Novel electrospun luminescent nanofibers from cationic polyfluorene/cellulose acetate blend

This work reports production of nanofibers of cellulose acetate (CA) via electrospinning (ES) technology. Optimal operating conditions to produce nanofibers have been found to involve CA solutions at 20 wt% concentration, flow rate 1.0 mL h^?1, a distance between needle tip-collector target of 15 cm and an applied voltage at 20 kV. Under these experimental conditions, nanofibers were produced by ES a solution containing a low concentration of a luminescent fluorene-based cationic conjugated polyelectrolyte. Electronic and optical microscopies were used to characterize their morphology and the diameter of fibers (over 260 nm). Composite fibers with excellent luminescence properties have been obtained and studied in the solid state. Potential applications in a sensing device for nitrobenzene have been tested.     

Synthesis of the repeating unit of the lipoteichoic acid of Streptococcus pneumoniae

The lipoteichoic acid repeating unit of Streptococcus pneumoniae is a complex pseudopentasaccharide (3). It consists of one ribitol-phosphate, one 2-acetamino-4-amino-2,4,6-trideoxy-galactose, one glucose and two galactosamine residues each differently linked, but both carrying one phosphocholine substituent, at position 6. Suitable building blocks (6–10) for efficient and diastereocontrolled ligations were designed, thus providing, after complete deprotection, the target molecule in high purity. Biological tests revealed that repeating unit 3, lacking the lipid moiety, did not stimulate a pro-inflammatory response in human monocytes (hMNCs).     

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