title: New incompatibilities uncovered using the Promega DNA IQ™ chemistry.
abstract: Over the years, the Promega DNA IQ™ System was proven an effective technology for the production of clean DNA from a wide variety of casework specimens. The capture of DNA using the DNA IQ™ paramagnetic beads, however, was shown to be affected by a few specific chemicals that could be present on exhibits submitted to the laboratory. In this study, various blood and latent fingerprint enhancement reagents/methods, marker pens and adhesive tapes, applied at the crime scene or in the forensic laboratory on casework exhibits or used to collect biological material, were tested for their compatibility with the DNA IQ™ technology. Although no impact on DNA recovery was observed for most reagents, the MAGNA™ Jet Black fingerprint powder and three 3M Scotch(®) adhesive tapes were shown to severely or completely inhibit DNA binding onto the DNA IQ™ beads. The effect of MAGNA™ Jet Black on DNA recovery could be counteracted by separating the magnetic powder from the lysates by centrifugation or filtration, prior to DNA extraction. High quality STR profiles were obtained from samples subjected to MAGNA™ Jet Black suggesting it does not impact DNA integrity.
authors: Policy and Program Support, Forensic Science and Identification Services, Royal Canadian Mounted Police, 1200 Vanier Parkway, Ottawa, ON, Canada. Electronic address: nancy.laurin@rcmp-grc.gc.ca.
authors: Nancy
authors: N
authors: Laurin
authors: National Forensic Laboratory Services-Ottawa, Forensic Science and Identification Services, Royal Canadian Mounted Police, 1200 Vanier Parkway, Ottawa, ON, Canada.
authors: Florence
authors: F
authors: Célestin
authors: National Forensic Laboratory Services-Edmonton, Forensic Science and Identification Services, Royal Canadian Mounted Police, 15707 118e Avenue, Edmonton, AB, Canada.
authors: Meagan
authors: M
authors: Clark
authors: Integrated Forensic Identification Services, Forensic Science and Identification Services, Royal Canadian Mounted Police, 1200 Vanier Parkway, Ottawa, ON, Canada.
authors: Della
authors: D
authors: Wilkinson
authors: Integrated Forensic Identification Services, Forensic Science and Identification Services, Royal Canadian Mounted Police, 1200 Vanier Parkway, Ottawa, ON, Canada.
authors: Brian
authors: B
authors: Yamashita
authors: Policy and Program Support, Forensic Science and Identification Services, Royal Canadian Mounted Police, 1200 Vanier Parkway, Ottawa, ON, Canada.
authors: Chantal
authors: C
authors: Frégeau
mesh_terms: D001774:Blood Chemical Analysis; D004247:DNA / Q000302:isolation & purification*; D016172:DNA Fingerprinting / Q000295:instrumentation*; D003878:Dermatoglyphics; D006801:Humans; D007202:Indicators and Reagents; D007281:Ink; D018895:Microsatellite Repeats; D011208:Powders
chemical_list: D007202:Indicators and Reagents; D011208:Powders; D004247:DNA
keywords: Adhesive tapes; Blood enhancement; DNA IQ™; DNA extraction; DNA typing; Fingerprint enhancement; Forensic science; MAGNA™ Jet Black; Magnetic powder