PubMed · 6867173
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B Cannon. 1983. Scarlet red.. https://doi.org/10.1097/00006534-198307000-00040
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The spectroscopic properties and surface-enhanced spectra of Langmuir-Blodgett (LB) films of methacrylic homopolymer (HPDR13) are presented. It is shown that LB film displays strong fluorescence attributed to the spatial restrictions imposed by its structure. The emission is observed in conjunction with photoisomerization, a process clearly demonstrated by the formation of surface-relief gratings in the LB film [C.R. Mendonça et al., Macromolecules 32 (1999) 1493]. Surface-enhanced Raman scattering (SERS), Surface-enhanced resonance Raman scattering (SERRS) and surface-enhanced fluorescence (SEF) were observed for LB films of HPDR13 deposited onto silver island films. SERS measurements were also carried out on a sample fabricated with one monolayer LB film deposited onto silver islands followed by one overlayer of silver (LB sandwiched between two layers of silver islands). The polymer interacts very weakly with the metal surface (physisorption), and the enhancement effect is determined by the local electric field enhancement. The strong SERS and SERRS signals were suitable for micro-Raman imaging. Line, area mapping and global images of the LB monolayer on silver island are reported. The transfer ratio in the fabrication of the LB suggests a homogeneous coating of the silver islands, thereby the chemical images show the variation of the SERS intensity due to surface enhancement.
We investigated whether physical enhancers of low-level chemiluminescence-coumarin laser dyes C-314, C-334, and C-525--may be used to monitor interactions of lipid peroxyl radicals during lipid peroxidation in live cells. We present data demonstrating that two quinolizin-substituted coumarins--C-525 and C-334--can be integrated into HL-60 cells and successfully used as physical enhancers of chemiluminescence induced by the lipid soluble azo-initiator 2,2'-azobis(2,4-dimethyl-valeronitrile) (AMVN). Coumarins did not inhibit AMVN-induced peroxidation of membrane phospholipids in HL-60 cells, and no consumption of these coumarins occurred in the course of AMVN-induced oxidative stress. Redox status, evaluated by intracellular GSH content, remained unchanged after treatment with the coumarins. tert-Butyl hydroperoxide and cumene hydroperoxide (more hydrophilic oxidants) induced a lower chemiluminescence signal with both coumarins. Viability of HL-60 cells was not affected by coumarins both in the presence and in the absence of oxidants. Based on these results we conclude that quinolizin-substituted coumarins represent a promising class of physical enhancers of chemiluminescence for monitoring free radical peroxidation in live cells.
We report the synthesis of POPAM dendrimers, bearing up to 64 chromophores at their periphery. For these dendrimers, a radiotracer technique was used to study the liquid-liquid partition of pertechnetate and (14)C-labeled nucleotides in trichloromethane-aqueous systems. Inclusion and release of guest molecules can be controlled by changing the pH. The extraction efficacy increases with rising generation number.