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在Sinochrom ODS-BP(5μm,4.6 mm×200 mm)色谱柱上,以甲醇-乙酸钠溶液为流动相,采用LIFD230激光诱导荧光检测器,建立了一种对饮料中维生素B2进行检测的反相高效液相色谱-激光诱导荧光检测方法。考察了样品处理方法、流动相配比及流动相pH对检测结果的影响。对检测条件进行了优化,在柱温为室温、流速为1 mL/min、V(甲醇)∶V(0.01 mol/L乙酸钠溶液)为1∶1及pH为5.0的条件下,维生素B2的线性范围为0.05~5μg/mL,样品加标回收率为96.52%~99.03%,RSD为3.25%,检出限为9.4×10-4μg/mL。该方法具有灵敏度高、检出限低及响应快等特点。 相似文献
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高效液相色谱法测定化妆品中的苯氧异丙醇 总被引:2,自引:0,他引:2
以超声辅助提取法对不同基质类型的化妆品样品进行预处理,采用高效液相色谱法测定化妆品中的苯氧异丙醇,色谱条件为:Kromasil C18色谱柱(250 mm×4.6 mm i.d.,5μm),流动相为V(水)∶V(乙腈)∶V(甲醇)∶V(四氢呋喃)=60∶25∶10∶5的混合溶液,流速1.2 mL/min,检测波长268 nm,柱温30℃。结果表明,在此条件下苯氧异丙醇在1.0~200.0μg/mL范围内与相应的峰面积具有良好的线性关系(相关系数r=0.999 9),线性回归方程为A=74 280ρ-23 780,回收率为95.6%~102.4%,RSD为0.66%~1.05%。 相似文献
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建立了螯合剂乙二胺二琥珀酸(EDDS)的2种异构体[S,S]-EDDS与[R,S]-EDDS的液相色谱测定方法。采用DAD检测器,ODS C_(18)色谱柱(4.6 mm×250 mm,5μm),柱温30℃,流动相为V(6 mmol/L醋酸铜缓冲液)∶V(甲醇)=90∶10,流速1.0mL/min,254nn波长下检测。结果显示,[S,S]-EDDS与[R,S]-EDDS分别在20μg/mL~210μg/mL和6μg/mL~60μg/mL有良好的线性关系,相关系数均0.999,相对标准偏差RSD1%,回收率在95%~105%。此方法准确、可靠,可用于EDDS中[S,S]-EDDS与[R,S]-EDDS的分析测定。 相似文献
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为高效准确地测定土壤中10种氨基甲酸酯类农药,研究建立一种适用于土壤中10种氨基甲酸酯类农药含量的柱后衍生-液相色谱快速检测方法。试验优化提取条件、固相萃取柱和色谱条件,结果表明:水浴温度35℃,提取液为V(甲醇)∶V(二氯甲烷)=1∶1,提取体积为50 mL、超声时间25 min,采用Carb/NH2固相萃取柱净化,选择Shim-pack FC-ODS(75 mm×4.6 mm, 3μm)液相色谱柱分析测试。本检测方法的线性系数均可达到0.999 3以上;线性范围为0.02~10μg/mL;检出限均小于2.0μg/kg;对10.0 g左右的土壤进行低(5μg/kg)、中(50μg/kg)、高(500μg/kg)三个浓度水平的加标测试时,10种氨基甲酸酯类农药的加标回收率为75.7%~118.5%;重现性良好,相对标准偏差为0.8%~6.8%;该方法能够满足测定土壤中10种氨基甲酸酯类农药的需要。 相似文献
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原料药的含量测定是新药研发的关键步骤。依据新药注册标准,建立了一种新型抗高血压原料药含量检测的高效液相色谱方法。按照《药典》(2020版)指导原则,优化色谱条件,并进行方法学验证,将其用于不同批次原料药的含量检测。结果显示,最佳色谱条件为Aligent TC-C18色谱柱(250 mm×4.6 mm, 5μm),V(甲酸)∶V(甲醇)=20∶80[φ(甲酸)=0.2%]等度洗脱,流速1.0 mL/min,柱温30℃,检测波长280 nm。该方法系统适用性强,重复性好,专属性高,t<48 h对照溶液性质稳定;线性范围为1.5~2 000μg/mL,线性方程为y=3.224 4x-2.435 3(r=0.999 9),检测限为0.5μg/mL,回收率为99.3%~104.5%。该方法为该原料药的质量监控提供了可靠的保障。 相似文献
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目的建立高效液相色谱法测定熊果酸-乙醇共晶中熊果酸的含量分析方法。方法以Sino Pak-C18(4.6 mm×250 mm,5.0μm)为色谱柱,甲醇∶0.1%磷酸水(v∶v(88∶12))为流动相,流速为1.0 m L/min,进样量为20μL,在210 nm波长处测定检测其含量。结果熊果酸在浓度80.0~120.0μg/m L范围内线性关系良好;准确度、精密度、稳定性试验的RSD均小于2.0%。结论该方法操作简便,结果重现性好,准确快速,适用于熊果酸含量的测定。 相似文献
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建立了化妆品中限用有机合成着色剂颜料红49的高效液相色谱/二极管阵列检测器检测方法.色谱柱采用C18反相柱(250 mm×4.6 mm,5μm),流动相为V(10 mmol/L的四甲基氢氧化铵水溶液(醋酸调pH =7))∶V(甲醇)=30∶70的混合溶液,等度洗脱,检测波长为494 nm,柱温30℃,流速1.0 mL/min,以保留时间定性,外标法定量.结果表明,在此条件下颜料红49在1 ~ 600 μg/mL范围内与其相应的峰面积呈良好的线性关系,检出限为0.2μg/mL,回收率为90.94% ~ 101.05%. 相似文献
