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Spectrophotometer with enhanced sensitivity for uric acid detection

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Abstract

A spectrophotometer with an LED as the light source for uric acid detection is proposed in this work. The mechanism of uric acid detection is based on energy absorbed by sodium urate, which is a chemical product of uric acid and sodium hydroxide solution. For the performance validation, comparison between the spectrophotometer with an LED and halogen lamp is carried out. Measurement results suggest that the spectrophotometer system with LED light has better sensitivity than that with halogen light. At a 460 nm wavelength, the sensitivity for the spectrophotometer with an LED is 0.0046 dL/mg, which is 73% higher than that with halogen light that records 0.0012 dL/mg. This enhanced sensitivity is attributed to the higher luminous efficacy of the LED light beam. As a result, a larger amount of flux interacts with the sample, leading to the sensitivity enhancement. The spectrophotometer with an LED is also applied for the detection of uric acid in a real human urine sample. Based on the experimental data at a 460 nm wavelength, the method manages to achieve the sensitivity of 0.0016 dL/mg, accuracy of 96.01%, limit of detection of 4.79 mg/dL, and limit of quantification of 14.52 mg/dL. These findings show that the use of LED as the input light source is promising for the spectrophotometer.

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DOI:10.3788/COL201917.081701

所属栏目:Medical optics and biotechnology

基金项目:The authors thank Universiti Tun Hussein Onn Malaysia (UTHM) for supporting this research work under the Tier 1 University Grant Scheme (No. H162).

收稿日期:2019-01-07

录用日期:2019-05-06

网络出版日期:2019-07-26

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Nurfatihah Che Abd Rashid:Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Nor Hafizah Ngajikin:Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Bt. Pahat, Johor, Malaysia
Asrul Izam Azmi:Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Rashidah Arsat:Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Suhaila Isaak:Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Noran Azizan Cholan:Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Bt. Pahat, Johor, Malaysia
Nur Ellina Azmi:Industrial Biotechnology Research Centre, SIRIM Berhad, 40200 Shah Alam, Selangor, Malaysia

联系人作者:Nor Hafizah Ngajikin(norhafizah@uthm.edu.my)

备注:The authors thank Universiti Tun Hussein Onn Malaysia (UTHM) for supporting this research work under the Tier 1 University Grant Scheme (No. H162).

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引用该论文

Nurfatihah Che Abd Rashid, Nor Hafizah Ngajikin, Asrul Izam Azmi, Rashidah Arsat, Suhaila Isaak, Noran Azizan Cholan, Nur Ellina Azmi, "Spectrophotometer with enhanced sensitivity for uric acid detection," Chinese Optics Letters 17(8), 081701 (2019)

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