本文主要研究内容
作者刘芳同(2019)在《基于CdTe量子点的荧光/磁共振双模成像材料的合成研究》一文中研究指出:由于单一成像技术在成像深度、时空分辨率及灵敏度等方面均有各自的优缺点,多种成像技术的联合使用,即将多种成像诊断模式相互融合以达到取长补短、优势互补的目的,能够得到更为真实、准确、全面的诊断结果。近年来,随着医学的进步,多模态融合技术已经成为生物医学成像领域的发展趋势。同时具备荧光/磁共振成像功能的双模光学成像材料同时具备优越的光学成像性能、优秀的超顺磁性、良好的生物相容性以及有效的药物担载等性能,大大提高了检测的灵敏度和准确度,可被应用于细胞标记和分离、药物靶向输送、肿瘤诊断和治疗等领域。已有报道的磁性中心材料多为具有超顺磁性的纳米材料,如Fe3O4、Fe2O3和含钆化合物。由于磁性材料(Fe3O4)易团聚、抗腐蚀性差、难于洗涤且会引起发光粒子的荧光猝灭,而导致荧光强度的降低,使其进一步应用受到了限制。而Gd3+的4f层有7个未成对电子,具有较强的顺磁性,不会引起发光粒子荧光发射强度明显的猝灭,因而含钆化合物被广泛应用于磁共振成像(MRI)。尤其是采用聚丙烯酸、D-葡萄糖醛酸和牛血清白蛋白修饰的氧化钆(Gd2O3)已被用于癌症的MRI诊断。但是研究发现钆基造影剂存在诱发肾细胞的纤维化的风险,为了提高造影剂的临床应用安全性,人们考虑用Mn2+替代Gd3+。目前用于肠道造影的MnCl2(LumenHance?)和肝脏造影的[Mn-DPDP]4-(Teslascan?)已应用于临床诊断。然而游离的Mn2+对人体有一定的毒性,近年来,锰的氧化物(MnO和Mn3O4)作为另一种T1造影剂材料受到关注。本论文以零价铁、氟化钆和四氧化三锰为磁共振成像材料,将CdTe量子点作为荧光成像材料,并将两种材料复合于二氧化硅微球之中,形成稳定球形或囊泡结构,制备出具有良好的磁共振性能、荧光示踪和载药性能的多模态光学成像材料。本文制备了Fe0/无定形磷酸钙(简写ACP)、Fe0/无定形磷酸钙/CdTe量子点复合物、CdTe@SiO2@GdF3复合物、CdTe/Mn3O4/SiO2复合物核壳结构的荧光/磁共振成像双功能微球,并用TEM、EDXA、MRI、红外、荧光光谱等对其结构、磁共振成像和发光性能进行了表征。通过SEM和TEM分析可知所合成的Fe0/ACP粒径为300 nm左右,磁滞回线表明在磁场中可以将该复合物从非磁性材料中分离出来。氮气吸附脱附曲线表明所合成材料具有吸附性能。此外所合成Fe0/ACP复合物被用来吸附CdTe量子点,并采用二级动力学方程对吸附过程进行了分析。吸附产物Fe0/ACP/CdTe量子点复合物采用XRD、FTIR、荧光和磁滞回线进行了表征,结果表明该Fe0/ACP/CdTe量子点复合物不仅具有磁性,而且具有很好的荧光性质;TEM照片显示所合成的CdTe@SiO2@GdF3微球具有明显的球形核壳结构,大量的GdF3以小颗粒形态均匀分散于二氧化硅表层,颗粒尺寸5-8 nm。EDXA分析显示所制备的CdTe@SiO2@GdF3微球表面可检测到Si、O和Gd元素,证明Gd被掺杂到CdTe@SiO2材料之中。荧光发射光谱显示相对于CdTe量子点,CdTe@SiO2@GdF3微球荧光发射光谱发生了一定的红移,但是仍具有良好的荧光性能。MRI分析可知CdTe@SiO2@GdF3微球的弛豫参数(r1)为3.48 s-1(mm)-1,说明所合成的CdTe@SiO2@GdF3微球可用于T1-加权磁共振成像。细胞毒性实验表明,当CdTe@SiO2@GdF3溶液浓度达到200μg/mL时,细胞活力仍可达到90%以上,表明此浓度对细胞的毒性作用较弱;TEM照片显示所合成的CdTe/Mn3O4/SiO2微球具有明显的球形核壳结构。EDXA分析显示所制备的CdTe/Mn3O4/SiO2微球表面只检测到Si和O元素,证明CdTe量子点和Mn3O4纳米立方体被包被于二氧化硅微球之内。荧光发射光谱显示相对于CdTe量子点,CdTe/Mn3O4/SiO2微球荧光发射光谱虽然发生了一定的蓝移,但是仍具有良好的荧光性能。MRI分析可知CdTe/Mn3O4/SiO2微球的弛豫参数(r1)为3.88s-1(mm)-1,说明所合成的CdTe/Mn3O4/SiO2微球可用于T1-加权磁共振成像。细胞毒性实验表明,当CdTe/Mn3O4/SiO2溶液浓度达到300μg/mL时,细胞活力仍可达到90%以上,表明此浓度对细胞的毒性作用较弱。所合成的荧光/磁共振成像双功能微球可以被应用于荧光检测和生物检测等领域。
Abstract
you yu chan yi cheng xiang ji shu zai cheng xiang shen du 、shi kong fen bian lv ji ling min du deng fang mian jun you ge zi de you que dian ,duo chong cheng xiang ji shu de lian ge shi yong ,ji jiang duo chong cheng xiang zhen duan mo shi xiang hu rong ge yi da dao qu chang bu duan 、you shi hu bu de mu de ,neng gou de dao geng wei zhen shi 、zhun que 、quan mian de zhen duan jie guo 。jin nian lai ,sui zhao yi xue de jin bu ,duo mo tai rong ge ji shu yi jing cheng wei sheng wu yi xue cheng xiang ling yu de fa zhan qu shi 。