This study aims to evaluate the impact of a nonconventional pretreatment technique "infrareds free solvent" on the intensification of polyphenols extraction from orange peels. Orange peels were pretreated with infrared heating using a ceramic infrared transmitter from 5 to 25 min at 50 °C. After the addition of the solvent on the pretreated peels, ultrasound treatment was applied on the mixture using an ultrasound generator connected to a titanium ultrasound probe, from 5 to 30 min, at 50 °C. Results showed that the application of ultrasounds on untreated peels enhanced the extraction of polyphenols by 62.5% compared to the conventional solid-liquid extraction. Twenty minutes of infrared pretreatment improved the extraction of polyphenols by 47% with solid-liquid extraction, and 112% with ultrasounds after 30 min compared to solid-liquid extraction from untreated peels. Different combinations of infrared pretreatment and ultrasound assisted extraction were then applied on orange peels. The most advantageous combination in terms of energy consumption and polyphenols extraction has been found for a 20 min infrared pretreatment time and 5 min ultrasound assisted extraction of polyphenols. PRACTICAL APPLICATION: Orange peels are valuable sources of natural antioxidants such as polyphenols. Ultrasound-assisted extraction can improve the extraction of polyphenols compared to conventional solid-liquid extraction. To intensify the extraction process, infrared heating can be used as a simple, low cost, and energy saving method. The combined effect of "infrareds free solvent" and ultrasounds allowed the extraction of the highest yields of polyphenols with a high antiradical capacity and a low energy consumption in comparison to conventional extraction.

中文翻译：

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使用红外线作为一种新型节能预处理从橘皮中强化提取多酚

本研究旨在评估非常规预处理技术“无红外线溶剂”对强化橙皮多酚提取的影响。使用陶瓷红外发射器在 50°C 下用红外加热对橙皮进行 5 到 25 分钟的预处理。在预处理的果皮上添加溶剂后，使用连接到钛超声探头的超声发生器在 50°C 下对混合物进行超声处理 5 到 30 分钟。结果表明，与传统的固液萃取相比，超声波在未经处理的果皮上的应用使多酚的萃取率提高了 62.5%。20 分钟的红外预处理使固液萃取的多酚提取率提高了 47%，与未经处理的果皮的固液提取相比，30 分钟后用超声波提取 112%。然后将红外预处理和超声辅助提取的不同组合应用于橙皮。已发现 20 分钟红外预处理时间和 5 分钟超声辅助提取多酚在能耗和多酚提取方面最有利的组合。实际应用：橙皮是天然抗氧化剂（如多酚）的宝贵来源。与传统的固液萃取相比，超声辅助萃取可以提高多酚的萃取效果。为了加强提取过程，红外加热可以作为一种简单、低成本、节能的方法。“无红外线溶剂”的综合效果