GC-FID

摘要： 建立了以甲醇提取,利用GC-FID法测定湿巾中1,2-丙二醇和1,3-丙二醇的方法,结果表明:2种目标物质在5.0～160.0 mg/L之间线性关系良好,相关系数在0.9993以上;方法相对标准偏差为0.46％～0.59％,方法平均加标回收率为95.2％～105.6％,方法检测限在1.5～2.0 mg/kg之间.该方法简单、灵敏,可使各组分得到很好的分离,适用于湿巾中丙二醇的检测.

摘要： 挥发性有机物(VOCs)是当前重要的大气污染物,随着环保意识的加强,人们对VOCs关注程度越来越大.本文对VOCs现有应用广泛的GC(GC-FID、GC-PID)和MS(GC-MS、PTR-MS、TOF-MS)方法以及它们运行原理进行了详细的介绍,并根据实际情况,对应用最为广泛的GC-FID和GC-MS方法进行了对比探讨.表明GC-MS检出限、精密度运行情况优于GC-FID,且灵敏性更好,但维护成本较高;GC-FID校准曲线相关性优于GC-MS,但维护成本更低.

摘要： 本文介绍了 GXH-9023型固定污染源挥发性有机物VOCs在线监测系统测量原理、配置构成、参数,系统采用高温取样、预处理技术、色谱分离等关键技术.现场测试结果表明,基于GC-FID原理的固定污染源挥发性有机在线监测系统,具有测量精度高、稳定性好、通用性强的特点,GXH-9023满足固定污染源排放挥发性有机物的在线监测要求.

摘要： [目的]红火蚁Solenopsis invicta栖息在真菌和细菌较丰富的土壤环境中,容易受多种真菌和细菌性病原体的侵染,因红火蚁的毒液具有很好的防御和抗菌作用,致使红火蚁能生存于此类土壤环境中.为了探索这一奥秘,本研究旨在建立红火蚁巢穴土壤中的毒液生物碱的最佳提取方法,并对毒液生物碱成分进行定量分析.[方法]采集蚁巢周边3 m处的土壤,进行添加、回收红火蚁毒液实验.采用抽滤法提取土壤中的毒液生物碱,利用GC-FID对毒液生物碱成分进行定量分析,筛选最佳的提取溶剂,并且确定添加三乙胺的最佳体积比.然后用最优方法提取蚁巢土壤中的毒液生物碱,并进行定量分析.[结果]正己烷、二氯甲烷、乙酸乙酯、丙酮和甲醇5种提取溶剂中,正己烷处理的生物碱回收率略优.当添加的三乙胺的体积为1 mL及以上时,提取效果最佳.红火蚁巢穴土壤中的毒液生物碱成分中,trans-C15∶1的含量最高,trans-C13∶1的含量次之.巢穴土壤中总生物碱含量约为22 μg/g.[结论]三乙胺有助于提取蚂蚁巢穴土壤中的毒液生物碱.红火蚁巢穴土壤中的生物碱浓度较高,有可能对巢穴土壤微生物群落产生重要影响.

摘要： In this research we present that Carthamus Tinctorius L.(gen.Asteraceae,otherwise known as Safflower)(Fig.1)may contain agents active in Cryptococcal infections,malaria and Leishmaniasis,as treatment options are becoming scarce due to drug resistance development.Phytochemistry and pharmacological activities(antimicrobial,antimalarial,antileishmanial)of C.tinctorius L.were analyzed.The composition of volatile oil of safflower dried flowers was analyzed by gas chromatography-mass spectrophotometry with flame ionization detector(GC-FID)and in vitro sensitivity assays were performed to assess biological activity.8 known and 3 unknown compounds were detected in the extract(Fig.1).Then the Safflower ointment was manufactured and its acute toxicity study on rats was tested.The volatile oil of C.tinctorius L exhibited activity against Cryptococcus neoformans,Plasmodium falciparum and Leishmania donovani.Safflower volatile oil has anticryptococcal,antimalarial and antileishmanial effects.The prepared ointment had an excellent acute toxicity safety profile.

