Development and usage of a NIST standard reference material for real time PCR quantitation of human DNA

National Institute of Standards and Technology SRM 2372 human DNA quantitation standard has been produced to support the need for a human-specific DNA quantitation standard in forensic casework and calibration of new quantitative polymerase chain reaction (qPCR) assays. The conventional DNA concentration has been assigned with one of the U.S. National Reference UV/Visible Spectrophotometers, assuming an absorbance of 1.0 at 260 nm equals 50 ng/μL of double stranded DNA. In addition, an interlaboratory study has been conducted, to verify that the SRM 2372 materials perform well in currently used DNA quantitation assays by the forensic DNA community. Each unit of SRM 2372 consists of three well-characterized DNA extracts. Component A is a single-source human male material derived from blood. Component B is a multiple-source human female material derived from blood. Component C was purchased as a purified unsheared genomic human DNA (Sigma-Aldrich Co., St. Louis, MO) obtained as a lyophilized human genomic extract and has both male and female donors. SRM 2372 is intended to enable the comparison of DNA concentration measurements across time and place. Manufacturers can use SRM 2372 to validate the values assigned to their own reference materials. Individual forensic laboratories can use SRM 2372 to validate DNA quantitation methods and to verify the assigned concentration of in-house or commercial DNA calibration standards.     

定量数据关联二级全扫描与选择反应监测在常见毒物检测中的应用

目的建立快速、准确,可同时进行定性定量的常见毒物的筛选检测方法。方法用Thermo TXQQuantum XLS气相色谱—三重四级杆质谱仪对57种常见毒物及内标惊醒检测。结果得到了57种常见毒物及内标的选择反应检测信息,并且农药鼠药检测限可达到0.1ng/μL水平,药品检测限达27pg/μL水平,毒品检测限达0.4ng/μL水平。结论该方法具有快速、灵敏、准确的优点,可在一次扫描中完成样品的定性定量分析检测。