Paramagnetic Polymerized Liposomes: Synthesis, Characterization, and Applications for Magnetic Resonance Imaging
摘要:
Liposomes are biocompatible materials that show promise as vehicles for drug delivery, inhibitors of cell adhesion, and carriers for the introduction of genetic material into cells. In this paper, we describe the synthesis and characterization of a new class of polymerized liposome particles (paramagnetic polymerized liposome (PPL), Figure 1) that have lanthanide ion chelates as head groups and that can be easily visualized using magnetic resonance imaging (MRI). The R(1) molar relaxivity was found to depend primarily on the linker length (m) and on the surface metal density and only weakly on particle size. PPLs containing 10 mol % of compound 1b (m = 2) and 90 mol % of compound 3 had a R(1) = 12.2 mM(-1) s(-1), while PPLs with 10 mol % compound 1a (m = 1) and 90 mol % of compound 3 had a R(1) = 5.7 mM(-1) s(-1). PPLs with 10 mol % of compound 1a and 90 mol % of compound 4 had a R(1) = 8.9 mM(-1) s(-1), while PPLs with 50 mol % of compound 1a and 50 mol % of compound 4 had a R(1) = 4.3 mM(-1) s(-1). A biotinylated lipid (compound 2) was also incorporated into the particle without affecting R(1) relaxivities for use as a marker for histochemical studies. We have also for the first time used atomic force microscopy (AFM) to investigate the size and nature of these particles in an aqueous environment. We feel that these new materials may prove useful for the in vivo investigation of liposome formulations as vehicles for therapeutic applications and for evaluating tissue pathology with MRI.
Selective conversion of nitroarenes using a carbon nanotube–ruthenium nanohybrid
作者:Dhanaji V. Jawale、Edmond Gravel、Caroline Boudet、Nimesh Shah、Valérie Geertsen、Haiyan Li、Irishi N. N. Namboothiri、Eric Doris
DOI:10.1039/c4cc09192b
日期:——
Ruthenium nanoparticles were assembled on carbon nanotubes and the resulting nanohybrid was used in the hydrazine-mediated catalytic hydrogenation of various nitroarenes, at room temperature.
Targeted therapeutic agents, comprising a linking carrier, a therapeutic entity associated with the linking carrier, and at least one targeting entity are provided, as well as methods for their preparation and use.
Turning over silanes: The first nanotube‐based catalytic system for silaneoxidation is reported (see scheme). The reusable gold–nanotube hybrid cleanly oxidizes both alkyl and aryl silanes in high yields, under mild reaction conditions, and compares most favorably to any other catalytic system in terms of overall efficacy and turnover values.
열적 특성이 개선된 도펀트 제조방법 및 이에 따라 제조된 도펀트를 포함하는 전도성 나노 복합체
申请人:LOTTE CHEMICAL CORPORATION 롯데케미칼 주식회사(119980046011) Corp. No ▼ 110111-0193196BRN ▼118-81-15012
公开号:KR20190064339A
公开(公告)日:2019-06-10
본 발명은 열적 특성이 개선된 도펀트 제조방법 및 이에 따라 제조된 도펀트를 포함하는 전도성 나노 복합체에 관한 것으로, 보다 상세하게는 폴리아닐린에 도핑하여 우수한 전기전도성 및 열적 특성을 나타내는 도펀트 제조방법 및 이에 따라 제조된 도펀트 및 폴리아닐린을 포함하는 전도성 나노 복합체에 관한 것이다. 본 발명에서는 도펀트의 열적안정성을 개선하기 위해 다이아세틸렌 유도체의 한쪽 말단기를 술폰산(sulfonic acid) 또는 벤젠술폰산(Benzenesulfnoic acid)으로 치환하여 술폰산 그룹에 의해 우수한 도핑 특성을 가지며 증가된 아로마틱(Aromatic), 알리파틱(Aliphatic) 그룹으로 인하여 열적안정성이 증가된 도펀트를 우수한 수율로 제조할 수 있는 방법을 제공할 수 있다.
Synthesis of 1,3-Diynes in the Purine, Pyrimidine, 1,3,5-Triazine and Acridine Series
作者:W. Edward Lindsell、Christopher Murray、Peter N. Preston、Thomas A.J. Woodman
DOI:10.1016/s0040-4020(00)00016-8
日期:2000.2
groups as terminal heterocyclic substituents in both R1 and R2 are bonded through methylene linkers (CH2)n, n=1, 4 or 9} to the 1,3-diyne; also reported are amphiphilic species with R2=n-C10H21 and a single heteroaromatic head group in chain R1. Compounds in the acridine series are also amphiphiles and contain quaternised 1′-(9-acridinylamino)- and 1′-(6-chloro-2-methoxyacridinylamino)- terminal substituents
一系列共轭的1,3-二炔的,R 1 CCCCR 2,已准备了包含以下的杂芳族单元作为取代基的头部基团R 1和/或R 2:嘧啶基,嘌呤基,2,4-二氨基-1,3,5-三嗪基和a啶基。在R 1和R 2中均含有前三个基团作为末端杂环取代基的化合物通过亚甲基接头(CH 2)n,n = 1、4或9}键合至1,3-二炔;还报道了R 2 = n -C 10 H 21的两亲物种和在链R 1中的单个杂芳族头基。cr啶系列中的化合物也是两亲性的,并包含季铵化的1'-(9-ac啶基氨基)-和1'-(6-氯-2-甲氧基ac啶基氨基)-通过PEG和亚甲基单元连接至二炔功能的末端取代基。新的二炔是通过相应的ω-杂芳族官能化的1-炔的氧化偶合或通过预先形成的二炔上末端基团的转化而合成的。