tong shi ju bei ying guang /ci gong zhen cheng xiang gong neng de shuang mo guang xue cheng xiang cai liao tong shi ju bei you yue de guang xue cheng xiang xing neng 、you xiu de chao shun ci xing 、liang hao de sheng wu xiang rong xing yi ji you xiao de yao wu dan zai deng xing neng ,da da di gao le jian ce de ling min du he zhun que du ,ke bei ying yong yu xi bao biao ji he fen li 、yao wu ba xiang shu song 、zhong liu zhen duan he zhi liao deng ling yu 。yi you bao dao de ci xing zhong xin cai liao duo wei ju you chao shun ci xing de na mi cai liao ,ru Fe3O4、Fe2O3he han ga hua ge wu 。you yu ci xing cai liao (Fe3O4)yi tuan ju 、kang fu shi xing cha 、nan yu xi di ju hui yin qi fa guang li zi de ying guang cu mie ,er dao zhi ying guang jiang du de jiang di ,shi ji jin yi bu ying yong shou dao le xian zhi 。er Gd3+de 4fceng you 7ge wei cheng dui dian zi ,ju you jiao jiang de shun ci xing ,bu hui yin qi fa guang li zi ying guang fa she jiang du ming xian de cu mie ,yin er han ga hua ge wu bei an fan ying yong yu ci gong zhen cheng xiang (MRI)。you ji shi cai yong ju bing xi suan 、D-pu tao tang quan suan he niu xie qing bai dan bai xiu shi de yang hua ga (Gd2O3)yi bei yong yu ai zheng de MRIzhen duan 。dan shi yan jiu fa xian ga ji zao ying ji cun zai you fa shen xi bao de qian wei hua de feng xian ,wei le di gao zao ying ji de lin chuang ying yong an quan xing ,ren men kao lv yong Mn2+ti dai Gd3+。mu qian yong yu chang dao zao ying de MnCl2(LumenHance?)he gan zang zao ying de [Mn-DPDP]4-(Teslascan?)yi ying yong yu lin chuang zhen duan 。ran er you li de Mn2+dui ren ti you yi ding de du xing ,jin nian lai ,meng de yang hua wu (MnOhe Mn3O4)zuo wei ling yi chong T1zao ying ji cai liao shou dao guan zhu 。ben lun wen yi ling jia tie 、fu hua ga he si yang hua san meng wei ci gong zhen cheng xiang cai liao ,jiang CdTeliang zi dian zuo wei ying guang cheng xiang cai liao ,bing jiang liang chong cai liao fu ge yu er yang hua gui wei qiu zhi zhong ,xing cheng wen ding qiu xing huo nang pao jie gou ,zhi bei chu ju you liang hao de ci gong zhen xing neng 、ying guang shi zong he zai yao xing neng de duo mo tai guang xue cheng xiang cai liao 。ben wen zhi bei le Fe0/mo ding xing lin suan gai (jian xie ACP)、Fe0/mo ding xing lin suan gai /CdTeliang zi dian fu ge wu 、CdTe@SiO2@GdF3fu ge wu 、CdTe/Mn3O4/SiO2fu ge wu he ke jie gou de ying guang /ci gong zhen cheng xiang shuang gong neng wei qiu ,bing yong TEM、EDXA、MRI、gong wai 、ying guang guang pu deng dui ji jie gou 、ci gong zhen cheng xiang he fa guang xing neng jin hang le biao zheng 。tong guo SEMhe TEMfen xi ke zhi suo ge cheng de Fe0/ACPli jing wei 300 nmzuo you ,ci zhi hui xian biao ming zai ci chang zhong ke yi jiang gai fu ge wu cong fei ci xing cai liao zhong fen li chu lai 。