期刊
MOLECULES
卷 26, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/molecules26041033
关键词
pomegranate pomace; vacuum microwave assisted extraction (VMAE); modified response surface optimization; historical data design; polyphenols; flavonoids; industrial scale optimization
资金
- European Regional Development Fund of the European Union
- Greek national funds through the Operational Program Competitiveness, Entrepreneurship and Innovation [T1EDK-03942]
Through vacuum microwave assisted extraction, high added value natural extracts can be obtained from raw pomegranate pomace, and successfully applied at an industrial scale. The study optimized VMAE conditions using response surface methodology, resulting in maximum recovery of total polyphenols and total flavonoids.
Pomegranate pomace (PP) is the solid waste produced in bulk by the pomegranate juice industry which is rich in polyphenols and flavonoids that can replace the hazardous chemical antioxidants/antimicrobials currently used in the agro-food and cosmetics sectors. In the present work, the vacuum microwave assisted extraction (VMAE) of natural antioxidants from raw pomegranate pomace was investigated and successfully optimized at an industrial scale. For the optimization of PP VMAE a novel, highly accurate response surface methodology (RSM) based on a comprehensive multi-point historical design was employed. The optimization showed that the maximum recovery of PP total polyphenols as well as total PP flavonoids were obtained at microwave power = 4961.07 W, water to pomace ratio = 29.9, extraction time = 119.53 min and microwave power = 4147.76 W, water to pomace ratio = 19.32, extraction time = 63.32 min respectively. Moreover, the optimal VMAE conditions on economic grounds were determined to be: microwave power = 2048.62 W, water to pomace ratio = 23.11, extraction time = 15.04 min and microwave power = 4008.62 W, water to pomace ratio = 18.08, extraction time = 15.29 min for PP total polyphenols and PP total flavonoids respectively. The main conclusion of this study is that the VMAE extraction can be successfully used at industrial scale to produce, in economic manner, high added value natural extracts from PP pomace.
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