Rhodamine B and

Pigment Violet 1 [13264)3-0] 45170 2 triarylcarbonium PTMA salt salt formation between Rhodamine B and phosphotungstomolybdic acid... 

Karstens, T. and Kobs, K. (1980). Rhodamine-B and rhodamine-101 as reference substances for fluorescence quantum yield measurements. J. Phys. Chem. 84, 1871-1872. 

As compounds exhibiting enhancing effects on CL reactions, a variety of phenols, e.g., firefly luciferin and 6-hydroxybenzothiazole derivatives [12,13], 4-iodophe-nol [14], 4-(4-hydroxyphenyl)thiazole [15], 2-(4,-hydroxy-3 -methoxy-benzyli-dene)-4-cyclopentene-l,3-dione (KIH-201) [16], and 2-(4-hydroxyphenyl)-4,5-diphenylimidazole (HDI) and 2-(4-hydroxyphenyl)-4,5-di(2-pyridyl)imidazole (HPI)[17] (Fig. 6A), and phenylboronic acid derivatives, e.g., 4-phenylylboronic acid [18], 4-iodophenylboronic acid [19], and4-[4,5-di(2-pyridyl)-l //-imidazol-2-yl]phenylboronic acid (DPPA) [20] (Fig. 6B), in the luminol/hydrogen peroxide/peroxidase system are well known. Rhodamine B and quinine are used as sensitizers in the CL-emitting reaction between cerium (IV) and thiol compounds. This CL reaction was successfully applied to the sensitive determination of various thiol drugs [21-32],... 

Fig. 19.13 (a) FRET between 0.2 mM Rhodamine B and 0.8 mM LD800. (b) Lasing of 2 mM LDS722 through cascade FRET from Coumarin 480 (0.2 mM) and R6G (0.4 mM). (c) Lasing of 0.125 mM Nile blue in methanol through FRET from 200 nM CdSe/ZnS core/shell QDs. The pump laser is at 485 nm. Reprinted from Ref. 18 with permission. 2008 Optical Society of... 

Fig. 3.172. Non-aqueous capillary electrophoresis with electrochemical detection of a dye mixture containing (a) 1.7 jUg/ml malachite green, (b) 0.70 jug/ml crystal violet, (c) 4.3 /ig/ml rhodamine B, and (d) 9.1 X 10-6 M ferrocene. Experimental conditions capillary dimensions, 95 cm X 75 pm i.d. running electrolyte, acetonitrile containing 1 M HAc and 10 mM NaAc electrokinetic injection, 20 s 5 kV separation voltage 20 kV applied detection potential, 1.55 V. Reprinted with permission from F.-M. Matysik [206].

In the four components, i.e., TiOj/MV /electron donor/bacterial cells, each of the last three components has its own specific function and each facilitates the other s role, thereby enhancing the yield of hydrogen production. It was found that with sensitized TiO, there is a higher amount of hydrogen production than with the naked TiO. Among the sensitizers used, Rhodamine B and Ru(bpy)3 " exhibited higher efficiencies compared with other sensitizers, as well as other methods of sensitization (2 and 3) (Gumnathan, 2000). 

The fluorescence polarization spectrum of Rhodamin B and the SoFresponding absorption spectrum are given in the Figure 4.17B. The transition in bands 1 and 5 have the same polarization direction, bands 3 pud 4 are polarized almost perpendicular to 1 and the polarization of 2 gjt at some intermediate angle. These reflect the relative orientation of phe transition moments in the respective bands. 

Ujiie et al. [204] fabricated quartz chips for NCE and reported the separation of rhodamine B and sulforhodamine at 14.4 and 66.6 cm separator lengths. The buffer was 20 mM phosphate buffer at 2kV applied voltage and the separation was achieved in 70 seconds. Wakida et al. [205] reported a high throughput characterization for dissolved organic carbon in environmental waters within 2 minutes using NCE. The authors collected water samples from 10 sampling points at the Hino River that flows into Lake Biwa. Shin et al. [206] described NCE (PDMS) with fluorescence detection for analyses of atrazine. 

Synthesis of Xanthene Dyes. Phtbalic anhydride reacts with 3-dietbylaminophe-nol in the molten state to give rhodamine B, and with resorcinol to give fluorescein. For unsymmetrical xanthene dyes, dihydroxybenzoyl- (24) or an aminohy-droxybenzoylbenzoic acid (25) is required. 

Successful liquid-phase separation on-chip was first carried out in CE, because EOF pumping can be easily achieved in the microscale. For instance, six fluorescein-labeled amino acids are separated by CE on a Pyrex glass chip (10-pm-deep and 30-pm-wide channel) (see Figure 6.5). Separation was achieved in a very short time of about 15 s [324]. Similar CE separation of calcein and fluorescein were also reported [582]. Separation of a binary mixture of rhodamine B and dichlorofluorescein was even achieved in only 0.8 ms using a short separation length of 200 pm [604]. 

Contrasting with the aforementioned assessments, the SC can be studied after staining the harvested SACD. Many dyes are available and their choice depends on the goal of the study. As an example, a mixture of rhodamine B and methylene blue conveniently decorates the corneocytes for microscopic examination. Another quantitative assay is based on the Lowry s reaction of proteins with an alkaline copper tartrate solution and Folin reagent followed by spectrophotometric measurement of the reaction product with maximum absorbance at 750 nm 59... 

Takizawa, T. Watanabe, T. Honda, K. Photocatalysis through excitation of adsorbates. 2. A comparative study of rhodamine B and methylene blue on CdS, J. Phys. Chem. 1978, 82, 1391. 

The original insoluble substance may also be subjected to the Na2C03-S fusion, and the extract, after acidifying with 1 1 HC1, filtered. Any precipitate is washed, dissolved in concentrated HC1, and H2S removed by boiling Sb may be detected with Rhodamine-B and Sn with HgCl2 solution. 

In the methods of Sb determination use is made of ion-associates SbCU with Rhodamine B and other basic dyes. The methods are highly sensitive and selective. A simple iodide method is commonly used to determine higher antimony concentrations. 

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