长期、小剂量、多次、多范围投放毒鼠强1例

通过一起刑事投毒案件进行分析,对较罕见的皮肤吸入性毒鼠强中毒方式进行报道.     

外伤如意膏中龙脑含量测定

目的建立气相色谱法测定外伤如意膏中冰片含量的方法。方法采用WAXPEG-20M毛细管柱,柱温为140℃,进样口温度为230℃,检测器温度为250℃,流速为1．0mL／min。结果线性范围为0．05138～0．5138mg,平均回收率为96．0％,RSD=1．26。结论该方法简便、易操作,能有效控制该产品的质量。     

GC法同时测定利胆排石片中厚朴酚及和厚朴酚含量

目的建立利胆排石片中厚朴酚、和厚朴酚的含量测定方法。方法采用GC法,二甲基聚硅氧烷毛细管色谱柱,载气：氮气,检测器：FID。结果回归方程厚朴酚、和厚朴酚分别为Y=94．12x＋11．28,r=0．9999;Y=135X＋18．21,r=0．9999。结果表明,厚朴酚、和厚朴酚分别在0．01482—1．482、0．02103～2．103mg·ml-1范围内具有良好的线性关系。回收率厚朴酚、和厚朴酚分别为99．6％、99．8％,各成分加样回收率均符合要求。结论该方法简便快捷,准确、重复性好,灵敏度高,可用于建立利胆排石片的定量质量标准。     

不同萃取方法对番茄籽油理化性质与脂肪酸含量的影响

分别采用超临界ＣＯ２萃取技术和传统溶剂法从番茄籽中萃取脂肪油，经过甲酯化处理后，用气相色谱法分析出亚油酸等５种脂肪酸占总脂肪酸的９８．５％．同时对油的其它理化指标进行了测定。对测定结果进行了比较分析，说明超临界ＣＯ２萃取所得番茄籽油品质更好。并对番茄籽油的营养学机理作了讨论。     

Ambient mass spectrometry for rapid diagnosis of psychoactive drugs overdose in an unstable patient

A 25-year-old man suffered from consciousness change was sent to our emergency department by friends who reported that they were not sure what had happened to him. Physical examination revealed bilateral pupils dilatation, lethargy, slurred speech, and ataxia. Computer-aided tomographic scan of the brain revealed no definite evidence of intracranial lesions. Routine laboratory tests revealed total physiological turmoil. Despite immediate commencement of aggressive treatment, the patient's condition deteriorated long before the traditional drug screen provided an answer for the identities of the multiple drugs overdose. It ended up with the need for cardiopulmonary resuscitation, but in vain. At the end of the tragic event, under the suggestion of a colleague, a portion of the patient's urine specimen was sent to our university esoteric laboratory for rapid analysis by means of a newly-developed thermal desorption-electrospray ionization-mass spectrometry. Ketamine, 3,4-methylenedioxymethamphetamine, and 3,4-methylenedioxyamphetamine were identified in the urine sample within 30 s. Conventional toxicological testing techniques like gas chromatography–mass spectrometry or liquid chromatography-mass spectrometry are currently used for identifying abused drugs. One concern is their time-consuming sample pretreatment which leads to relatively low efficiency in terms of turnaround time for revealing the identity of the consumed drugs particularly when the patients are severely overdosed. We learned a lesson from this case that a more efficient toxicological identification technique is essential to expedite the process of emergency care when the patients are so heavily overdosed that they are under critical life-threatening conditions.     

Senecavirus A Enhances Its Adaptive Evolution via Synonymous Codon Bias Evolution

Synonymous codon bias in the viral genome affects protein translation and gene expression, suggesting that the synonymous codon mutant plays an essential role in influencing virulence and evolution. However, how the recessive mutant form contributes to virus evolvability remains elusive. In this paper, we characterize how the Senecavirus A (SVA), a picornavirus, utilizes synonymous codon mutations to influence its evolution, resulting in the adaptive evolution of the virus to adverse environments. The phylogenetic tree and Median-joining (MJ)-Network of these SVA lineages worldwide were constructed to reveal SVA three-stage genetic development clusters. Furthermore, we analyzed the codon bias of the SVA genome of selected strains and found that SVA could increase the GC content of the third base of some amino acid synonymous codons to enhance the viral RNA adaptive evolution. Our results highlight the impact of recessive mutation of virus codon bias on the evolution of the SVA and uncover a previously underappreciated evolutionary strategy for SVA. They also underline the importance of understanding the genetic evolution of SVA and how SVA adapts to the adverse effects of external stress.     

复方草珊瑚含片中薄荷脑的定量分析

目的建立一种用气相色谱法测定复方草珊瑚含片中薄荷脑含量的方法。方法采用HP-FFAP弹性石英毛细管柱，程序升温，FID检测器，检测器温度250℃，进样口温度250℃。结果薄荷脑在0．020～0．300μg范围内呈线性关系，平均回收率为99．36％，RSD=1．12％。结论该方法测定复方草珊瑚含片中薄荷脑的含量操作简便、结果准确可靠，可作为复方草珊瑚含片中薄荷脑含量测定的方法。     

顶空气相色谱法测定医用透明质酸钠凝胶中乙醇残留量

用顶空气相色谱法,测定医用透明质酸钠凝胶中乙醇残留量.采用HP-5毛细管柱;柱温:100℃;进样口温度:200℃;检测器温度:250℃;气体流速:N210ml/min,H240ml/min,Air375ml/min.结果表明:线性试验与精密度良好,回收率为96%～105%,RSD为5.6%,检出限为0.1μg/g.采用顶空气相色谱法,测定医用透明质酸钠凝胶中乙醇残留量,简便、准确.     

顶空气相色谱法测定醋酸烯诺孕酮埋植剂中环氧乙烷的残留量

用顶空气相色谱法测定醋酸烯诺孕酮埋植剂中环氧乙烷的残留量，结果表明，线性试验与精密度良好，平均回收率为99．8％，残留量为0．93％。样品在灭菌后，室温放置3天，其环氧乙烷残留量均在0．0001％以下，符合环氧乙烷残留量应不大于0．001％的规定。表明采用顶空气相色谱法测定醋酸烯诺孕酮理植剂中环氧乙烷残留量，方法简便，结果准确，适用于对该产品中环氧乙烷残留量的检测与控制。