共查询到19条相似文献，搜索用时 281 毫秒
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大豆与大豆芽中异黄酮提取工艺研究 总被引：1，自引：0，他引：1
以乙醇为溶剂,分别以大豆、大豆芽为原料,研究了异黄酮的提取工艺,并在最佳工艺条件下探讨了两者中异黄酮的得率,试图寻找提取大豆异黄酮的最佳原料和工艺方法.结果表明温度、乙醇浓度、料液比、提取时间等'因素对异黄酮的提取均产生不同程度的影响,大豆芽中异黄酮含量比大豆中高.通过正交试验得出从大豆、大豆芽中提取异黄酮的最佳工艺条件分别为温度80℃,乙醇浓度70%,料液比120,时间2 h;温度80℃,乙醇浓度70%,料液比114,芽长6 mm,在此条件下异黄酮的提取率分别为1854、2105 μg·g-1. 相似文献
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应用响应面分析法优化莲心黄酮类物质的提取工艺,在单因素试验的基础上,选取乙醇体积分数、料液比、微波提取时间、微波功率4个因素进行Box-Behnken中心组合设计,确定微波提取莲心黄酮类物质的最佳工艺条件为:乙醇体积分数67%,料液比2∶100(g∶mL),微波提取时间70 s,微波功率470 W。与传统微波水提取方法相比,该方法可以提高提取率,缩短提取时间。 相似文献
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以乙醇为溶剂,研究了大豆异黄酮的微波助提工艺.通过单因素和正交试验,得到微波助提的优化参数条件为:80目大豆粉,微波功率240 W、60%乙醇、微波辐射90 s、液同比10:1、提取2次.在此提取条件下大豆异黄酮得率2.72%.与常规浸提相比,微波助提工艺具有省时、节约溶剂、提取得率高等优势. 相似文献
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大豆异黄酮提取工艺优化及其活性研究 总被引：1，自引：0，他引：1
研究大豆异黄酮提取的最佳工艺条件及其活性.在单因素试验和L9(34)正交试验的基础上,确定乙醇-水体系提取大豆异黄酮的最佳工艺条件:乙醇浓度80%,液料比(溶剂∶原料)24∶1,提取温度50℃.对异黄酮分别进行清除自由基和抑菌的活性研究,结果表明:大豆异黄酮有良好的清除羟基自由基和超氧自由基的能力;对金黄色葡萄球菌、大肠杆菌及米根霉的生长有明显的抑制作用. 相似文献
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Effects of microwave irradiation on the basic properties of woodceramics made from carbonized tobacco stems impregnated with phenolic resin 总被引：2，自引：1，他引：1
Wei Li Libo Zhang Jinhui Peng Ning Li Shimin Zhang Shenghui Guo 《Industrial Crops and Products》2008,28(2):143-154
A series of woodceramics derived from carbonized tobacco stems and phenolic resin composite heated by microwave irradiation was prepared and effects of microwave irradiation time, power and mass fraction of phenolic resin in woodceramics on the mass loss ratio, volume shrinkage ratio, apparent density, open porosity and volume electrical resistivity were investigated systematically. The pyrolysis behaviours of tobacco stems, phenolic resin and carbonized tobacco stems/phenolic resin composite were also evaluated using thermogravimetry. The experimental results showed that the mass loss ratio, volume shrinkage ratio and apparent density increased, while the volume electrical resistivity and open porosity decreased with increasing microwave irradiation time. The apparent density increased, while the mass loss ratio, volume shrinkage ratio, volume electrical resistivity and open porosity decreased with an increase in the mass fraction of phenolic resin. The mass loss ratio, volume shrinkage ratio and open porosity increased, while apparent density and volume electrical resistivity decreased with an increase in the microwave power. Microstructures of woodceramics obtained at various microwave irradiation time were characterized by scanning electron microscopy (SEM) technique, which confirmed the results of pyrolysis analyses of samples and effects of microwave irradiation on basic properties of woodceramics prepared. 相似文献
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蚜虫取食和机械损伤对大豆真叶中异黄酮的诱导作用 总被引：1，自引：0，他引：1
采用高效液相色谱法,通过测定大豆真叶异黄酮含量的变化,探讨大豆蚜虫取食和机械损伤与大豆真叶异黄酮含量之间的化学诱导关系。结果表明:蚜虫取食诱导的异黄酮合成反应速度较快,而机械损伤处理诱导的异黄酮合成反应速度相对较慢;蚜虫取食引起大豆真叶内大豆黄素和染料木素苷元含量的同时增加,而机械损伤处理提高黄豆黄素苷元含量却降低了大豆黄素苷元含量;蚜虫取食能在相当长的时间内维持异黄酮含量的增加,而机械损伤处理只能在短时间内引起异黄酮含量的变化。因此,蚜虫取食和机械损伤处理所诱导的异黄酮含量变化的规律不同,蚜虫取食和机械损伤所诱导的大豆抗性不是完全对等的。 相似文献
