Optimization of extraction of phenolic compounds from wheat using response surface methodology

The optimum conditions for the extraction of crude phenolics from whole grain and bran of soft and hard wheat were determined using response surface methodology (RSM). A face-centered cubic design (FCD) was used to investigate the effects of three independent variables, namely solvent composition (%), extraction temperature (°C) and time (min) on the response, total antioxidant activity (TAA). The independent variables were coded at three levels and their actual values selected on the basis of preliminary experimental results. The FCD consisted of 14 experimental points and three replications at the center point. Data were analyzed using design expert and statistical analysis system software. A second-order polynomial model was used for predicting the response. Regression analysis showed that more than 89% of the variation was explained by the models. Canonical analysis of surface responses revealed that the stationary surface was a saddle. The optimal conditions forthe TAA obtained using ridge analysis were 54%, 61 °C, 64 min and 49%, 64 °C, 60 min, for whole grain and bran of soft wheat, respectively. Under the optimum conditions the corresponding predicted response values for TAA were 56.5 and 63 TE. The crude phenolics were extracted under optimum conditions to check the validity of the model. The values were 54.7 ± 3.2 and 61.3 ± 1.9 TE, for whole grain and bran of soft wheat, respectively; A similar trend was observed for TAA of hard wheat. The experimental values agreed with those predicted, thus indicating suitability of the model employed and the success of RSM in optimizing the extraction conditions.     

基于响应曲面法优化天麻多酚的提取工艺

目的:对天麻总多酚的提取工艺进行优化。方法:以天麻为材料在单因素实验结果的基础上,采用三因素三水平的Box-Behnken响应曲面设计。结果:天麻提取的最佳条件为乙醇浓度57%,提取温度69℃,提取时间53min,该条件下多酚提取含量达44.96mg GAE/g,且提取温度对总多酚的得率影响最大。结论:在最佳条件下天麻多酚得率实际值是预测值的98.48%,接近预测值,可用于天麻多酚的提取。      

响应面法优化超声波辅助提取猕猴桃果皮多酚工艺研究

采用超声波辅助提取猕猴桃果皮多酚,并利用响应面法对多酚提取工艺进行优化。在单因素实验的基础上,采用四因素三水平的响应面实验优化设计,研究超声波功率、提取时间、提取温度、液料比对多酚提取量的影响。结果显示最佳提取工艺条件为:超声波功率384.00 W,提取时间30 min,提取温度65.00℃,液料比23.00 m L/g,多酚提取量的实验值为（28.10±0.38）mg GAE/g,与理论预测值（28.14 mg GAE/g）相差不大。通过体外1,1-二苯基-2-三硝基苯肼（1,1-diphenyl-2-picrylhydrazyl,DPPH）自由基清除力测定多酚的抗氧化性,并且得到猕猴桃果皮多酚的EC50值为0.13 mg/m L,说明提取的多酚具有很好的抗氧化性。      

响应面法优化超声辅助提取核桃叶多酚的工艺研究

首次以陇南核桃叶为原料,运用超声波辅助提取技术对核桃叶中的多酚类物质进行提取,在温度为40℃,超声功率为110W的条件下,考察了料液比、超声时间、乙醇浓度对多酚提取率的影响,并利用响应面法优化了提取工艺,得出最佳工艺参数为:料液比为1∶10,超声提取时间为10min,乙醇浓度为70%,在最佳提取工艺的条件下,核桃多酚的含量可达到4.04mg/g,为核桃叶多酚的进一步开发提供了依据。     

响应面法优化胡麻籽壳多糖超声提取工艺

采用超声法提取胡麻籽壳多糖。在单因素试验的基础上,采用四因素三水平响应面分析法,以多糖得率为响应值,优化提取工艺条件,并将超声提取法与热水浸提法进行比较。结果表明:超声提取胡麻籽壳多糖的最佳工艺条件为超声功率80 W、超声温度56℃、液固比49∶1、超声时间21min、提取次数2次,在此条件下胡麻籽壳多糖得率为2.70%;与热水浸提法相比,超声提取法能耗低、得率高,且提取时间短。     

