Histidine–dialkoxyanthracene dyad for selective and sensitive detection of mercury ions
作者:Sachin Patil、Widad Belhajjame、Basem Moosa、Niveen M. Khashab
DOI:10.1080/10610278.2017.1412438
日期:2018.4.3
fluorescent sensor for fast and sensitive detection of mercuryions (Hg2+) in aqueous media. The two histidine moieties act as ‘claws’ to selectively complex Hg2+. The binding ratio of HDA to Hg2+ was 1:1 (metal-to-ligand ratio). The association constant for Hg2+ towards the receptor HDA obtained from Benesi–Hildebrand plot was found to be 3.22 × 104 M−1 with detection limit as low as 4.7 nM (0.94 μg/L).
‘Caged’ peptide nucleic acids activated by red light in a singlet oxygen mediated process
作者:Sandra G. König、Andriy Mokhir
DOI:10.1016/j.bmcl.2013.11.003
日期:2013.12
Common ‘caged’ nucleicacidbinders, which can be applied for temporal and spatial control of gene expression, are activated by high energy light (<450 nm). The light of this type is damaging to cells and is strongly absorbed by cellular components. Therefore, shifting the triggering light to the visible region (>550 nm) is highly desirable. Herein we report on a cyclic peptide nucleicacid (PNA), whose
可以用于基因表达的时间和空间控制的常见“笼状”核酸结合剂被高能光(<450 nm)激活。这种类型的光会损害细胞,并被细胞成分强烈吸收。因此,非常需要将触发光转移到可见光区域(> 550 nm)。在本文中,我们报道了环肽核酸(PNA),其主链包含9,10-二烷氧基取代的蒽接头。选择该化合物的序列以与代表性的microRNA(miR-92)互补。我们证明了环状PNA不结合互补核酸,因此是“笼中的”。可以通过在焦脱镁叶绿酸-a存在下暴露于红光(635 nm)来进行解开盖。后一过程由单线态氧介导(1 O 2),其在PNA内裂解9,10-二烷氧基蒽连接基并形成线性PNA,线性PNA是互补核糖核酸的有效结合剂。这是红光激活的“笼中”肽核酸的第一个例子。
A photopolymerization sensitizer may not cause problems of dusting or coloring of a cured product due to bleeding of additives such as the photopolymerization sensitizer on the surface, e.g., by blooming at the time of photo-curing or during storage of the cured product, and which provides a practically sufficient photo-curing rate. A 9,10-bis(alkoxycarbonylalkyleneoxy)anthracene compound having ester groups, of formula (I):
wherein A is a C
1-20
alkylene group, optionally branched by an alkyl group, R is a C
1-20
alkyl group, optionally branched by the alkyl group, the C
1-20
alkyl group optionally being a cycloalkyl group or a cycloalkylalkyl group, and X and Y are independently a hydrogen, a C
1-8
alkyl group, or a halogen.