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A Ti–H 2 O 2 –phenol complex, not described until now, has been identified on the surface of Degussa P-25 and the new catalyst ECT-1023. This complex is considered to be responsible for the higher hydroquinone to catechol concentration ratio. It has been also shown that phenolates identified on the surface modify electrodonation that controls the generation of activating positions...
We present the first observation of photocatalytically driven, hydrogen peroxide mediated, dissolution of a macroscopic metal surface. Specifically, we report on the dissolution of silver in the presence of photocatalytically generated H 2 O 2 produced by ultra-band gap illumination of TiO 2 at 365nm in the presence of O 2 . Direct measurements of photocatalytically...
Copper in lysosomes is closely related to age and development of liver damage. A new fluorescent lysosomes-specific Cu 2+ -sensing probe was synthesized, and used for optical imaging in HL-7702 and HepG2 cells. Based on the difference in structure between spirocyclic (non-fluorescent) and open-cycle (fluorescent) forms, the probes showed an 80-fold fluorescence increase upon the addition of...
A kinetic study on singlet oxygen ( 1 O 2 ) quenching by 4-hydroxycinnamic acid derivatives (ferulic acid (FA) and caffeic acid (CA)) has been performed by measuring time-evolutions of 1 O 2 phosphorescence at 1274nm in ethanol, in an ethanol/acetone mixed solvent and in an ethanol/H 2 O mixed solvent under acidic, neutral and basic conditions. In organic solvents,...
Kinetic studies on the photocatalytic degradation of trichloroethylene (TCE) were performed in TiO 2 or WO 3 aqueous sol which consisted of anatase nanocrystalline TiO 2 of ca. 3.9nm or WO 3 spherical particles of ca. 17.6nm. Photocatalytic activity of TiO 2 colloid is higher than that of WO 3 by a factor of 2.1. Kinetic analyses for both sols give a...
Complex formation between fullerenes and poly(para-phenylene ethynylene) (PPE) is studied through fluorescence quenching of PPE by C 60 . The influence of side chain chemistry, particularly with respect to electron donating capability, and molecular weight on the complex strength is examined in detail. Fluorescence quenching measurements indicate complex formation on the order of 10 3...
As a model for photodynamic therapy, photosensitization with dodecyloxo(methoxo)tetraphenylporphyrinatoantimony bromide was investigated in a phospholipid liposome (LP) constructed with 1,2-diparmitoyl-sn-glycerol 3-phosphocholine. The adsorption isotherms of the sensitizer into the LP showed Langmuir-type adsorption with binding constants in the order of 10 6 M −1 . The sensitizer...
This study was focused on photodegradation of acetaminophen (AA) exposed to ultraviolet (UV) irradiation at 254nm delivered by a system similar to that used for sterilization in sewage treatment plants. The degradation of AA during irradiation for up to 96h was monitored by means of high-performance liquid chromatography (HPLC). Based on the mass/charge ratio (m/z) of the protonated ion and the mass...
Based on the unique properties, quantum dots (QDs) have been widely applied in biological and biomedical fields. However, relatively little is known about the interaction of QDs with some important biomolecules. In this study, the interactions between different charge-capped CdSe/ZnS QDs and bovine serum albumin (BSA) were systematically investigated by UV–vis absorption, fluorescence and circular...
8-Vinyladenosine (8VA) is an adenine analog that effectively base pairs with thymine in duplex DNA. With a red-shifted absorption band centered around 290nm excited 8VA emits Stokes-shifted fluorescence centered at 370nm. The fluorescence quantum yield of 8VA* is sensitive to base stacking, making it an effective reporter of DNA structure and dynamics. We have performed cyclic voltammetry (CV) studies...
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