油茶籽多酚超声辅助提取的响应面优化

采用Plackett-Burman(PB)筛选和中心组合设计(cen-tral composite design,CCD)对影响油茶籽多酚甲醇超声辅助提取过程的5个因素进行筛选及优化,确定最优超声辅助提取条件:提取温度50℃,料液比1∶38(m∶V),超声时间40min,甲醇体积分数60%,pH值为7,该条件下油茶籽多酚提取量可达21.037 7mg/g。     

Optimization of extraction of phenolic content from hazelnut shell using response surface methodology

Response surface methodology was applied to predict the optimum conditions for extraction of phenolic compounds in hazelnut shell. The phenolic content in the shell extract was determined spectrophotometrically according to the Folin‐Ciocalteu method and expressed as gallic acid equivalent (mg GAE g^?1). Two central composite designs were used to investigate the effects of two independent variables, namely solvent composition (%) and extraction time (min), on phenolic extraction. In a first series of repeated batch extractions, the solvent consisted of different methanol percentages in distilled water at pH 4, while in a second series methanol was substituted by ethanol. The highest phenolic content (6.67 mg GAE g^?1 of shell) was predicted at the extraction conditions of 55.7% ethanol and 108.7 min. These best conditions, obtained and applied to 13 different cultivars, showed values varying from 9.18 mg GAE g^?1 of shell for Barcelona to 3.00 mg GAE g^?1 of shell for Tonda di Giffoni. Copyright © 2007 Society of Chemical Industry     

响应面优化超声辅助提取胡萝卜叶总黄酮的工艺研究

采用超声辅助提取法对胡萝卜叶中黄酮类化合物进行提取。在单因素试验的基础上,选择超声温度、液料比、乙醇浓度、超声时间为自变量,总黄酮提取率为响应值,研究四个因素及其交互作用对总黄酮提取率的影响。利用响应面进行分析,确定超声辅助提取胡萝卜叶总黄酮的最佳工艺条件为:超声温度为71℃,液料比为15mL/g,乙醇浓度为72%,超声时间为40 min。在上述条件下,总黄酮的提取率达到42.13 mg/g,与预测值的相对误差为0.33%,说明该回归模型的拟合度较高,可用于胡萝卜叶总黄酮提取工艺的优化。     

Optimization of the extraction of phenolic compounds from red grape marc (Vitis vinifera L.) using response surface methodology

Optimization of the extraction of total polyphenols (TPC), flavanols (FL), total anthocyanins (TA) and total tannins (TT) from grape marc by the response surface methodology is important to improve the recovery of these high-value phytochemicals. The independent variables studied were ethanol concentration (% EtOH), extraction time (h) and liquid-to-solvent ratio (L/S). TPC, FL, TT and TA showed different patterns of extractability, with significant variation in the linear, quadratic and interaction effects of the independent variables. The optimal extraction conditions were determined and the quadratic response surfaces were drawn from the mathematical models. The optimal extraction conditions were: 57% EtOH, 17?h, 50:1 L/S for TPC; 57% EtOH, 13?h, 50:1 L/S for FL; 62% EtOH, 16?h, 50:1 L/S for TT and 52% EtOH, 6?h, 10:1 L/S for TA. These optimum conditions yielded: 24?mg GAE/g DM of TPC; 1.5?mg quercetin/g DM of FL; 18?mg catechin/g DM of TT and 6?mg malvidin/g DM of TA.     

Optimization of ultrasound-assisted extraction of quercitrin from Houttuynia cordata Thunb. using response surface methodology and UPLC analysis

In this study, the optimal conditions for quercitrin extraction from Houttuynia cordata Thunb. (HC) were evaluated using the response surface methodology (RSM). The quercitrin was analyzed and method validated by ultra performance liquid chromatography carried out with a photodiode array detector (UPLC-PDA). Central composite design (CCD), a type of RSM, was applied to estimate the influence of three independent variables, the extraction temperature, extraction time, and extraction concentration, on the quercitrin yield. Analysis of variance (ANOVA) showed a good model fit (r ²=0.8863). The predicted optimal quercitrin yield was 1.497% under an extraction temperature of 80°C and an extraction time of 34 min in a solvent of 95% methanol. Using these optimal conditions, the experimentally obtained quercitrin yield was 1.483% (±0.03), which agrees closely with the predicted value.     

