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Setyaningsih W, Saputro IE, Carrera CA, Palma M, García-Barroso C. Fast Determination of Phenolic Compounds in Rice Grains by Ultraperformance Liquid Chromatography Coupled to Photodiode Array Detection: Method Development and Validation. J Agric Food Chem 2019; 67:3018-3027. [PMID: 30761903 DOI: 10.1021/acs.jafc.8b05430] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
There are several phenolic compounds in rice grains providing benefits for human health. The concentration of phenolic compounds in rice is strongly affected by the polishing steps during rice production. A new sensitive ultraperformance liquid chromatography-ultraviolet-visible spectroscopy method with a photodiode array detection protocol has been developed and validated for the quantitation of phenolic compounds in rice grains. Several working variables and two different columns were evaluated. Finally, a less than 3 min analysis time was developed to achieve enough resolution for the simultaneous determination of the 20 most common phenolic compounds in rice. The analytical properties for the separation method produced an adequate sensitivity for all phenolic compounds in the regular range for phenolics in rice, 0.5-100 mg L-1 ( R2 > 0.997), with high precisions for both repeatability and intermediate precisions (coefficients of variation less than 0.4 and 2.5% for the retention time and area of the peaks, respectively).
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Affiliation(s)
- W Setyaningsih
- Department of Food and Agricultural Product Technology, Faculty of Agricultural Technology , Universitas Gadjah Mada , Jalan Flora , Bulaksumur, Yogyakarta 55281 , Indonesia
| | - I E Saputro
- Department of Analytical Chemistry, Faculty of Sciences, IVAGRO , University of Cádiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro , 11510 Puerto Real , Cádiz , Spain
| | - C A Carrera
- Department of Analytical Chemistry, Faculty of Sciences, IVAGRO , University of Cádiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro , 11510 Puerto Real , Cádiz , Spain
| | - M Palma
- Department of Analytical Chemistry, Faculty of Sciences, IVAGRO , University of Cádiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro , 11510 Puerto Real , Cádiz , Spain
| | - C García-Barroso
- Department of Analytical Chemistry, Faculty of Sciences, IVAGRO , University of Cádiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro , 11510 Puerto Real , Cádiz , Spain
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Setyaningsih W, Saputro IE, Barbero GF, Palma M, García Barroso C. Determination of Melatonin in Rice (Oryza sativa) Grains by Pressurized Liquid Extraction. J Agric Food Chem 2015; 63:1107-1115. [PMID: 25572452 DOI: 10.1021/jf505106m] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Melatonin provides a number of benefits for human health. The study reported here concerns the optimization, validation, and application of analytical pressurized liquid extraction and high-performance liquid chromatography coupled to a fluorescence detector for the determination of melatonin in rice grains. The factors that are most likely to affect the extraction efficiency were optimized with a 2IV7-2 fractional factorial design. The optimum extraction conditions were achieved by applying 70% EtOAc in MeOH at 200 °C and 200 atm for a static time of 5 min in two cycles with 50% flushing and a 60 s purge to extract a 2.5 g rice sample. The method validation ensured excellent linearity, limit of detection, limit of quantification, precision, and recovery. Furthermore, the method was applied to various rice products composed of polished, whole grain, aromatic, black, black glutinous, red, and parboiled rice. All kinds of pigmented rice grains showed high levels of melatonin (>100 μg kg -1), and the highest levels were found in red rice.
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Affiliation(s)
- Widiastuti Setyaningsih
- Department of Food and Agricultural Product Technology, Faculty of Agricultural Technology, Gadjah Mada University , Jalan Flora 55281, Yogyakarta, Indonesia
- Department of Analytical Chemistry, Faculty of Sciences, University of Cadiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro, 11510 Puerto Real, Cádiz, Spain
| | - Irfan Estiono Saputro
- Department of Analytical Chemistry, Faculty of Sciences, University of Cadiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro, 11510 Puerto Real, Cádiz, Spain
| | - Gerardo Fernández Barbero
- Department of Analytical Chemistry, Faculty of Sciences, University of Cadiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro, 11510 Puerto Real, Cádiz, Spain
| | - Miguel Palma
- Department of Analytical Chemistry, Faculty of Sciences, University of Cadiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro, 11510 Puerto Real, Cádiz, Spain
| | - Carmelo García Barroso
- Department of Analytical Chemistry, Faculty of Sciences, University of Cadiz , Campus de Excelencia Internacional Agroalimentario (CeiA3), Campus del Rio San Pedro, 11510 Puerto Real, Cádiz, Spain
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