25 June 2014, Volume 39 Issue 3
    

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  • The study on stability of heroin standard in organic solvents
    LI Hong, ZHAO Wen-song, FANG Ping, YANG Hong-mei, JIAO De-qiang, LI Shao-peng, LU Zhi-qiang, LI Can-peng
    Forensic Science And Technology. 2014, 39(3): 3-3.
    Abstract ( ) Download PDF HTML   Knowledge map Save
    Objective To explore the stability of heroin in various organic solvents.Methods An internal standard method of gas chromatography (GC) was employed to analyze the content of heroin (prepared in our laboratory) in organic solvents. The content variation of heroin in five kinds of organic solvents kept in refrigeration was continuous monitored at different time periods.Results The results demonstrated that the heroin content in ethanol, trichloromethane and acetonitrile did not change significantly within 30 days. However, the heroin content increased significantly from 7 to 30 days when acetone was used as solvent and the heroin content in methanol showed an obvious decrease trend from 0 h to 30 days.Conclusion Ethanol, trichloromethane and acetonitrile can be selected as the solvent of heroin, but acetone and methanol are not suitable as solvent of heroin.
  • Analysis of organic explosives by using XRD
    WANG Li-chun, MA Jian, LUO Jing-feng
    Forensic Science And Technology. 2014, 39(3): 6-8.
    Abstract ( ) Download PDF HTML   Knowledge map Save
    Organic explosives including PA, PTEN, RDX and TNT were analyzed by XRD. The results demonstrated that XRD is a rapid, simple and nondestructive method for analysis of organic explosives.
  • Determination of four drugs in blood by accelerated solvent extraction coupled with GC/MS
    LI Wen-hai, LIN Da-wei, SUN Hong-lei, MU TAI LI FU·MAI MAI TI TU XUN, WANG Lei
    Forensic Science And Technology. 2014, 39(3): 9-11.
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    Objective To develop an analysis method for determining drugs from blood.Methods Methadone, cocaine, thebaine and heroin in blood were extracted by accelerated solvent extraction(ASE) and analyzed with GC/MS.Results The recoveries of four drugs were ranged from 87.8% to 97.5%. A good linear relationship was obtained at the concentration range of 0.4μg/mL ~4.0μg/mL.Conclusion The method has high recovery, good repeatability and easy to operation. It can be used to the casework.
  • Development of fingerprint on aluminum surface by UV reflection photography
    LIU Tao, YANG Ming, TAO Dai-qin
    Forensic Science And Technology. 2014, 39(3): 12-14.
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    Sweat fingerprints on the aluminum surface were developed by UV reflection photography and it was found that the development results were varied with the different incidence angle of UV light. The explanation about this phenomenon and suggestions when use this method to develop fingerprints on aluminum surface were given by author.
  • Extraction of total RNA from rat myocardium by using Trizol
    DAI Xian-cheng, CHAI Zhi-feng, XU Yong-cheng, WANG Shan-qing
    Forensic Science And Technology. 2014, 39(3): 15-16.
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    Objective To explore extraction method of RNA from rat myocardium and provide reference for forensic medicine.Methods RNA were extracted from rat myocardium with Trizol and analyzed with spectrophotometer, gel electrophoresis and RT-PCR.Results Total RNA of rat myocardium was obtained successfully.Conclusion Trizol method is effective for extracting total RNA from rat myocardium and can be used in forensic medicine field.
  • Application of PolyCyano UV powder in fingerprint development
    LI Kang, HU Kai, LI Xiao-jun, CHANG Bon-ian
    Forensic Science And Technology. 2014, 39(3): 17-19.
    Abstract ( ) Download PDF HTML   Knowledge map Save
    Fingerprints on different types of non-porous objects, including glass, metal, porcelain, plastic and enamel, were developed by using PolyCyano UV Powder (Foster+Freeman Ltd.). The results showed that fingerprints on most smooth objects can be developed effectively.
  • Genetic polymorphism of 18 short tandem repeat loci in the Hans of Gansu province
    WANG Le, ZHAO Xing-chun, ZHANG Jian, WANG Feng, BAI Xue, OU Yuan, WANG Chao-qun, YE Jian
    Forensic Science And Technology. 2014, 39(3): 20-23.
    Abstract ( ) Download PDF HTML   Knowledge map Save
    Objective To determine the frequencies and parameters of 18 short tandem repeat loci (D5S818, D21S11, D7S820, CSF1PO, D2S1338, D3S1358, vWA, D8S1179, D16S539, Penta E, TPOX, TH01, D19S433, D18S51, FGA, D6S1043, D13S317, D12S391) of Han population in Gansu province.Methods PCR amplification and capillary electrophoresis technologies were employed to determine the genotypes of 18 STR loci for 272 individuals.Results 202 alleles were recognized, with frequencies ranged from 0.002 to 0.570. No departures from Hardy-Weinberg expectations were detected for all 18 loci studied (P>0.05). The statistical analysis of 18 STR loci showed the heterozygosity is higher than 0.599, the discrimination power is higher than 0.771, the polymorphic information content is higher than 0.534, and the probability of paternity exclusion is higher than 0.290.Conclusion This work not only studied the genetic polymorphism of 18 short tandem repeat loci in Gansu province, but also introduced the DNATyperTM19 kit into genetic polymorphism studies and reported relevant parameters of the DNATyperTM19 kit.
  • Simultaneous detection of 17 kinds of abused drugs by LC-MS
    ZHAI Wan-feng, ZHANG Chun-shui, GAO Li-sheng
    Forensic Science And Technology. 2014, 39(3): 24-25.
    Abstract ( ) Download PDF HTML   Knowledge map Save
    Objective To establish a method for simultaneous detection of 17 kinds of abused drugs.Methods The separation was performed on a Shim-pack XR-ODS column (100mm×2.0mm, 2.2μm), using acetonitrile(B)-water(A) with 0.3% formic acid as mobile phase. The gradient elution procedure was 0min~3min~8min~15min~20min,3%B~18%B~23%B~93%B~93%B. The interface voltage, scan speed, nebulizing gas flow, drying gas flow was set at 5kV, 3750u/sec, 1.5L/min, 10L/min respectively.Results 21 compounds in 17 kinds of abused drugs gained good seperative efficiency and mass respond. The limits of detection (S/N≥3) were 1.9pg/μL-40.0pg/μL under scan mode.Conclusion This method was rapid, simple, effective and suited for simultaneous detection of unkown drug samples.
  • The development of forensic linguistics
    HUANG Wen-lin
    Forensic Science And Technology. 2014, 39(3): 26-28.
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    In this paper, the development of forensic linguistics, including the history of forensic linguistics, the research achievements, the challenges that forensic linguistics confronts in the information era, and the research trends was discussed.
  • The quality requirements of forensic toxicological test methods
    WANG Fang-lin, ZHANG Yun-feng, WANG Jiong, CHANG Jing, YU Zhong-shan
    Forensic Science And Technology. 2014, 39(3): 29-32.
    Abstract ( ) Download PDF HTML   Knowledge map Save
    This article through carries on the generalized analysis to 73 medical examiner poison inspection procedure, sets the quality requirement from in the technical method quality coefficient to the method establishment and the confirmation. Namely, from the perspective of internal quality and external quality toxicology tests method in forensic science field, elaborates its functionality, reliability, ease-of-use and effectiveness of four dimensional requirements.

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