CN112525887B - 一种HAP/Ag复合SERS增强基底的体液拉曼光谱检测方法 - Google Patents
一种HAP/Ag复合SERS增强基底的体液拉曼光谱检测方法 Download PDFInfo
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Abstract
本发明涉及体液样本的分析检测领域,具体涉及一种HAP/Ag复合SERS增强基底的体液拉曼光谱检测方法。将银纳米粒子沉积在HAP上制备成复合SERS增强基底,通过SERS技术进行检测不同人群中采集的体液样本,实验证明HAP/Ag复合SERS增强基底可以有效检测体液样本。相比于传统检测方法,该检测方法避免了繁琐的样品前处理过程,具有快速、操作简单、成本低廉等特点,极大缩短了时间,提高了检测效率。
Description
技术领域
本发明涉及体液样本的分析检测领域,具体涉及制备一种羟基磷灰石(HAP)纳米粒子负载金属纳米粒子复合材料,以该纳米复合材料为SERS底物,结合表面增强拉曼光谱(Surface-enhanced Raman spectroscopy,简称SERS),对不同人群中采集的体液样本进行光谱检测。
背景技术
近年来,拉曼光谱在生物医学、食品安全、材料科学和环境监测中的应用引起了人们的广泛关注。拉曼光谱是由印度科学家拉曼在1928年发现的一种分子振动光谱技术。它可以根据生物组织的分子组成和结构提供光谱指纹类型信息。与红外吸收光谱和荧光光谱相比,拉曼光谱具有空间分辨率高、峰窄、不发生光漂白等显著优势。然而拉曼光谱信号微弱,易受自体荧光干扰,低效率的散射需要高的激光功率,光谱采集时间长,因此可能导致样品损坏或在实际应用中不切实际,所以利用拉曼光谱技术进行检测存在一定局限性。SERS技术被认为是一种用于生物医学检测的高度灵敏的分析技术,SERS技术具有超高的灵敏度、快速响应时间和分子振动指纹生成能力,并且能淬灭生物分子荧光,解决了普通拉曼光谱信号微弱的问题,将原有的拉曼信号大大提高1013-1015倍。在此基础上,非常有必要开发一种良好的SERS底物,可以提供增强拉曼信号的功能,实现对检测对象的超灵敏检测。
由于SERS具有优异的分子特异性和高灵敏度,能够快速、无损、超灵敏检测分析复杂的生物分子,例如血浆、血清、尿液、唾液、细胞、组织、DNA、RNA等。近年来许多研究人员将SERS用于肝癌、乳腺癌、鼻咽癌、胃癌等样本的检测。
银(Ag)是一种常见的贵金属,相比其他贵金属如金、钯和铂等具有廉价的优势。银纳米材料通常具有非常稳定的物化性质,目前银纳米颗粒已经在SERS、催化和硫化物检测等领域获得了广泛的应用,但是纳米颗粒尺寸的减小伴随着表面能的增加,高表面能会使纳米颗粒之间发生团聚,为了提高纳米颗粒的稳定性,通常需要将其负载到一些载体材料表面制得纳米颗粒复合材料。羟基磷灰石HAP由于具有高生物相容性和骨传导特性,因此是一种广泛使用的生物医学材料,它们还被用于分离和吸附领域。由于它们基于磷酸钙中含有丰富的Ca2+,并且多孔网络结构在其表面上提供了丰富的结合位点,HAP能够掺杂Ag+离子或与AgNPs结合。因此,本发明提出了一种负载Ag NPs的HAP纳米颗粒的新方法,从而实现了更有效,更快速地进行检测样本。
发明内容
本发明目的在于提出一种利用SERS技术检测体液样本表面增强拉曼光谱的方法。构建HAP/Ag基底,直接将被检测物滴加到基底上,通过SERS技术实现对样本的快速检测。相比于传统检测方法,该检测方法避免了繁琐的样品前处理过程,具有快速、操作简单、成本低廉等特点,极大缩短了时间,提高了检测效率。该方法中主要用到的纳米材料是HAP,HAP具有高骨传导,骨诱导性,生物相容性好,本发明采用水热法制备花瓣状HAP。
