CN114735674A - 一种可释放硫化氢气体的碳量子点及其制备方法 - Google Patents
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Abstract
本发明涉及一种可释放硫化氢气体的碳量子点及其制备方法。本发明的碳量子点能响应性释放硫化氢气体,其制备方法包括如下步骤:将二硫苏糖醇与乙二胺混合后溶解于水中,超声混匀后,将所得的混合溶液放入水热釜中加热反应,冷却至室温后,用0.22μm的膜过滤,将所得的滤液透析,冻干后即得目标产物碳量子点。于KOH溶液中加入本发明制备的碳量子点,混合均匀后,观察溶液状态变化,若溶液中生成红色络合物,则表明生成硫化氢气体。本发明制备的碳量子点,没有经过钝化和改性,没有毒性,不仅可以作为药物载体,同时具有荧光特性,可以实时追踪碳量子点的摄取情况,可后续应用于生物医药等领域,具有很大的应用前景。
Description
技术领域
本发明属于纳米碳材料技术领域,具体涉及一种可释放硫化氢气体的碳量子点及其制备方法。
背景技术
近年来的研究表明,内源性硫化氢(H2S)参与了机体多器官系统的功能调节过程,是继一氧化氮(NO)和一氧化碳(CO)后第三种气体信使分子,其生理学和病理生理学意义是现今学术界研究的热点。目前,实验研究H2S生物学效应时主要用的是H2S饱和溶液及H2S供体硫氢化钠(NaHS)。H2S饱和溶液不稳定,配制时需通风,易中毒。内源性H2S生成体系下调表现为血浆(或血清)中H2S水平降低,病变组织局部H2S含量和产率降低,病变组织中H2S生成酶的活性和蛋白表达降低,补充H2S气体或H2S供体可不同程度地改善或缓解疾病发病。对内源性H2S生成体系上调相关的疾病,H2S生成酶的抑制剂有一定的防治作用。目前,以内源性H2S为“靶的”对疾病的诊断、预警、预防和治疗意义的研究受到了临床医学的高度关注。
碳量子点具有优秀的光学性质,良好的水溶性、低毒性、环境友好、原料来源广、成本低、生物相容性好等诸多优点。碳量子点的结构和组成决定了它们性质的多样性。碳量子点比较明显的一个特征就是在紫外光区有较强的吸收峰,并且在可见光区域有长拖尾。大多数吸收峰带集中在260~320nm,通常表现出荧光最大发射波长、激发波长依赖性等光学特征。
目前,可检测响应性释放硫化氢气体的碳量子点体系还未见报道。
发明内容
为解决上述问题,本发明提供一种可释放硫化氢气体的碳量子点及其制备方法。
本发明采用的技术方案为:
一种可释放硫化氢气体的碳量子点,所述的碳量子点能响应性释放硫化氢气体。
上述的一种可释放硫化氢气体的碳量子点的制备方法,包括如下步骤:
1)将二硫苏糖醇与乙二胺混合后溶解于水中,超声,形成均匀分散的混合溶液;
2)将步骤1)所得的混合溶液放入水热釜中加热反应;
3)将经步骤2)处理得到的溶液冷却至室温后,用0.22μm的膜过滤,得滤液;
4)将步骤3)所得的滤液透析,-15℃冻干后即得目标产物碳量子点。
优选的,上述的制备方法,步骤1)中,所述混合溶液中二硫苏糖醇的浓度为77.1g/L,乙二胺的浓度为30g/L,二硫苏糖醇与乙二胺的摩尔比为1:1。
优选的,上述的制备方法,步骤1)中,所述超声时间为15min。
优选的,上述的制备方法,步骤2)中,所述加热反应的条件:温度为200℃,时间为5h。
优选的,上述的制备方法,步骤4)中,所述透析的条件:透析袋截流分子量为500D,透析时间为24h。
一种检测响应性释放硫化氢气体的方法,方法如下:于溶剂中加入权利要求1所述的一种可释放硫化氢气体的碳量子点,混合均匀后,观察溶液中有红色络合物生成。
优选的,上述一种检测响应性释放硫化氢气体的方法,所述溶剂为KOH溶液。
优选的,上述一种检测响应性释放硫化氢气体的方法,所述KOH溶液的质量浓度为40%。
优选的,上述一种检测响应性释放硫化氢气体的方法,所述碳量子点和溶剂的添加比例为0.01g:5mL。
本发明的有益效果为:
1、本发明中,二硫苏糖醇被氧化后变为包含二硫键的六元环状结构,可通过一锅法形成碳量子点。
2、本发明制备的碳量子点,可以通过便宜的材料和简单的步骤得到。
3、本发明制备的碳量子点,没有经过钝化和改性,没有毒性,不仅可以作为药物载体,同时具有荧光特性,可以实时追踪碳量子点的摄取情况,可后续应用于生物医药等领域,具有很大的应用前景。
