积雪草提取物对成纤维细胞胶原合成的影响

应用不同剂量的积雪草苷和羟基积雪草作用于体外培养成纤维细胞（Human Skin Fibroblast,HSFb）后，通过放射免疫的方法测定实验组和空白对照组细胞上清中Ⅰ型前胶原氨基端须原（PⅠNP）和Ⅲ型前胺原氨基端肽原（PⅢNP）含量。结果显示：①与空白对照组相比，积雪草苷和羟基积雪草苷可有效刺激体外培养HSFb PⅠNP和PⅢNP的分泌；②积雪草苷和羟基积雪草苷刺激靶细胞PⅠNP和PⅢNP分泌的生物学作用呈现明显的量效关系；③在10μg/mL～150μg/mL剂量内，Ad对HSFb刺激PⅠNP的分泌显示出比Md更强的生物活性（ρ＜0.01）。     

积雪草苷与羟基积雪草苷及积雪草苷-B的分离与制备

用反相制备液相色谱法从积雪草总苷中分两步分离得到了高纯度的积雪草苷、羟基积雪草苷和积雪草苷-B。采用YMCODS-AC18制备柱(250mm×50mmID,15μm,Waters),考察了柱温、流动相流速和上样量等对分离的影响,确定了适宜的工艺条件:流动相为甲醇/水(1:1,v/v),柱温30℃,流速50mL·min-1,进样浓度为0.025g·mL-1,进样体积20mL。在该工艺条件下,得到积雪草苷产品纯度为98.8%,收率为99.8%。采用PhenomenxHYperprepC18半制备柱(250mm×10mmID,8μm),水/乙腈(80:20,v/v)作为流动相,柱温30℃,流速3mL·min-1,将YMCODS-AC18制备柱分离得到的羟基积雪草苷部分溶解于50%甲醇水溶液中,进样浓度为0.024g·mL-1,进样体积50μL,分离得到羟基积雪草苷和积雪草苷-B,纯度分别为76.2%和82.3%。本工艺操作简便,分离效率高,产品质量好,为积雪草苷、羟基积雪草苷和积雪草苷-B的制备研究提供了一种新的方法。     

氧化铝脱色纯化羟基积雪草苷工艺研究

研究了氧化铝柱层析脱色纯化积雪草中羟基积雪草苷的工艺.以积雪草提取物为原料,水溶解后上氧化铝干柱,柱层析脱色来纯化制备高纯度羟基积雪草苷.最佳工艺路线为选用100～200目酸性氧化铝作为层析剂,洗脱剂选用30％乙醇,洗脱体积选用3BV,积雪草提取物质量与酸性氧化铝的用量比为1:10.该工艺可简单有效地对含有羟基积雪革苷...     

高效液相色谱法测定化妆品中羟基积雪草苷和积雪草苷的含量

建立了一种使用高效液相色谱测定化妆品中羟基积雪草苷和积雪草苷含量的方法。样品经提取液超声提取后,用Acutfex PA-C₁₈色谱柱(250 mm×4.6 mm×5μm)分离,以体积比2:2:6的甲醇-乙腈-水作为流动相等度洗脱,流速1.0 mL/min,柱温35℃,检测波长205 nm。采用外标法测定,结果表明,积雪草苷和羟基积雪草苷在质量浓度5～100μg/mL内线性关系良好,方法的检出限为质量分数0.001 5%,定量限为质量分数0.005%。在不同类型的空白化妆品(水类、乳类、膏霜类)中进行加标回收试验,方法的回收率为82.8%～106%,相对标准偏差为0.94%～4.28%。该方法前处理简单,分离效率高,重复性好,准确度和精密度高,适用于化妆品中积雪草苷和羟基积雪草苷的测定。     

积雪草提取物在个人护理品中的应用

主要介绍了积雪草的主要功效成分和基本特性,阐述了积雪草在个人护理品中可具有抗菌、消炎、促进成纤维细胞和胶原蛋白的合成等多种功效,该产品在晒后修护、伤口愈合、疤痕修复、抗衰老等个人护理品领域市场前景广阔。     

积雪草提取工艺的研究

采用不同pH值75%乙醇溶液对积雪草全草进行提取,测定积雪草苷含量。超声法对积雪草提取,考察了乙醇浓度、料液比、超声时间和浸泡时间对提取效果的影响。结果表明,积雪草中积雪草苷最佳提取工艺条件:乙醇浓度60%,料液比1∶12,超声时间1 h,浸泡时间15 h。     

积雪草苷对成纤维细胞胶原相关基因的作用

应用积雪草苷（Asiaticoside,Ad）作用于体外培养成纤维细胞（Human Skin Fibroblast,HSFb）后，通过基因芯片杂交技术，研究Ad对HSFb基因表达谱的影响；进一步，通过Northem杂交和放射免疫技术研究Ad对胶原代谢相关可疑靶基因在mRNA水平和蛋白水平的影响，以探讨Ad在皮肤损伤修复中的作用机制。结果显示：①细胞外基质（Extracellular Matrix,ECM）合成相关基因在不同时相点基因表达谱明显示不同；②在蛋白水平和mRNA水平，Ad具有刺激HSFbⅠ型和Ⅲ型胶原合成的作用。提示，Ad对胶原合成相关基因具有明显的调节作用。     

依克多因与羟基积雪草甙协同抗炎作用的研究

采用LPS诱导RAW264.7细胞炎症模型证实了依克多因、羟基积雪草甙及依克多因与羟基积雪草甙组合配比在设定的质量浓度条件下,对LPS诱导的RAW264.7细胞产生NO均具有良好的抑制作用,即在细胞水平具有抗炎活性.同时依克多因与羟基积雪草甙组合在设定的不同质量浓度及配比下对NO的抑制率大多高于单一组分,并且依克多因与...     

化妆品功效评价(Ⅷ)——3D皮肤模型在化妆品功效评价中的应用

概述了3D皮肤模型在化妆品功效评价中的应用,对3D皮肤模型的类型以及基于各种3D皮肤模型的主要体外功效检测方法进行了介绍。3D表皮模型由角质形成细胞构成,用于皮肤屏障、保湿、抗炎、UV防护、经皮吸收等功效性检测;3D黑素皮肤模型由角质形成细胞和黑素细胞构成,主要用于美白功效检测;3D全层皮肤模型由角质形成细胞和成纤维细胞构成,主要用于抗衰功效检测。基于3D皮肤模型,可获得多维度检测结果,实现对化妆品受试物功效的综合评价。     

抗衰老化妆品体外细胞水平上功效评价方法研究进展

从角质形成细胞模型抗衰老功效评价方法、成纤维细胞模型抗衰老功效评价方法以及三维皮肤模型抗衰老功效评价方法 3方面,综述了抗衰老化妆品体外细胞水平上功效评价方法。在培养的角质形成细胞、成纤维细胞及三维皮肤模型上对化妆品有效成分进行细胞学观察及关键指标分子生物学检测,这些技术对抗衰老产品的功效评价和研发具有广泛的应用价值。     

Insect antifeedant properties of anthranoids from the genusVismia

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.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

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.     

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.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

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.     

2007～2008年世界塑料工业进展

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.     

2005～2006年国外塑料工业进展

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。