微波辅助提取万寿菊花总黄酮的工艺研究

以万寿菊花粉末为原料,采用单因素和正交实验考察了微波辅助提取的微波功率、微波辐射时间、乙醇浓度和料液比对万寿菊花总黄酮得率的影响。结果表明,微波辅助提取万寿菊花总黄酮的最佳工艺条件为:微波功率480 W,微波辐射时间120 s,乙醇浓度70%,料液比1∶40,提取次数2次。在此最佳工艺条件下,万寿菊花总黄酮得率达到40.45 mg/g。     

微波辅助提取马蹄皮总黄酮的工艺研究

探讨了微波辅助提取马蹄皮总黄酮的工艺条件。采用分光光度法测定马蹄皮总黄酮的含量,在单因素实验的基础上确定微波辅助提取马蹄皮总黄酮的最佳工艺条件为:微波功率300 W,微波辐射时间5 m in,乙醇浓度40%,料液比1∶25。在最佳工艺条件下,马蹄皮总黄酮提取率达1.31%,比相同条件下普通浸提法提取2 h的提取率提高12.93%。微波辅助提取马蹄皮总黄酮是一种快速高效的新方法。     

莲子心总黄酮的微波辅助提取研究

研究了莲子心中总黄酮的微波辅助提取工艺条件.以芦丁为对照品,采用分光光度法测定莲子心中总黄酮的含量,探讨了乙醇质量浓度、固液比(g:mL)、微波辐射功率、微波辐射时间等因素对莲子心总黄酮提取率的影响;采用单因素实验和正交实验确定微波辅助提取莲子心总黄酮的优化工艺条件如下:乙醇质量浓度65%、固液比1:25(g:mL)、...     

微波辅助萃取废烟叶中茄尼醇工艺研究

研究了微波辅助萃取废烟叶中茄尼醇的工艺条件, 对微波功率、辐射时间和萃取溶剂等影响微波萃取的条件进行了筛选和分析, 优化条件为:以正己烷+乙醇为萃取溶剂, 固液比为1∶45, 物料水分 3%以下, 微波功率 280w, 辐射时间 25min。     

微波提取苹果渣中总黄酮的工艺研究

采用微波辐射技术,以乙醇提取苹果渣中黄酮类化合物。考察了乙醇浓度、微波功率、处理时间、料液比和浸泡时间对总黄酮提取率的影响。结果表明,最佳工艺条件为:70%乙醇,微波萃取2 min,微波功率为350 W,料液比1∶30(g/mL),总黄酮1次提取率0.683 7%。     

微波辅助提取藜蒿黄酮的研究

进行了微波辅助提取藜蒿总黄酮的实验。分别采用单因素法和正交实验法探讨了各因素的影响。结果得到微波辅助萃取藜蒿总黄酮的最佳工艺条件为：固液比为1g：25mL,溶剂乙醇浓度为20％,微波功率为320W,辐射时间60s,溶液pH为10,此时藜蒿总黄酮提取率最高,约为0．870％。     

纤维素酶-微波辅助提取银杏叶总黄酮及抗氧化性能研究

研究了纤维素酶-微波辅助提取银杏叶总黄酮的工艺,并对乙醇提取法、纤维素酶辅助提取法、微波辅助提取法和纤维素酶-微波辅助提取法4种工艺进行了对比,结果表明,采用纤维素酶-微波辅助提取法工艺效果最佳,最佳条件为:纤维素酶质量分数为5%(与银杏叶的质量比),酶解时间为1 h,酶解温度为50℃,累计微波时间为2 min,乙醇质量分数为70%,液料比为30∶1,此时,银杏叶总黄酮的提取率达到3.96%,是乙醇提取法提取率的2.6倍。     

