Spectrophotometer with enhanced sensitivity for uric acid detection

Rashid, Nurfatihah Che Abd; Ngajikin, Nor Hafizah; Azmi, Asrul Izam; Arsat, Rashidah; Isaak, Suhaila; Cholan, Noran Azizan; Azmi, Nur Ellina

doi:10.3788/col201917.081701

Cited by 21 publications

(18 citation statements)

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“…Many approaches have been developed for determination of DA and UA in the past decades, including high performance liquid chromatography−mass spectrometry, 6,7 fluorescence, 8,9 spectrophotometry, 10 and so on. However, these methods suffer from complicated, expensive, and time-consuming processes and also require specialized instrumentation.…”

Section: ■ Introductionmentioning

confidence: 99%

Single-Atom Ruthenium Biomimetic Enzyme for Simultaneous Electrochemical Detection of Dopamine and Uric Acid

et al. 2021

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Single-atom catalysts have attracted numerous attention due to the high utilization of metallic atoms, abundant active sites, and highly catalytic activities. Herein, a single-atom ruthenium biomimetic enzyme (Ru-Ala-C3N4) is prepared by dispersing Ru atoms on a carbon nitride support for the simultaneous electrochemical detection of dopamine (DA) and uric acid (UA), which are coexisting important biological molecules involving in many physiological and pathological aspects. The morphology and elemental states of the single-atom Ru catalyst are studied by transmission electron microscopy, energy dispersive X-ray elemental mapping, high-angle annular dark field–scanning transmission electron microscopy, and high-resolution X-ray photoelectron spectroscopy. Results show that Ru atoms atomically disperse throughout the C3N4 support by Ru–N chemical bonds. The electrochemical characterizations indicate that the Ru-Ala-C3N4 biosensor can simultaneously detect the oxidation of DA and UA with a separation of peak potential of 180 mV with high sensitivity and excellent selectivity. The calibration curves for DA and UA range from 0.06 to 490 and 0.5 to 2135 μM with detection limits of 20 and 170 nM, respectively. Moreover, the biosensor was applied to detect DA and UA in real biological serum samples using the standard addition method with satisfactory results.

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Section: ■ Introductionmentioning

confidence: 99%

Single-Atom Ruthenium Biomimetic Enzyme for Simultaneous Electrochemical Detection of Dopamine and Uric Acid

et al. 2021

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“…Because crystal field splitting correlates with 1/R 5 , the smaller Eu 2+ O 2length raises the crystal field's size, yielding a penalty for the 5d line in Eu 2+ . In (2) [21], [22] fits the corresponding brightness decay periods with a second-order exponential decay mode:…”

Section: Characterization Of Phosphormentioning

confidence: 99%

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Huu

That

et al. 2022

IJEECS

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We used solid-condition processes to make a sequence of radiation-adjustable phosphors Eu2+/Mn2+ co-doped Ca9La(PO4)7 (shortened as CaLa:EM), which show a consistently variable hue from green to yellow and red via an efficient resonance-form energy transition as well as the strength of green and red radiations may be controllable through altering the Mn2+concentration. We examined the transition of energy (Eu2+®Mn2+) for CaLa:EM. It is proved to be a resonant kind using a dipole-quadrupole process, having power shift critical range calculated to be 11.36 Å by using the spectral overlap techniques. Mixing a 365 nm UV-InGaN chip as well as one phosphor combination containing (Ca0.98Eu0.005Mn0.015)9La(PO4)7 in yellow with BaMgAl10O17:Eu2+in blue produced a warming WLED having CIE color coordinates measured at (0.35, 0.31), better CRI value (Ra)measured at 91.5 along with smaller CCT value of 4,496 K.

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“…Among the most typical ways to improve this promising source of light, there is one option which is to combine blue light taking from an inverted red phosphor with the LED chip's yellow light. It is indisputable that the configuration of LEDs and the placement of phosphor coatings have a decisive impact on the effectiveness of light production, particularly the color rendering index (CRI) [10][11][12]. As a result, numerous typical phosphor coating technologies for LED manufacture have been developed, like the distributed and the common coating [13,14].…”

Section: Introductionmentioning

confidence: 99%

Double-layer Remote Configuration with LaOF: Eu³⁺ and Sr₃WO₆:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs

Hung

Lee

2022

J. Phys.: Conf. Ser.

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Although the distant phosphor configuration is a good selection for high-luminescence WLEDs, it did not satisfy the high color adequacy standard. With the aim of achieving improved chromatic indices, including the index for color rendering (CRI) and the scale of color quality (CQS), for the distant phosphor structure, a dual-layer design with red or green phosphor addition is suggested in this research report. The color temperature of the WLEDs packets employed in this investigation is 8500 K. The phosphor configuration will be produced by layering green Sr3WO6:U or red LaOF:Eu3+ phosphor on top of the yellow phosphor YAG:Ce3+. The concentration of additional red phosphor LaOF:Eu3+ and green phosphor Sr3WO6:U will then be adjusted to observe the changes in color in luminescence performance of the WLED packages. The theory of Mie about scattering combined with Lambert Beer’s rule supports the investigation on optical results. The findings demonstrated a rise in CRI and CQS along with the existence of LaOF:Eu3+, indicating that the LaOF:Eu3+ presence has a major impact on these two elements. Because of the increased concentration of red light components within WLED packets, CRI and CQS increase with increasing concentration of LaOF:Eu3+. In the meantime, the green phosphor Sr3WO6:U improves the beams of light. However, if the concentrations of both the red LaOF:Eu3+ and the green Sr3WO6:U phosphors are above the corresponding level, the beams of light and color intensity will be reduced. The outcomes of this study are crucial references for producing WLEDs with greater light of white standard.

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Spectrophotometer with enhanced sensitivity for uric acid detection

Cited by 21 publications

References 0 publications

Single-Atom Ruthenium Biomimetic Enzyme for Simultaneous Electrochemical Detection of Dopamine and Uric Acid

Single-Atom Ruthenium Biomimetic Enzyme for Simultaneous Electrochemical Detection of Dopamine and Uric Acid

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Double-layer Remote Configuration with LaOF: Eu³⁺ and Sr₃WO₆:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs

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Spectrophotometer with enhanced sensitivity for uric acid detection

Cited by 21 publications

References 0 publications

Single-Atom Ruthenium Biomimetic Enzyme for Simultaneous Electrochemical Detection of Dopamine and Uric Acid

Single-Atom Ruthenium Biomimetic Enzyme for Simultaneous Electrochemical Detection of Dopamine and Uric Acid

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Double-layer Remote Configuration with LaOF: Eu3+ and Sr3WO6:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs

Contact Info

Product

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About

Double-layer Remote Configuration with LaOF: Eu³⁺ and Sr₃WO₆:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs