Abstract
Every year tons of onion waste is produced worldwide. The dried outer onion skin contributed up to 70% of this waste. Outer-dried skins of fifteen prominent onion cultivars from India were selected for the study. A comparative study was done for proximate profiling, thermal characteristics, functional grouping, and mineral contents. Skin of cv. “NHRDF Red” contained the highest amount of crude protein (5.97 ± 0.15 g/100 g), ash (12.24 ± 0.59 g/100 g), and fiber (8.28 ± 0.20 g/100 g), whereas cv. “Pusa Red” possessed the highest amount of total fat (0.47 ± 0.02 g/100 g) and the maximum carbohydrates (76.66 ± 0.56 g/100 g) were found in “Pusa Riddhi.” Mineral analysis showed that cv. “NHRDF Red” had the maximum concentration of all 9 minerals along with sulphur content. Fourier transform infrared spectroscopy analysis explored the various metabolites present in each cultivar. The thermal analysis explored cv. “Agrifound Dark Red” as highly thermally stable having 70.98% residual mass. The lowest Tg temperature range was found between 64.4°C and 90.6°C for “Agrifound Dark Red.” Skin of cv. “NHRDF Red” was reported as the best source of protein, fiber, and minerals, which may be utilized for developing a food product.
Highlights
Onion (Allium cepa L.) is the second most important cultivated horticultural commodity after tomato
“Agrifound Dark Red,” “Agrifound Light Red,” “Bhima Shubhra,” “Hissar-2,” “Phursungi Local,” “Pusa Madhavi,” and “Udaipur Local” but no difference was observed among cv
Pereira et al [20] obtained 9.41 ± 0.09% moisture content in dried onion waste. e differences in the fiber content of skin and cultivar types were the main reasons behind the variation in the moisture content
Summary
Onion (Allium cepa L.) is the second most important cultivated horticultural commodity after tomato. 99,968,016 tons of onion is produced from an area of 5,192,651 hectares [1]. China holds the first position in production with 18,122,435 tons and India is the second producer of onion (11,936,706 tons) in the world [1]. Up to 25% of qualitative and quantitative postharvest losses occurred during storage. Processing of onion has increased which resulted in huge processing waste. E European Union onion processing industry generates more than 500,000 tons of onion waste annually mainly in the UK, e Skin contributes maximum to processing waste. e European Union onion processing industry generates more than 500,000 tons of onion waste annually mainly in the UK, e
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