响应面法优化超声辅助提取胡麻粕中多酚工艺条件

以多酚提取量为指标,在单因素试验的基础上,通过响应面法优化了超声辅助提取胡麻粕中多酚的工艺条件。结果表明,超声辅助提取胡麻粕中多酚的最佳工艺条件为:以体积分数54%的乙醇溶液为提取剂,在料液比1∶20、超声功率240 W、提取温度57℃的条件下,提取40 min。在最佳工艺条件下,胡麻粕中多酚提取量为10.14 mg/g。     

新疆红肉苹果多酚的超声波辅助提取工艺优化

利用响应面法优化超声波辅助提取新疆红肉苹果多酚的工艺条件。以新疆红肉苹果为试验原料,在单因素试验基础上选择提取时间、超声功率、提取温度及料液比4个因素进行响应面设计,采用Box-Behnken中心组合试验设计和响应面分析法,确定红肉苹果多酚的最佳提取工艺。结果表明,红肉苹果多酚的最佳提取参数为:料液比14(g/mL),超声功率360 W,提取温度62℃,提取时间20min。在该最佳条件下,新疆红肉苹果多酚得率达到2.135mg/g。该结果可为苹果多酚的实际生产提供借鉴。     

响应面法优化超声波辅助提取

采用超声波辅助萃取法提取文冠果种皮中的总皂苷。考察了乙醇体积分数、超声波功率、料液比、提取时间和提取温度对总皂苷提取率的影响,在单因素试验的基础上选取对总皂苷提取率影响显著的料液比、乙醇体积分数和超声波功率,利用Box-Behnken设计原理,以总皂苷提取率为响应值进行响应面试验,建立了回归方程,得到了优化的提取条件（料液比1∶30,乙醇体积分数73%,超声波功率220 W）。在提取温度50℃、提取时间90 min及优化的提取条件下,文冠果种皮总皂苷提取率达0.30%。     

响应面法优化超声辅助提取牡丹籽粕中多酚工艺

采用超声辅助提取牡丹籽粕中多酚,分别考察液料比、乙醇体积分数、超声时间、超声温度、超声功率对多酚提取量的影响,在单因素试验的基础上,通过响应面法优化提取工艺。结果表明,超声辅助提取牡丹籽粕中多酚的最佳工艺条件为:超声功率300 W,液料比20∶1,超声时间98 min,乙醇体积分数80%,超声温度50℃。在最佳工艺条件下,牡丹籽粕中多酚提取量为17.42 mg/g。     

响应面法优化竹叶椒总木脂素的超声提取工艺

目的:优化竹叶椒总木脂素的超声提取工艺。方法:以竹叶椒总木脂素得率为指标,在单因素实验的基础上,采用响应面设计方法对影响木脂素得率的乙醇质量分数、液料比、提取温度、超声功率进行优化。结果:最优工艺条件为乙醇质量分数79.6%,料液比20∶1,功率为150W,温度为67.0℃时,总木脂素提取率为3.406%,实验结果与模型预测值相符。结论:利用响应面法分析结果可靠,得到竹叶椒木脂素超声辅助提取的最优工艺条件。      

响应面法优化蚕豆多酚超声辅助提取工艺

为了研究超声波辅助提取蚕豆多酚的最佳工艺条件,在单因素实验的基础上,选取乙醇体积分数、料液比、提取时间、pH为自变量,多酚提取量为响应值,根据Box-Benhnken实验设计原理,采用四因素三水平的分析法对蚕豆多酚提取量进行优化。结果表明,超声波辅助提取蚕豆多酚的最佳工艺条件为:乙醇体积分数45%、料液比1：25 (g/mL)、提取时间20 min、pH5,此条件下蚕豆多酚提取量最高为(2.03±0.16) mg/g d.w.,与预测值(2.06±0.23) mg/g d.w.相近,说明该优化方法合理可行。