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建立了气相色谱法测定黑骨藤伸筋透骨喷雾剂中薄荷脑含量。使用HP5890A气相色谱仪:FID氢火焰检测器,HP3396A色谱工作站,DB WAX(PEG 20M)15m×0.53mm×0.25um弹性石英毛细管色谱柱;载气:高纯氮,载气流速为12mL·min~(-1);进样口160℃,柱温:90℃(3min,20℃/min)-120℃(3min,10℃/min)-140℃(2min);检测器温度200℃。薄荷脑标准曲线为Y=1.029X-0.0044;本法RSD均<1.5%;相当于样品中薄荷脑含量50%、100%、200%宽范围内的平均加标回收率分别为103.4%,98.82%,99.34%。本方法快速简便准确,可以用于黑骨藤伸筋透骨喷雾剂中薄荷脑含量的测定和产品质量控制。 相似文献
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<正> 薄荷脑是一种重要的香料和医药原料。天然薄荷脑是从薄荷油中提取的左旋薄荷醇结晶。它具有清凉、镇痛、止痒、杀菌作用,在日用化妆品、清凉饮料、卷烟、医药等方面早已得到广泛的应用。由于天然薄荷脑的生产易受天时影响,产量时有波动,故国外对利用石油化工原料来合成薄荷脑的研究工作颇为重视。但是合成的薄荷脑大都为消旋体,其药用疗效和凉味均不及天然的主旋体,还不能与左旋薄荷脑媲美。虽然,近些年来有报导可以利用立体 相似文献
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最近作者从第十届国际香料精油会议获悉:日本高砂香料公司已经在1984年4月成功地通过一种不对称合成方法工业化制造1-薄荷脑及其他单萜类香料。众所周知,天然1-薄荷脑主要生产国是中国,它是从天然薄荷Menthahaplocalyx 相似文献
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目的建立红色正金软膏中薄荷脑含量测定的方法。方法采用气相色谱法测定红色正金软膏中薄荷脑的含量,色谱条件:HP-INNOWAX(0.25 mm×30 m,0.25μm)色谱柱;进样口温度250.0℃;初始柱温110.0℃,恒温5.0 min,以20.0℃/min升温至220.0℃,恒温4.0 min;载气为高纯氮气;FID检测器(280.0℃);分流比为10.0。结果薄荷脑在浓度0.005~0.030 g/m L范围内有良好的线性关系(R2=0.9999),重复性试验的RSD为0.309%,精密度试验的RSD为0.608%,稳定性试验的RSD为1.430%,加样回收率为99.16%~101.47%,RSD=0.897%。结论气相色谱法测定红色正金软膏中薄荷脑含量快速、简便、准确。 相似文献
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SCM公司过去在合成左旋薄荷脑方面,有很大成就,一度年产300吨,后因生成之消旋脑拆分问题及薄荷脑前几年市价低落,故已停产。他们声称,只要中国脑,继续缺供(83/84年,我国薄荷脑在国际市场缺供),市场一直挺坚下去,他们立即可恢复生产。据KANE博士介绍,他们现在是从β-水芹烯(制自松节油)为原料来生产:並声称不需经过拆分这一步,而直接做到薄荷脑,说明他们或许在不对称合成(Asymmetric Synthesis)方面有了很大进 相似文献
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光、铁谱技术对修复剂性能与机理的研究 总被引:1,自引:1,他引:0
采用光谱、铁谱分析技术对添加了金属摩擦表面改性剂的机车进行分析研究,探讨了修复剂的作用机理。在润滑油中添加修复剂后,当机车运行了25000km时.润滑油中金属元素的含量仍在运行正常浓度的范围,且各金属元素的含量变化趋于平缓,超硬、超滑的保护层形成。在机车润滑油中加入修复剂可减少机车磨损,降低油耗、检修成本及延长机车寿命。 相似文献
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对PVC冲击改性剂——MBS、CPE和ACR的分子组成和分子结构进行了分析,研究了其抗冲改性机理及对PVC制品低温冲击强度、耐候性、维卡软化点、韧性的影响。从高分子热力学的角度分析了CPE和ACR在PVC中分散所形成的制品结构。指明了传统ACR和CPE在PVC改性中所存在的优缺点。在此基础上分析了理想冲击改性剂ACR应具有的结构特点,并设计和开发了新型冲击改性剂ACRHL-56和HL-58,通过试验对其性能与传统冲击改性剂ACR和CPE进行了比较,发现其性能远优于后者。 相似文献
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Influence of Genotype and Cultivation Place on Various Ingredients of Oil-Gourd Seeds (Cucurbita pepo L.) In the seed of oil pumpkin from an international variety trial several components were analysed. The following results were found: 1. Oil contents were about 49% in mean and were significantly influenced by location, year, variety and by the interaction between location and year. 2. Protein contents laid about 38% in mean and were significantly changed by location. 