期刊
HORTICULTURAE
卷 8, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/horticulturae8121185
关键词
bioactive compounds; antioxidant properties; Barhi dates; Khalal stage; sugars; invertase; edible coating; olive cake; orange peel
类别
资金
- National Plan for Science, Technology and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia
- [2-17-04-001-0031]
In this study, functional coatings developed using chitosan, olive-cake, and orange-peel extracts were applied to preserve Barhi dates. The coatings significantly improved the functional properties and phytochemical content of the dates, and slowed down the ripening process.
Barhi dates at the Khalal stage were preserved using functional coatings developed using chitosan (CH) and olive-cake (OCE) and orange-peel (OPE) extracts in different ratios. The amounts of total flavonoids, total tannins, and total carotenoids, and antioxidant properties were evaluated. The coated and uncoated samples were also quantified for individual bioactive constituents including flavonoids and phenolic acids using liquid chromatography-mass spectrometry (LCMS). Significant (p <= 0.05) improvements in the functional properties and phytochemical content were observed in coated fruits after the application of coatings (OCE+CH and OPE+CH) and during storage at 4 degrees C. The major phytochemicals detected were vanillic, syringic, ferulic, cinnamic, p-coumaric and protocatechuic acids, and quercetin-3-glucoside and rutin. The highest vanillic acid (536.78 mg/kg), syringic acid (157.39 mg/kg) and ferulic acid (96.42 mg/kg) were detected in 2% OPE+CH-coated dates. Application of functional CH coatings containing OCE and OPE was also found effective in preventing the conversion of sucrose to glucose and fructose through slowing down invertase activity. The application of OPE+CH and OCE+CH coatings can be potentially used to enhance the functional properties and slow down the ripening process in Barhi dates at an early stage (Khalal) of maturity.
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