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Ngamwonglumlert L, Devahastin S. Brazilein as an alternative pigment: Isolation, characterization, stability enhancement and food applications. Food Chem 2023; 398:133898. [DOI: 10.1016/j.foodchem.2022.133898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 08/01/2022] [Accepted: 08/06/2022] [Indexed: 11/15/2022]
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Ngamwonglumlert L, Devahastin S, Chiewchan N, Raghavan GSV. Color and molecular structure alterations of brazilein extracted from Caesalpinia sappan L. under different pH and heating conditions. Sci Rep 2020; 10:12386. [PMID: 32709964 PMCID: PMC7382456 DOI: 10.1038/s41598-020-69189-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 07/06/2020] [Indexed: 12/12/2022] Open
Abstract
Brazilein extract from sappan wood (Caesalpinia sappan L.) has potential for use as natural food colorant since it has no unique flavor and taste. Although brazilein has long been applied in several traditional foods and beverages, information on its stability, which is of importance for practical application, is still limited. In this work, brazilein was isolated from sappan wood; its purity was confirmed by nuclear magnetic resonance spectroscopy. Relations between molecular structures and color as well as thermal stabilities of brazilein in aqueous solutions at pH 3, 7 and 9 were for the first time investigated. At the lowest pH, zero net-charge structure of brazilein, which exhibited yellow color, was predominantly found. The deprotonated and fully deprotonated structures of brazilein, which exhibited orange and red colors, respectively, were found when pH of the aqueous solutions increased. The forms of brazilein existing at the higher pH suffered extensive degradation upon heating, while the form existing at the lowest pH possessed higher stability. Heat-induced deprotonation and degradation were confirmed by UV-visible and Fourier-transform infrared spectra as well as losses of brazilein content.
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Affiliation(s)
- Luxsika Ngamwonglumlert
- Advanced Food Processing Research Laboratory, Department of Food Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha u-tid Road, Tungkru, Bangkok, 10140, Thailand
| | - Sakamon Devahastin
- Advanced Food Processing Research Laboratory, Department of Food Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha u-tid Road, Tungkru, Bangkok, 10140, Thailand. .,The Academy of Science, The Royal Society of Thailand, Dusit, Bangkok, 10300, Thailand.
| | - Naphaporn Chiewchan
- Advanced Food Processing Research Laboratory, Department of Food Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha u-tid Road, Tungkru, Bangkok, 10140, Thailand
| | - G S Vijaya Raghavan
- Department of Bioresource Engineering, Faculty of Agricultural and Environmental Sciences, McGill University, 21111 Lakeshore Road, Ste. Anne de Bellevue, Quebec, H9X 3V9, Canada
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