A smartphone algorithm with inter-phone repeatability for the analysis of colorimetric tests

Yetisen, Ali K.; Martínez-Hurtado, Juan Leonardo; Garcia-Melendrez, Angel; Vasconcellos, Fernando da Cruz; Lowe, Christopher R.

doi:10.1016/j.snb.2014.01.077

Cited by 253 publications

(175 citation statements)

References 21 publications

Supporting

Mentioning

170

Contrasting

Unclassified

Order By: Relevance

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15] Ozcan and co-workers and Henry and co-workers have recently reviewed the literature in the field. [17][18][19] Test strips, however, typically only provide semi-quantitative results; for full quantitation, test kits for liquid samples remain the gold standard.…”

Section: Introductionmentioning

confidence: 99%

Broadly Available Imaging Devices Enable High-Quality Low-Cost Photometry

et al. 2015

View full text Add to dashboard Cite

This paper demonstrates that, for applications in resource-limited environments, expensive microplate spectrophotometers-which are used in many central laboratories for parallel measurement of absorbance of samples-can be replaced by photometers based on inexpensive and ubiquitous, consumer electronic devices (e.g., scanners and cell-phone cameras). Two devices-i) a flatbed scanner operating in transmittance mode and ii) a camera-based photometer constructed from a cell phone camera, a planar light source, and a cardboard box-demonstrate the concept. These devices illuminate samples in microtiter plates from one side, and use the RGB-based imaging sensors of the scanner/camera to measure the light transmitted to the other side. The broadband absorbance of samples (RGB-resolved absorbance) can be calculated using the RGB color values of only three pixels per micro-well. Rigorous theoretical analysis establishes a well-defined relationship between the absorbance spectrum of a sample and its corresponding RGB-resolved absorbance. The linearity and precision of measurements performed with these low-cost photometers on different dyes that absorb across the range of the visible spectrum, and chromogenic products of assays (e.g., enzymatic, ELISA) demonstrates that these low-cost photometers can be used reliably in a broad range of chemical and biochemical analyses. The ability to perform accurate measurements of absorbance on liquid samples, in parallel and at low cost, would enable testing, typically reserved for well-equipped clinics and laboratories, to be performed in circumstances where resources and expertise are limited.

show abstract

Section: Introductionmentioning

confidence: 99%

Broadly Available Imaging Devices Enable High-Quality Low-Cost Photometry

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Cellulose also allows for reagents to be immobilized on the surface creating a "reagentless" sensing platform. 63 The benefits of paper as an optical sensing platform and examples of nanopaper configurations have been reviewed by Merkoci et al 64 Lateral flow devices that involve migration of reagents and analyte samples through specifically designed channels have been largely used in applications in the clinical field. Figure 6 shows an example of fabrication and operation procedure of a lateral flow device obtained by creating wax barriers on paper.…”

Section: ·1 Optical and Fluorescence Based Detectionmentioning

confidence: 99%

Nanomaterial-functionalized Cellulose: Design, Characterization and Analytical Applications

2018

View full text Add to dashboard Cite

“…Different sensing arrays are developed, like pH indicator blended hydrogel matrix (Devadhasan and Kim 2015), microfluidic paper (Lopez-Ruiz et al 2014) or even graphene-based arrays (Vashist et al 2015a). Next to food industrial applications, devices for mobile health market are also available (Vashist et al 2015b), for example detecting biomarkers in sweat and saliva (Oncescu et al 2013) or perform urine tests (Yetisen et al 2014). …”

Section: Smartphone As An Analytical Device and The Importance Of Ph mentioning

confidence: 99%

Smartphone-Based Extension of the Curcumin/Cellophane pH Sensing Method

2015

View full text Add to dashboard Cite

qualitative, quick and low-cost method for pH determination is developed, which provide more sensitive detection, as the bare eye checking. Next to cellophane substrate, curcumin/gelatine sensor arrays are studied, too. Food-industrial and health-care products are targeted with a modular system based on the curcumin-coloured cellophane/gelatine sensor array, a free android application running on a smartphone, together with home-written data analyser software. In situ monitoring and local pH mapping in liquid cell, investigation with curcumin dotted cellophane array and long-time stable, dried curcumin-coloured gelatine capsules are discussed.

show abstract

A smartphone algorithm with inter-phone repeatability for the analysis of colorimetric tests

Cited by 253 publications

References 21 publications

Broadly Available Imaging Devices Enable High-Quality Low-Cost Photometry

Broadly Available Imaging Devices Enable High-Quality Low-Cost Photometry

Nanomaterial-functionalized Cellulose: Design, Characterization and Analytical Applications

Smartphone-Based Extension of the Curcumin/Cellophane pH Sensing Method

Contact Info

Product

Resources

About