为实现上述发明目的,本发明采用的技术方案如下:
一种基于HAP/Ag对体液样本表面增强拉曼光谱的检测方法,将银纳米粒子沉积在HAP上制备成复合SERS增强基底,通过SERS技术进行检测不同人群中采集的体液样本,实验证明HAP/Ag复合SERS增强基底可以有效检测体液样本。
进一步地讲,该方法包括以下步骤:
1、HAP的制备
采用水热法制备HAP纳米颗粒,称取1-1.5 g的Ca(NO3)2•4H2O溶解于25-50 mL的超纯水中,搅拌10-30 min。称取1-1.3 g的Na2HPO4•12H2O溶解于25-50 mL的超纯水中。将Na2HPO4•12H2O溶液按一分钟滴加一滴的速度逐滴滴加到Ca(NO3)2•4H2O溶液中,在滴加的过程中,溶液由澄清逐渐变浑浊,随后用稀硝酸滴定pH值为2.5,溶液由浑浊变澄清。接着在溶液中加入5-10 mg的环己烷六羧酸H6L和1-3 g的CO(NH2)2持续搅拌20-50 min。将上述澄清溶液装入水热反应釜,100-150℃,反应3-5 h,待反应结束后自然冷却至室温。离心收集产物,用乙醇和超纯水清洗,最后在真空干燥箱中干燥64-72 h,然后研磨成HAP粉末。
2、HAP/Ag的制备
称取3-7 mg干燥好的HAP粉末加入到装有15 mL,20 mM的硝酸银的乙醇溶液,超声25-50 min使其均匀分散。然后将上述悬浊液置于30-50℃ 水浴加热的环境中,向其中加入15-30 µL的正丁胺,磁力搅拌30-50 min。待反应结束后,将反应产物离心分离,水洗两次,无水乙醇洗两次,最后放于30-50℃真空干燥箱中干燥24-48 h得到最终产物。将制备好的HAP/Ag涂抹到铝片上作为SERS增强基底。
3、HAP/Ag的SERS检测
分别用不同人群的体液样本作为底物进行SERS测量,在SERS实验中,将不同体液样本滴加到HAP/Ag复合SERS增强基底上。在空气中自然风干,用于SERS测量。采用400-850nm的激光光源照射上述样本,拉曼光谱取谱范围为400-1800 cm-1,积分时间为10s,随机的从样本五个不同位置检测由所述不同的体液样本与HAP/Ag复合SERS增强基底产生的表面增强拉曼光谱信号。
4、得到不同体液样本的SERS特征峰
不同体液样本重复步骤(1)到(3)的操作建立不同体液样本表面增强拉曼光谱数据库,采用扣荧光的方法对所述表面增强拉曼光谱数据库进行后处理分析,建立表面增强拉曼光谱分析模型,获得不同体液样本对应的表面增强拉曼光谱的特征峰。
其中,所述不同体液样本使用量的体积为50-200 µL。
其中,所述的不同人群中采集的体液样本是指血清、尿液、唾液。
与现有技术相比,本发明具有如下优点:
1、将银纳米粒子沉积在HAP上制备成复合SERS增强基底,样品滴加到上面可直接进行SERS检测。
2、无需复杂的预处理步骤,操作简单,耗时短。
3、不受样品条件限制,几乎可对任何人群的体液样本进行鉴定。
附图说明
图1是本发明方法的检测流程图。如图所示,本发明将银纳米粒子沉积在HAP上制备成复合SERS增强基底,再将不同人群中采集的体液样本直接滴加在上面,通过SERS技术进行检测。
图2是本发明证明HAP/Ag具有增强基底的作用的SERS光谱图。
图3是本发明将血清滴加到HAP/Ag复合SERS增强基底上测量的SERS光谱图。
图4是本发明将尿液滴加到HAP/Ag复合SERS增强基底上测量的SERS光谱图。
