱,先将筛板置入底部,并将其装上固相萃取装置,打开抽真空泵,调节装置压力为0.09 MPa。
(b) 称取SiO2@ZIF-8材料0.25 g,将材料倒入空固相萃取柱中,打开压力阀,使材料在压力下平整压实,最后装入筛板,继续压实材料。即可获得以SiO2@ZIF-8为填料的3.0mL的固相萃取柱。
3)SiO2@ZIF-8固相萃取柱用于DA的检测。该固相萃取柱的回收率为87.6%。该方法的检测限为4.0 ng L-1,线性范围为:8.0-300.0 ng L-1,R2为0.9993。
实施例2:
1)固相萃取柱填料SiO2@ZIF-8的制备(同实施例1)
2)固相萃取柱的制备
(a) 取一根6.0 mL的空固相萃取柱,先将筛板置入底部,并将其装上固相萃取装置,打开抽真空泵,调节装置压力为0.09 MPa。
(b) 称取SiO2@ZIF-8材料0.50 g,将材料倒入空固相萃取柱中,打开压力阀,使材料在压力下平整压实,最后装入筛板,继续压实材料。即可获得以SiO2@ZIF-8为填料的6.0mL的固相萃取柱。
3)SiO2@ZIF-8固相萃取柱用于DA的检测。该固相萃取柱的回收率为75.3%。该方法的检测限为4.0 ng L-1。
实施例3:
1)固相萃取柱填料SiO2@ZIF-8的制备(同实施例1)
2)固相萃取柱的制备
(a) 取一根10.0 mL的空固相萃取柱,先将筛板置入底部,并将其装上固相萃取装置,打开抽真空泵,调节装置压力为0.09 MPa。
(b) 称取SiO2@ZIF-8材料0.80 g,将材料倒入空固相萃取柱中,打开压力阀,使材料在压力下平整压实,最后装入筛板,继续压实材料。即可获得以SiO2@ZIF-8为填料的10.0mL的固相萃取柱。
3)SiO2@ZIF-8固相萃取柱用于DA的检测。该固相萃取柱的回收率为69.5%。该方法的检测限为4.0 ng L-1。
应用实例
将实例1所得的固相萃取柱对海水中DA进行固相萃取,结合HPLC-MS / MS,应用DA的检测,具体步骤如下:
1)海水样品的前处理:将海水样品过滤五次。
2)固相萃取柱对软骨藻酸的富集:将固相萃取柱安装在固相萃取装置上,打开水泵,调节压力为0.09 MPa。用6.0 mL甲醇和2.0 mL二次水对固相萃取柱进行活化和平衡。取处理后的500.0 mL海水样品进行固相萃取。用1.0 mL二次水进行淋洗,洗去海水样品残留在柱中的盐分。用10 mM组氨酸水溶液进行洗脱,最后,将洗脱液旋蒸后再用二次水定容至500.0 μL,制样。
3)取处理后的海水水样配成10 ppt的500.0 mL海水加标水样,按步骤2)中的操作进行固相萃取,后洗脱,旋蒸,定容,制样。
4)取500.0 mL二次水,配成10ppt浓度的标准DA溶液,按步骤2)中的操作进行固相萃取,后洗脱,旋蒸,定容,制样。
5)将步骤2)、3)、4)中的样品放入HPLC-MS / MS进样检测。
6)在设定的色谱方法下,应用C18(aq)色谱柱,流动相A为0.1%甲酸水溶液;流动相B为0.1%甲酸乙腈溶液,A相:B相为80 %:20 %,进样量为10.0 μL,流动相流速为200.0 μL/min,优化后的质谱条件为:离子源温度:300℃,鞘气:35,辅助气:10,毛细管温度:350℃。
7)本发明利用SiO2@ZIF-8固相萃取柱对海水中的DA进行萃取,并通过与HPLC-MS/MS联用,实现对复杂基质(海水、海产品)中低浓度DA的检测。检测限可达到4.0 ng L-1,线性范围为:8.0-300.0 ng L-1,R2为0.9993。
图1 为SiO2@ZIF-8材料的扫描电镜 (SEM) 图,由SEM图可知,硅球表面成功包覆了金属有机骨架材料ZIF-8,且SiO2@ZIF-8尺寸大小为20μm。
图2 为SiO2@ZIF-8材料的X射线衍射图,由图2可知,SiO2@ZIF-8的XRD谱图中,在2θ=10-15°处存在SiO2的特征峰,同时出现与ZIF-8晶体的拟合谱图响应强度一致的特征峰,这进一步证实了SiO2@ZIF-8材料的成功合成。
图3 为SiO2@ZIF-8材料的N2吸脱附曲线(a)和孔径分布图(b),由图3中(a)可知,SiO2@ZIF-8为微介孔材料,其表面积为152.786 m2 g-1,孔径主要分布在1.87 nm和39.06nm处。
图4 为SiO2@ZIF-8固相萃取柱的图片,由图4可知,SiO2@ZIF-8固相萃取柱填料紧密,压实状况良好,且使用后未出现明显变化。
