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1.
为优化发酵虫草菌粉多糖的微波辅助提取工艺,在单因素实验基础上,以液固比、微波功率以及提取时间为自变量,多糖提取率为响应值,采用中心组合设计的方法,研究各自变量及其交互作用对多糖提取率的影响。利用SAS软件和响应面分析相结合的方法对发酵虫草菌粉多糖的微波辅助提取工艺进行优化,确定了微波辅助提取多糖的最佳条件:液固比值12.2,微波功率650.5W,提取时间11.8min,在此条件下,多糖提取率达到6.41%。采用此法提取的虫草菌丝体多糖,当质量浓度为1mg/mL时,对二苯代苦味肼基自由基(DPPH)清除率达到76%。  相似文献   

2.
采用响应面优化酶解——微波辅助法从桑叶中提取桑叶多糖的提取工艺。在单因素试验的基础上通过采用Box-Behnken方法,研究液固比、提取时间、提取温度对桑叶多糖提取率的影响。结果显示,拟合方程显著,最终确定桑叶多糖的最优提取条件为:酶含量2%、酶解pH6、酶解温度50℃、酶解时间20 min、液固比15 mL·g-1、提取时间13 min、提取温度76℃,该条件下桑叶多糖的实际提取率为15.23%,与理论模拟值15.12%接近,建立的模型真实可靠。该方法用于提取桑叶中的多糖类成分,工艺简单、成本低,具有有较高的应用价值。  相似文献   

3.
采用微波技术提取桑叶多糖的工艺研究   总被引:1,自引:0,他引:1  
本试验以干燥桑叶粉为材料,在单因素实验的基础上,采用Box-Benhnken中心组合实验和响应面分析法,研究了提取时间、微波功率和料液比对桑叶多糖提取率的影响,确定了微波提取桑叶多糖的最佳工艺条件;与热水浸提法相比,微波法提取率高,且所得桑叶多糖更能明显提高四氧嘧啶糖尿病小鼠的糖耐量,是一种更好的桑叶多糖提取方法。  相似文献   

4.
目的:提高伽师瓜副产物—瓜皮的利用价值。方法:伽师瓜皮为试验材料,经晾晒3d并在烘箱65℃的条件下存放24h,处理后的伽师瓜皮呈薄脆状态时效果较佳。以微波时间、pH值料液比为自变量,分别比较三者对其果胶提取率的影响,应用响应面法进行优化,并验证优化方案。结果:伽师瓜皮果胶的最适提取工艺参数为萃取液pH值为35、料液比1∶40、微波加热时间为70s,此时伽师瓜皮果胶提取率为483%。结论:该工艺可以有效地提取伽师瓜皮中的果胶。  相似文献   

5.
目的:优化微波辅助提取伏毛铁棒锤总生物碱工艺,并比较不同产地伏毛铁棒锤中总生物碱含量。方法:以单因素试验为基础,结合响应面法,以总生物碱的含量为评价指标,考察温度、料液比、时间和体积分数对提取得率的影响。结果:最佳微波辅助提取工艺参数(条件)为:温度48℃,料液比1∶19(g/mL),时间12 min,甲醇体积分数39%。结论:该提取方法稳定可靠,操作简便,可用于优化伏毛铁棒锤总生物碱提取工艺。比较不同地区伏毛铁棒锤中总生物碱含量,贵南县伏毛铁棒锤总生物碱含量最高,为0.290%。  相似文献   

6.
微波辅助提取荷叶总生物碱的工艺研究   总被引:2,自引:1,他引:2  
本文通过采用单因素试验和正交试验考察不同因素对荷叶总生物碱提取量的影响,从而探讨微波辅助提取荷叶中总生物碱的最佳工艺.结果表明:微波辅助提取荷叶总生物碱的最佳条件为:pH 2.5 HCI、微波765W辐照2.5 min、固液比1:40、浸提3 h,荷叶总生物碱提取量为175.95μg/g,与热回流提取6 h、索氏提取10.5h的结果接近.因此微波辅助提取技术应用于荷叶总生物碱的提取,具有省时、高效、节能等优点.  相似文献   

7.
银杏是我国的特有物种,银杏外种皮一直以来都是被作为废弃物被丢弃,本实验通过采用微波辅助的方法提取了外种皮多糖,改进了传统的浸提方法。通过研究微波时间、料液比和提取时间对银杏多糖提取的影响,在单因素轮换法基础上采取响应面法优化实验。结果表明,料液比29,在功率700 W下微波处理13 min,然后在沸水浴中浸提2.75 h,银杏外种皮的收率为13.913%。  相似文献   

