CN109696436A - 一种利用银纳米材料检测维生素b1的方法 - Google Patents
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Abstract
本发明公开了一种利用银纳米材料检测维生素B1的方法,包括以下步骤:步骤1,银粒子的制备:在AgNO3溶液中加入NaBH4溶液,在水浴锅中搅拌,逐滴加入谷胱甘肽溶液,于黑暗中继续搅拌,得到谷胱甘肽‑银纳米材料;步骤2:维生素B1的检测:取步骤1制备的谷胱甘肽‑银纳米材料,加入不同浓度的维生素B1溶液,再加入缓冲溶液,双氧水,3,3',5,5'‑四甲基联苯胺(TMB)溶液,观察溶液颜色变化,测其紫外可见吸收光谱,根据颜色变化及紫外可见吸收光谱的变化对维生素B1的浓度进行测定。本发明利用比色法快速检测维生素B1,不需要使用昂贵的仪器,通过颜色变化及紫外可见吸收光谱的变化即可测定维生素B1的含量。
Description
技术领域
本发明属于维生素检测技术领域,特别涉及一种利用银纳米材料的过氧化物酶样活性检测维生素B1的方法
背景技术
维生素B,也称叶酸,是人体必需的营养成分。维生素B主要有维生素B1,B2,B3,B5,B6,B7,B9,B12等多种。每一种都有其独特的作用。其中维生素B1(又称硫胺素或抗神经炎维生素或抗脚气病维生素),对于消除人体疲劳、帮助消化、促进神经系统的正常发育及治疗脚气等方面具有重要作用。然而,现有检测方法主要集中在对复合维生素B的检测(例如:申请号为201510510713.7的中国专利),尚未有单独检测维生素B1的报道。
申请号为201510510713.7的中国专利,检测复合维生素B中多种组分含量,其中有检测维生素B1,使用的是高效液相色谱法。该种方法需要使用昂贵的仪器,需要专业人员操作,且不适合现场检测。另外,所用流动相乙腈有毒,对于食品等领域的检测大大不利。
为了更广泛的推广维生素B1的检测方法,使用廉价易得的仪器进行快速、简单的检测迫在眉睫。
发明内容
本发明的目的是提供一种利用银纳米材料检测维生素B1的方法,以解决现有的维生素B1检测方法存在的需使用昂贵仪器,操作不便捷的问题。
为实现上述目的,本发明采用的技术方案为:
一种利用银纳米材料检测维生素B1的方法,其特征在于:包括以下步骤:
步骤1,银离子的制备:在AgNO3溶液中加入NaBH4溶液,在水浴锅中搅拌,逐滴加入的谷胱甘肽溶液,于黑暗中继续搅拌,得到谷胱甘肽-银纳米材料;
步骤2:维生素B1的检测:取步骤1制备的谷胱甘肽-银纳米材料,加入不同浓度的维生素B1溶液,再加入醋酸-醋酸钠缓冲溶液,双氧水,3,3',5,5'-四甲基联苯胺(TMB)溶液,观察溶液颜色变化,测其紫外可见吸收光谱,根据颜色变化及紫外可见吸收光谱的变化对维生素B1的浓度进行测定。
所述步骤1中,AgNO3溶液的浓度为0.5-1.5mM,优选为1mM,NaBH4溶液的浓度为0.01g/mL,谷胱甘肽溶液的浓度为1mM;AgNO3溶液、NaBH4溶液、谷胱甘肽溶液的体积比为25:0.2-0.4:0.4-0.6,优选为25:0.3:0.5。
所述步骤1中,在水浴锅中搅拌时的温度为10-40℃,优选为20℃,时间为10min;黑暗中继续搅拌的温度为25℃,时间为2h。
所述步骤1中,逐滴加入的谷胱甘肽溶液的速率为每分钟40-80滴,优选为每分钟40-80滴。
所述步骤2中,不同浓度的维生素B1溶液的浓度为0,0.01,0.05,0.1,0.2,0.4,0.6,1,1.2,2.0nM。
所述步骤2中,谷胱甘肽-银纳米材料、维生素B1溶液、缓冲溶液、双氧水、3,3',5,5'-四甲基联苯胺(TMB)溶液的体积比为8-12:10:10:10:10,优选为10:10:10:10:10。
所述步骤2中,缓冲溶液的pH为3.8-5.6,优选为5.2-5.5。
所述步骤2中,双氧水的浓度为1-10M,优选为10M。
所述步骤2中,3,3',5,5'-四甲基联苯胺(TMB)溶液的浓度为1-20mM,优选为10mM,其中,溶剂为无水乙醇。
有益效果:本发明的一种利用银纳米材料检测维生素B1的方法,利用比色法快速检测维生素B1,不需要使用昂贵的仪器,通过颜色变化及紫外可见吸收光谱的变化即可测定维生素B1的含量。该方法检测维生素B1,样品制备简单,检测过程操作容易,方便非专业人士操作,且具有较高的灵敏度和选择性。
附图说明
图1为加入谷胱甘肽-银纳米材料前后TMB+H2O2体系颜色及吸收光谱变化图;
图2为不同pH的缓冲溶液对体系催化活性的影响;
图3为不同温度对体系催化活性的影响;
图4为不同双氧水浓度对体系催化活性的影响;
图5为加入不同浓度维生素B1后,Ag+TMB+H2O2体系颜色及在652nm处吸收随VB1浓度的变化图;
图6为加入各种不同维生素后在652nm处的吸收值的变化。
具体实施方式
下面结合实施例对本发明做更进一步的解释。