摘要： Research into long-chain polyunsaturated fatty acids (LC-PUFA), such as docosahexaenoic acid (DHA C22:6 n-3), has shown that their inclusion in the human diet is linked with many health benefits. This has led to an increased interest in the enrichment of certain foodstuffs with DHA by supplementing animal fed with DHA-rich ingredients which can lead to an increased uptake in the meat, milk and eggs animal by-products. The microalgae Aurantiochytrium limacinum has been found to be especially useful in this pursuit. It is subsequently desirable to availably have a simple and robust method for the routine analysis of DHA and other fatty acids in the algal biomass. The AOAC method 996.06 is often followed for the analysis of fatty acids in foods and demonstrating that its fitness for purpose in the analysis of DHA and additional fatty acids in Aurantiochytrium limacinum is therefore the objective of this paper. A validation of the method for the determination of DHA and three other fatty acids in Aurantiochytrium limacinum is presented. The method was found to be linear over the following ranges for each fatty acid methyl ester (FAME) analyte;50 to 15,000 μg/ml (C14:0), 300 to 95,000 (C16:0), 25 to 15,000 (C18:0) and 300 to 59,375 (C22:6). The accuracy, precision and LOD and LOQ of the method were confirmed and its robustness tested. The application of the method to assess the stability of Aurantiochytrium limacinum containing two alternative antioxidants was further examined. The investigation showed that DHA was stable over six months with the inclusion of either Duralox? or ethoxyquin as an antioxidant and ethoxyquin could additionally stabilize DHA in Aurantiochytrium limacinum up to 24 months.

摘要： 目的：建立甲醇中毒死亡开棺的定性定量分析方法。有效、快速、准确检验甲醇中毒死亡的开棺检材;已用于办理实际案件,获得了满意结果。

摘要： 目的：建立甲醇中毒死亡开棺的定性定量分析方法。有效、快速、准确检验甲醇中毒死亡的开棺检材;已用于办理实际案件,获得了满意结果。

摘要： 目的：建立甲醇中毒死亡开棺的定性定量分析方法。有效、快速、准确检验甲醇中毒死亡的开棺检材;已用于办理实际案件,获得了满意结果。

摘要： 目的：建立甲醇中毒死亡开棺的定性定量分析方法。有效、快速、准确检验甲醇中毒死亡的开棺检材;已用于办理实际案件,获得了满意结果。

摘要： 目的：建立甲醇中毒死亡开棺的定性定量分析方法。有效、快速、准确检验甲醇中毒死亡的开棺检材;已用于办理实际案件,获得了满意结果。

摘要： 目的：建立甲醇中毒死亡开棺的定性定量分析方法。有效、快速、准确检验甲醇中毒死亡的开棺检材;已用于办理实际案件,获得了满意结果。

摘要： 目的：建立甲醇中毒死亡开棺的定性定量分析方法。有效、快速、准确检验甲醇中毒死亡的开棺检材;已用于办理实际案件,获得了满意结果。

摘要： 建立了水中芥子亚砜的提取和分析方法,采用超声波振荡以二氯甲烷提取水中的芥子亚砜,并用GC-FID分析.该方法回收率为72﹪~96﹪,灵敏度为5.0×10g,最低检测限为0.1ppm,相对平均偏差为0.9552﹪.水中芥子亚砜的稳定性与水的酸度有一定的关系,弱酸性能抑制其降解.

摘要： 建立了水中芥子亚砜的提取和分析方法,采用超声波振荡以二氯甲烷提取水中的芥子亚砜,并用GC-FID分析.该方法回收率为72﹪~96﹪,灵敏度为5.0×10g,最低检测限为0.1ppm,相对平均偏差为0.9552﹪.水中芥子亚砜的稳定性与水的酸度有一定的关系,弱酸性能抑制其降解.

摘要： 建立了水中芥子亚砜的提取和分析方法,采用超声波振荡以二氯甲烷提取水中的芥子亚砜,并用GC-FID分析.该方法回收率为72﹪~96﹪,灵敏度为5.0×10g,最低检测限为0.1ppm,相对平均偏差为0.9552﹪.水中芥子亚砜的稳定性与水的酸度有一定的关系,弱酸性能抑制其降解.