Asked by: Oktay Dolescience chemistry
What chemicals are used in the Kastle Meyer test?
Last Updated: 20th February, 2020
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Also to know is, what is the Kastle Meyer test used for?
The Kastle–Meyer test is a presumptive blood test, first described in 1903, in which the chemical indicator phenolphthalein is used to detect the possible presence of hemoglobin.
Similarly, what substances can cause a false positive Kastle Meyer test result? This test has some limitations. Namely, the enzymes in some vegetables (especially tomato, potato, cucumber, horseradish) can cause a false positive test result. Other non-blood substances which give positive results are: some fruit extracts, some metallic substances, or any other peroxidase-like substances.
Beside this, what is Kastle Meyer reagent?
Kastle–Meyer reagent contains reduced phenolphthalein indicator in a basic solution. Simply wipe a presumptive bloodstain with a cotton swab, add a drop of the reagent, and then apply a drop of hydrogen peroxide. If the swab turns pink rapidly, it is positive for blood!
How does phenolphthalein detect blood?
Phenolphthalein (Blood) Phenolphthalein is a presumptive test that reacts with the heme molecule present in blood. A positive reaction gives a pink color. While a positive phenolphthalein reaction is indicative of blood, it is only a presumptive test and false positives are possible.