U-Bent Plastic Optical Fiber Sensor for Iron in Iron Supplements

Ashraf, Mohd; Mainuddin, Mainuddin; Beg, Mirza Tariq; Moin, Fiza; Rajesh, R.; Singhal, Gaurav

doi:10.1109/jsen.2022.3187829

Cited by 8 publications

(3 citation statements)

References 58 publications

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“…Ashraf et al (2022) [ 22 ] describes the use of U-Shaped POF s to detect iron, and, in Ashraf et al (2023) [ 23 ], to detect phosphate in water.…”

Section: Introductionmentioning

confidence: 99%

Development of an Immunocapture-Based Polymeric Optical Fiber Sensor for Bacterial Detection in Water

Lopes,

Pinto,

Vargas

et al. 2024

Polymers

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Conventional methods for pathogen detection in water rely on time-consuming enrichment steps followed by biochemical identification strategies, which require assay times ranging from 24 hours to a week. However, in recent years, significant efforts have been made to develop biosensing technologies enabling rapid and close-to-real-time detection of waterborne pathogens. In previous studies, we developed a plastic optical fiber (POF) immunosensor using an optoelectronic configuration consisting of a U-Shape probe connected to an LED and a photodetector. Bacterial detection was evaluated with the immunosensor immersed in a bacterial suspension in water with a known concentration. Here, we report on the sensitivity of a new optoelectronic configuration consisting of two POF U-shaped probes, one as the reference and the other as the immunosensor, for the detection of Escherichia coli. In addition, another methos of detection was tested where the sensors were calibrated in the air, before being immersed in a bacterial suspension and then read in the air. This modification improved sensor sensitivity and resulted in a faster detection time. After the immunocapture, the sensors were DAPI-stained and submitted to confocal microscopy. The histograms obtained confirmed that the responses of the immunosensors were due to the bacteria. This new sensor detected the presence of E. coli at 104 CFU/mL in less than 20 min. Currently, sub-20 min is faster than previous studies using fiber-optic based biosensors. We report on an inexpensive and faster detection technology when compared with conventional methods.

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“…Ashraf et al (2022) [ 22 ] describes the use of U-Shaped POF s to detect iron, and, in Ashraf et al (2023) [ 23 ], to detect phosphate in water.…”

Section: Introductionmentioning

confidence: 99%

Development of an Immunocapture-Based Polymeric Optical Fiber Sensor for Bacterial Detection in Water

Lopes,

Pinto,

Vargas

et al. 2024

Polymers

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“…Many other studies in which POF sensors were used are available, such as the work by Ashraf et al (2022) [22], in which a U-Shape POF was used for the detection of iron supplements, and in another work by Ashraf et al (2023) [23], a U-Shape POF was used for the detection of phosphate in water.…”

Section: Introductionmentioning

confidence: 99%

Development of an Immunocapture-Based Polymeric Optical Fiber Sensor for Bacteria Detection

Lopes,

Pinto,

Vargas

et al. 2024

Preprint

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Conventional methods for pathogen detection in water rely on time-consuming enrichment steps followed by biochemical identification strategies, which require assay times ranging from 24 hours to up to a week. However, in recent years, significant efforts have been made towards the development of biosensing technologies enabling rapid and close-to-real-time detection of waterborne pathogens. In previous studies, we developed a plastic optical fiber (POF) immunosensor using an optoelectronic configuration consisting of a U-Shape probe connected to an LED and a photodetector. Bacterial detection was evaluated with the immunosensor immersed in a bacterial suspension in water with a known concentration. Here, we report on the sensitivity of a new optoelectronic configuration consisting of two POF U-Shape probes, one as the reference and the other as the immunosensor, for the detection of Escherichia coli. In addition, another way of detection was tested where the sensors were calibrated in the air, before immersed in bacterial suspension and then read in the air, making the immunosensor more sensitive and with a faster detection time. This new sensor detected the presence of E. coli at 104 CFU/mL in less than 10 minutes. Currently sub 10 minutes is faster than previous studies using fiber-optic based biosensors. It is also a much simpler and quicker methodology when compared with conventional laboratory technology.

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“…This bending spectral characteristic not only exists in quartz-clad multimode fibers, but also in plastic-clad multimode fibers, with good universality [10,11]. At the same time, the coherent characteristics of the core and cladding light in the bent fiber, the Mach-Zönder interference (MZI) effect for example, provide a critical way to measure small displacements through bent fibers [12][13][14][15][16]. The Ushaped fiber structure is the simplest bending structure with the highest degree of freedom and flexibility.…”

Section: Introductionmentioning

confidence: 99%

Spectral Characteristics and Displacement Sensing of U-Shaped Single-Mode–Multimode–Single-Mode Fiber Structure

Tian,

Chen,

Ren

et al. 2024

Sensors

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The U-shaped fiber configuration represents the elementary form of micro-displacement sensing, characterized by its exceptional freedom and flexibility. The study proposes the U-shaped bent single-mode–multimode–single-mode (SMS) fiber structure that integrates the multimode interference (MMI) effect for enhanced mode dispersion and the Mach–Zönder interference (MZI) effect for spectral sensitivity improvement. The transmission spectral properties of the U-shaped SMS fiber structure with a bent radius over 1 cm are experimentally measured as the change in displacement varied within the range of 5 mm in this work. As the radius decreases, the spectrum shows redshift, which is related to the central wavelength of the peak or dips—a smaller wavelength results in a stronger redshift for the same displacement change. The average sensitivity of micro-displacement measurement within a range of 5 mm is 5.41 pm/μm, and the linearity is 99.62%. The maximum sensitivity of U-shaped SMS fiber structure is 34.46 pm/μm, with the minimum displacement change of approximately 5.804 nm. The transmission spectral properties of the U-shaped SMS fiber structure within the ranges of 50 μm, 500 μm, and 5 mm are experimentally measured in this work. This experiment observed a relatively uniform spectral drift pattern in a large range of micro-displacement sensing. The measurement range is limited by the limited spectral range of the light source and the discontinuous variation in the effective refractive index. This provides an experimental reference for further understanding the characteristics of U-shaped fiber structures and applying its application in micro-displacement sensing.

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U-Bent Plastic Optical Fiber Sensor for Iron in Iron Supplements

Cited by 8 publications

References 58 publications

Development of an Immunocapture-Based Polymeric Optical Fiber Sensor for Bacterial Detection in Water

Development of an Immunocapture-Based Polymeric Optical Fiber Sensor for Bacterial Detection in Water

Development of an Immunocapture-Based Polymeric Optical Fiber Sensor for Bacteria Detection

Spectral Characteristics and Displacement Sensing of U-Shaped Single-Mode–Multimode–Single-Mode Fiber Structure

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