Molecular excitons of Pyronin B and Pyronin Y in colloidal silica suspension

Arık, Mustafa; Onganer, Yavuz

doi:10.1016/s0009-2614(03)00848-0

Cited by 52 publications

(54 citation statements)

References 26 publications

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“…, HIn + and In) selected as ion-pairing reagent in detection of oxalate by spectrophotometry, is a fluorescence sensitive xanthene derivative dye with pKa values of 6.9 and 10.1, which is planar and cationic in nature [31]. Also, it is a highly aggregating dye in microheterogenous media at lower pHs than 7.0, so as to give H-and J-types aggregates.…”

Section: Generalaspects Related To Methods Developmentmentioning

confidence: 99%

“…Also, it is a highly aggregating dye in microheterogenous media at lower pHs than 7.0, so as to give H-and J-types aggregates. Depending on dye concentration, polarity and medium acidity, it has been observed that the dye at 3.0x10 -6 mol L -1 can be able to aggregate with a KD value of 4.71x10 5 at 20 o C, in which monomerdimer equilibrium is observed with a blue shift of 16 nm [31]. Due to these properties of the dye, it is clear that the ion-pairing reagent, which is predominantly H 2 In 2+ or HIn + in environment, tends to give a stable hydrophobic complex with anionic VO 2 (Ox) 2 3-complex, produced in the presence of V(V) at pH 5.0, so that it will form ionassociation complex.…”

Section: Generalaspects Related To Methods Developmentmentioning

confidence: 99%

See 1 more Smart Citation

A New Ultrasonic Assisted Cloud Point Extraction and Preconcentration Procedure for the Spectrophotometric Oxalate Determination in Beverages

Altunay¹,

Gürkan²

2017

HJBC

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Ö ZS pektroforomere aracılığıyla okzalatın belirlenmesi öncesi onun önderiştirilmesi için yeni ultrasonik destekli bulutlanma noktası özütleme yöntemi geliştirildi. Optimum koşullarda, kalibrasyon eğrisinin 0.4-170 µg L − 1 çalışma aralığında yüksek doğrusalığa sahip olduğu görüldü. Seçme ve tayin sınırları sırasıyla 0.12 ve 0.40 µg L − 1 olarak bulundu. Yüzde bağıl standart sapma olarak kesinlik, %BSS (n: 5; 10, 15, 30 µg L − 1 ), %3.5 den daha düşük gözlendi. Ultrasonik koşullar altında, yöntem iki farklı asidik özütleme yaklaşımı kullanarak içecek örneklerindeki çözünür ve toplam okzalatın belirlenmesi için başarılı bir şekilde uygulandı. Son olarak, yöntemin geçerliliği elde edilen sonuçların referans yöntem ile karşılaştırılması ile doğrulandı. Anahtar KelimelerPyronin B, bulutlanma noktası, Ultrasonik destekli özütleme. A B S T R A C TA new ultrasonic-assisted cloud point extraction procedure (UA-CPE) was developed for preconcentration of oxalate in beverages prior to determination via spectrophotometry. At optimal conditions, the calibration curve was highly linear in a working range of 0.4-170 µg L − 1 . The limits of detection and quantification were 0.12 and 0.40 µg L − 1 . the precision as the percentage relative standard deviation, RSD% (n: 5; 10, 15, 30 µg L − 1 ) was lower than 3.5%. The method was successfully applied to the determination of soluble and total oxalate in beverage samples using two different acidic extraction approaches under ultrasonic power. Finally, the method was validated by comparing the results obtained with those of the reference method.

