Optimization of supercritical CO2 extraction process for oleoresin from rotten onion waste

•The aim of the research is converting the agricultural waste/by-products to value-added products.•The maximum oleoresin yield of 1.012% can be achieved at 80°C temperature, 400bar pressure, 0.53mm particle size and 60min dynamic time.•At the above processing conditions, Sulphur and pyruvate content...

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