Issue 43, 2022

Smartphone-based digital image colorimetry for determination of iron in cereals and crispy seaweed using Terminalia chebula retz. extract as a natural reagent

Abstract

In this research, a novel sample pretreatment of whole wheat bread, granola, and crispy seaweed samples was developed for iron(III) determination by digital image colorimetry. The developed method was compared with UV-visible spectrophotometry. The procedure involved weighing the sample (∼0.1 g) and mixing it with a mixture of concentrated nitric acid (65%) and hydrogen peroxide (30%) (2 : 1 v/v). Then, the mixture was irradiated with UV light until it became dry. The residue was then dissolved in deionized water. The sample solution was diluted with deionized water before forming a complex with Terminalia chebula Retz. extract in acetate buffer. Under the optimal conditions, the color of the complexes was violet. When analyzed with an inhouse developed smartphone-based digital image colorimeter, the linear range was 1.0–6.0 mg L−1 with a correlation coefficient of >0.993. The percentage recoveries were in the range of 84.8–90.2. The limit of detection (LOD) and the limit of quantification (LOQ) were 1.06 and 3.55 mg L−1, respectively. From the results, it can be concluded that the developed method is accurate, simple, cost-effective, and environmentally friendly. The statistical paired t-test proved that there was no significant difference in the results when compared with a UV-visible microplate reader using gallic acid as the color forming reagent and a flame atomic absorption spectrophotometer as a reference instrument at 95% confidence level.

Graphical abstract: Smartphone-based digital image colorimetry for determination of iron in cereals and crispy seaweed using Terminalia chebula retz. extract as a natural reagent

Supplementary files

Article information

Article type
Paper
Submitted
19 Mha 2022
Accepted
08 Nhl 2022
First published
10 Nhl 2022

Anal. Methods, 2022,14, 4321-4329

Smartphone-based digital image colorimetry for determination of iron in cereals and crispy seaweed using Terminalia chebula retz. extract as a natural reagent

P. Masawat, T. Yenkom, C. Sitsirat and T. Thongmee, Anal. Methods, 2022, 14, 4321 DOI: 10.1039/D2AY01345B

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