Synthesis and biological evaluation of natural methyl ester, lactone and their synthetic analogs.

(2)- methyl ester and (4)- lactone were recently identified as major components in essential oils and extracts of from Togo. Extended biological evaluation of these acetylenic compounds was however hampered by the reduced amounts isolated. A synthetic route was designed providing access to larger quantities of these two natural products as well as to original non-natural analogs with the prospect of exploring for the first time the structure-activity relationships in this series.

Novel N-Br Bond-Containing -Halamine Nanofibers with Antibacterial Activities.

-Halamine compounds have attracted great attention because they are recognized as promising antibacterial agents to control microbial contamination; however, most of the research interests were focused on -halamines that contain N-Cl bond(s) rather than N-Br bond(s). In this contribution, we report the facile fabrication of N-Br bond-containing -halamine nanofibers using the electrospinning method for antibacterial usages. The as-produced N-Br bond-containing -halamine nanofibers (i.

N-Halamine-Containing Electrospun Fibers Kill Bacteria via a Contact/Release Co-Determined Antibacterial Pathway.

N-Halamine-based antibacterial materials play a significant role in controlling microbial contamination, but their practical applications are limited because of their complicated synthetic process and indistinct antibacterial actions. In this study, novel antibacterial N-halamine-containing polymer fibers were synthesized via an one-step electrospinning of N-halamine-containing polymers without any additives. By adjusting the concentration of precursor and the molecular weight of polymers, the morphology and size of the as-spun N-halamine-containing fibers can be regulated.

Insight into Biological Effects of Zinc Oxide Nanoflowers on Bacteria: Why Morphology Matters.

Zinc oxides have gained exciting achievements in antimicrobial fields because of their advantageous properties, whereas their biological effects on bacteria are currently underexplored. In this study, biological effects of flower-shaped nano zinc oxides on bacteria were systematically investigated. Zinc oxide nanoflowers with controllable morphologies (viz.

Decorating CdTe QD-Embedded Mesoporous Silica Nanospheres with Ag NPs to Prevent Bacteria Invasion for Enhanced Anticounterfeit Applications.

Quantum dots (QDs) as potent candidates possess advantageous superiority in fluorescence imaging applications, but they are susceptible to the biological circumstances (e.g., bacterial environment), leading to fluorescence quenching or lose of fluorescent properties.

Strategy to control the chromism and fluorescence emission of a perylene dye in composite organogel phases.

Composite organogels based on 1,3,5-tris(4-dodecyloxybenzoylamino)phenylbenzene (DBAPB), a known gelator, and N,N'-di(octadecyl)-perylene-3,4,9,10-tetracarboxylic diimide (C18PTCDI), a nongelator dye, have been achieved, leading to controllable color and emitting color changes. SEM images and XRD patterns revealed that the packing of the DBAPB-based gelator could almost be maintained in the composite gels. The temperature-dependent UV-vis absorption and temperature-dependent fluorescence emission spectra illustrated that the color and emitting color of the composite gels could be controlled by the content of C18PTCDI as well as the temperature in the gel phases.