Abstract
Abstract A supercritical fluid extraction (SC-CO2) was used to extract high-quality oil from tomato skin by-products. The effects of pressure and extraction time on oil yield was investigated in the study. Lycopene and β-carotene content as well as p-coumaric acid, ferulic acid, caffeic acid, chlorogenic acid, vanillic acid, epicatechin, naringenin, catechin, quercetin and luteolin were estimated. The highest oil yield of 79.00% was obtained after 80 min with a pressure of 550 bar. The resulting oleoresin in carotenoids with lycopene and β-carotene content respectively of 0.86 and 1.5 mg/100 g, this oleoresin was found to be the richest. Naringenin was the most abundant flavonoid identified with a maximum content in oleoresin extracted at 550 bar (84.04 mg/kg DW) followed by caffeic acid (26.60 mg/kg DW). A moderate radical scavenging potential was further observed. Overall, results highlight that pressure is a key parameter for the extraction bioactive oleoresin from tomato skin by-products.
Highlights
Non-negligible amounts of various kinds of waste are generated in the vegetable processing industry
Several research studies have pointed out that tomato peels contain a high level of bioactive compounds including phenols, lycopene, ascorbic acid compared to their pulp and seeds (Vinha et al, 2014)
These results demonstrate that the removal of peels and seeds during cooking or industrial processing leads to a significant loss of all the major antioxidants (Toor & Savage, 2005)
Summary
Non-negligible amounts of various kinds of waste are generated in the vegetable processing industry. Lycopene is subjected to a long and expensive purification process that does not lead, to a high degree of purity To overcome these drawbacks, new solvent‐free and environmental friendly compatible extractions support the use of supercritical fluids such as carbon dioxide (CO2) in order to obtain toxic-free solvent products (Amaral et al, 2018a, b). New solvent‐free and environmental friendly compatible extractions support the use of supercritical fluids such as carbon dioxide (CO2) in order to obtain toxic-free solvent products (Amaral et al, 2018a, b) This technology is configured as an interesting alternative for the food industry due to the increased nutrient retention (Amaral et al, 2017)
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