根据下述实施例,可以更好的理解本发明。然而,本领域的技术人员容易理解,实施例所描述的具体的物料配比、工艺条件及其结果仅用于说明本发明,而不应当也不会限制权利要求书中所详细描述的本发明。
实施例
步骤1:银粒子的制备:在25mL的AgNO3(浓度为0.5-1.5mM,最优1mM)中加入200-400μL(最优300μL)的NaBH4(浓度为0.01g/mL),在10-40℃(最优为20℃)水浴锅中搅拌10分钟,逐滴(每分钟40-80滴,最优为60滴)加入400-600μL(最优500μL)的谷胱甘肽(GSH)(浓度为1mM),于25℃黑暗中继续搅拌2小时,得到GSH-AgNPs;
步骤2:维生素B1的检测:取80-120μL(最优100μL)所制备的GSH-AgNPs,加入100μL不同浓度的维生素B1溶液(浓度分别为:0,0.01,0.05,0.1,0.2,0.4,0.6,1,1.2,2.0nM),再加入100μL的入醋酸-醋酸钠缓冲溶液(pH 3.8-5.6,优选为5.2-5.5),100μL的双氧水(浓度为1-10M,最优10M),100μL的3,3',5,5'-四甲基联苯胺(TMB)(浓度为1-20mM,最优10mM),观察溶液颜色变化,测其紫外可见吸收光谱。根据颜色变化及紫外可见吸收光谱的变化对维生素B1的浓度进行测定。
图1为加入谷胱甘肽-银纳米材料前后TMB+H2O2体系颜色及吸收光谱变化图。加入银纳米材料后,体系颜色变蓝,在652nm吸收值增高,说明,该纳米材料具有过氧化物酶样活性。
图2为不同pH的醋酸-醋酸钠缓冲溶液对体系催化活性的影响,可以看出,pH为5.5时,催化活性最高。
图3为不同温度对体系催化活性的影响,可以看出,温度为20℃时,催化活性最高。
图4为不同双氧水浓度对体系催化活性的影响,可以看出,双氧水浓度为10M时,催化活性最高。
图5为加入不同浓度维生素B1后,Ag+TMB+H2O2体系颜色及在652nm处吸收随VB1浓度的变化图。随着VB1浓度的增大,颜色变浅,吸收值降低。其中,检测限为:0.01nM,检测范围0-2nM。
图6为加入各种不同维生素后在652nm处的吸收值的变化。只有维生素B1能最大程度抑制银纳米材料的过氧化物酶样活性,所以,该方法可以选择性检测维生素B1。
综上可见,该方法检测维生素B1,样品制备简单,检测过程操作容易,方便非专业人士操作,且具有较高的灵敏度和选择性。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (9)
1.一种利用银纳米材料检测维生素B1的方法,其特征在于:包括以下步骤:
步骤1,银粒子的制备:在AgNO3溶液中加入NaBH4溶液,在水浴锅中搅拌,逐滴加入的谷胱甘肽溶液,于黑暗中继续搅拌,得到谷胱甘肽-银纳米材料;
步骤2:维生素B1的检测:取步骤1制备的谷胱甘肽-银纳米材料,加入不同浓度的维生素B1溶液,再加入醋酸-醋酸钠缓冲溶液,双氧水,3,3',5,5'-四甲基联苯胺溶液,观察溶液颜色变化,测其紫外可见吸收光谱,根据颜色变化及紫外可见吸收光谱的变化对维生素B1的浓度进行测定。
2.根据权利要求1所述的利用银纳米材料检测维生素B1的方法,其特征在于:所述步骤1中,AgNO3溶液的浓度为0.5-1.5mM,NaBH4溶液的浓度为0.01g/mL,谷胱甘肽溶液的浓度为1mM;AgNO3溶液、NaBH4溶液、谷胱甘肽溶液的体积比为25:0.2-0.4:0.4-0.6。
3.根据权利要求1所述的利用银纳米材料检测维生素B1的方法,其特征在于:所述步骤1中,在水浴锅中搅拌时的温度为10-40℃,时间为10min;黑暗中继续搅拌的温度为25℃,时间为2h。
4.根据权利要求1所述的利用银纳米材料检测维生素B1的方法,其特征在于:所述步骤1中,逐滴加入的谷胱甘肽溶液的速率为每分钟40-80滴。
5.根据权利要求1所述的利用银纳米材料检测维生素B1的方法,其特征在于:所述步骤2中,不同浓度的维生素B1溶液的浓度为0,0.01,0.05,0.1,0.2,0.4,0.6,1,1.2,2.0nM。
6.根据权利要求1所述的利用银纳米材料检测维生素B1的方法,其特征在于:所述步骤2中,谷胱甘肽-银纳米材料、维生素B1溶液、缓冲溶液、双氧水、3,3',5,5'-四甲基联苯胺溶液的体积比为8-12:10:10:10:10。
7.根据权利要求1所述的利用银纳米材料检测维生素B1的方法,其特征在于:所述步骤2中,缓冲溶液的pH为3.8-5.6。
8.根据权利要求1所述的利用银纳米材料检测维生素B1的方法,其特征在于:所述步骤2中,双氧水的浓度为1-10M。
9.根据权利要求1所述的利用银纳米材料检测维生素B1的方法,其特征在于:所述步骤2中,3,3',5,5'-四甲基联苯胺溶液的浓度为1-20mM,其中,溶剂为无水乙醇。
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