3. Average crude fibre contents were about 5.17%. The interaction location/year was secured in F-test. 4. Oleic acid contents laid about 27.9% in mean and were influenced by variety, location, year and by the interaction location/year. 5. Average linoleic acid content was about 54.4% of TEA whereby differences within varieties, locations and years as well as interaction location/year were statistically secured. A negative correlation (r=-0.9915) exists between both fatty acids. 6. The tocopherol contents were 437 mg/kg oil in mean and were modificated analogous to oleic- and linoleic acid by variety, location, year and interaction location/year. 7. Average phosphatide contents were about 0.82% and were significantly influenced by variety, location as well as interaction location/year. 8. Mean values of the different minerals were: P = 211 ppm; K = 183 ppm; Mg = 105 ppm; Ca = 26.9 ppm; Na = 3.6 ppm. All elements were significantly depending on location, P and K were depending on variety, too. 相似文献
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我国微生物法水处理技术的研究进展 总被引:1,自引:0,他引:1
介绍了微生物絮凝剂的基本研究方法,综述了4种絮凝机理,对其絮凝效果的因素进行了探讨,阐述了微生物絮凝剂在众多领域的应用情况,指出了微生物絮凝剂在生产过程中的现存问题和解决措施,微生物絮凝剂具有高效、无毒,无二次污染、成本低等优点,为水处理技术的研究和发展提供了一个新的方向. 相似文献
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溶液共混法制备聚氨酯/碳纳米管复合材料及其性能 总被引:3,自引:1,他引:2
通过强酸处理方法对碳纳米管进行改性处理并对其结构和分散稳定性进行分析。采用溶液共混法制备了聚氨
酯/碳纳米管复合材料,利用FTIR对其结构进行了分析,探讨了碳纳米管对复合材料力学性能、热稳定性能以及弹
性回复率的影响。结果表明,碳纳米管经酸处理后添加了羧酸活性基团,提高了其在溶剂中的分散性|在复合材料
中,碳纳米管以较强氢键与大分子连接,复合材料的力学性能和热稳定性能都有所提高,而弹性回复率没有受到很
大影响。 相似文献
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Performance of Dowel-Welded L-joints for Wood Furniture 总被引:1,自引:0,他引:1
《Journal of Adhesion Science and Technology》2013,27(15):1829-1837
Rotationally welded wood dowels were used to hold together step butt and mortise and tenon L-joints and these joints were tested against European Norms for these types of joints. A factorial experiment was carried out in which (1) these two types of joints were tested, (2) 4 or 6 dowels per joint were used, (3) dowels were inserted at either 45° or 90° to the surface of the wood, (4) two types of wood were used, beech and European ash, and (5) two types of tests were carried out, namely compression and tension tests. The strength results were used to find out which of these were the most important individual parameters and their interactions, namely type of joint, number of dowels, and type of test. The strength results were well in excess of the relevant L-joints standard specifications for wooden windows. 相似文献
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聚氨酯/碳纳米管复合材料的制备及其性能研究 总被引:2,自引:0,他引:2
通过强碱球磨方法对多壁碳纳米管(MWCNTs)进行了改性处理,并对其化学结构和微观形态进行了分析.采用溶液共混法制备了聚氨酯(PUR)/MWCNTs复合材料.利用扫描电子显微镜、傅立叶变换红外光谱仪对其进行了表征.探讨了MWCNTs对PUR/MWCNTs复合材料力学性能、热稳定性以及电导率的影响.结果表明,MWCNTs... 相似文献