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研究了黄豆分别在东湖陈醋和东湖白醋中长达31d的浸渍过程中可溶性蛋白质、多肽、多酚含量及其抗氧化性的变化。主要研究结果显示,黄豆在醋浸过程中,可溶性蛋白质含量显著降低,其中,白醋浸泡的黄豆中蛋白质含量下降了76.4%,陈醋浸泡的黄豆中蛋白质含量下降了56.7%,多肽含量总体呈增长趋势;陈醋浸豆的多酚含量及总黄酮含量随浸泡时间逐步增大,而白醋浸豆则维持在一个相对稳定的水平;抗氧化活性方面,随着浸泡时间增加,样品相同浓度的多酚提取物羟基自由基清除率下降,而DPPH、ABTS自由基的清除能力呈上升趋势。采用陈醋浸泡黄豆在多酚及总黄酮含量及DPPH自由基清除率方面都优于白醋。 相似文献
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《云南化工》2018,(11)
对2017-2018年贵州省食醋微生物抽检结果进行分析统计,从原料、工艺、酸度、包装规格四个角度考察食醋中微生物相关性和风险性。样品包括国家监督抽查191批次,客户委托送检98批次,合计289批次。按照GB 18187-2000、SB/T 10337-2012、GB 2719-2003、GB 4789.2-2016、GB/T 4789.3-2003对食醋中菌落总数和大肠菌群进行检测并对结果进行分析统计。不同原料、工艺、酸度和不同包装规格菌落总数χ2分别p0.05,p0.05,p0.05,和p0.05;所有食醋大肠菌群合格率100%。原料、工艺、酸度不同,菌落总数无显著差异,包装规格不同,菌落总数有显著性差异。陈醋、香醋、固态发酵食醋、总酸值在3.50~4.50 g/100 mL的食醋、瓶装食醋菌落总数不合格风险率较高。 相似文献
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人工湿地填料对氮磷的静态吸附筛选实验 总被引:5,自引:0,他引:5
通过考察填料对水中氮磷的吸附性能,为人工湿地填料的选择提供依据。在水中投加一定量填料,在不同条件下进行磁力搅拌,测定填料对氮磷的吸附性能。结果表明填料粒径为8~12目,固液比50 mg/L,搅拌速率300 r/min,搅拌时间3 h,原水pH约为6.5,氨氮的初始质量浓度30 mg/L左右、磷的初始质量浓度3 mg/L左右时,煤灰渣对氨氮的去除率6.6%,对磷的去除率30%;沸石对氨氮的去除率40%,对磷的去除率22.8%;蛭石对氨氮的去除率28.5%,对磷的去除率9%。pH对氮磷吸附的影响较大,原水在碱性和中性的条件下,对氮磷的吸附性能要优于酸性条件。 相似文献
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由于从小就喜欢游山玩水,对山水有种情有独钟的感觉。在景德镇这块艺术沃土里,我也开始学习陶瓷山水的绘画。初始老师教我们的是构图,告诉我们构图的重要性,这里我就想谈谈个人对山水构图的理解。通过这几年对新彩山水画的学习,对山水画的构图有一定的了解,认识到构图对一幅山水画关系很大,要能够充分运用构图的方法,使画面的布局十分合理,首先应该了解中国画家对自然山水的观察 相似文献
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Sand–bentonite mixtures are planned for use as backfill materials for high-level nuclear waste disposal in Japanese project. Sand–bentonite mixtures are attracting greater attention as backfill materials because they offer properties of very low permeability and high swelling. We must investigate the hydraulic properties by experiments and evaluate quantitatively the hydraulic-conductivities of sand–bentonite mixtures to design specifications, such as dry density and bentonite content, of backfill materials.For that purpose, this study investigated hydraulic conductivities at different bentonite contents and dry densities by experimentation. In addition, we discussed the relationship between hydraulic conductivity and bentonite content from the viewpoint of bentonite swelling in backfill voids. Furthermore, this study proposed simplified evaluation for hydraulic conductivity using a parameter proposed by the author: swelling volumetric strain of montmorillonite. This evaluation method can obtain hydraulic conductivity of backfill materials at various dry densities and bentonite contents. Therefore, this evaluation method can be used for designing bentonite content and compaction density to achieve very low permeability. 相似文献
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使用新的交联剂合成一种新型可自降解的高吸水性复合树脂.以过硫酸铵为引发剂,柱撑膨润土层间的多羟基聚合铝阳离子为交联剂,膨润土、丙烯酸和丙烯酰胺为主要原料,采用水溶液共聚法合成高吸水性复合树脂.采用XRD测试法研究了膨润土的柱撑效果;通过研究高吸水性复合树脂吸去离子水和0.9%NaCl溶液的倍数探讨了柱撑膨润土和引发剂的最佳用量;通过观察高吸水性复合树脂吸水凝胶的状态初步探讨了复合树脂凝胶的自降解情况.结果表明:多羟基聚合铝阳离子被引入膨润土的层间,柱撑效果很好;柱撑膨润土和引发剂的最佳用量分别为单体总质量的2.4%,0.34%;所制备的高吸水性复合树脂比其他的高吸水树脂的自降解性好,在65℃下25天就已完全降解. 相似文献