图5是本发明将唾液滴加到HAP/Ag复合SERS增强基底上测量的SERS光谱图。
图6是制备的HAP/Ag复合物的扫描电镜图(SEM),放大倍数为10000倍,粒子为上面附着小颗粒、边缘粗糙的花瓣状。
具体实施方式
下面对本发明的方案措施作进一步的说明。
实施例1
羟基磷灰石HAP的制备
称取1-1.5 g Ca(NO3)2•4H2O溶解于25-50 mL的超纯水中,搅拌10-30 min;称取1-1.3 g的Na2HPO4•12H2O溶解于25-50 mL的超纯水中;将Na2HPO4•12H2O按一分钟滴加一滴的速度滴加到Ca(NO3)2•4H2O溶液中,在滴加的过程中,溶液由澄清逐渐变浑浊,随后用稀硝酸滴定溶液的pH值为2.5,溶液变澄清;接着在溶液中加入5-10 mg的环己烷六羧酸H6L 和1-3g的CO(NH2)2持续搅拌20-50 min;将上述澄清溶液100-150℃进行水热反应,反应3-5 h 待反应结束后自然冷却至室温;离心收集产物,用乙醇和超纯水清洗,最后在真空干燥箱中干燥64-72 h,然后研磨成羟基磷灰石纳米颗粒粉末。
实施例2
HAP/Ag的制备
称取3-7 mg干燥好的HAP粉末加入到装有15 mL, 20 mM硝酸银的乙醇溶液,超声25-50 min使其均匀分散;然后将上述悬浊液置于30-50℃水浴加热的环境中,向其中加入15-30 µL的正丁胺,磁力搅拌30-50 min;待反应结束后,将反应产物离心分离,水洗两次,无水乙醇洗两次,最后真空干燥放于得到HAP/Ag纳米颗粒;将制备好的HAP/Ag涂抹到铝片上作为SERS增强基底。
实施例3
基于HAP/Ag 基底滴加上R6G,证明其具有增强基底的作用
首先配制好浓度为10-4 M的R6G溶液。直接取4 µL的R6G溶液置于纯度为99.99%铝片上,室温下晾干,进行光谱检测,如图2所示,测纯R6G没有出现SERS特征峰。接着称取HAP/Ag粉末2-6 mg加入到1.5 mL容积的聚丙烯离心管中,在离心管中加入60-120 µL蒸馏水,超声分散 10-30 min,将分散后的HAP/Ag涂抹于纯度为99.99%铝片上,取30 µL的R6G溶液滴加到HAP/Ag基底上,室温下晾干,进行SERS光谱检测。检测所用激光激发波长为785 nm,取谱范围为400-1800 cm-1,功率为10 mW,积分时间10 s,积分次数2次,检测到R6G的SERS光谱如图2所示。此实验证明HAP/Ag具有增强基底的作用。
实施例4
基于HAP/Ag 基底滴加上血清的SERS检测
称取HAP/Ag粉末3-9 mg加入到1.5mL容积的聚丙烯离心管中,在离心管中加入50-100 µL蒸馏水,超声分散10-30 min,将分散后的HAP/Ag涂抹于纯度为99.99%铝片上,取50µL的血清滴加到HAP/Ag 基底上,室温下晾干,进行SERS光谱检测。检测所用激光激发波长为785 nm,取谱范围为400-1800 cm-1,功率为10 mW,积分时间10 s,积分次数1次,检测到血清的SERS光谱如图3所示。
实施例5
基于HAP/Ag 基底滴加上尿液的SERS检测
HAP/Ag 复合SERS增强基底滴加上尿液的表面增强拉曼光谱检测的方法和实施例1的过程相同。取200 µL尿液滴加到HAP/Ag 基底上,室温下晾干,进行SERS光谱检测。检测所用激光激发波长为785 nm,取谱范围为400-1800 cm-1,功率为5mW,积分时间10s,积分次数2次,检测到尿液的SERS光谱如图4所示。
实施例6
基于HAP/Ag 基底滴加上唾液的SERS检测
