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Recovery of hesperidin and narirutin from waste Citrus unshiu peel using subcritical water extraction aided by pulsed electric field treatment
Authors:Hee-Jeong Hwang  Hui-Ju Kim  Min-Jung Ko  Myong-Soo Chung
Affiliation:1.Department of Food Science and Biotechnology, Dongguk University, Goyang, 10326 South Korea ;2.Department of Food Science and Engineering, Ewha Womans University, Seoul, 03760 South Korea ;3.Department of Food Science and Biotechnology, Hankyong National University, Anseong, 17579 South Korea
Abstract:The objective of this study was to identify whether the efficacy of extracting hesperidin and narirutin from Citrus unshiu peel by-products can be increased by combining pulsed electric field (PEF) and subcritical water extraction (SWE). The samples were treated with a PEF at a strength of 3 kV/cm for 60 and 120 s. Subsequent SWE was conducted at extraction temperatures of 110–190 °C for 3–15 min. The concentration of hesperidin was highest at 46.96 ± 3.37 mg/g peel (dry basis) after PEF treatment at 120 s, combined with SWE at 150 °C for 15 min, while that of narirutin peaked at 8.76 ± 0.83 mg/g after PEF treatment at 120 s, integrated with SWE at 190 °C for 5 min. The concentrations of both hesperidin and narirutin increased with PEF treatment time. The PEF increased the amounts of hesperidin and narirutin extracted by 22.1% and 33.6%, respectively. This study demonstrate the potential of PEF pretreatment for enhancing the SWE of flavonoids from C. unshiu peel.
Keywords:Citrus unshiu peel  Pulsed electric field (PEF)  Subcritical water extraction (SWE)  Hesperidin  Narirutin
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