正交法优化槐米中芦丁的提取工艺

以槐米中芦丁的提取含量为评价指标,以粉碎度、溶剂的用量、提取时间和提取次数为考查因素,采用正交实验优选最佳的提取工艺条件。结果表明:芦丁药材粉碎为粗粉,加入20倍量的溶剂,提取2次,每次提取20min,提取率较高。结论:该提取工艺成本较低,操作简单安全,适用于大规模生产。     

超声条件下碱提取酸沉淀法从槐米中提取芦丁的研究

以新鲜的槐米为原料,65℃下充分干燥,研细后采用超声条件下碱石灰煮沸盐酸酸化沉淀法来提取芦丁。探讨了反应温度、反应液的pH值、溶剂用量及反应时间对产物芦丁提取率的影响。得出提取的最佳条件为:控制反应温度为70~75℃,碱提取时pH=9、酸沉淀时pH=4,溶剂用量以6倍于原料为宜,提取3次,反应时间3.5 h。制得的芦丁为浅黄色针状晶体,提取率17.83%,熔点176~178℃。     

蜀葵子生药学检测与芦丁、山奈素和槲皮素的含量测定

依据《中国药典》(2015版)对蜀葵子进行生药学检测,并新建了蜀葵子中芦丁、山奈素和槲皮素的薄层色谱和高效液相色谱检测方法。结果表明,对比10批蜀葵子药材,其横切面有木栓层细胞数列,4～7束维管束排列成环带,外被大量非腺毛;10批蜀葵子中芦丁、山奈素和槲皮素的R_f值均与标准品一致,且斑点清晰。蜀葵子中芦丁、山奈素和槲皮素的平均含量分别为0.617 mg·g~(-1)、0.034 mg·g~(-1)和0.033 mg·g~(-1);线性范围分别为2.55～206.67μg·mL~(-1)(R=0.9993)、2.38～199.33μg·mL~(-1)(R=0.9994)和2.88～233.33μg·mL~(-1)(R=0.9997);精密度RSD(n=6)分别为0.263%、0.290%、0.405%;平均加标回收率分别为99.86%(RSD=1.83%)、100.72%(RSD=2.03%)和105.91%(RSD=1.87%)。为蜀葵子药材质量控制标准提升奠定了基础。     

芦丁水解制备槲皮素的实验条件比较研究

为了寻找芦丁水解制备槲皮素的最佳实验条件,为槲皮素的生产提供实验数据,采用在不同溶液中,使用不同的酸,不同浓度,加热不同的时间,观察芦丁水解的情况。实验发现：芦丁在水溶液中,使用盐酸或硫酸,酸的浓度在0．5％时,芦丁水解制备槲皮素的生产成本最低、收率高、综合效益最好。实验结果表明：在0．5％的盐酸或硫酸水溶液中,加热1h,芦丁水解制备槲皮素的收率为91．0％。     

超声辐射提取槐花米中的芦丁

利用超声辐射改进了从槐花米中提取芦丁的方法，本法较之现有的方法具有提取时间短、提取率较高及提取温度较低的特点。     

T型关联度分析法优化芦丁提取纯化工艺

优化芦丁提取纯化工艺。用T型关联度对芦丁提取纯化工艺进行了研究。根据芦丁得率的关联度结果,各因素相关度大小为：X3〉X4〉X6〉X5〉X2〉X1,最佳工艺为95℃下杀酶40min,除胶水温度90℃,除胶水量（V／w）,渗漉pH11．0,酸沉pH3～4,收率22．3％,含量94．2％。可将T型关联度分析法用于芦丁提取纯化工艺为工业化生产提供实验依据。     

高效液相色谱法测定山楂中芦丁和槲皮素的含量

建立了山楂中总黄酮有效成分的含量测定方法。用C18柱为色谱柱,甲醇∶水∶甲酸=50∶48∶2为流动相,检测波长为360nm,按外标法定量。结论:该方法科学、简便、精密度高,结果准确可靠。     

绿原酸和芦丁的提取工艺研究进展

综述了杜仲中绿原酸和芦丁的提取研究进展。重点介绍了绿原酸和芦丁的溶剂提取、物理强化提取、离子液体提取等方面研究,并展望了其提取工艺的发展趋势和应用潜能。     

纸色谱和柱色谱实验方法的改良

对纸色谱和柱色谱实验的方法进行了改良,改良后的实验具有操作方便、现象明显、实验时间短、经济、环保的优点。     

槐花米中芦丁的提取

主要研究了从槐花米中提取芦丁的几种方法。通过对比，得出“乙醇回流法”是较理想的提取方法。     

One Step Large-Scale Separation and Purification of Rutin from Boenninghausenia sessilicarpa by Countercurrent Chromatography

In this study, a preparative countercurrent chromatography (CCC) method for isolation and purification of the bioactive component rutin directly from the ethanol extract of Boenninghausenia sessilicarpa was successfully established by using n-butanol-ethyl acetate-water as the two-phase solvent system. The upper phase of n-butanol-ethyl acetate-water (4:1:5, v/v) was used as the stationary phase of CCC. Under the optimum conditions, 112 mg of rutin at 98.6% purity was obtained from 2.0 g of the crude extract in a single CCC separation. The peak fraction of CCC was identified by negative ESI, ¹H NMR, and ¹³C NMR.     

