作为用于推进剂燃料的有毒和挥发性肼衍生物的可行替代品,高离子离子液体(ILs)具有广阔的前景,因此在过去十年中引起了越来越多的关注。为了利用叠氮基团的反应性和高能量密度,合成了一系列低成本且易于制备的叠氮化物官能化阳离子型离子液体,包括富含燃料的阴离子,例如硝酸根,双氰胺和硝基氰酰胺阴离子。和特点。与100%HNO 3接触时,所有基于双氰胺和硝基氰酰胺的离子液体均会自燃。这些高声区IL的密度在1.11–1.29 g cm -3的范围内变化,根据高斯09计算预测的密度比脉冲在289.9到344.9 s g cm -3之间。这两个关键物理特性的值比不对称二甲基肼(UDMH)的值高得多。在研究的化合物中,化合物IL-3b(即1-(2-叠氮基乙基)-1-甲基吡咯烷-1-基二氰胺)具有优异的综合性能,包括最低的粘度(30.9 M Pa s),宽的液体操作范围( -70至205°C),最短的点火延迟时间(7
作为用于推进剂燃料的有毒和挥发性肼衍生物的可行替代品,高离子离子液体(ILs)具有广阔的前景,因此在过去十年中引起了越来越多的关注。为了利用叠氮基团的反应性和高能量密度,合成了一系列低成本且易于制备的叠氮化物官能化阳离子型离子液体,包括富含燃料的阴离子,例如硝酸根,双氰胺和硝基氰酰胺阴离子。和特点。与100%HNO 3接触时,所有基于双氰胺和硝基氰酰胺的离子液体均会自燃。这些高声区IL的密度在1.11–1.29 g cm -3的范围内变化,根据高斯09计算预测的密度比脉冲在289.9到344.9 s g cm -3之间。这两个关键物理特性的值比不对称二甲基肼(UDMH)的值高得多。在研究的化合物中,化合物IL-3b(即1-(2-叠氮基乙基)-1-甲基吡咯烷-1-基二氰胺)具有优异的综合性能,包括最低的粘度(30.9 M Pa s),宽的液体操作范围( -70至205°C),最短的点火延迟时间(7
Copper-Assisted Click Reactions for Activity-Based Proteomics: Fine-Tuned Ligands and Refined Conditions Extend the Scope of Application
作者:Georg C. Rudolf、Stephan A. Sieber
DOI:10.1002/cbic.201300551
日期:2013.12.16
Business as usual: We introduce a customised ABPP click methodology that preserves the native protein fold, accelerates catalysis and is compatible with a greater range of buffers. Requiring no alteration of the established azide/alkyne CuAAC substrates, it is a powerful tool for use in biochemical and proteomic procedures without major alterations to the established protocols.
Effects of Side Group Functionality and Molecular Weight on the Activity of Synthetic Antimicrobial Polypeptides
作者:Amanda C. Engler、Anita Shukla、Sravanthi Puranam、Hilda G. Buss、Nina Jreige、Paula T. Hammond
DOI:10.1021/bm2000583
日期:2011.5.9
The rapid emergence of antibiotic-resistant bacteria along with increasing difficulty in biofilm treatment has caused an immediate need for the development of new classes of antimicrobial therapeutics. We have developed a library of antimicrobial polypeptides, prepared by the ring-opening polymerization of gamma-propargyl-L-glutamate N-carboxyanhydride and the alkyne-azide cycloaddition click reaction, which mimic the favorable characteristics of naturally occurring antimicrobial peptides (AmPs). AmPs are known not to cause drug resistance as well as prevent bacteria attachment on surfaces. The ease and scale of synthesis of the antimicrobial polypeptides developed here are significantly improved over the traditional Merrifield synthetic peptide approaches needed for naturally occurring antimicrobial peptides and avoids the unique challenges of biosynthetic pathways. The polypeptides range in length from 30 to 140 repeat units and can have varied side group functionality, including primary, secondary, tertiary, and quaternary amines with hydrocarbon side chains ranging from 1 to 12 carbons long. Overall, we find these polypeptides to exhibit broad-spectrum activity against both Gram positive and Gram negative bacteria, namely, S. aureus and E. coli, while having very low hemolytic activity. Many of the polypeptides can also be used as surface coatings to prevent bacterial attachment. The polypeptide library developed in this work addresses the need for effective biocompatible therapeutics for drug delivery and medical device coatings.