CN105328203B - 1‑h‑1,2,4‑三氮唑‑3‑硫醇‑牛血清白蛋白‑金纳米团簇荧光材料及其制备方法 - Google Patents
1‑h‑1,2,4‑三氮唑‑3‑硫醇‑牛血清白蛋白‑金纳米团簇荧光材料及其制备方法 Download PDFInfo
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Abstract
本发明公开一种1‑H‑1,2,4‑三氮唑‑3‑硫醇‑牛血清白蛋白‑金纳米团簇荧光材料及其制备方法,以氯金酸、1‑H‑1,2,4‑三氮唑‑3‑硫醇、牛血清白蛋白为原料一步合成水溶性金纳米团簇荧光材料。本发明是一种新型金纳米团簇荧光材料的制备方法,具有制备快速、简单、环保等优点。所合成的1‑H‑1,2,4‑三氮唑‑3‑硫醇‑牛血清白蛋白‑金纳米团簇显示出强烈的玫红色荧光(最大发射波长为650 nm),斯托克斯位移大(245 nm),水溶性好,具有较高的稳定性等优点。
Description
技术领域
本发明涉及1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇荧光材料的制备方法,属于纳米技术领域。
背景技术
近年来,荧光纳米材料作为荧光标记物在生物学中的应用备受关注。目前为止,研究人员已经开发出了半导体量子点、染料掺杂纳米粒子、碳纳米点等多种不同类型的荧光纳米材料。荧光金纳米团簇(gold nanoclusters, AuNCs)作为一类新型的荧光纳米材料,具有光物理性质好、比表面积大、表面易于修饰以及荧光性质可调等优点。金纳米团簇是由几个至几十个金原子组成的稳定聚集体,直径通常小于2 nm,介于单原子和纳米粒子或大体积的金属之间。由于其尺寸接近于电子的费米波长,连续的能态性质分裂为离散的能态,并出现类似分子的尺寸依赖效应。在化合物检测、生物传感与成像、光电子学和纳米医学等领域有着广泛的应用前景。
金纳米团簇荧光材料的制备技术主要包括化学还原法、反相微乳液法、模板合成法单分子层保护技术和配体蚀刻法等。其中单分子层保护技术是一种简易温和的团簇合成方法,利用含一定官能团的小分子作为保护基,在团簇表面形成保护层,从而稳定金纳米团簇,使其不易团聚。近几十年来,国内外的研究者们提出了多种不同的方法制备高荧光量子产率、水溶性好、发光颜色可调的金纳米团簇。
本发明以氯金酸、1-H-1,2,4-三氮唑-3-硫醇、牛血清白蛋白为原料一步合成水溶性金纳米团簇荧光材料。牛血清白蛋白作为稳定剂,1-H-1,2,4-三氮唑-3-硫醇为还原剂和修饰剂控制金纳米团簇的形成。所制备出的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇具有强烈的玫红色荧光,斯托克斯位移大,水溶性好。
发明内容
本发明的目的是提供一种1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇荧光材料及其以1-H-1,2,4-三氮唑-3-硫醇为还原剂和修饰剂,以牛血清白蛋白为稳定剂一步合成金纳米团簇荧光材料的方法。
为了实现上述目的,本发明采用以下技术方案:本发明所述的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇荧光材料的制备方法,其特征是它由以下步骤制成:牛血清白蛋白溶液与氯金酸溶液混合均匀,然后加入1-H-1,2,4-三氮唑-3-硫醇溶液,振摇混匀,反应一定时间得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇,金纳米团簇荧光材料水溶液冷冻干燥后可得到金纳米团簇荧光材料粉末。
所述的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇荧光材料的制备方法,其特征是以牛血清白蛋白作为稳定剂,1-H-1,2,4-三氮唑-3-硫醇为还原剂和修饰剂控制金纳米团簇的形成。
所述的氯金酸溶液、牛血清白蛋白溶液和1-H-1,2,4-三氮唑-3-硫醇溶液的体积比为5:3:2。
