earticle

영어

In cases of sexual assault, the transfer of biological fluids between the assailant and victim provides investigators with valuable evidence of physical contact between the suspect and victim. However, with increasing public awareness of the identifying properties that their high evidential value, particularly that of DNA, sexual assailants may seek to avoid such transfers and render the evidence inaccessible. No matter how, the use of a condom lubricating substance produces its own associated trace evidence, and the detection and identification of such residues can provide valuable intelligence information as well as potential forensic evidence in court. In general, the silicone-based lubricants are the most commonly encountered lubricant on condoms. The detection of silicon oils in swab evidence smeared the victim’s vagina allows the possibility of being sexually harassed with the use of a condom. In this study, the new technique for analysis of condom lubricants without any solvent extraction was carried out using EGA-MS and MS-GC/MS, and the results were compared with that from the conventional method. According to the EGA-thermogram pattern, MSGC/ MS was applied to the sample and more simple chromatograms than ones using Py-GC/MS could be obtained as volatile compounds and pyrolyzed products could be analyzed separately. The results of this work demonstrated that the presence of condom lubricants in forensic evidence could be simply screened by EGA-MS without any solvent extraction. MS-GC/MS results also supplied the detailed information not only for the silicone oils and other additives but also for the condom rubber materials, which could not be easily approached by other conventional methods.