8.
本文以金针菇菌渣为原料,在单因素实验的基础上,以微波时间、微波功率和料液比为变量,以金针菇菌渣中多糖得率为响应值,应用响应面分析法,确定了提取工艺的最佳参数:微波时间115 s、微波功率640 W、料液比1∶26。在此条件下金针菇菌渣中多糖得率为7.53%,比热水浸提的多糖得率提高了15.14%。提取得到的多糖具有一定还原力,且对ABTS+自由基和羟基自由基均有一定的清除作用,其IC50值分别为8.40、1.01mg/m L和1.95 mg/m L,证明金针菇菌渣中多糖具有一定的抗氧化活性。  相似文献   

9.
微波辅助提取灰树花多糖工艺研究   总被引:1,自引:0,他引:1  
采用提取时间、微波功率、液料比的单因素试验和正交试验法优化微波辅助提取灰树花多糖条件.结果表明,以净多糖得率为指标,影响微波辅助提取灰树花多糖的主次因素为:提取时间>微波功率>液料比,并且提取时间和微波功率的影响达到了极显著水平.灰树花多糖最佳提取工艺条件为:提取时间为10 min,微波功率为80%(全功率为800 W),液料比为25∶1.创立了一种用苯酚-硫酸法测定多糖时排除蛋白质干扰的方法.  相似文献   

10.
二氢杨梅素和杨梅素是拐枣种子中的重要成分。通过超声辅助法从拐枣种子中提取二氢杨梅素,采用单因素法考察乙醇体积分数、超声辐照功率、提取温度、液料比和超声辐照时间影响参数的基础上,并选用Box-Behnken响应面设计法分析建立了超声辐照功率、超声辐照时间和液料比的二次多项式模型,优化提取工艺。结果得到超声辅助法提取拐枣种子中二氢杨梅素的最佳工艺参数为:乙醇体积分数为60%、超声辐照功率140 W、超声辐照时间30 min、液料比20.5 mL·g-1,提取温度40℃。在此最佳条件下,二氢杨梅素得率为2.14±0.09 mg·g-1。本提取方法简单快速,效率高,有利于拐枣资源的综合加工利用。  相似文献   

11.
  总被引:9,自引:0,他引:9  
The antioxidant activities of the flaxseed lignan secoisolariciresinol diglycoside (SDG) and its mammalian lignan metabolites, enterodiol (ED) and enterolactone (EL), were evaluated in both lipid and aqueous in vitro model systems. All three lignans significantly (p 0.05) inhibited the linoleic acid peroxidation at both 10 and 100 M over a 24-48 h of incubation at 40°C. In a deoxyribose assay, which evaluates the non site-specific and site-specific Fenton reactant-induced ·OH scavenging activity, SDG demonstrated the weakest activity compared to ED and EL at both 10 and 100 M; the greatest ·OH scavenging for ED and EL was observed at 100 M in both assays. The incubation of pBR322 plasmid DNA with Fenton reagents together with SDG, ED or EL showed that the inhibition of DNA scissions was concentration dependent. The greatest non site-specific activity of lignans was at 100 M, thus, confirming the results of the deoxyribose test. In contrast, the protective effect of SDG and EL in the site-specific assay was lost and that of ED was minimal. Therefore, the results indicate a structure-activity difference among the three lignans with respect to specific antioxidant efficacy. All three lignans did not exhibit reducing activity compared to ascorbic acid, therefore, did not possess indirect prooxidant activity related to potential changes in redox state of transition metals. The efficacy of SDG and particularly the mammalian lignans ED and EL to act as antioxidants in lipid and aqueous in vitro model systems, at relatively low concentrations (i.e. 100 M), potentially achievable in vivo, is an evidence of a potential anticarcinogenic mechanism of flaxseed lignan SDG and its mammalian metabolites ED and EL.  相似文献   

12.
Zinc is essential for cell growth. Previous studies have shown that zinc concentration in breast cancer tissues is higher than that in normal breast tissues. Zinc cannot passively diffuse across cell membranes and specific zinc transporter proteins are required. Two gene families have been identified involved in zinc homeostasis. ZnT transporters reduce intracellular zinc while ZIP transporters increase intracellular zinc. In this study, three human zinc transporter members: ZnT-1, ZIP2 and LIV-1 were chosen. We aimed to determine the effect of flaxseed lignan on the growth of ER-negative breast cancer cells in a nude mice model and observe the effect of flaxseed lignan on the regulation of the three zinc transporter in mRNA level. Nude mice were xenografted with human breast cancer cell line MDA-MB-231 and 6 weeks later were fed either the basal diet (BD) or BD supplemented with 10% FS and SDG for 5 weeks. The SDG levels were equivalent to the amounts in the 10% FS. RT-PCR was performed. Compared with the BD group, the tumor growth rate was significantly lower (P < 0. 05) in the FS and SDG group. ZnT-1 mRNA level in mammary tumor was increased in SDG group and decreased in FS group, but no significant difference was found. Extremely low amplification of ZIP2 from mRNA was detected, with no difference between the treatment groups. LIV-1 mRNA expression of SDG group increases compared with BD group. In FS group, it significantly increases nearly 9 times than that in BD group (P < 0. 005).  相似文献   

