New substrate for room-temperature phosphorescence—Inorganic compound plate

Su, Syang Y.; Winefordner, J. D.

doi:10.1016/0026-265x(82)90101-1

Cited by 18 publications

(6 citation statements)

References 9 publications

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“…Such an interaction obviously exists and, in some cases, the phosphorescence spectrum changes with the particular heavy atom used. 9 An analogous difference in the absorption spectra was also observed. The fluorescence spectrum gives a band with a characteristic emission wavelength of 341 nm corresponding to the transition from the first excited singlet state to the ground singlet state.…”

Section: Spectral Characteristicssupporting

confidence: 53%

Direct determination of naftopidil by non-protected fluid room temperature phosphorescence

Pulgarı́n

Molina

Pardo

2001

Analyst

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A selective and sensitive room temperature phosphorimetric method for the direct determination of naftopidil in biological fluids is described. The method is based on obtaining a phosphorescence signal from this antihypertensive drug using TlNO3 as a heavy atom perturber and Na2SO3 as a deoxygenator agent without a protective medium. This technique is named non-protected room temperature phosphorescence (NP-RTP), and enables us to determine analytes in complex matrices without the need for a tedious prior separation process. The optimization of Na2SO3 (8.5 x 10(-3) M) and the accurate value of pH (9.0) were determined using a simplex as a method of optimization. Sodium carbonate-hydrogencarbonate buffer solution (5.0 x 10(-2) M) was used to adjust the suitable pH. The optimum concentration of Tl+ (8.5 x 10(-2) M) was also determined. The delay time, gate time and time between flashes selected were 200 microseconds, 200 microseconds and 5 ms, respectively. Under the above conditions we propose a method to determine naftopidil by direct measurement of phosphorescence intensity with an emission wavelength of 526 nm and an excitation wavelength of 296 nm in the concentration range 0.05-1.00 mg L-1. Under these conditions the phosphorescence signal appears in 3 min once the sample has been prepared. Optimization of the various conditions permitted the establishment of an NP-RTP method for the determination with a detection limit, according to the error propagation theory, of 21.0 ng mL-1. The repeatability was studied using 10 solutions of 0.20 mg L-1 of naftopidil; if error propagation is assumed, the relative error is 1.39%. The standard deviation for replicate samples was 1.1 x 10(-2) mg L-1. This method was successfully applied to the determination of naftopidil, in human urine with recoveries between 106 and 112%.

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Section: Spectral Characteristicssupporting

confidence: 53%

Direct determination of naftopidil by non-protected fluid room temperature phosphorescence

Pulgarı́n

Molina

Pardo

2001

Analyst

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“…Hurtubise and co-workers (6, 7) used sodium acetate to determine the luminescence parameters of p-aminobenzoic acid (FABA). Su and Winefordner (8) used a variety of inorganic substrates to obtain the RTF characteristics of polycyclic aromatic hydrocarbons (PAHs). Femia and Cline Love (9) have reported the use of micelle-stabilized solutions to obtain RTF.…”

Section: Introductionmentioning

confidence: 99%

Analytical characteristics of .beta.-cyclodextrin/salt mixtures in room-temperature solid-surface luminescence analysis

Richmond¹,

Hurtubise²

1989

Anal. Chem.

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“…Inorganic salts, such as CaC03, CaHP04, CaH4(P04)2, Pb(C2H300)2, and H3B03 crystals, were also tested. Some of these salts had been reported to induce RTP in some compounds (7). Unfortunately, these substrates gave no selectivity.…”

Section: Literature Citedmentioning

confidence: 99%

“…Figure 11a shows an electron nuclear double resonance (ENDOR) spectrum (7). The intensity in arbitrary units is plotted as a function of the frequency over a range from 6.4 to 7.4 MHz with a step width of 0.002 MHz.…”

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confidence: 99%