所用的氯金酸溶液的浓度可以是1~100 mmol/L,最优选浓度为10 mmol/L,牛血清白蛋白溶液可以是5~500 mg/mL,最优选浓度为50 mg/mL,1-H-1,2,4-三氮唑-3-硫醇溶液的浓度可以是0.01~1 mol/L,最优选浓度为 0.1 mol/L,其中溶解有最优选浓度为0.1mol/L的氢氧化钠。
所述氯金酸溶液、牛血清白蛋白溶液与1-H-1,2,4-三氮唑-3-硫醇溶液混匀后置于4℃反应0.5~2 小时,最优选1 h。
所制得的金纳米团簇材料水溶液为无色,紫外可见光谱在520 nm处无吸收峰。在紫外灯照射下产生强烈的玫红色荧光,最大激发波长和发射波长分别为405 nm和650 nm。
本发明最佳的金纳米团簇荧光材料的制备方法如下:
以下过程中使用的所有玻璃器皿均经过王水浸泡,并用双蒸水彻底清洗,晾干。金纳米团簇荧光材料的制备如下:0.75 mL浓度为50 mg/mL的牛血清白蛋白与1.25 mL浓度为10 mmol/L的氯金酸溶液混合均匀,加入0.5 mL浓度为0.1 mol/L的1-H-1,2,4-三氮唑-3-硫醇溶液(含0.1 mol/L氢氧化钠),振摇混匀,4℃下反应1 h,得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇。所得的金纳米团簇为红棕色的液体,紫外灯(365 nm)照射下有强烈玫红色荧光。
本发明上述的制备方法制得的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇,其特征是易溶于水,水溶液为红棕色,在紫外灯照射下产生强烈的玫红色荧光,最大激发波长和发射波长分别为405 nm和650 nm。
所述金纳米团簇平均粒径为2 nm。
所述的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇,其特征是水溶液在4 ℃暗处下放置2个月无沉降物出现,荧光强度及最大发射峰位置保持不变。
所述的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇,其特征是以氯金酸为金源,1-H-1,2,4-三氮唑-3-硫醇为还原剂和修饰剂,牛血清白蛋白为稳定剂制备。
本发明的优点:
(1)本发明以1-H-1,2,4-三氮唑-3-硫醇为还原剂和修饰剂,在牛血清白蛋白存在的条件下一步合成水溶性金纳米团簇荧光材料,具有制备快速、简单、环保的优点。
(2)本发明所制备的金纳米团簇具有强烈的玫红色荧光(最大发射波长为650nm),较大的斯托克斯位移(245 nm)等特点。
附图说明
图1为金纳米团簇荧光纳米材料在可见光(A)和紫外灯下(B)的外观图。
图2为金纳米团簇荧光纳米材料的紫外-可见吸收光谱图。
图3为金纳米团簇荧光纳米材料的激发和发射光谱图。
图4为金纳米团簇荧光纳米材料的能量散射X射线能谱图。
图5为金纳米团簇荧光纳米材料的透射电镜图。
图6为金纳米团簇荧光纳米材料的X射线光电子能谱图。
具体实施方式
实例1:
0.75 mL浓度为50 mg/mL的牛血清白蛋白与1.25 mL浓度为10 mmol/L的氯金酸溶液混合均匀,加入0.5 mL浓度为0.1 mol/L的1-H-1,2,4-三氮唑-3-硫醇溶液(含0.1 mol/L氢氧化钠),振摇混匀,4℃下反应1 h,得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇。所得的金纳米团簇为红棕色的液体(见图1A),紫外灯照射下产生强烈的玫红色荧光(见图1B)。
实例2:
0.75 mL浓度为50 mg/mL的牛血清白蛋白与1.25 mL浓度为10 mmol/L的氯金酸溶液混合均匀,加入0.5 mL浓度为0.1 mol/L的1-H-1,2,4-三氮唑-3-硫醇溶液(含0.1 mol/L氢氧化钠),振摇混匀,4℃下反应1 h,得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇。所得到的金纳米团簇溶液进行紫外-可见光谱扫描,得其在520 nm波长处无金纳米粒子特征吸收峰(见图2)。
