超临界反溶剂工艺在线颗粒形成的加压有机溶剂萃取

D. Santos, D. F. Barbosa, Ketllen Broccolo, M. Thereza, M. Gomes, Renata Vardanega, M. Angela, A. Meireles
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引用次数: 19

摘要

在这项工作中,开发了一种新的在线工艺,用于从植物中加压热有机溶剂提取抗氧化剂,以及有或没有载体材料的提取物在一步中沉淀。这个过程被称为OEPO,有机溶剂外反应和在线颗粒形成。利用超临界CO2作为反溶剂进行溶剂消除,可以得到有机溶剂残留浓度极低(< 50 ppm)的不同产品。OEPO工艺包括加压液体萃取(PLE)-超临界抗溶剂(SAS)沉淀、PLE-SAS共沉淀法和PLE-超临界流体萃取乳剂(SFEE)。以巴西人参根(Pfa ffiaglomerata)为模型,乙酸乙酯为萃取溶剂,成功地开发了OEPO工艺。并将各工艺的抗氧化活性与各工艺的抗氧化活性进行了比较。此外,还以乙酸乙酯为萃取溶剂,对萃取过程中抗氧化剂的回收率进行了优化研究。在适当的提取温度(373 K)和较高的静态提取时间(15 min)下,得到了最佳的PLE提取物。在此条件下,反应收率为1%,抗氧化活性为53%,比沉淀后和分两步(第一步-萃取;第二步-利用第一步储存的萃取液进行SAS沉淀。在PLE-SAS共沉淀法和PLE-SFEE中观察到类似的行为(串联过程产生的p产品与单独进行的两步工艺相似),这表明本研究开发的OEPO工艺可以被认为是一种合适的、有前途的工艺,只需一步就可以直接从植物材料中获得不同的产品(沉淀提取物、共沉淀提取物或悬浮胶囊提取物)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pressurized Organic Solvent Extraction with On-line Particle Formation by Supercritical Anti Solvent Processes
In this work, anovel on-line process for pressurised hot organic solvent extraction of antio xidants from plantsas well as precip itation of the extract with or without a carrier material in one step was developed. This process has been called OEPO,Organic solvent Ext raction and On-line particle formation. With this process, different products with a very low residual organic solvent concentration (< 50 ppm) can be obtained by the use of supercritical CO2 as anti solvent for solvent elimination.OEPO process consists of hyphenated Pressurized Liquid Extraction (PLE)-Supercritical Anti So lvent (SAS) precipitation, PLE-SAS co-p recipitat ion and PLE-Supercritical Fluid Ext raction of Emulsions (SFEE). OEPO process was successfully developed using Brazilian g inseng roots (Pfa ffiaglomerata)as a model case using ethyl acetate as extracting solvent. Results were co mpared, in terms of antio xidant activity o r mo rphology, with the ones obtained by each process separately.In addition, an optimizat ion study for antio xidants recovery was performed using ethyl acetate as extracting solvent during PLE process. Optimu m PLE extracts were produced under moderate extraction temperature (373 K) and high static extraction t ime (15 min). Under this condition an ext raction yield o f 1% (d ry basis, d.b.) and an antioxidant activity of 53% are obtained, wh ich was appro ximately 14% higherthan that observed after PLE-SAS p recipitation and after SAS precipitation performed in two steps (step one - PLE ext raction; step two - SAS precipitation by the use of the ext ract solution produced by step one stored).Similar behavior (hyphenated process producing similar p roducts than the two step process done separately) was observed for PLE-SAS co-precip itation and PLE-SFEE indicating that the OEPO process developed in this work can be considered as a suitable and p ro mising process to obtain, in only one step, different products (precipitated extract, co-precipitated extract or encapsulated extract in suspension), direct ly fro m plant materials.
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