title: Black and green tea--how to make a perfect crime.
abstract: The antioxidant properties of the black and green tea are well known. The latent bloodstains are detectable by luminol. The bloodstains also can be cover up by drinks and foods containing the antioxidants; thus their presence can cause a decrease of the luminol light emission (false-negative results). The aim of this study was to quantify the light emission decrease of the chemiluminescent mixture prepared according to Weber (containing NaOH) and the chemiluminescent mixture of pH 7.4 (for the determination of the total antioxidant capacity) for the open air-dried sample. The black and green teas and white wine were used as the antioxidant's samples (high and low total antioxidant capacity). The significant decrease of the luminol chemiluminescent emission caused by the presence of the black and green teas (and comparable for both of them) was observed in comparison with the presence of white wine.
authors.affiliation: Faculty of Medicine, Department of Medical Chemistry and Biochemistry, Palacky University, Hnevotinska 3, 775 15 Olomouc, Czech Republic. martina.bancirova@upol.cz
authors.forename: Martina
authors.initials: M
authors.lastname: Bancirova
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D001801:Blood Stains; D005188:False Negative Reactions; D006801:Humans; D049449:Luminescence; D049408:Luminescent Agents; D008163:Luminescent Measurements; D008165:Luminol; D013662:Tea / Q000737:chemistry*; D014920:Wine
chemical_list: D000975:Antioxidants; D049408:Luminescent Agents; D013662:Tea; D008165:Luminol
keywords: Black and green tea; Bloodstain detection; False-negative detection; Luminol