Abstract An efficient solvent-free microwave-assisted distillation followed by homogenate extraction method (SFMD-HE) was established to separate the essential oil, non-volatile flavonols and proanthocyanidins from Cinnamomum japonicum Sieb. leaves. In the SFMD-HE technology applied in this work, no excessive water was introduced into the system, which can reduce the loss of flavonols and proanthocyanidins in the subsequent extraction process, avoid the generation of hydrosol and improve essential oil yield. Furthermore, no drying was required, which can reduce the energy consumption. The homogenate process can reduce the production of dust and environmental pollution, meanwhile, avoid the degradation and deterioration of some thermo-sensitive compounds. Through comparison, solvent-free microwave distillation was selected as the optimal method, and the 71% ethanol volume fraction was chosen for homogenate extraction. Based on the yields of essential oil, flavonols and proanthocyanidins, the process parameters (microwave irradiation power and time for essential oil distillation; homogenate time, liquid-solid ratio, and ethanol volume fraction for flavonol and proanthocyanidin extraction) were optimized. Due to the combined effects of these parameters, greater advantages were found for the proposed process compared with traditional methods. Therefore, the proposed technique is a good alternative for distilling essential oil and extracting non-volatile components from edible plants.

中文翻译：

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从新鲜肉桂中提取精油、黄酮醇和原花青素的改进方法。使用无溶剂微波辅助蒸馏然后匀浆提取叶子

摘要 建立了一种高效的无溶剂微波辅助蒸馏-匀浆提取法（SFMD-HE），分离了肉桂中的精油、非挥发性黄酮醇和原花色素。树叶。本工作采用的SFMD-HE技术中，系统中没有引入过量的水，可以减少后续提取过程中黄酮醇和原花青素的损失，避免水溶胶的产生，提高精油得率。此外，无需干燥，可降低能耗。均质过程可以减少粉尘的产生和环境污染，同时避免一些热敏性化合物的降解和变质。通过比较，选择无溶剂微波蒸馏作为最佳方法，并选择 71% 乙醇体积分数进行匀浆提取。基于精油、黄酮醇和原花色素的收率，优化了工艺参数（精油蒸馏的微波辐射功率和时间；黄酮醇和原花色素提取的匀浆时间、液固比和乙醇体积分数）。由于这些参数的综合影响，与传统方法相比，所提出的工艺具有更大的优势。因此，所提出的技术是蒸馏精油和从食用植物中提取非挥发性成分的良好替代方法。优化了工艺参数（精油蒸馏的微波辐射功率和时间；黄酮醇和原花青素提取的匀浆时间、液固比和乙醇体积分数）。由于这些参数的综合影响，与传统方法相比，所提出的工艺具有更大的优势。因此，所提出的技术是蒸馏精油和从食用植物中提取非挥发性成分的良好替代方法。优化了工艺参数（精油蒸馏的微波辐射功率和时间；黄酮醇和原花青素提取的匀浆时间、液固比和乙醇体积分数）。由于这些参数的综合影响，与传统方法相比，所提出的工艺具有更大的优势。因此，所提出的技术是蒸馏精油和从食用植物中提取非挥发性成分的良好替代方法。