微波辅助提取枸杞中的总黄酮工艺研究

目的:探寻枸杞中总黄酮提取的最佳工艺。方法:设计正交试验,采用微波辅助有机溶剂法对枸杞中总黄酮提取方法进行了研究。结果:微波辅助提取枸杞中总黄酮的最佳工艺条件为:96%工业乙醇,固液比1:12,微波功率400W,微波辅助回流40min。实现枸杞黄酮浸膏得率62.72%,浸膏中总黄酮含量达2.69%的优化提取工艺。结论:以该工艺提取枸杞中总黄酮,保证了较高的黄酮含量,优化了枸杞中总黄酮的提取工艺。     

微波辅助提取花生壳总黄酮的工艺优化

以花生壳为原料,采用微波辅助提取花生壳中的总黄酮。探讨了乙醇体积分数、微波时间、料液比和提取温度对总黄酮提取的影响。在单因素的基础上,通过正交试验优化工艺。结果表明,最佳提取工艺条件为:微波时间2min,提取温度50℃,乙醇体积分数70%,料液比1∶25(g/m L),在此工艺条件下,花生壳总黄酮的提取率为8.9436%。     

微波辅助提取红菊苣叶总黄酮的工艺优化

实验研究微波辅助提取红菊苣中总黄酮的工艺优化。以总黄酮为指标,通过单因素和正交实验探究微波条件下黄酮提取率的最佳条件。实验结果表明:当料液比(g/m L为1:40,乙醇浓度70%,在80℃条件下提取15 min,红菊苣中总黄酮提取率为4.14%。     

Optimization of microwave-assisted extraction of bioactive compounds from pistachio (Pistacia vera L.) hull

ABSTRACT

Phenolic compounds were extracted from pistachio hull using microwave-assisted solvent extraction (MASE). The effects of four parameters, microwave power, extraction time, solvent to sample ratio, and ethanol concentration were evaluated. The extraction conditions were optimized by response surface methodology to enhance the total phenolic content (TPC). Optimal conditions were found as 140 W microwave power, 4.5 min extraction time, 19:1 (v/w) solvent to sample ratio, and 56% ethanol concentration to get maximum TPC (62.24 mg GAE/g dry hull). Also, MASE was compared with conventional solvent extraction (CSE) and MASE gave higher TPC, yield, and antioxidant activity.     

Optimization of Total Flavonoid Compound Extraction from Gynura medica Leaf Using Response Surface Methodology and Chemical Composition Analysis

Optimization of total flavonoid compound (TFC) extraction from Gynura medica leaf was investigated using response surface methodology (RSM) in this paper. The conditions investigated were 30-60% (v/v) ethanol concentration (X(1)), 85-95 °C extraction temperature (X(2)) and 30-50 (v/w) liquid-to-solid ratio (X(3)). Statistical analysis of the experiments indicated that temperature and liquid-to-solid ratio significantly affected TFC extraction (p < 0.01). The Box-Behnken experiment design showed that polynomial regression models were in good agreement with the experimental results, with the coefficients of determination of 0.9325 for TFC yield. The optimal conditions for maximum TFC yield were 55% ethanol, 92 °C and 50 (v/w) liquid-to-solid ratio with a 30 min extraction time. Extracts from these conditions showed a moderate antioxidant value of 54.78 μmol quercetin/g dry material (DM), 137.3 μmol trolox/g DM for 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 108.21 μmol quercetin/g DM, 242.31 μmol trolox/g DM for 2,2-azino-bis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS(+)), respectively. HPLC-DAD-MS analysis showed that kaempferol-3-O-glucoside was the principal flavonoid compound in Gynura medica leaf.     

Microwave-assisted extraction of chlorogenic acid from flower buds of Lonicera japonica Thunb.

An efficient microwave-assisted extraction (MAE) technique has been developed to recover chlorogenic acid from flower buds of Lonicera japonica Thunb. The yield of chlorogenic acid rapidly reached 6.14% within 5 min under the optimal MAE conditions, i.e. 50% ethanol as extraction solvent, 1:10 (w/v) of the solid/liquid ratio and 60 °C of extraction temperature. The MAE showed obvious advantages in terms of short duration and high efficiency to recover chlorogenic acid from raw plant materials in comparison with conventional heat-reflux extraction. The mechanism of the enhanced extraction by microwave assistance was discussed by observing cell destruction of plant material after MAE treatment by scanning electron microscopy. The results showed that the plant materials were significantly destroyed due to the cell rupture after MAE treatment.     

