共查询到20条相似文献,搜索用时 125 毫秒
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以干燥菊花为原料,以菊花中总黄酮提取率为指标,在单因素实验基础上,采用微波辅助提取菊花中总黄酮,确定菊花中总黄酮提取的最佳工艺条件,并对提取工艺进行了优化。结果表明微波辅助提取最佳工艺条件为:乙醇质量分数70%,料液比1∶30,微波辐射时间2 min,辐射温度60℃,此时总黄酮提取率为8.479%。 相似文献
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以蒙古黄芪为试验材料,研究纤维素酶解辅助乙醇提取黄芪总黄酮的工艺条件。考察了酶添加量、酶解时间、液固比、乙醇浓度、提取时间、提取温度6个单因素对黄芪总黄酮提取率的影响,在单因素试验的基础上,选择四因素四水平进行正交试验优化工艺参数。结果表明:蒙古黄芪在纤维素酶添加量7.5μL/g,pH值4.0,温度55℃,酶解预处理1.5h后,液固比对黄芪总黄酮提取率影响显著,其次是提取时间和乙醇浓度,提取温度对黄芪总黄酮提取率的影响相对较小。在液固比30mL/g,乙醇浓度90%,提取温度75℃,提取时间2.5h的最优工艺条件下,黄芪总黄酮的提取率为0.57%。与传统醇提法(0.39%)相比,黄芪总黄酮提取率提高了46.15%。 相似文献
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以菊花为原料,采用超声波辅助提取菊花中总黄酮。在单因素实验基础上,对提取工艺进行了正交实验优化。结果表明:超声提取菊花黄酮的最佳工艺条件为:提取时间30 min、料液比1∶15、乙醇浓度60%、提取温度60℃。在此最佳提取工艺条件下,超声波辅助提取菊花中总黄酮的提取率为10.93%。 相似文献
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世界油料、油脂供需及贸易格局分析 总被引:1,自引:0,他引:1
总结近几年世界油料、油脂生产、消费以及贸易格局变动特征,分析了大豆、油菜籽、花生、棕榈油、大豆油、菜籽油及葵花籽油的主产国和需求国之间供需贸易情况,以及未来世界油脂市场供求贸易关系的演变趋势。分析表明:未来发展中国家对油料、油脂市场的影响日趋显著;从全球视角来看,油料主要供给国之间以及主要需求国之间存在相互竞争关系,具体表现为供给国供应能力和需求国购买力相互间的权衡。 相似文献
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D'Arco G Blasi F Cossignani L Di Giacomo F Ciavardelli D Ventura F Scipioni S Simonetti MS Damiani P 《Journal of the science of food and agriculture》2012,92(4):952-959
BACKGROUND: Rabbit meat has excellent nutritive properties. The purpose of this study was to characterize rabbit meat and offal; in particular, the lipid fraction was studied in order to evaluate total and positional fatty acid (FA) compositions of triacylglycerol (TAG) and phosphatidylcholine (PC) fractions. Eight samples of weaned and eight of fattened rabbits were considered. RESULTS: Fattened rabbit meat contained slightly higher protein percentage content (P < 0.05) in comparison to weaned (20.1% versus 18.0%). Calcium content was higher in meat than in offal, unlike sodium, iron, zinc, manganese and copper. The cholesterol content in offal was much higher than in meat. FA profiles of total lipid showed a high percentage of unsaturated fatty acids and an n‐6/n‐3 ratio of 10.3 for fattened rabbit meat. Stereospecific analysis of TAG and PC was carried out on an eight‐sample pool of each meat and offal from weaned and fattened rabbits. In all samples the sn‐2‐position was prevalently esterified with oleic and linoleic acids in TAG, with polyunsaturated fatty acids in PC. CONCLUSION: Lipids from rabbit meat presented higher content of monounsaturated FA and lower n‐6/n‐3 ratio in comparison to offal, which was characterized by higher cholesterol and mineral levels. Copyright © 2011 Society of Chemical Industry 相似文献
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通过对兔毛纤维进行改性处理改善其可纺性,并与羊毛、氨纶和其他原料等混合,采用半精纺和精梳工艺相结合生产羊兔毛精梳弹力纱,生产出羊兔毛精梳弹力织物。根据兔毛纤维的特点,为了达到理想的针梳效果,对针梳机设备作了改进,使纱线的质量和条干均匀度良好。通过对原料的选择、混纺比的确定、纺纱、织造、后整理等一整套工艺路线和技术参数的选择,研制的羊兔毛精纺弹力织物外观华贵,手感柔软滑糯,具有独特风格。 相似文献
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野杂种猪肉品质特性研究及应用进展 总被引:3,自引:0,他引:3
本文综述了野杂种猪肉品质特性的研究及利用状况,分析了大面积推广应用野杂种猪可能出现的风险,并提出了开展野杂种猪肉品质特性选育的方向。 相似文献
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蔬菜抗氧化能力及与酚酸和总黄酮相关性研究 总被引:1,自引:0,他引:1
分析常见蔬菜总抗氧化活性,探讨蔬菜抗氧化能力与酚酸、总黄酮的相关性。采用ABTS、DPPH与FRAP法测定10种常见蔬菜的抗氧化能力,采用Folin-Ciocalteu法测总酚酸,硝酸铝-亚硝酸钠-氢氧化钠法测总黄酮,采用matlab软件进行拟合抗氧化与酚酸、总黄酮的函数方程。结果表明:抗氧化活性与主要抗氧化物质(酚酸和黄酮)的函数关系为Z=-137.743 2-0.918 2 X2+0.211 2Y2-0.422 9 XY+52.843 5 X+2.229 9Y。当总黄酮在6~26mg/100g时,总黄酮、酚酸的量对总抗氧化活性有促进作用;而在27~54mg/100g范围内,总黄酮和酚酸的含量对总抗氧化能力具有一定的抑制作用。 相似文献
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Tetrahydrocurcumin (THC, 1) and zingerone (2) are biologically active molecules originating from the important spices turmeric and ginger, respectively. Novel quinoline derivatives of THC and zingerone have been synthesised by an efficient protocol involving their reaction with substituted 2-aminobenzophenones and 2-aminoacetophenone. Radical-scavenging activities (RSA) of THC, zingerone and their quinoline derivatives were evaluated. The amino-substituted quinoline derivative of THC, 1e, showed antioxidant activity superior to those of 1 and 1a. Derivatives 1b, 1c, 1d and 1f exhibited relatively lower RSA at equimolar concentrations (∼50–55 μmol). A similar trend was also seen in zingerone (2) and its derivatives (2a–2e), with 2e displaying the best RSA. Derivatives of THC (1a–1f) showed stronger antimicrobial activity than THC (1) against Staphylococcus aureus, Bacillus cereus, Escherichia coli, and Yersinia enterocolitica. Also, derivatives of zingerone (2b–2e) exhibited lower minimum inhibitory concentrations (MIC) values than zingerone (2) and its derivative, 2a for both Gram-positive and Gram-negative bacteria. The molecules may have potential pharmacological applications. 相似文献