Development of a modified p-dimethylaminocinnamaldehyde solution for touch DNA analysis and its application to STR analysis

Publication date: Available online 12 October 2018Source: Forensic Science International: GeneticsAuthor(s): Ryohei Yano, Osamu Shimoda, Takaaki Okitsu, Makoto Sakurada, Yasuhiro UenoAbstractWe developed an acid-free p-dimethylaminocinnamaldehyde (DMAC) solution containing silicone oil that was suitable for spraying on clothing for analysis of biological samples such as touch DNA. We investigated the effect of this solution and irradiation with blue light emitting diode (LED) light on short tandem repeat (STR) analysis. To examine the effect of adding acid to the DMAC solution on visualizing biological samples, saliva sample was deposited on T-shirt. The T-shirt was sprayed with acid-added DMAC or acid-free DMAC solution and left for 2 h before irradiation with the blue LED light. We observed no differences between the fluorescence intensities achieved with these two solutions. To examine the effect of acid addition to the DMAC solution on STR analysis, sweat samples were smeared on glass slides and dried. The slides were sprayed with acid-added or acid-free DMAC solution and irradiated with the blue LED light. Samples were collected from the slides with swabs, and DNA was extracted from each sample using a PrepFiler Express™ Forensic DNA Extraction Kit and quantified using a Human DNA quantification kit (Takara RR281). The extracted DNA was amplified using an AmpFℓSTR® Identifiler® Plus PCR Amplification Kit for STR typing. We found that addition of acid to DMAC had ...
Source: Forensic Science International: Genetics - Category: Forensic Medicine Source Type: research