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银杏叶聚戊烯醇含量分析研究 总被引:1,自引:0,他引:1
银杏叶中含有黄酮苷、萜内酯和聚戊烯醇等生物活性物质 ,目前仅利用了黄酮甙和萜内酯 ,而聚戊烯醇作为废物未加利用。本研究对银杏叶中聚戊烯醇的含量进行了分析 ,结果表明 :不同树龄、不同地区和不同月份银杏叶中聚戊烯醇存在较大差异 ,含量在 0 1.5 %。同时期采集的银杏叶 ,35a幼树叶中聚戊烯醇的含量明显高于 2 0a以上老树叶 ;幼树采集的最佳时期在 9月份 ,老树的采集时期在 11月份。银杏叶聚戊烯醇为脂类油状物 ,具有免疫、护肝、抗病毒、降血脂、抗肿瘤和辅助化、放疗的作用 ,可开发功能食品和药品 相似文献
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银杏叶聚戊烯醇含量分析研究 总被引:5,自引:0,他引:5
银杏叶中含有黄酮苷、萜内酯和聚戊烯醇等生物活性物质,目前仅利用了黄酮甙和萜内酯,矣戊烯醇作为废物未加利用。本研究对银杏叶中聚戊烯醇的含量进行了分析,结果表明,不同树龄,不同地区和不同月份银杏叶中聚戊烯醇存在较大差异,含量在0-1.5%。同时期采集的银杏叶,3-5a幼树叶中聚戊烯醇的含量明显高于20a以上老树叶;幼树采集的最佳时期在9月份,老树的采集时期在11月份,银杏叶聚戊烯醇为脂类油状物,具有免疫,护肝,抗病毒,降血脂,抗肿瘤和辅助化,放疗的作用,可开发功能食品和药品。 相似文献
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舒血宁注射剂是银杏叶提取物制成的灭菌水溶液。采用高效液相色谱(HPLC)法对舒血宁注射剂进行定性定量分析,同时在2020年版的中国药典基础上利用指纹图谱技术优化舒血宁注射剂的指纹图谱。结果表明,舒血宁注射剂中含有黄酮、萜内酯、儿茶素、表儿茶素、葛根素、圣草酚、香叶木素、大麦芽碱、芫花素、芝麻素、β-谷甾醇、绿原酸、莽草酸、木犀草素等活性成分,结果显示:6批次注射用银杏叶提取物中结构明确的活性成分含量之和均大于总固体量的60%;在2020年版药典测定银杏叶提取物指纹图谱方法基础上,舒血宁注射剂指纹图谱中定位到了6个新化合物,分别是儿茶素、表儿茶素、葛根素、香叶木素、绿原酸及莽草酸。本研究验证了舒血宁注射剂的组成成分非常复杂。 相似文献
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用双相深共熔溶剂(TP-DES)体系同时提取分离银杏果外种皮中亲水性成分萜内酯、黄酮、原花青素和疏水性成分银杏酚酸,分别利用EOPO(环氧乙烷-环氧丙烷共聚物)和大孔树脂对TP-DES中的亲水性和疏水性活性成分进行回收。萜内酯、黄酮和原花青素用分光光度法测定,银杏酚酸用HPLC测定,并根据回收过程中每一步的活性成分含量计算回收率。相对分子质量(简称分子量)为2650,质量分数为90%的EOPO进行回收萜内酯、黄酮和原花青素的回收率分别可达89.44%、53.27%和29.77%; HYA502B树脂静态吸附-解吸回收银杏酚酸回收率可达93.33%。 相似文献
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银杏叶生物活性物质及其标准研究现状 总被引:2,自引:0,他引:2
对银杏叶及其提取的中黄酮、萜内酯、聚戊烯醇及银杏酚类化合物等生物活性成分、功效及其质量标准等现状进行综合性的分析。由于国内尚水建立银杏叶及其提取物的统一质量标准,本文针对目前存在的问题,提出建立银杏叶生物活性物质标准体系的新思路。 相似文献
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银杏叶中四种银杏内酯的含量测定 总被引:3,自引:0,他引:3
建立HPLC-ELSD法测定了30批银杏叶中4种银杏内酯的含量,并对所得数据进行分析研究.色谱条件为:phenonoonon C18色谱柱(250 mm×4.6 mm,5 μm),35%(体积分数)甲醇为流动相,1.000 mL/min的流速,ELSD检测器漂移管温度为60 ℃,氮气压力为1.72×105 Pa.得出红土栽培,未嫁接,树龄6~7 a的银杏叶中银杏内酯含量较高;4种银杏内酯总量集中在0.3%~0.5%(质量分数).该方法准确,重现性好,适用于银杏叶中4种银杏内酯的含量测定;银杏内酯的含量受生长环境影响差别较大,影响因素有待深入研究. 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献