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Section: Generalaspects Related To Methods Developmentmentioning

confidence: 99%

Section: Generalaspects Related To Methods Developmentmentioning

confidence: 99%

A New Ultrasonic Assisted Cloud Point Extraction and Preconcentration Procedure for the Spectrophotometric Oxalate Determination in Beverages

Altunay¹,

Gürkan²

2017

HJBC

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“…M PyB (curve a) [60]. After the polymerization process on electrode surface the intensity of monomer band decreases, …”

Section: à3mentioning

confidence: 98%

“…Most of the dyes are planar and cationic in nature. They exhibit blue shift on dimerization [59,60]. The monomer absorption spectra of PyB and poly(PyB) coated electrode is given in Figures 4a and b, respectively.…”

Section: Surface Characterizations By Sem Afm Eis and Uv-vismentioning

confidence: 99%

Amperometric Sensor for Detection of the Reduced Form of Nicotinamide Adenine Dinucleotide Using a Poly(pyronin B) Film Modified Electrode

Kumar

Chen

2009

Electroanalysis

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An electrochemical method for the preparation of poly(pyronin B) film was proposed in this paper. A poly(pyronin B) (poly(PyB)) film modified glassy carbon electrode (GCE) has been fabricated via an electrochemical oxidation procedure and applied to the electrocatalytic oxidation of reduced form of nicotinamide adenine dinucleotide (NADH). The poly(PyB) film modified electrode surface has been characterized by atomic force microscope (AFM), scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), UV-visible absorption spectrophotometry (UV-vis) and cyclic voltammetry (CV). These studies have been used to investigate the poly(PyB) film, which demonstrates the formation of the polymer film and the excellent electroactivity of poly(PyB) in neutral and even in alkaline media. Due to its potent catalytic effects towards the electrooxidation of NADH at lower potential (0.0 V), poly(PyB) film modified electrode can be used for the selective determination of NADH in real samples because of dopamine, ascorbic acid and uric acid oxidation can be avoided at this potential. The catalytic peak currents are linearly dependent on the concentrations of NADH in the range of 1.0 Â 10 À6 to 5.0 Â 10 À4 mol/L with correlation coefficients of 0.999. The detection limits for NADH is 0.5 Â 10 À6 mol/L. Poly(PyB) modified electrode also shows good stability and reproducibility due to the irreversible attachment of polymer film at GCE surface.

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“…18,19 Celebi et al have studied the fluorescence quenching of PY by molecular oxygen in aqueous solution. 18 In the present study, we found that PY itself has a strong resonance fluorescence in sulfuric acid medium.…”

Section: Introductionmentioning

confidence: 99%

A Catalytic Resonance Fluorometry Method for Determination of Hydroquinone and Its Applications

Tan

Liu

et al. 2009

ANAL. SCI.

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Pyronin Y (PY) has a strong resonance fluorescence in sulfuric acid medium. The characteristics of the resonance fluorescence spectra and the factors affecting the spectra were studied. A catalytic resonance fluorometry method for the determination of hydroquinone was proposed based on the catalytic effect of hydroquinone on the oxidation of PY by potassium bromate. The oxidation of PY resulted in the decrease of the resonance fluorescence intensity. The influences of several variables on the sensitivity were studied. At the optimized conditions, the decrease of the resonance fluorescence intensity was in proportion to the concentration of hydroquinone in the range of 4.42 -1.60 ¥ 10 3 mg l -1 , and the detection limit was 1.46 mg l -1 . The proposed method was applied successfully for the determination of trace hydroquinone in environment samples. The relative standard deviation was less than 3.90% and the recoveries were in the range of 95.2 -104.0%.

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Molecular excitons of Pyronin B and Pyronin Y in colloidal silica suspension

Cited by 52 publications

References 26 publications

A New Ultrasonic Assisted Cloud Point Extraction and Preconcentration Procedure for the Spectrophotometric Oxalate Determination in Beverages

A New Ultrasonic Assisted Cloud Point Extraction and Preconcentration Procedure for the Spectrophotometric Oxalate Determination in Beverages

Amperometric Sensor for Detection of the Reduced Form of Nicotinamide Adenine Dinucleotide Using a Poly(pyronin B) Film Modified Electrode

A Catalytic Resonance Fluorometry Method for Determination of Hydroquinone and Its Applications

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