HAP/Ag 复合SERS增强基底滴加上唾液的表面增强拉曼光谱检测的方法和实施例1、2的过程相同。取100 µL唾液滴加到HAP/Ag 基底上,室温下晾干,进行SERS光谱检测。检测所用激光激发波长为785 nm,取谱范围为400-1800 cm-1,功率为10 mW,积分时间10s,积分次数2次,检测到唾液的SERS光谱如图5所示。
Claims (4)
1.一种羟基磷灰石/Ag复合SERS增强基底的体液拉曼光谱检测方法,其特征在于,将银纳米粒子沉积在羟基磷灰石上,再将不同人群中采集的体液样本直接滴加在上面,通过表面增强拉曼光谱SERS技术检测获取体液样本的SERS光谱图来有效检测体液样本;
该方法包括如下步骤:
(1)羟基磷灰石的制备
采用水热法制备羟基磷灰石纳米颗粒,具体为:称取1-1.5 g Ca(NO3)2•4H2O溶解于25-50 mL的超纯水中,搅拌10-30 min;称取1-1.3 g的Na2HPO4•12H2O溶解于25-50 mL的超纯水中;将Na2HPO4•12H2O溶液按一分钟滴加一滴的速度滴加到Ca(NO3)2•4H2O溶液中,在滴加的过程中,溶液由澄清逐渐变浑浊,随后用稀硝酸滴定溶液的pH值为2.5,溶液变澄清;接着在溶液中加入5-10 mg的环己烷六羧酸H6L和1-3 g的CO(NH2)2持续搅拌20-50 min;进行水热反应,待反应结束后自然冷却至室温;离心收集产物,用乙醇和超纯水清洗,最后在真空干燥箱中干燥64-72 h,然后研磨成羟基磷灰石纳米颗粒粉末;所述水热反应具体为100-150℃,反应3-5 h;
(2)羟基磷灰石/Ag的制备
称取3-7 mg干燥好的羟基磷灰石粉末加入到装有15 mL, 20 mM硝酸银的乙醇溶液,超声25-50 min使其均匀分散得到悬浊液;然后将上述悬浊液置于水浴加热的环境中,向其中加入15-30 µL的正丁胺,磁力搅拌30-50 min;待反应结束后,将反应产物离心分离,水洗两次,无水乙醇洗两次,最后真空干燥放于得到羟基磷灰石/Ag纳米颗粒;将制备好的羟基磷灰石/Ag涂抹到铝片上作为SERS增强基底;所述水浴加热温度为30-50℃;所述真空干燥具体为30-50℃真空干燥24-48 h;
(3) 羟基磷灰石/Ag的SERS检测
分别用不同人群的体液样本进行SERS测量,在SERS实验中,将不同体液样本滴加到羟基磷灰石/Ag复合SERS增强基底上;在空气中自然风干,用于SERS测量;在样本的五个不同位置检测由所述不同的体液样本与羟基磷灰石/Ag复合SERS增强基底产生的SERS信号;
(4) 得到不同体液样本的SERS特征峰
不同体液样本重复步骤(1)到(3)的操作建立不同体液样本表面增强拉曼光谱数据库,采用扣荧光的方法对所述表面增强拉曼光谱数据库进行后处理分析,建立表面增强拉曼光谱分析模型,获得不同体液样本对应的表面增强拉曼光谱的特征峰。
2. 根据权利要求1所述的羟基磷灰石/Ag复合SERS增强基底的体液拉曼光谱检测方法,其特征在于,步骤(3)SERS检测具体是用于检测的激光功率为0.1-20 mW,采用400-850nm的激光光源照射上述样本,拉曼光谱取谱范围为400-1800 cm-1,积分时间为10 s。
3.根据权利要求1所述的羟基磷灰石/Ag复合SERS增强基底的体液拉曼光谱检测方法,其特征在于:不同人群中采集的体液样本是指血清、尿液、唾液。
4. 根据权利要求1所述的羟基磷灰石/Ag复合SERS增强基底的体液拉曼光谱检测方法,其特征在于:所述不同体液样本使用量的体积为50-200 µL。
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