Journal
FOOD CHEMISTRY
Volume 386, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2022.132737
Keywords
Extraction; Food formulation; Nutraceutical; Quercetin; Techno-functional properties
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Onion waste is a major environmental concern, but red onion skin contains bioactive compounds that can be extracted and used to produce value-added products. This study summarizes various methods for extracting compounds from red onion waste and investigates the potential industrial applications of natural bioactives derived from red onion skin in food systems.
Onion is an important vegetable in the world and the second most important vegetable crop after tomato. Hence, the onion waste, such as onion skin, is produced in abundance causing environmental problems. Due to its bioactive compounds, especially phenolics and flavonoids, red onion skin can be used through appropriate methods for producing value-added products. These phytochemicals are proven to prevent oxidative stress and broad spectrum of microorganisms beside having diverse beneficial biological properties. Extraction step is the most critical processing in making phytonutrient available. Various approaches including conventional and non-conventional technologies applied for extracting different compounds from red onion wastes was summarized in this study. To evaluate the industrial application potential, the use of natural bioactives derived from red onion skin for elaboration of various food systems has been also investigated.
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