实例3:
0.75 mL浓度为50 mg/mL的牛血清白蛋白与1.25 mL浓度为10 mmol/L的氯金酸溶液混合均匀,加入0.5 mL浓度为0.1 mol/L的1-H-1,2,4-三氮唑-3-硫醇溶液(含0.1 mol/L氢氧化钠),振摇混匀,4℃下反应1 h,得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇。所得到的金纳米团簇溶液进行荧光光谱扫描,得其最大激发波长和发射波长分别为405 nm和650 nm(见图3)。
实例4:
0.75 mL浓度为50 mg/mL的牛血清白蛋白与1.25 mL浓度为10 mmol/L的氯金酸溶液混合均匀,加入0.5 mL浓度为0.1 mol/L的1-H-1,2,4-三氮唑-3-硫醇溶液(含0.1 mol/L氢氧化钠),振摇混匀,4℃下反应1 h,得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇。所得到的金纳米团簇溶液滴涂在铜网上。能量散射X射线能谱分析(见图4)表明产物含有金元素。
实例5:
0.75 mL浓度为50 mg/mL的牛血清白蛋白与1.25 mL浓度为10 mmol/L的氯金酸溶液混合均匀,加入0.5 mL浓度为0.1 mol/L的1-H-1,2,4-三氮唑-3-硫醇溶液(含0.1 mol/L氢氧化钠),振摇混匀,4℃下反应1 h,得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇。所得到的金纳米团簇溶液进行透射电镜的测定,测得金纳米团簇的平均粒径为2nm(见图5)。
实例6:
0.75 mL浓度为50 mg/mL的牛血清白蛋白与1.25 mL浓度为10 mmol/L的氯金酸溶液混合均匀,加入0.5 mL浓度为0.1 mol/L的1-H-1,2,4-三氮唑-3-硫醇溶液(含0.1 mol/L氢氧化钠),振摇混匀,4℃下反应1 h,得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇。所得到的金纳米团簇溶液冷冻干燥后得到粉末,取所得粉末进行X射线光电子能谱测定,XPS Au(4f)显示金的4f7/2峰与4f5/2峰分别位于84.5 eV和88.2 eV,表明金纳米团簇中金的价态以0价和+1价方式共存(见图6)。
Claims (4)
1.一种1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇荧光材料的制备方法,包括以下步骤:0.75 mL浓度为50 mg/mL的牛血清白蛋白与1.25 mL浓度为10 mmol/L的氯金酸溶液混合均匀,加入0.5 mL浓度为0.1 mol/L的其中含有0.1 mol/L氢氧化钠的1-H-1,2,4-三氮唑-3-硫醇溶液,振摇混匀,4℃下反应1小时,得到1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇,所制得的金纳米团簇材料水溶液为红棕色,紫外可见光谱在520nm处无吸收峰,在365 nm紫外灯照射下产生强烈的玫红色荧光,最大激发波长和发射波长分别为405 nm和650 nm。
2.根据权利要求1所述的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇荧光材料的制备方法,其特征是以牛血清白蛋白作为稳定剂,1-H-1,2,4-三氮唑-3-硫醇为还原剂和修饰剂控制金纳米团簇的形成。
3.根据权利要求1所述的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇荧光材料的制备方法,其特征是金纳米团簇平均粒径为2 nm。
4.根据权利要求1所述的1-H-1,2,4-三氮唑-3-硫醇-牛血清白蛋白-金纳米团簇荧光材料的制备方法,其特征是水溶液在4 ℃暗处下放置2个月无沉降物出现,荧光强度及最大发射峰位置保持不变。
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