附图说明
图1是实施例1制备的碳量子点的透射电镜图。
图2是实施例1制备的碳量子点的高分辨率透射电镜图。
图3是实施例1制备的碳量子点在乙醇溶液中的荧光光谱图。
图4是实施例1制备的碳量子点的XRD图。
图5是实施例1制备的碳量子点在乙醇溶液中的紫外吸收图。
图6是实施例1制备的碳量子点浓度和硫化氢气体释放的标准曲线。
图7是实施例1制备的碳量子点随时间硫化氢气体释放曲线。
具体实施方式
为了更好地解释本发明,下面通过实施例对本发明做进一步说明,应理解以下实施目的在于更好地解释本发明的内容,而不是对本发明的保护范围产生任何限制。
实施例1一种可释放硫化氢气体的碳量子点的制备
(一)制备方法包括如下步骤
1)将0.771g(0.005mol)二硫苏糖醇与0.3g(0.005mol)乙二胺混合后溶解于10mL水中,超声15min,形成均匀分散的混合溶液;
2)将步骤1)所得的混合溶液放入20mL水热釜中200℃加热反应5h;
3)将经步骤2)处理得到的溶液冷却至室温后,用0.22μm的膜过滤,得滤液;
4)将步骤3)所得的滤液用500D的透析袋透析24h,-15℃冻干后即得目标产物碳量子点。
(二)检测
图1是碳量子点的透射电镜图,由图1可知,本发明制备的碳量子点在乙醇溶液中均匀分散。
图2是碳量子点的高分辨率透射电镜图,由图2可知,本发明制备的碳量子点平均直径为4nm,具有0.21nm晶格间距。
图3是碳量子点在乙醇溶剂中的荧光光谱图。由图3可知,本发明制备的碳量子点的发射波长为540nm。
图4是碳量子点的XRD图。由图4可知,在22°处有一个清晰的峰,对应石墨碳的(100)晶面。
图5是碳量子点在乙醇溶液中的紫外吸收图。由图5可知,碳量子点的吸收光谱在284nm、415nm处表现出较强的激子吸收带,这些吸收带分别来自于芳香sp2域(C=C,C-C)的π-π*跃迁和多共轭C=O和C=n的n-π*跃迁。
实施例2一种检测响应性释放硫化氢气体的方法
将0.01g实施例1制备的碳量子点与5mL 40%KOH溶液混合均匀,观察溶液状态变化,若溶液中生成红色络合物,则表明生成硫化氢气体。使用硫化氢气体探测器检测硫化氢气体生成的量。
图6是实施例1制备的碳量子点浓度和硫化氢气体释放的标准曲线。由图6可知,碳量子点浓度和硫化氢气体释放成正相关。
图7是实施例1制备的碳量子点随时间硫化氢气体释放曲线。由图7可知,在溶液的pH为6.500和7.400下,随时间的增长,硫化氢气体释放量逐渐增加,24h后停止释放。
Claims (10)
1.一种可释放硫化氢气体的碳量子点,其特征在于,所述的碳量子点能响应性释放硫化氢气体。
2.权利要求1所述的一种可释放硫化氢气体的碳量子点的制备方法,其特征在于,包括如下步骤:
1)将二硫苏糖醇与乙二胺混合后溶解于水中,超声,形成均匀分散的混合溶液;
2)将步骤1)所得的混合溶液放入水热釜中加热反应;
3)将经步骤2)处理得到的溶液冷却至室温后,用0.22μm的膜过滤,得滤液;
4)将步骤3)所得的滤液透析,-15℃冻干后即得目标产物碳量子点。
3.根据权利要求2所述的制备方法,其特征在于,步骤1)中,所述混合溶液中二硫苏糖醇的浓度为77.1g/L,乙二胺的浓度为30g/L,二硫苏糖醇与乙二胺的摩尔比为1:1。
4.根据权利要求2所述的制备方法,其特征在于,步骤1)中,所述超声时间为15min。
5.根据权利要求2所述的制备方法,其特征在于,步骤2)中,所述加热反应的条件:温度为200℃,时间为5h。
6.根据权利要求2所述的制备方法,其特征在于,步骤4)中,所述透析的条件:透析袋截流分子量为500D,透析时间为24h。
7.一种检测响应性释放硫化氢气体的方法,其特征在于,方法如下:于溶剂中加入权利要求1所述的一种可释放硫化氢气体的碳量子点,混合均匀后,观察溶液中有红色络合物生成。
8.根据权利要求7所述的一种检测响应性释放硫化氢气体的方法,其特征在于,所述溶剂为KOH溶液。
9.根据权利要求8所述的一种检测响应性释放硫化氢气体的方法,其特征在于,所述KOH溶液的质量浓度为40%。
10.根据权利要求9所述的一种检测响应性释放硫化氢气体的方法,其特征在于,所述碳量子点和溶剂的添加比例为0.01g:5mL。
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