4.4 Article

Smartphone Application for Total Phenols Content and Antioxidant Determination in Tomato, Strawberry, and Coffee Employing Digital Imaging

期刊

FOOD ANALYTICAL METHODS
卷 14, 期 4, 页码 631-640

出版社

SPRINGER
DOI: 10.1007/s12161-020-01907-z

关键词

Digital image analysis; Food analysis; Total phenols; Antioxidants; PhotoMetrix (R); Method validation

资金

  1. Professional Master's Program in National Network Chemistry (PROFQUI)

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A low-cost and simple method for in situ determination of total phenols and antioxidants in tomato, strawberry, and coffee through digital imaging was developed and validated in this study. The method showed simple manipulation, fast response, and environmental safety, making it a promising tool for future research in this area.
A low-cost, simple method for in situ determination of total phenols and antioxidants in tomato, strawberry, and coffee through digital imaging was developed and validated. The determination of total phenolic was based on the chelation reaction between quercetin and ferric chloride forming a yellow complex. The antioxidants were quantified by the reaction between 2,6-di-tert-butyl-4-methylphenol, potassium ferricyanide, and ferric chloride, forming a bluish-green complex. After optimization, analytical curves were built to monitor the green color channel within the concentration range of 0 to 31.8 mg L-1 (r = 0.9969) and of 0 to 5 mg L-1 (r = 0.9995) for quercetin and 2,6-di-tert-butyl-4-methylphenol, respectively. The recovery of quercetin and 2,6-di-tert-butyl-4-methylphenol ranged from 96.48 to 101.11% and from 99.00 to 106.00%, respectively. Limits of detection and quantification were 0.03 and 0.11 for quercetin and 0.26 and 0.88 mg L-1 for 2,6-di-tert-butyl-4-methylphenol. The proposed method affords simple manipulation, fast response and environmental safety.

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