响应面法优化余甘叶中黄酮提取工艺

以余甘叶为试材,利用超声波辅助提取余甘叶黄酮,研究料液比、乙醇浓度、超声时间、超声功率对黄酮提取率的影响,并在单因素试验的基础上,通过响应面分析法优化提取工艺。结果表明,余甘叶中黄酮最佳超声提取条件为：料液比1∶73、乙醇浓度50%、超声时间30 min、超声功率210 W,在此条件下黄酮实际提取率为19.51%。     

响应面法确定藤茶黄酮提取的最佳工艺

在单因素实验的基础上,用二水平实验确定影响藤茶中黄酮得率的主要因素,通过响应面分析法确定最佳提取条件为:乙醇体积分数60%,温度70℃,料液质量比1:30,浸提2次。     

利用响应面分析法优化山楂中总黄酮提取条件

通过响应面分析法对山楂中总黄酮的提取工艺进行优化。利用响应面实验设计考察乙醇浓度、提取温度、提取时间、液固比四因素对总黄酮提取率的影响。用自编MATLAB程序对实验数据进行二次响应面分析。得出山楂总黄酮的最佳提取条件为:乙醇浓度66%、提取温度83℃、提取时间2 h、固液比19∶1,提取率为74.72%,与模型预测值基本相符。     

余甘子总黄酮超声波辅助提取工艺的优化

以余甘子干粉为材料,利用超声波辅助提取余甘子总黄酮。单因素试验分析液料比、乙醇浓度、超声时间、超声功率对余甘子总黄酮提取率的影响,在此基础上,利用响应面分析法对提取工艺进行优化。结果表明,余甘子总黄酮最佳提取条件为：液料比82:1(V/W)、乙醇浓度45%、超声时间41 min、超声功率210 W,在此条件下余甘子总黄酮的实际提取率为6.12%。     

响应面法优化益母草总黄酮的提取工艺研究

采用响应面法优化超声提取益母草总黄酮的工艺条件。方法:在超声时间、超声功率、超声温度、料液比等单因素的基础上,通过中心组合设计原理采用三因子三水平的响应面分析法设计,对单因子显著性和交互作用进行分析。结果:超声提取益母草总黄酮的最佳工艺条件为:超声时间35.54 min,料液比1∶30.63,乙醇浓度73.41%。此时吸光度为0.295 9。在此条件下益母草的总黄酮提取率为1.21%。结论:优化的提取工艺条件,益母草的总黄酮提取率高,节约资源。     

响应面法优化细果角茴香中总黄酮的超声提取条件

采用响应面法优化超声波辅助提取细果角茴香中总黄酮的工艺研究。在单因素试验的基础上,选择超声时间、乙醇浓度、料液比为自变量,以总黄酮的提取率为响应值,进行Box-Behnken中心组合实验设计,采用响应面法(RSM)评估了这些因素对总黄酮提取率的影响。结果表明:超声波法辅助提取细果角茴香中总黄酮的最佳工艺条件为液料比33 mL/g,乙醇浓度为58%,提取时间为34.5 min。在此条件下,总黄酮的提取率达1.525%。     

响应面法优化酶法提取枸杞多糖的研究

选用响应面法优化及正交实验法进行淀粉酶提取枸杞多糖实验设计及分析。通过单因素实验后,正交实验确定淀粉酶酶解提取枸杞多糖的最佳条件为:pH=5.0,温度50℃,时间80 min,加酶量为0.5%,枸杞多糖提取率12.1%;响应面分析确定淀粉酶酶解提取枸杞多糖的最佳条件为酶解温度49.56℃、酶解时间140 min、酶浓度0.3%,枸杞多糖提取率为13.25%。酶法提取枸杞多糖比传统热水浸提提高了枸杞多糖的提取率,反应条件温和,而且通过响应面法进行实验设计和优化比正交实验法能得到更高的枸杞多糖提取率。     

响应面优化-超声提取黄姜中总黄酮工艺研究

目的:利用响应面法对黄姜总黄酮的提取工艺进行优化.方法:在单因素的基础上以超声功率、超声时间、料液比、乙醇浓度为响应因素,黄姜总黄酮的提取率为响应值,根据中心组合实验原理,采用四因素三水平的响应面分析法.结果:确定提取最佳工艺参数为超声时间29.53 min、超声功率为400.76w、料液比为1:42.19、乙醇浓度为79.60％,在此条件下总黄酮提取率的预测值为11.15 (mg/g).结论:考虑到实际操作的问题,将提取最佳工艺参数修正为超声时间30 min、超声功率400w、料液比1:40、乙醇浓度80％,进行3次平行试验,结果总黄酮提取率为11.09 mg/g,绝对误差为0.057％,说明实验结果与模型吻合很好.     

