Recovery of polyphenols from olive mill wastewater using drowning-out crystallization based separation process
Recovery of polyphenols from olive mill wastewater using drowning-out crystallization based separation process
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DOI：
10.1016/j.ifset.2016.02.014
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发表时间：
2016-04-01
影响因子：
6.6
通讯作者：
Nakajima, Mitsutoshi
中科院分区：
文献类型：
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作者：
Dammak, Ilyes;Neves, Marcos;Nakajima, Mitsutoshi
橄榄油提取产生大量的橄榄工厂废水（OMW）（1000万吨/年），需要专门的管理，以尽量减少其对环境的潜在负面影响。然而，OMW是具有广泛生物活性的多酚的丰富来源。因此，从OMW中选择性回收多酚提供了获得生物活性化合物和降低其植物毒性的双重机会。采用绿色技术，从OMW中高效提取富含多酚类物质的天然生物活性浓缩物。该清洁技术集成了离心、间歇蒸发和基于淹没结晶的分离工艺，用于根据添加乙醇后的溶解度变化将多酚与OMW中存在的不同组分分离，可作为食品级。此外，间歇蒸发用于再生乙醇的可持续过程。因此，所提出的方法提供了高度浓缩的多酚分离物（高达75%（w/w）），其中高达（510 mg/g）的多酚含量是羟基酪醇。回收的多酚可用于食品工业、化妆品工业或制药工业。工业相关性：发现通过乙醇的淹没分离过程可用于实现从OMW回收多酚的主要目标。基于添加食品级溶剂乙醇后溶解度行为的变化，所提出的方法显著提高了多酚浓度。此外，间歇蒸发进行了乙醇的再生，可以在该过程中重复使用。多酚浓缩物（高达75%（w/w））具有在食品工业中应用的潜力（例如开发含有1000 ppm多酚的优质橄榄油，或开发例如多酚含量增加的葡萄汁），或用于化妆品（例如开发具有高抗氧化剂含量的乳液/护手霜），或制成药剂（例如，开发多酚含量高的胶囊;也可被视为食品补充剂）。(C)2016爱思唯尔有限公司版权所有。
Olive oil extraction generates a large amount of olive mill wastewater (OMW) (10 million ton/year), requiring specific management to minimize its potential negative impact on the environment. However, OMW is a rich source of polyphenols having a wide range of bioactivities. For that reason, the selective recovery of polyphenols from OMW provides the double opportunity to obtain bioactive compounds and to reduce its phytotoxicity. The present study relates to a highly efficient and novel method, using green technology, for obtaining a natural bioactive concentrate rich in polyphenols from OMW. The clean technology integrates centrifugation, batch evaporation and drowning-out crystallization-based separation process, for the separation of polyphenols from the different components present in OMW, based on the solubility behavior changing after addition of ethanol, accepted as food grade. Further, batch evaporation was applied for the regeneration of ethanol for sustainable process. Consequently, the proposed method provides a highly-concentrated polyphenols isolate (up to 75% (w/w)), with up to (510 mg/g) of the polyphenols content being hydroxytyrosol. The recovered polyphenols can be of interest for the food industry, cosmetic industry, or pharmaceutical industry.Industrial relevance: Drowning-out separation process by ethanol was found useful to achieve the main target for the recovery of polyphehols from OMW. Polyphenol concentration increased considerably by the proposed method based on the solubility behavior changing after addition of ethanol, a food grade solvent. Furthermore, batch evaporation was carried out for the regeneration of ethanol, which can be reused in the process. Polyphenols concentrate (up to 75% (w/w)) developed in this study have the potential for application in food industry (e.g. to develop a premium olive oil containing 1000 ppm of polyphenols, or developing e.g. grape juice with enhanced polyphenols content), or into cosmetics (e.g. developing a lotion/hand cream with high antioxidant content), or into pharmaceutics (e.g. developing capsules high polyphenols content; which could also be considered as food supplement). (C) 2016 Elsevier Ltd. All rights reserved.