A PIID-DTBT based semi-conducting polymer dots with broad and strong optical absorption in the visible-light region： Highly effective contrast agents for multiscale and multi-spectral photoacoustic imaging

作     者：Jian Zhang Haobin Chen Ting Zhou Limei Wang Duyang Gao Xuanjun Zhang Yubin Liu Changfeng Wu Zhen Yuan 

作者机构：Bioimaging Core Faculty of Health Sciences University of Macao Taipa Macao SAR 999078 China State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Jilin 130012 China College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China College of Veterinary Medicine South China Agricultural University Guangzhou 510642 China Center for Drug Non-clinical Evaluation and Research Guangdong Biological Resources Institute Guangdong Academy of Sciences Guangzhou 510900 China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2017年第10卷第1期

页      面：64-76页

核心收录：

学科分类：07[理学] 

基　　金：Acknowledgements This study was supported by the University of Macao in Macao (Nos. MYRG2014-00093-FHS  MYRG 2015-00036-FHS  and MYRG2016-00110-FHS)  Macao government (Nos. FDCT 026/2014/A1 and FDCT 025/2015/A1)  and the National Natural Science Foundation of China (No. 11434017) 

主　　题：nanoparticles polymer dots contrast agents photoacoustic imaging multiscale imaging multi-spectral imaging 

摘      要：As a hybrid imaging technique, photoacoustic imaging （PAI） can provide multiscale morphological information of tissues, and the use of multi-spectral PAI （MSPAI） can recover the spatial distribution of chromophores of interest, such as hemoglobin within tissues. Herein, we developed a contrast agent that can very effectively combine multiscale PAI with MSPAI for a more comprehensive characterization of complex biological tissues. Specifically, we developed novel PIID-DTBT based semi-conducting polymer dots （Pdots） that show broad and strong optical absorption in the visible-light region （500-700 nm）. The performances of gold nanoparticles （GNPs） and gold nanorods （GNRs）, which have been verified as excellent photoacoustic contrast agents, were compared with that of the Pdots based on the multiscale PAI system. Both ex vivo and in vivo experiments demonstrated that the Pdots have better photoacoustic conversion efficiency at 532 nm than GNPs and showed similar photoacoustic performance with GNRs at 700 nm at the same mass concentration. Photostability and toxicity tests demonstrated that the Pdots are photostable and biocompatible. More importantly, an in vivo MSPAI experiment indicated that the Pdots have better photoacoustic performance than the blood and therefore the signals can be accurately extracted from the background of vascular-rich tissues. Our work demonstrates the great potential of Pdots as highly effective contrast agents for the precise localization of lesions relative to the blood vessels based on multiscale PAI and MSPAI.