图5 为SiO2@ZIF-8固相萃取柱对DA萃取后进样色谱图,图5-a为SiO2@ZIF-8固相萃取柱对海水中DA萃取后进样色谱图,图5-b为SiO2@ZIF-8固相萃取柱对二次水配制的10 ngL-1 DA标准溶液萃取后进样色谱图,图5-b为SiO2@ZIF-8固相萃取柱对海水中加标10 ng L-1DA溶液萃取后进样色谱图。由图5可知,海水样的色谱峰与海水加标样的色谱峰位置相同,可以断定海水中含有痕量的DA。
图6 为三种实施实例不同规格的固相萃取柱对DA的回收率对比柱状图,由图6可知,3 mL的SiO2@ZIF-8固相萃取柱对DA的回收率最高,因此选用3 mL的SiO2@ZIF-8固相萃取柱作为应用实施实例,用于建立方法,完成工作曲线。
图7 为实例1应用中SiO2@ZIF-8固相萃取柱对DA检测的工作曲线。由图7可得,应用实例中,SiO2@ZIF-8固相萃取柱对海水中DA富集检测方法的检测限为4.0 ng L-1,线性范围为:8.0-300.0 ng L-1,R2为0.9993。
图8 为zeta电位图。由图8可得,DA的zeta电位为-10.3 mV,呈负电性;SiO2@ZIF-8的zeta电位为17.2 mV,呈正电性;当SiO2@ZIF-8吸附DA后,zeta电位明显下降,由17.2下降至5.8。可以看出,SiO2@ZIF-8可通过静电作用吸附DA。
以上所述仅为本发明的较佳实施例,凡依本发明申请专利范围所做的均等变化与修饰,皆应属本发明的涵盖范围。
Claims (9)
1.一种SiO2@ZIF-8固相萃取柱的制备方法,其特征在于:包括以下步骤:
步骤S1固相萃取柱填料SiO2@ZIF-8的制备:
步骤S11 SiO2-COOH的制备方法:
1)戊二酸酐和3-氨丙基三乙氧硅烷溶解在N,N-二甲基甲酰胺中并进行水浴反应;
2)将含有SiO2、 DMF和水的混合溶液加入步骤1)所得的溶液中再次进行水浴反应,将所得产物用乙醇洗涤、离心、干燥,得到SiO2-COOH;
步骤S12 SiO2@ZIF-8的制备方法:
(1)Zn(NO3)2·6H2O溶解在甲醇中,并将步骤S11合成的SiO2-COOH分散在其中,并进行油浴反应;
(2)2-甲基咪唑溶解在甲醇中,并加入步骤(1)油浴反应之后的溶液中,再次进行油浴反应,将所得产物用甲醇洗涤,
(3)Zn(NO3)2·6H2O溶解在甲醇中,然后加入步骤(2)所得产物,并进行油浴反应;
(4)2-甲基咪唑溶解在甲醇中,并加入步骤(3)油浴反应之后的溶液中,再次进行油浴反应,将所得产物用甲醇洗涤,并干燥,获得SiO2@ZIF-8材料;
步骤S2固相萃取柱的制备:
步骤S21:取一根空固相萃取柱,先将筛板置入底部,并将其装上固相萃取装置,打开抽真空泵,调节装置压力;
步骤S22:称取SiO2@ZIF-8材料,将其倒入空固相萃取柱中,打开压力阀,使SiO2@ZIF-8材料在压力下平整压实,最后装入筛板,继续压实,即获得SiO2@ZIF-8固相萃取柱。
2.根据权利要求1所述的SiO2@ZIF-8固相萃取柱的制备方法,其特征在于:步骤1)中水浴反应的温度为30℃,并持续搅拌3 h;步骤2)中水浴反应的温度为30℃,并持续搅拌5 h。
3.根据权利要求1所述的SiO2@ZIF-8固相萃取柱的制备方法,其特征在于:步骤2)中干燥具体为:在60℃下真空干燥12 h。
4.根据权利要求1所述的SiO2@ZIF-8固相萃取柱的制备方法,其特征在于:步骤(1)中油浴反应的温度为70℃,并持续搅拌5 min;步骤(2)中油浴反应的温度为70℃,并持续搅拌15min。
5.根据权利要求1所述的SiO2@ZIF-8固相萃取柱的制备方法,其特征在于:步骤(3)中干燥具体为:在60℃下真空干燥12 h。
6.根据权利要求1所述的SiO2@ZIF-8固相萃取柱的制备方法,其特征在于:
步骤S21中调节压力为0.09 MPa;步骤S21中固相萃取柱体积为3.0 mL、6.0 mL、10.0mL中的任意一种。
7.根据权利要求1所述的SiO2@ZIF-8固相萃取柱的制备方法,其特征在于:
步骤S22 中称取SiO2@ZIF-8材料的用量为:0.25 g、0.50 g、0.80 g中的任意一种。
8.一种如权利要求1-7任一项所述制备方法制得的SiO2@ZIF-8固相萃取柱。
9.一种如权利要求8所述的SiO2@ZIF-8固相萃取柱在用于富集海水中的软骨藻酸DA上的应用。
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