响应面法优化康定鼠尾草中迷迭香酸提取工艺

利用单因素实验和响应面法优化康定鼠尾草中迷迭香酸提取工艺。采用高效液相色谱法测定迷迭香酸含量,以提取率为参考指标。通过单因素实验筛选出料液比、提取时间和乙醇浓度三个主要因素,通过BoxBehnken设计方案,建立迷迭香酸提取得率的二次回归方程,得到优化组合条件。最佳提取条件为乙醇浓度40%,液固比15∶1,提取时间50 min。最佳提取条件下,迷迭香酸提取得率为12.30 mg/g。优化得到的康定鼠尾草中迷迭香酸的提取工艺合理,操作可行,质量稳定。     

响应面法超声辅助提取优化蛇床子素工艺的研究

对独活中蛇床子素超声提取工艺进行了研究。在单因素实验的基础上,选取了对蛇床子素提取率影响较大的4个因素(温度、乙醇体积分数、提取时间和料液比)。采用响应曲面分析法,建立了独活中蛇床子素提取的二次多项式数学模型,优化蛇床子素的超声提取最佳工艺条件,在温度64.63℃,乙醇体积分数73.18%,提取时间45.33 min,料液比20.67 mL/g条件下蛇床子素最大提取率达到0.987%。表明响应面法超声辅助提取优化蛇床子素工艺的研究方法简便、可靠。     

响应面设计法优化仙鹤草总多酚的超声提取工艺

在单因素实验的基础上,采用响应面分析法对影响超声辅助提取仙鹤草总多酚得率的主要因素(超声温度、料液比和乙醇浓度)进行优化,建立了影响因素与总多酚之间的函数关系。获得最佳工艺条件为:71%乙醇,料液比1∶24,超声提取温度60℃,提取时间20 min。在此最佳条件下,总多酚得率为3.56%,试验结果与模型预测值相符。     

Response surface method was used to optimize the ultrasonic assisted extraction of flavonoids from Crinum asiaticum

In this study, ultrasound-assisted extraction of flavonoid from Crinum asiaticum was studied through response surface methodology (RSM) to gain the best extraction process of flavonoid and enhance the extraction rate of flavonoid. In the following RSM experiment, we selected the corresponding data of every factor as the center point through the single-factor experiments, then the experimental data was subjected to multiple regression analysis. According to the statistical analysis results, the results were consistent with the polynomial regression model, the determination coefficient (R2) was 0.9769. The best conditions for maximum flavonoid yield were 60% ethanol concentration, 64 °C for extraction temperature, 1:28 (v/w) solid-to-liquid ratio with extraction time for 47 min. The best response of flavonoid yield was 1.63972%. The predicted results for best reaction conditions were in good agreement with experiment values. Ultrasound-assisted extraction method can enhance the extraction rate of flavonoid significantly. It is a powerful tool to extract of important phytochemicals from nature plant.     

Extraction,development and validation of HPLC-UV method for rapid and sensitive determination of colchicine from Colchicum autumnale L. Bulbs

Colchicum autumnale L. also known as the autumn crocus, contains colchicine alkaloid having antifungal properties. The tuber of this plant is rich in terms of colchicine. In this research an ultrasound-assisted extraction (UAE) method was optimized for the extraction of colchicine from Colchicum autumnale L. bulbs before high-performance liquid chromatography with UV detection (HPLC-UV). Optimization of various extraction parameters was performed using response surface methodology (RSM) to evaluate the maximum colchicine yield from Colchicum autumnale L. bulbs. The Box-Behnken design (BBD) and RSM were used to investigate the effect of three key parameters (extraction time (20–60?min), extraction temperature (40–80?°C) and ultrasound power (500–700?W) on extraction efficiency. The variance analysis suggested that the dependent response variable of yield of colchicine may be expressed by a quadratic polynomial model. The optimal theoretical extraction conditions were found to be an ultrasonication power of 602.4?W, an extraction time of 42?min and a temperature of 64?°C. Under these conditions, the optimum foreseen yield was 0.237%. The experimental colchicine yield obtained by following the optimized conditions was found to be 0.238%. These values are very well compatible with each other.     

响应面优化纤维素酶辅助提取木豆叶总黄酮工艺

为探讨纤维素酶辅助提取木豆叶总黄酮最佳工艺条件,在单因素试验基础上,以酶用量、酶解温度、酶解时间和酶解pH为影响因子,总黄酮得率为响应值,采用Box-behnken中心组合设计建立4个影响因子与总黄酮得率关系的数学模型,进行响应面法分析。结果表明,纤维素酶辅助提取木豆叶总黄酮的最佳工艺条件为：酶用量为8.65 mg,酶解温度为33.88℃,酶解时间为2.02 h,酶解pH为5.02。在最优条件下总黄酮理论得率为4.86%,实测值为4.88%,拟合得到的模型与实际吻合良好。本研究建立的提取工艺条件稳定可靠,为以后木豆叶总黄酮的应用开发提供实验依据。     

Optimization of gelatine extraction from grass carp (Catenopharyngodon idella) fish skin by response surface methodology