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采用Box-Behnken响应面试验设计法对玫瑰茄总黄酮超声波-微波协同提取工艺进行优化,研究了乙醇浓度、液固比、提取时间、微波功率、提取次数5个单因素对总黄酮提取量的影响,建立了乙醇浓度、液固比和微波功率的三因素回归模型,并研究其抗氧化活性。结果表明,提取的最佳工艺参数为乙醇浓度40%、液固比50∶1（mL/g）、微波功率250 W、提取时间20 min、超声波功率50 W,在此条件下提取2次,总黄酮提取量为40.2 mg/g。同时以维生素C作对照,研究了玫瑰茄总黄酮粗提物和纯化物的体外抗氧化活性。结果表明,玫瑰茄总黄酮粗提物和纯化物都具有较强的抗氧化活性,能够有效清除O2-?自由基和DPPH自由基,清除能力与浓度呈较明显的量效关系,但抗氧化能力较维生素C弱。 相似文献
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以莲子干品为原料,在单因素试验的基础上,通过正交试验确定了乙醇提取莲子多酚类物质的最佳工艺条件为乙醇浓度90%、液料比1∶10、微波功率300 W、提取时间35 s、提取3次。在此条件下浸提,莲子多酚提取率为7.74 mg·g^-1。 相似文献
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《Industrial Crops and Products》2002,15(1):33-42
Prolamine-rich, water insoluble proteins (zeins) can be extracted from milled maize by vigorous mixing in heated ethanol solutions. Whenever solvent extraction is used process cost considerations require that all the solvent be recovered. Because of the low zein content of maize rinsing extract liquid from the extracted maize particles must be done in a way that minimizes dilution. The solid mass fraction of milled grain slurry that can be pumped is 0.25 or less. Because the mass fraction of zein in maize is only approximately 0.05, the zein mass fraction of a batch extract will be less than 0.015. To increase the zein concentration, a batch extract (liquid and fines) can be repeatedly separated from the extracted solid particles and used to extract fresh milled grain. A series of batch extractions with extract reuse can approach the performance of a continuous counter-current solids/liquid extraction, which would be preferable at a commercial scale. Extract reuse is constrained by losses of liquid with the extracted grain and by reductions of the extracting capacity of the extract due to the increasing solute or fines content. By examining the extract composition and yield of a series of batches, it is possible to estimate the zein concentration that could be achieved in a continuous, countercurrent process and to examine effects of higher zein concentrations on extraction that would be inaccessible with a single batch. The centrifugate concentrations for a series of maize extractions in which the extracted maize and extract solution were cooled prior to centrifugation were analyzed. The data were fit with a model based on a maximum zein concentration in the extract. The fit indicates that the protein content of the liquid centrifugate will not exceed 2% for any series of similar batch extractions, by using centrifugation to separate the maize from the extraction slurry after cooling it to ambient temperature. This contrasts with concentrations of zein of 10% or more achieved by extracting corn gluten using similar conditions. Although the concentration of zein in gluten is higher we believe the concentration difference is mainly due to chemical changes to the zein that take place in the gluten production and the methods used to extract zein from gluten. 相似文献
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为了通过改变豆浆工艺来调控酸浆豆干的品质,分析豆浆制备工艺对酸浆豆干品质的相关影响。以生豆、熟豆、浸泡豆为原料,分别采用磨浆法、粉碎冲浆法制备生浆,制浆水温设置为10,30,50,70,90℃。分别以生浆法、熟浆法制作熟浆,再制作豆干,对酸浆豆干的出品率、水分含量、保水性、蛋白质含量及质构测定。结果表明:在相同处理方式下,生浆法制得豆干出品率、水分含量及保水性均高于熟浆法,磨浆水温为70℃下采用生浆法制作的豆干出品率最高可以达到193.4%。豆干中蛋白质含量随制浆水温的升高而增加,熟浆法所制得豆干中蛋白含量高于生浆法制的豆干,在磨浆水温为90℃下采用熟浆法制作的豆干蛋白质含量最高可以达到22.6%。随制浆水温升高,豆干的胶着性、咀嚼性及回复性有下降趋势。 相似文献