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1INTRODUCTION TraditionalChinesemedicines(TCMs)are veryimportantduetotheirextensiveuseinpre ventingandcuringmanydiseasesforhumans.Al thoughonlysomecompoundsmightberesponsible forpharmaceuticaleffects,traditionalChinese medicinesusuallycontaintoomanycomponentsandformaverycomplexsystem,whichmakesthe screeningandanalysisofbioactivecomponentsex tremelydifficult[1]comparedwiththoseofwesternmedicines.Whensuchcomplexsamplesareana lyzed,itiscommonthatdifferentcontentsof multi componentsandgreatd… 相似文献
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烟草行业现采用的卷烟防伪标识存在防伪成本高,防伪手段易复制,难以杜绝批量假冒产品等问题,利用计算机技术、密码学、喷码技术、语音技术、无线通信技术相结合,运用"即算即得"的数码编译模式,构建了烟草企业产品数码追溯防伪及语言/短信智能系统。该系统采用模块化设计,在生产过程中实时采集卷烟生产信息,通过数码编译软件的处理,及时生成能反映生产信息的产品追溯防伪数码,并在线喷印在卷烟产品包装上,实现了产品追溯和防伪功能。该系统在烟草工业企业的产品质量全过程的追溯管理、防伪保真、营销互动与移动办公等方面也有良好的应用效果。 相似文献
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Simultaneous determination of adenine, uridine and adenosine in cordyceps sinensis and its substitutes by LC/ESI-MS 总被引:1,自引:0,他引:1
A simple, sensitive and reproducible high performance liquid chromatography-mass spectrometry coupled with electrospray ionization method for simultaneous separation and determination of adenine, adenosine and uridine was developed. The analytical column is a 2.0 mm× 150 mm Shimadzu VP-ODS column and volume fraction of the mobile phase is 86.5 %water, 12.0%methanol and 1.5%formic acid. 2-chloroadenosine was used as internal standard. Selective ion monitoring mode and selective ion monitoring ions at ratio of mass to electric charge of 136 for adenine, 268 for adenosine and 267 for uridine were chosen for quantitative analysis of the three active components. The results show that the regression equations and linear range are Y=0. 062X 0. 005 and 2.0 - 140.0μg · mL 1for adenine, Y=0. 049X 0. 004 and 4. 0 - 115.0 μg · mL-1 for uridine, Y=0. 154X 0. 014 and 1.0 - 125.0 μg · mL 1 for adenosine. The limits of detection are 0.6 μg · mL 1 for adenine, 1.0μg · mL-1 for uri dine and 0.2 μg · mL 1 for adenosine.The recoveries of the three constituents are from 96.6% to 103.2%. 相似文献
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电气石复合材料在卷烟减害降焦中的应用 总被引:2,自引:0,他引:2
利用电气石的热释电性、压电性和自发极化性产生的荷电效应,对卷烟烟气有害成分中的带电物质进行有效吸附原理,本实验研制了一种含电气石复合功能涂料的成形纸并将其用于卷烟减害降焦中.结果表明,含电气石复合功能涂料成形纸可降低卷烟危害性,焦油、CO、NOx、亚硝胺、羰基化合物、氢氰酸、苯并芘类物质降低率分别为12.6%、15.O%、25.2%、12.5%、12.2%、30.4%、19.4%,且卷烟感官质量评价较好,没有明显影响卷烟的抽吸风格. 相似文献
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反作用轮扰动对三轴稳定地球同步卫星姿态影响分析 总被引:1,自引:0,他引:1
根据带动量部件的三轴稳定卫星姿态动力学方程,利用GOES-8卫星和RWA-15型反作用轮的有关数据,研究星体和反作用轮之间的力学关系,分别在不含有反作用轮、含有反作用辁但不考虑反作用轮静动态力矩扰动、含有反作用轮并且考虑静动态力矩扰动的三种情况下分析了反作用轮的力矩扰动对三轴稳定地球同步轨道卫星姿态的影响,最后归结到滚动-俯仰-偏航角三个姿态角的偏差上面来。 相似文献
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Determination of volatile components in cut tobacco with gas chromatography-mass spectrometry and chemometric resolution 总被引:2,自引:0,他引:2
Chromatography-mass spectrometry(GC-MS)was used to analyze the volatile components of cut tobacco samples with the help of heuristic evolving latent projections(HELP).After extracting with simultaneous distillation and extraction method,the volatile components in cut tobacco were detected by GC-MS.Then the obtained original two-dimensional data were resolved into pure mass spectra and chromatograms.The qualitative analysis was performed by similarity searches in the national institute of standards and technology(NIST)mass database with the obtained pure mass spectrum of each component and the quantitative results were obtained by calculating the volume of total two-way response.The accuracy of qualitative and quantitative results were greatly improved by using the two-dimensional comprehensive information of chromatograms and mass spectra.107 of 141 separated constituents in the total ion chromatogram of the volatile components were identified and quantified,accounting for about 88.01% of the total content.The result proves that the developed method is powerful for the analysis of complex cut tobacco samples. 相似文献
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卷烟主流烟气中烟草特有亚硝胺的液质联用分析 总被引:3,自引:3,他引:3
采用0.1mol/L醋酸铵水溶液萃取、固相萃取纯化和高效液相色谱-三级四极杆质谱法测定了12种卷烟样品主流烟气中4种烟草特有亚硝胺(TSNAs)。结果表明:①NNN、NAT、NNK和NAB的检测限分别为0.07、0.05、0.05和0.04ng/mL,回收率在94.0%~103.5%之间,相对标准偏差分别为3.02%、4.19%、6.10%和6.62%;②2种进口混合型卷烟主流烟气中的总TSNAs均远远高于10种国产烤烟型卷烟。该法适合批量卷烟主流烟气中TSNAs的定量分析。 相似文献
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