To establish the optimum gelatine extraction conditions from grass carp fish skin, response surface methodology (RSM) was adopted in this study. The effects of concentration of HCl (%, A), pre-treatment time (h, B), extraction temperature ( degrees C, C) and extraction time (h, D) were studied. The responses were yield (%) and gel strength (g). A=1.19%, B=24 h, C=52.61 degrees C and D=5.12h were determined as the optimum conditions while the predicted responses were 19.83% yield and 267 g gel strength. Gelling and melting points were 19.5 degrees C and 26.8 degrees C, respectively. Moreover, grass carp gelatine showed high contents of imino acids (proline and hydroxyproline) 19.47%. RSM provided a powerful tool to optimize the extraction parameters and the results may be adapted for industrial extraction of gelatine from grass carp fish skins.     

响应面法优化飞龙掌血中总生物碱的提取工艺

以飞龙掌血（Toddalia asiatica（L.）Lam.）的根为实验材料,以总生物碱的含量为检测指标,应用响应面法对飞龙掌血中总生物碱的提取工艺进行了优化。结果显示,当提取条件为乙醇体积分数74.76%、料液比20∶1和提取时间32.87 min时,飞龙掌血提取物中总生物碱的理论含量值可达11.09 mg/g,总生物碱含量达到最高值。按照最佳提取工艺条件进行验证,3次平行实验的均值为（10.74 ±0.18）mg/g,与理论值差异较小,表明利用响应面法来优化飞龙掌血中总生物碱的最佳提取工艺模型拟合良好,具有一定实用价值。     

响应面分析法优化超声波辅助酶法提取南五味子多糖工艺的研究

为了建立超声波辅助酶法提取南五味子多糖的方法,并研究其提取工艺。按照Box-Benhnken中心组合试验设计原理,以多糖得率为响应值,以单因素实验数据为基础,进行响应面分析实验,考察提取pH、提取温度和提取时间对多糖得率的影响。结果显示：最佳提取工艺条件为：提取pH为4.8、提取温度57℃、提取时间66 min、复合酶用量为3.0%,最佳工艺条件下南五味子多糖得率为8.73%±0.25%。研究结果表明,该提取方法可减少多糖提取时间和提取溶剂用量,降低温度,有效提高了多糖的提取得率,可应用于南五味子多糖的制备。研究结果为南五味子多糖的开发应用提供了较好的依据。     

蒙古栎种壳多酚的超声辅助提取及抗氧化能力

采用超声辅助提取法对蒙古栎种壳多酚进行了提取。对超声提取过程中的各因素在单因素实验的基础上应用Box Behnken中心组合进行3因素3水平的实验设计法进行了得率与纯度双响应值的优化,得到蒙古栎种壳多酚最佳提取工艺条件为：乙醇体积分数为60.56%,液料比30.72∶1 mL·g^-1,提取时间42.39 min,在此条件下蒙古栎种壳多酚平均得率为0.38%,平均纯度为18.8%,该多酚清除DPPH自由基的EC₅₀值为176 μg·mL^-1,高于合成抗氧化剂BHA和BHT等。     

纤维素酶解-超声偶联法提取葛根中总异黄酮的工艺优化

采用酶解-超声偶联新工艺对葛根中总异黄酮提取进行优化,以提高其收率.在单因素试验的基础上,利用Box-Behnken响应面试验设计,以蒸馏水作为提取溶剂,对温度、酶浓度、时间进行三因素三水平的试验设计优化.结果表明最佳提取工艺条件为:温度34℃、酶浓度0.63 mg/mL、时间62 min.在此条件下,葛根总异黄酮提取率为7.10％,与预测值的相对误差为0.34％.酶解-超声偶联工艺是一种新型、快速、有效的总黄酮提取方法.     

Preparation and the antitumor activity in vitro of polysaccharides from Tricholoma matsutake

Tricholoma matsutake is the most valuable mushroom exhibiting a characteristic and delicate flavor as well as several biological activities among the various mushroom species. Extraction procedure and antitumor activity of polysaccharides from Tricholoma matsutake mycelium were studied in this work. Single factor tests and Response Surface Methodology (RSM) based on a three-level three-factor Box-Behnken design were applied to optimize the water extraction conditions. The polysaccharides yields increased when the ratio of water to sample increased from 10:1 to 30:1, extraction time from 1 to 4 h and temperature from 60 to 90°C as invested in single factor tests. To enhance further polysaccharides extraction, the extraction conditions were studied with RSM. The optimum extraction conditions were confirmed as follows:extraction time 4.3 h, the ratio of water to sample 29.2:1, extraction temperature 93.8°C. The extraction rate of polysaccharides under this condition could reach the highest value of 18.43% with one time extraction, and, 21.63% with two times extraction. Furthermore, the polysaccharides presented significant antitumor activity against B16 human melanoma cells in vitro in a dose-dependent manner. At the concentration of 10 mg/ml, the inhibition rate of polysaccharides got 67%.