Fluorescent core-sheath fibers by electrospinning of a phenyleneethynylene/poly(styrene-co-maleimide) blend

García, Lizeth Adriana; Arias, Eduardo; Moggio, Ivana; Romero‐García, Jorge; Ledezma, Antonio; Ponce, Arturo; Pérez, Odilia

doi:10.1016/j.polymer.2011.09.029

Cited by 11 publications

(8 citation statements)

References 29 publications

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“…Furthermore, the presence of other functional groups in the molecule susceptible to the hydrolysis conditions must be taken into account. Here, we first prepared step-by-step oligomers having three phenyleneethynylene units and terminated with one ( 9 , Scheme 1 ) or two ( 14 , Scheme 2 ) benzyl-protected carboxylic acids by Pd/Cu cross-coupling [ 26 ] of monomer 5 [ 27 ] with one or two equivalents of 6 to give the bromo-terminated dimer 7 [ 28 ] that was then Pd/Cu cross-coupled with 4 ( Scheme S1 ) to give the carboxylic acid benzyl-protected trimer 8 or the symmetric benzyl-protected terminated oligomer 13 ( Scheme 2 ). After evaluating different methods and conditions to cleave the benzyl group and to carry out the amidation reactions (ESI), the acid groups were deprotected by using KOH and toluene under nitrogen atmosphere in yields higher than 85% and without the detection of any traces of oxidized ethynylene groups.…”

Section: Resultsmentioning

confidence: 99%

Supramolecular Recognition of Escherichia coli Bacteria by Fluorescent Oligo(Phenyleneethynylene)s with Mannopyranoside Termini Groups

Arias¹,

Méndez²,

Arias³

et al. 2017

Sensors

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Escherichia coli is one the most common bacteria responsible of uropathogenic diseases, which motives the search for rapid and easy methods of detection. By taking advantage of the specific interactions between mannose and type 1 fimbriae, in this work two fluorescent phenyleneethynylene (PE) trimers bearing one or two 4-aminophenyl-α-D-mannopyranoside termini groups were synthesized for the detection of E. coli. Three bacterial strains: ORN 178 (fimbriae I expression), ORN 208 (mutant serotype with no fimbriae expression) and one obtained from a local hospital (SS3) were used. Laser Scanning Confocal Microscopy (LSCM) and Surface Plasmon Resonance (SPR) were applied for the interaction studies following two different approaches: (1) mixing the oligomer solutions with the bacterial suspension, which permitted the observation of stained bacteria and by (2) biosensing as thin films, where bacteria adhered on the surface-functionalized substrate. LSCM allows one to easily visualize that two mannose groups are necessary to have a specific interaction with the fimbriae 1. The sensitivity of SPR assays to E. coli was 104 colony forming unit (CFU)/mL at 50 µL/min flow rate. The combination of PE units with two mannose groups results in a novel molecule that can be used as a specific fluorescent marker as well as a transducer for the detection of E. coli.

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Section: Resultsmentioning

confidence: 99%

Supramolecular Recognition of Escherichia coli Bacteria by Fluorescent Oligo(Phenyleneethynylene)s with Mannopyranoside Termini Groups

Arias¹,

Méndez²,

Arias³

et al. 2017

Sensors

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“…The synthesized micro/nanofibers with various morphologies including core–sheath, hollow, porous, nanoribbons, and multilayered mates have been produced and shown great potentials in tissue engineering, filtration, textile manufacturing, sensors, electronics, catalysis, energy storage, etc. Despite its advantages such as high surface area/volume ratios, its porosity as well as composition could be manipulated for desired properties and functions . The entangled fibers with heat treatment generate great amount of open pores and large voids for more heavy metal active sites, resulting in enhanced sensing performances …”

Section: Synthesis Methods Of Novel Electrode Materials For Electrochmentioning

confidence: 99%

“…Despite its advantages such as high surface area/volume ratios, its porosity as well as composition could be manipulated for desired properties and functions . The entangled fibers with heat treatment generate great amount of open pores and large voids for more heavy metal active sites, resulting in enhanced sensing performances …”

Section: Synthesis Methods Of Novel Electrode Materials For Electrochmentioning

confidence: 99%

Recent Advances and Perspective on Design and Synthesis of Electrode Materials for Electrochemical Sensing of Heavy Metals

Hou

Zeinu

Gao

et al. 2018

Energy & Environ Materials

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The increase in release of toxic heavy metals into natural water attracts much attention due to its devastating effect on ecology and human health. The design and implementation of green electrode materials is pivotal for improving the electrochemical performance of in situ heavy metal monitoring. This work reviews various novel electrode materials and hybrid materials that improve electrochemical detection. Modified green and novel electrode materials offer better performance due to their improved deposition with wide linear and enhanced response under optimized sensing parameters. In particular, recent works related to gold, carbon materials, bismuth, and metal oxide‐based electrodes are reviewed. The environmentally friendly (“green”) characteristics, as well as their versatility and flexibility, are especially emphasized. In addition, synthesis methods and novel designs of electrode integration are highlighted. Most of the substantial achievements as well as breakthroughs in recent years are surveyed, and the challenges and prospective in this field are also identified.

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“…Benzyl 4‐Iodobenzoate (2d): 13 Following the general procedure for benzylation under acidic conditions, the title compound was obtained as a colorless crystalline solid (175 mg, 86 %), m.p. 66.4 °C.…”

Section: Methodsmentioning

confidence: 99%

O‐Benzylation of Carboxylic Acids Using 2,4,6‐Tris(benzyloxy)‐1,3,5‐triazine (TriBOT) under Acidic or Thermal Conditions

et al. 2015

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Metal–organic polyhedra (MOPs) or frameworks (MOFs) based on Cr3+ are notoriously difficult to synthesize, especially as crystals large enough to be suitable for characterization of the structure or properties. It is now shown that the co‐existence of In3+ and Cr3+ induces a rapid crystal growth of large single crystals of heterometallic In‐Cr‐MOPs with the [M8L12] (M=In/Cr, L=dinegative 4,5‐imidazole‐dicarboxylate) cubane‐like structure. With a high concentration of protons from 12 carboxyl groups decorating every edge of the cube and an extensive H‐bonded network between cubes and surrounding H2O molecules, the newly synthesized In‐Cr‐MOPs exhibit an exceptionally high proton conductivity (up to 5.8×10−2 S cm−1 at 22.5 °C and 98 % relative humidity, single crystal).

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Fluorescent core-sheath fibers by electrospinning of a phenyleneethynylene/poly(styrene-co-maleimide) blend

Cited by 11 publications

References 29 publications

Supramolecular Recognition of Escherichia coli Bacteria by Fluorescent Oligo(Phenyleneethynylene)s with Mannopyranoside Termini Groups

Supramolecular Recognition of Escherichia coli Bacteria by Fluorescent Oligo(Phenyleneethynylene)s with Mannopyranoside Termini Groups

Recent Advances and Perspective on Design and Synthesis of Electrode Materials for Electrochemical Sensing of Heavy Metals

O‐Benzylation of Carboxylic Acids Using 2,4,6‐Tris(benzyloxy)‐1,3,5‐triazine (TriBOT) under Acidic or Thermal Conditions

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