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采用反相高效液相色谱法测定化妆品中巯基乙酸的含量。色谱条件为:Kromasil C18(250 mm×4.6 mm,5μm)色谱柱,流动相为V(乙腈)∶V(0.01 mol/L KH2PO4溶液(磷酸调pH=2.5))=10∶90的混合溶液,流速1.0 mL/min,检测波长215 nm,柱温30℃,进样量20μL。结果表明,此条件下巯基乙酸在5.0~150.0μg/mL质量浓度范围内与峰面积线性良好,线性回归方程为Y=5 100X-13 400(r=0.999 8),平均回收率在98.4%~100.8%,RSD为0.09%~0.84%。 相似文献
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M. S. J. Simmonds W. M. Blaney F. Delle Monache M. Marquina Mac-Quhae G. B. Marini Bettolo 《Journal of chemical ecology》1985,11(12):1593-1599
Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria. 相似文献
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Cheng-Le Zhao Shane Porzio Alan Smith Haiyan Ge H. T. Davis L. E. Scriven 《Journal of Coatings Technology and Research》2006,3(2):109-115
Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively.
There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized.
High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without
the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of
fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to
achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic
SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve
F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender
particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing,
and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing
or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually
preserves suspension stability during freezing.
Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago,
IL. Tied for first place in The John A. Gordon Best Paper Competition. 相似文献
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Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US
In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae
and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted
in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures
(release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species
(Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species
to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were
exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of
separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles
from the southeastern region of the US. 相似文献
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Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed. 相似文献
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中蓝晨光化工研究院有限公司《塑料工业》编辑部 《塑料工业》2009,37(3)
收集了2007年7月~2008年6月世界塑料工业的相关资料,介绍了2007~2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍. 相似文献
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中蓝晨光化工研究院《塑料工业》编辑部 《塑料工业》2007,35(3):1-25,67
收集了2005年7月~2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、通用热固性树脂(酚醛、聚氨酯、不饱和树脂、环氧树脂)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。 相似文献