微柱高效液相色谱法测定苦荞中芦丁的研究

研究了用微柱高效液相色谱法测定苦荞中芦丁的方法。苦荞中的芦丁用 80 %甲醇加热回流提取 ,以WatersXterraTMRP1 8( 1.0× 5 0mm ,2 .5 μm)色谱柱为固定相 ,1%的醋酸和甲醇为流动相 ,在该色谱条件下 ,苦荞中主要的芦丁在 1.0min内可达到基线分离 ,用紫外二极管矩阵检测器检测 ,方法可用于苦荞中的芦丁的测定 ,结果满意。     

反相色谱法测定银杏叶中的芦丁

采用反相高效液相色谱法测定银杏叶中芦丁的含量。样品经乙醇回流提取、浓缩后,用Eclipse SB-C18(5μm,4.6mm×150mm)色谱柱分离样品,在检测器波长360nm,甲醇∶1.5%醋酸(体积比40∶60)为流动相,流速0.8mL/min,柱温30℃的条件下测定。该方法分离效果好,线性相关系数r=0.99987,平均回收率为98.69%,相对标准偏差为7.8%(n=5)。     

Intramolecular Excited-State Hydrogen Transfer in Rutin and Quercetin

Steady-state and time-resolved optical spectroscopy techniques were employed to study the excited-state intramolecular hydrogen transfer (ESIHT) in rutin, a flavonol that contains a disaccharide and is a natural product in plants. The results are compared with those of a similar natural compound, quercetin, which also has a flavonol structure. The fluorescence decay signal of the normal form of these two compounds is composed of three time components. The ESIHT rate in both compounds has a time constant of 70 fs or less. The ESIHT processes of both compounds show a distinctive kinetic isotope effect of 1.5 or more. The intermediate and long-time components are about 300 fs and a few picoseconds, respectively, for both compounds. The amplitude of the intermediate component in rutin is twice that of quercetin. We explain this difference as arising from the hydrogen bonding of the glucose in rutin to the ESIHT active site.     

胶原纤维吸附剂分离芦丁和槲皮素

以戊二醛交联的胶原纤维为吸附剂,研究其对芦丁和槲皮素的吸附分离特性。结果表明,在乙醇中,胶原纤维吸附剂对芦丁和槲皮素的吸附以氢键作用为主;在水中,吸附作用以疏水键为主。采用 90% 乙醇水溶液和 70% 乙醇水溶液进行分步洗脱,芦丁和槲皮素能够得到分离,回收率分别为 96.70% 和 101.47%。胶原纤维吸附剂具有良好的重复使用特性,在5次重复分离实验中,其分离性能无明显降低。因此,戊二醛交联胶原纤维吸附剂可以用于芦丁和槲皮素混合物的分离。     

胶原纤维吸附剂分离芦丁和槲皮素

以戊二醛交联的胶原纤维为吸附剂,研究其对芦丁和槲皮素的吸附分离特性。结果表明,在乙醇中,胶原纤维吸附剂对芦丁和槲皮素的吸附以氢键作用为主;在水中,吸附作用以疏水键为主。采用90%乙醇水溶液和70%乙醇水溶液进行分步洗脱,芦丁和槲皮素能够得到分离,回收率分别为96.70%和101.47%。胶原纤维吸附剂具有良好的重复使用特性,在5次重复分离实验中,其分离性能无明显降低。因此,戊二醛交联胶原纤维吸附剂可以用于芦丁和槲皮素混合物的分离。     

Separation and Purification of Rosmarinic Acid and Rutin from Glechoma hederacea L. using High-Speed Counter-Current Chromatography

Rosmarinic acid and rutin were successfully separated from Glechoma hederaceaL. using high-speed counter-current chromatography for the first time. Eleven milligrams of rosmarinic acid (chromatographic purity 97.2 %) and 10 mg of rutin (chromatographic purity 98.1 %) were obtained from 100 mg ethyl acetate extract and 100 mg n -butanol extract of Glechoma hederacea L., respectively, with the separation procedure less than 2 h. Their structures were characterized by UV, MS, and NMR. The established methods were simple, fast, and convenient, which can be applied to the preparation of reference substances of rosmarinic acid and rutin.     

Impact of Rutin and Other Phenolic Substances on the Digestibility of Buckwheat Grain Metabolites

Tartary buckwheat (Fagopyrum tataricum Gaertn.) is grown in eastern and central Asia (the Himalayan regions of China, Nepal, Bhutan and India) and in central and eastern Europe (Luxemburg, Germany, Slovenia and Bosnia and Herzegovina). It is known for its high concentration of rutin and other phenolic metabolites. Besides the grain, the other aboveground parts of Tartary buckwheat contain rutin as well. After the mixing of the milled buckwheat products with water, the flavonoid quercetin is obtained in the flour–water mixture, a result of rutin degradation by rutinosidase. Heating by hot water or steam inactivates the rutin-degrading enzymes in buckwheat flour and dough. The low buckwheat protein digestibility is due to the high content of phenolic substances. Phenolic compounds have low absorption after food intake, so, after ingestion, they remain for some time in the gastrointestinal tract. They can act in an inhibitory manner on enzymes, degrading proteins and other food constituents. In common and Tartary buckwheat, the rutin and quercetin complexation with protein and starch molecules has an impact on the in vitro digestibility and the appearance of resistant starch and slowly digestible proteins. Slowly digestible starch and proteins are important for the functional and health-promoting properties of buckwheat products.