微波法提取黑木耳黄酮类化合物的研究

采用微波法提取了黑木耳中黄酮类化合物,考察了微波辐射功率、微波辐射时间、固液比和乙醇体积分数对提取率的影响.通过单因素实验和正交实验确定黑木耳中黄酮类化合物的最佳微波法提取条件为:微波辐射功率560W、微波辐射时间50 s、固液比1∶9(g∶ mL)、乙醇体积分数90％,此时提取率为0.665％.     

Ethanol-Assisted Aqueous Enzymatic Extraction of Peony Seed Oil

An ethanol-assisted aqueous enzymatic extraction was performed for peony seed oil (content of 30%). This method included cooking pretreatment, pectinase hydrolysis, and aqueous ethanol extraction, and the corresponding variables in each step were investigated. The changes in viscosity and dextrose equivalent values of the reaction medium as a function of changing enzymatic hydrolysis time were compared to the oil yield. The microstructures of peony seeds were analyzed using confocal laser scanning microscopy to understand the process of oil release as a result of cooking and grinding. The highest oil yield of 92.06% was obtained when peony seeds were cooked in deionized water with a solid–liquid ratio of 1:5 (w/v) at 110°C for 1 hour, ground to 31.29 μm particle size, treated with 0.15% (w/w) pectinase (temperature 50°C, pH 4.5, time 1 hour), and then extracted with 30% (v/v) aqueous ethanol (temperature 60°C, pH 9.0, time 1 hour). After processing with pectinase followed by ethanol extraction, the residual oil content in water and sediment phase decreased to 5% and 3%, respectively. The quality of the oil obtained by ethanol-assisted aqueous enzymatic extraction was good, complying with the Chinese standard.     

微波法提取升麻中阿魏酸的工艺研究

采用煎煮法、加热回流法及微波法提取升麻中阿魏酸,对其提取工艺进行比较,确定微波法为最佳提取方法.采用单因素实验和正交实验确定微波法提取升麻中阿魏酸的最佳工艺条件为:乙醇体积分数70%、液料比20:1(mL:g)、微波辐射时间90 s、微波辐射功率385 W,在此条件下,阿魏酸提取率可达0.0593%.     

金银花中绿原酸的微波辅助提取工艺研究

采用微波辅助法提取金银花中的绿原酸,研究了乙醇体积分数、料液比、微波功率和微波处理时间对绿原酸提取率的影响.通过单因素实验和正交实验确定最佳提取工艺为:乙醇体积分数60％、料液比1∶ 10(g∶ mL)、微波功率300 W、微波处理时间9 min,在此条件下,绿原酸提取率达3.779％.     

Extraction and Fermentation‐Based Purification of Saponins from Sapindus mukorossi Gaertn.

In the present study, the extraction and purification of saponins from Sapindus mukorossi Gaertn. were examined for effective utilization of the saponin resource. Saponins were extracted from S. mukorossi Gaertn. using water. The conditions of the water extraction process, including extraction temperature, extraction time, number of times of extraction, and solvent‐material ratio were optimized. The yield of total Sapindus saponins (TSS) from the pericarp was 33.41 % and its purity in the extract was 45.71 %. The saponin solution was further concentrated to 1/6–1/7 of its original volume, and dried yeast BV818 that adapted to the concentrated Sapindus saponins solution (SW) was screened. The activation conditions, inoculum amount, fermentation temperature, and fermentation period were optimized. By using the dried yeast under optimized conditions, the purity was increased to 75.50 %. The yield of the byproduct ethanol was 5.33 % (w/v), while the content of TSS in the final product decreased from 18.29 to 15.30 % (w/v). These results could contribute to the development of industrial‐scale production of Sapindus saponins.