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Optimization of ultrasound-assisted extraction of biomass from olive trees using response surface methodology
Ultrasonics Sonochemistry ( IF 8.4 ) Pub Date : 2018-05-26 , DOI: 10.1016/j.ultsonch.2018.05.031
José Carlos Martínez-Patiño , Beatriz Gullón , Inmaculada Romero , Encarnación Ruiz , Mladen Brnčić , Jana Šic Žlabur , Eulogio Castro

Olive tree pruning biomass (OTP) and olive mill leaves (OML) are the main residual lignocellulosic biomasses that are generated from olive trees. They have been proposed as a source of value-added compounds and biofuels within the biorefinery concept. In this work, the optimization of an ultrasound-assisted extraction (UAE) process was performed to extract antioxidant compounds present in OTP and OML. The effect of the three parameters, ethanol/water ratio (20, 50, 80% of ethanol concentration), amplitude percentage (30, 50, 70%) and ultrasonication time (5, 10, 15 min), on the responses of total phenolic content (TPC), total flavonoid content (TFC) and antioxidant activities (DPPH, ABTS and FRAP) were evaluated following a Box–Behnken experimental design. The optimal conditions obtained from the model, taking into account simultaneously the five responses, were quite similar for OTP and OML, with 70% amplitude and 15 min for both biomasses and a slight difference in the optimum concentration of ethanol. (54.5% versus 51.3% for OTP and OML, respectively). When comparing the antioxidant activities obtained with OTP and OML, higher values were obtained for OML (around 40% more than for OTP). The antioxidant activities reached experimentally under the optimized conditions were 31.6 mg of TE/g of OTP and 42.5 mg of TE/g of OML with the DPPH method, 66.5 mg of TE/g of OTP and 95.9 mg of TE/g of OML with the ABTS method, and 36.4 mg of TE/g of OTP and 49.7 mg of TE/g of OML with the FRAP method. Both OTP and OML could be a potential source of natural antioxidants.



中文翻译:

响应面法优化超声辅助从橄榄树中提取生物质

橄榄树修剪生物量(OTP)和橄榄碾碎叶片(OML)是从橄榄树中产生的主要残留木质纤维素生物质。在生物精炼概念中,已提出将其作为增值化合物和生物燃料的来源。在这项工作中,对超声波辅助提取(UAE)工艺进行了优化,以提取OTP和OML中存在的抗氧化剂化合物。乙醇/水比率(乙醇浓度的20、50、80%),振幅百分比(30、50、70%)和超声处理时间(5、10、15分钟)这三个参数对总响应的影响按照Box–Behnken实验设计评估了酚含量(TPC),总类黄酮含量(TFC)和抗氧化剂活性(DPPH,ABTS和FRAP)。从模型获得的最佳条件,同时考虑到这五个响应,OTP和OML的响应非常相似,两种生物量的幅度分别为70%和15分钟,并且乙醇的最佳浓度略有差异。(OTP和OML分别为54.5%和51.3%)。当比较用OTP和OML获得的抗氧化活性时,获得的OML值更高(比OTP高40%左右)。在最佳条件下实验达到的抗氧化活性为:DPPH法为31.6 mg TE / g OTP和42.5 mg TE / g OML,66.5 mg TE / g OTP和95.9 mg TE / g OML。分别采用ABTS方法和采用FRAP方法的36.4 mg TE / g OTP和49.7 mg TE / g OML。OTP和OML都可能是天然抗氧化剂的潜在来源。两种生物质的振幅分别为70%和15分钟,并且乙醇的最佳浓度略有差异。(OTP和OML分别为54.5%和51.3%)。当比较用OTP和OML获得的抗氧化活性时,获得的OML值更高(比OTP高40%左右)。在最佳条件下实验达到的抗氧化活性为:DPPH法为31.6 mg TE / g OTP和42.5 mg TE / g OML,66.5 mg TE / g OTP和95.9 mg TE / g OML。分别采用ABTS方法和采用FRAP方法的36.4 mg TE / g OTP和49.7 mg TE / g OML。OTP和OML都可能是天然抗氧化剂的潜在来源。两种生物质的振幅分别为70%和15分钟,并且乙醇的最佳浓度略有差异。(OTP和OML分别为54.5%和51.3%)。当比较用OTP和OML获得的抗氧化活性时,获得的OML值更高(比OTP高40%左右)。在最佳条件下实验达到的抗氧化活性为:DPPH法为31.6 mg TE / g OTP和42.5 mg TE / g OML,66.5 mg TE / g OTP和95.9 mg TE / g OML。分别采用ABTS方法和采用FRAP方法的36.4 mg TE / g OTP和49.7 mg TE / g OML。OTP和OML都可能是天然抗氧化剂的潜在来源。当比较用OTP和OML获得的抗氧化活性时,获得的OML值更高(比OTP高40%左右)。在最佳条件下实验达到的抗氧化活性为:DPPH法为31.6 mg TE / g OTP和42.5 mg TE / g OML,66.5 mg TE / g OTP和95.9 mg TE / g OML。分别采用ABTS方法和采用FRAP方法的36.4 mg TE / g OTP和49.7 mg TE / g OML。OTP和OML都可能是天然抗氧化剂的潜在来源。当比较用OTP和OML获得的抗氧化活性时,获得的OML值更高(比OTP高40%左右)。在最佳条件下实验达到的抗氧化活性为:DPPH法为31.6 mg TE / g OTP和42.5 mg TE / g OML,66.5 mg TE / g OTP和95.9 mg TE / g OML。分别采用ABTS方法和采用FRAP方法的36.4 mg TE / g OTP和49.7 mg TE / g OML。OTP和OML都可能是天然抗氧化剂的潜在来源。用FRAP方法测得7毫克TE /克OML。OTP和OML都可能是天然抗氧化剂的潜在来源。用FRAP方法测得7毫克TE /克OML。OTP和OML都可能是天然抗氧化剂的潜在来源。

更新日期:2019-03-12
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