dan qi xi fu tuo fu qu xian biao ming suo ge cheng cai liao ju you xi fu xing neng 。ci wai suo ge cheng Fe0/ACPfu ge wu bei yong lai xi fu CdTeliang zi dian ,bing cai yong er ji dong li xue fang cheng dui xi fu guo cheng jin hang le fen xi 。xi fu chan wu Fe0/ACP/CdTeliang zi dian fu ge wu cai yong XRD、FTIR、ying guang he ci zhi hui xian jin hang le biao zheng ,jie guo biao ming gai Fe0/ACP/CdTeliang zi dian fu ge wu bu jin ju you ci xing ,er ju ju you hen hao de ying guang xing zhi ;TEMzhao pian xian shi suo ge cheng de CdTe@SiO2@GdF3wei qiu ju you ming xian de qiu xing he ke jie gou ,da liang de GdF3yi xiao ke li xing tai jun yun fen san yu er yang hua gui biao ceng ,ke li che cun 5-8 nm。EDXAfen xi xian shi suo zhi bei de CdTe@SiO2@GdF3wei qiu biao mian ke jian ce dao Si、Ohe Gdyuan su ,zheng ming Gdbei can za dao CdTe@SiO2cai liao zhi zhong 。ying guang fa she guang pu xian shi xiang dui yu CdTeliang zi dian ,CdTe@SiO2@GdF3wei qiu ying guang fa she guang pu fa sheng le yi ding de gong yi ,dan shi reng ju you liang hao de ying guang xing neng 。MRIfen xi ke zhi CdTe@SiO2@GdF3wei qiu de chi yu can shu (r1)wei 3.48 s-1(mm)-1,shui ming suo ge cheng de CdTe@SiO2@GdF3wei qiu ke yong yu T1-jia quan ci gong zhen cheng xiang 。xi bao du xing shi yan biao ming ,dang CdTe@SiO2@GdF3rong ye nong du da dao 200μg/mLshi ,xi bao huo li reng ke da dao 90%yi shang ,biao ming ci nong du dui xi bao de du xing zuo yong jiao ruo ;TEMzhao pian xian shi suo ge cheng de CdTe/Mn3O4/SiO2wei qiu ju you ming xian de qiu xing he ke jie gou 。EDXAfen xi xian shi suo zhi bei de CdTe/Mn3O4/SiO2wei qiu biao mian zhi jian ce dao Sihe Oyuan su ,zheng ming CdTeliang zi dian he Mn3O4na mi li fang ti bei bao bei yu er yang hua gui wei qiu zhi nei 。ying guang fa she guang pu xian shi xiang dui yu CdTeliang zi dian ,CdTe/Mn3O4/SiO2wei qiu ying guang fa she guang pu sui ran fa sheng le yi ding de lan yi ,dan shi reng ju you liang hao de ying guang xing neng 。MRIfen xi ke zhi CdTe/Mn3O4/SiO2wei qiu de chi yu can shu (r1)wei 3.88s-1(mm)-1,shui ming suo ge cheng de CdTe/Mn3O4/SiO2wei qiu ke yong yu T1-jia quan ci gong zhen cheng xiang 。xi bao du xing shi yan biao ming ,dang CdTe/Mn3O4/SiO2rong ye nong du da dao 300μg/mLshi ,xi bao huo li reng ke da dao 90%yi shang ,biao ming ci nong du dui xi bao de du xing zuo yong jiao ruo 。suo ge cheng de ying guang /ci gong zhen cheng xiang shuang gong neng wei qiu ke yi bei ying yong yu ying guang jian ce he sheng wu jian ce deng ling yu 。
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