13.
以木豆根为原料,利用微波辅助提取技术进行提取,在单因素实验的基础上对提取条件进行了考察,根据BBD(Box-Behnken design)实验设计原理,采用3因素3水平的响应面分析法,以木豆根中主要异黄酮染料木素(genistein)为指标,对提取过程进行优化,得到最佳工艺参数为:提取温度为68℃,固液比为32∶1 mL·g-1,乙醇浓度为78%,提取功率700 W,提取时间15 min。在最佳提取条件下染料木素的提取率可达到0.465±0.032 mg·g-1。本研究对于微波提取技术的应用及木豆根的开发和利用都具有显著的意义。  相似文献   

14.
本文在提取苦荞壳中总黄酮的工艺实验中,优化了提取溶剂的种类,水和乙醇,同时还使用了超声波和微波辅助提取,并分别将不同因素,如溶剂种类及浓度,提取时间,温度,pH,液固比等,对提取结果的影响作了比较,结果表明,当介质为乙醇时的微波萃取效果明显优于其他提取方法。  相似文献   

15.
以红曲菌丝体为原料,通过单因素实验及Box-Behnken设计响应曲面分析优化了红曲色素的提取工艺条件。通过实验,得到了提取率的回归方程Y=0.923-0.011X1-0.011X2-0.017X12-0.027X22-0.026X32-0.028X1X2-0.019X1X3,通过对模型解逆矩阵得优化方案:乙醇浓度X1=66%、超声功率X2=200 w、提取温度X3=52℃,模型预测结果为92.5%。在该工艺条件下进行验证实验,提取率达到92.1±0.6%(n=3)。  相似文献   

16.
Mulberry 1-deoxynojirimycin (DNJ, a potent α-glycosidase inhibitor) has therapeutic potency against diabetes mellitus. However, the amount of DNJ in mulberry leaves is low (about 0.1%), and a more effective extraction method is needed. Ultrasound-assisted extraction (UAE) was applied in this study for mulberry DNJ extraction, and five factors, the percentage of ethanol in the extraction solvent (x 1), ratio of the extraction solvent to mulberry sample (x 2), ultrasonic power (x 3), extraction temperature (x 4) and extraction time (x 5), were investigated by fractional factorial 2(5-1) design (FFD) to obtain the optimum extraction efficiency (DNJ yield, Y 1) and extraction productivity (total yield, Y 2). The results showed that x 2, x 3 and x 5 had significant impact on Y 1 and Y 2, and were further optimized by response surface methodology (RSM). Under the optimized conditions (x 2, x 3 and x 5 of 7 ml/g, 180 W and 260 s, respectively), DNJ-enriched powder (0.8%) was produced with high extraction efficiency (98%) and productivity (20%), enabling this product to be used for nutraceutical purposes.  相似文献   

17.
采用超声波辅助水提法提取芦笋多糖,并用响应面法进行工艺条件优化研究.结果表明芦笋多糖得率为4.298%,其最佳工艺条件为提取超声功率250 w,料液比为l:30(g:ml),超声温度为75℃,超声时间为60 min.  相似文献   

18.
以降香黄檀可再生资源——叶子为原料,利用离子液体微波辅助提取技术对鹰嘴豆芽素A和染料木素进行提取。通过单因素实验,3因素3水平的BBD(Box Behnken design)实验,对提取条件进行优化,确定了离子液体微波辅助提取降香檀叶中鹰嘴豆芽素A(biochanin A)和染料木素(genistein)的最佳提取工艺条件:1.00 mol·L-1[C4MIM]Br,提取温度为56℃,液固比18∶1,提取时间为11 min,提取功率300 W。在最佳提取条件下,鹰嘴豆芽素A和染料木素平均提取率分别可达1.598和0.939 mg·g-1。  相似文献   

19.
微波辅助提取龙葵中总生物碱的研究   总被引:14,自引:3,他引:14  
本文对龙葵中总生物碱(Tocal steroidal alkaloids,)的微波辅助提取(Microwave-assisted extraction,MAE)工艺、作用机理及对成分的结构影响进行了系统的研究。以酸性染料比色法为分析手段,设计正交试验得到了最佳提取工艺:以95%乙醇为溶剂,料液比1:20,在585w下提取8min;用扫描电镜(SEM)对样品处理前后形貌进行了观察,揭示了微波作用机理与细胞结构变化有关。同时薄层色谱(TLC)、反相高效液相色谱(RP-HPLC)定性分析显示,微波对有效成分的结构没有造成影响。  相似文献   

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