phase-selective monopeptide-based organogelators readily made at low cost, we identified five of them with high gelling ability toward aprotic aromatic solvents in the powder form. The best of them (Fmoc-V-6) is able to instantly and phase-selectively gel benzene, toluene, and xylenes in the presence of water at room temperature at a gelator loading of 6% w/v. This enables the gelled aromatics to be separated
通过对35种可能容易以低成本制备的基于相选择单肽的有机胶凝剂进行组合筛选,我们确定了其中5种对粉末状非质子芳族溶剂具有高胶凝能力。它们中最好的(Fmoc - V - 6)能够在室温下以6%w / v的胶凝剂负载下,在水的存在下,即时选择性地凝胶化苯,甲苯和二甲苯。这使得可以通过过滤分离凝胶化的芳族化合物,并且可以通过蒸馏来回收芳族化合物和胶凝材料。我们还确定了Fmoc-I-16作为苯甲醇的最佳胶凝剂,相应的有机凝胶可有效地从其高浓度水溶液中去除有毒染料分子82-99%。这些有效去除水中有毒有机溶剂和染料的方法表明,它们在修复受污染的水资源方面具有广阔的应用前景。
Combinatorial Evolution of Fast-Conducting Highly Selective K<sup>+</sup>-Channels via Modularly Tunable Directional Assembly of Crown Ethers
作者:Changliang Ren、Jie Shen、Huaqiang Zeng
DOI:10.1021/jacs.7b04335
日期:2017.9.13
of highly efficient K+-selective channels. In our strategy, a highly robust supramolecular H-bonded 1D ensemble was used to order the appended crownethers in such a way that they roughly stack on top of each other to form a channel for facilitated ion transport across the membrane. Among 15 channels that all prefer K+ over Na+ ions, channel molecule 5F8 shows the most pronounced optimum for K+ while
Reaction of Thioacids with Isocyanates and Isothiocyanates: A Convenient Amide Ligation Process
作者:David Crich、Kaname Sasaki
DOI:10.1021/ol901370y
日期:2009.8.6
Thiocarboxylates, prepared conveniently by cleavage of 9-fluorenylmethyl or trimethoxybenzyl thioesters, react at room temperature with isocyanates and isothiocyanates to give amide bonds in good to excellent yield. A carboxylate salt is also shown to react with an electron-deficient isocyanate to give the corresponding amide in excellent yield at room temperature.
We describe here a unique family of pore-forming anion transporting peptides possessing a single-amino-acid-derived peptidic backbone that is the shortest among natural and synthetic pore-forming peptides. These monopeptides with built-in H-bonding capacity self-assemble into an H-bonded 1D columnar structure, presenting three types of exteriorly arranged hydrophobic side chains that closely mimic the overall topology of an alpha-helix. Dynamic interactions among these side chains and membrane lipids proceed in a way likely similar to how a-helix bundle is formed. This subsequently enables oligomerization of these rod-like structures to form ring-shaped ensembles of varying sizes with a pore size of smaller than 1.0 nm in diameter but sufficiently large for transporting anions across the membrane. The intrinsic high modularity in the backbone further allows rapid tuning in side chains for combinatorial optimization of channel's ion-transport activity, culminating in the discovery of an exceptionally active anion-transporting monopeptide 6L10 with an EC50 of 0.10 mu M for nitrate anions.