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dc.contributor.authorPirom Didpinrumen_US
dc.contributor.authorWatsaka Siriangkhawuten_US
dc.contributor.authorKraingkrai Ponhongen_US
dc.contributor.authorPiyanete Chantiratikulen_US
dc.contributor.authorKate Grudpanen_US
dc.description.abstractA low-cost and reliable analytical method based on the combination of a newly designed sticker-plastic sheet platform, digital image-based colorimetry and down scaled Kjeldahl digestion is proposed for the determination of protein content in food samples. The yellowish-brown colloidal products, obtained from the reaction between the ammonium-nitrogen after digestion and the working Nessler's reagent on the miniaturized sticker-plastic sheet platform, were captured for imaging with a smartphone camera. The operational parameters and reaction conditions were optimized. A down scaled Kjeldahl digestion procedure was performed using the newly designed digestion block. The parameters influencing the digestion efficiency, including the mass of the sample, volume of acid, mass of the catalyst and digestion time, were evaluated. Under the selected conditions, a linear calibration in the range of 5-60 mg L-1 ammonium-nitrogen was obtained with limits of detection and quantification of 2.8 and 7.6 mg L-1, respectively. The repeatability and reproducibility were 6.7% and 8.8%, respectively. The accuracy of the proposed method was evaluated by applying the developed procedure for milk powder and feeding stuff reference materials and comparing it with the conventional Kjeldahl method. The proposed method was successfully applied for the determination of protein contents in soy foods and protein-based foods. The results agreed well with those obtained from the conventional Kjeldahl method.en_US
dc.subjectChemical Engineeringen_US
dc.titleA newly designed sticker-plastic sheet platform and smartphone-based digital imaging for protein assay in food samples with downscaling Kjeldahl digestionen_US
article.title.sourcetitleRSC Advancesen_US
article.volume11en_US Universityen_US Mai Universityen_US
Appears in Collections:CMUL: Journal Articles

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