The binding dynamics of the 2-aminoanthracenium cation (AH(+)) and 2-aminoanthracene (A) with cucurbit[7]uril (CB[7]) was studied using stopped-flow experiments. The kinetics was followed by measuring the fluorescence changes over time for AH(+) and A, which emit at different wavelengths. The studies at various pH values showed different mechanisms for the formation of the AH(+)@CB[7] complex, ...

The synthesis of [2]rotaxanes, each comprising a viologen core threaded through a cucurbit[8]uril (Q8, Figure 1) macrocycle and stoppered by tetraphenylmethane groups, and their binding to second guests as inclusion complexes in organic and aqueous media are described. Stoppering was observed to have little effect on binding. Chemical modification of the threaded guest was used to control solub...

This research put forward a simple and rapid fluorescence probe method based on competition strategy to detect homocysteine. The host–guest interaction behavior between cucurbit[7]uril homocysteine was further studied via UV–vis spectroscopy, Fourier transform infrared molecular modeling, 1H NMR spectroscopy in aqueous solution. Under the optimal detection conditions, intensity of cucurbit[7]ur...

Cucurbit yellow stunting disorder virus (CYSDV), a bipartite whitefly-transmitted virus, constitutes a major threat to commercial cucurbit production worldwide. Here, construction of full-length CYSDV RNA1 and RNA2 cDNA clones allowed the in vitro synthesis of RNA transcripts able to replicate in cucumber protoplasts. CYSDV RNA1 proved competent for replication; transcription of both polarities...

In this study, a novel UV-responsive drug carrier based on mesoporous silica nanoparticles (MSNs) has been designed. A 'self' peptide was introduced onto the MSN surface through a supramolecular photoswitchable heteroternary complexation of cucurbit[8]uril, azobenzene and 4,4'-dipyridyl derivative. The light-induced isomerization of azobenzene contributed to the formation of intelligent cucurbi...

Simultaneous quantification of drug isomers, methylxanthines (MeX), by SERS via self-assembly gold nanoparticles (Au NPs) mediated cucurbit[ n ]urils (CBs).

Self-assembly has emerged as a powerful approach to generating complex supramolecular architectures. Despite there being many crystalline frameworks reported in the solid state, the construction of highly soluble periodic supramolecular networks in a three-dimensional space is still a challenge. Here we demonstrate that the encapsulation motif, which involves the dimerization of two aromatic un...

Background: Cucurbit aphid-borne yellows virus (CABYV) is among the most important yellowing viruses on cucurbits in Iran. The presence of CABYV has been previously reported from the major cucurbit growing areas in Iran, however, there are few studies concerning the detection of the diff erent strains of this virus in the grower’s fi elds, and especially, there is no report of ...

Based on results obtained with leaf discs exposed to sulfate, leaves on cucurbit plants (Cucurbitapepo L. cv Small Sugar Punpkn and Cucuzs sativws cv Chipper) 1 to 2.5 weeks old have a low potential for H2S emission (less than 10 pkomoles per min per cm2 leaf area) in response to sulfate, whereas discs from most of the leaves on plants 3 to 4 weeks old emit H2S at a higher rate (50 to 150 picom...