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Updated: May 23, 2026
Development of a Quantitative Recombinase Polymerase Amplification Assay with an Internal Positive Control
Published on: March 30, 2015
Effect of presumptive tests reagents on human blood confirmatory tests and DNA analysis using real time polymerase
Juliana Piva de Almeida1, Nadine Glesse, Cristina Bonorino
1Laboratório de Perícias, Instituto Geral de Perícias do Estado do Rio Grande do Sul, Avenida Azenha, 255 CEP 90160-000 Porto Alegre, Rio Grande do Sul, Brazil. juliana-almeida@igp.rs.gov.br
Abstract:
Bloodstains often constitute the major physical evidence in crime investigation. Diluted blood invisible to the naked eye can be detected through presumptive tests however such tests can damage samples and prevent further processing such as DNA analysis. In this study, we compared the effects of luminol (prepared according to Weber [15]), Luminol 16(®), Bluestar(®) and benzidine for inhibition in the human antiglobulin test and the human hemoglobin immunochromatographic test and on the total human DNA concentration up to 120 days after sample treatment. Treatment with both luminol solutions and Bluestar(®) still allowed positive results for the immunologic tests, indicating non-interference with human blood confirmatory tests. However, samples treated with benzidine could not be further analyzed by serological tests. Also, DNA quantification showed that 48h after benzidine treatment, but not luminol or Bluestar solution application, sample DNA was degraded. Luminol 16(®) caused DNA degradation already at 30 days post-application. At 120 days post treatment, all samples treated with any of the agents but not untreated samples had DNA degradation.
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