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The adsorption of two acid dyes, namely, Red Bezanyl and Green Nylomine, onto natural bentonite and acid activated bentonite from aqueous solutions were studied in a batch system. The kinetic data show that at the equilibrium, the acid-activated bentonite fixes more Bezanyl Red and Nylomine Green than the natural bentonite. Adsorption equilibrium was reached within 2 h. The results also showed that the kinetics of adsorption is best descibed by a pseudo second-order expression than a first or second-order model. Adsorption isotherms of acid dyes onto bentonite and acid-activated bentonite were determined and correlated with common isotherm equations such as the Langmuir and Freundlich models. The Langmuir model agrees very well with the experimental data. For better explanation of these results, the natural bentonite and acid-activated bentonite have been examined in detail through FTIR, BET and XRD analyses. 相似文献
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精制处理前后竹醋液组分及其含量的分析 总被引:6,自引:0,他引:6
以自燃炉生产的竹醋液原液及其精制竹醋液为研究对象,比较两者在基本理化性质及其有机物组分和各组分含量的差异.结果表明,在基本理化性质方面,精制竹醋液较竹醋液原液更加透明,其色泽淡黄接近无色;竹醋液原液的折光率、总酸含量分别较精制竹醋液高出144%和22%;竹醋液原液的密度、pH值也高于精制竹醋液.利用气-质联用仪进行成分分析,结果表明竹醋液原液由97种有机物组成,精制竹醋液有94种有机物组成;精制竹醋液的有机酸含量比竹醋液原液高84%,为63.44%;而竹醋液原液的酚类、醛类、酮类、酯类分别比精制竹醋液高44.6%、10.6%、9.8%、116%,且醇类和其它有机物含量远高于精制竹醋液. 相似文献
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几种秸秆醋液组分中活性物质的分析 总被引:3,自引:0,他引:3
以农作物秸秆(棉秆、稻秆、麦秆和玉米秆)为主要原料制备秸秆醋液,研究了在种炭化温度450、600和750℃下,棉秆醋液、稻秆醋液、麦秆醋液、玉米秆醋液的得率.研究表明秸秆醋液的得率随着炭化温度的升高而增加,当炭化温度为750℃时,醋液得率分别为棉秆醋液51.70%、玉米秆醋液45.2%、稻秆醋液4.91%、麦秆醋液42.44%.采用气-质联用仪进行秸秆醋液成分的分析,表明秸秆醋液是一种组分复杂的混合物,4种秸秆醋液平均含有24.41%酚类、22.09%的酮类、20.79%的有机酸、4.52%的醛类、4.20%的醇类及2.44%的酯类等.秸秆醋液中所含的乙酸、丙酸、苯酚、甲酚、甲氧基酚、乙醇等成分均为有效的活性物质,具有抑菌、杀菌的作用. 相似文献
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以自燃炉生产的竹醋液原液及其精制竹醋液为研究对象,比较两者在基本理化性质及其有机物组分和各组分含量的差异。结果表明,在基本理化性质方面,精制竹醋液较竹醋液原液更加透明,其色泽淡黄接近无色;竹醋液原液的折光率、总酸含量分别较精制竹醋液高出144%和22%;竹醋液原液的密度、pH值也高于精制竹醋液。利用气-质联用仪进行成分分析,结果表明竹醋液原液由97种有机物组成,精制竹醋液有94种有机物组成;精制竹醋液的有机酸含量比竹醋液原液高84%,为63.44%;而竹醋液原液的酚类、醛类、酮类、酯类分别比精制竹醋液高44.6%、10.6%、9.8%、116%,且醇类和其它有机物含量远高于精制竹醋液。 相似文献
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《Applied Clay Science》2010,48(3-4):330-342
In saturated bentonite, free water is hosted in the meso- and macropores. Microscopic characterization of free water and the associated pore structure is very difficult because of the swelling- and shrinking-behaviour of montmorillonite. In this article, we present state of the art cryo-preparation techniques including high pressure freezing and low temperature freeze substitution, which enable the stabilization of bentonite microstructures. Microscopic analyses of cryo-stabilized bentonite samples are then performed with conventional SEM, with cryo-SEM and with FIB-nanotomography. From the resulting 2D- and 3D-images, so-called “continuous pore size distributions” are calculated and the 3D-connectivities of the mesopores are documented. Furthermore, from the comparison with pore size analyses that are based on conventional preparation techniques (oven drying and freeze drying), it is shown that high pressure freezing leads to more reliable results. Overall, it is demonstrated that reliable quantitative 3D-characterization can be achieved from the bentonite pore structure when high resolution 3D-imaging by FIB-nanotomography is combined with modern cryo-preparation techniques (i.e. high pressure freezing). 相似文献
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有机小分子季铵盐插层蒙脱石的制备综述 总被引:1,自引:0,他引:1
膨润土是一种很重要的非金属矿物,我国膨润土矿资源十分丰富,储量仅次于美国居世界第二位。本文介绍了有机膨润土的制备原理,制备工艺及制备过程中的关键因素。 相似文献