The absorbance spectrum of haemoglobin
The team at Venomtech have released an Application Note with BMG LABTECH that discusses their work studying the effect of different snake venoms on mammalian haemoglobin. They found that the venom from different species of snake had varying effects on the absorbance spectrum of rabbit haemoglobin when measured at 0 hours and after 16 hours.
Venom taken from snakes in the Viperidae family had the strongest effect on the haemoglobin; at 0 hours the absorbance spectrum showed 2 peaks characteristic of oxyhaemoglobin (HbO2). Following treatment, the spectrum shifted to indicate the presene in the sample of methaemoglobin (oxidised haemoglobin) rather than oxyhaemoglobin.
A similar technique has been used in a completely different field to investigate the use of haemoglobin spectra to determine the age, and so time of deposition, of bloodstains at a crime scene. Studies have looked at the shift in the wavelength of a characteristic peak in the haemoglobin absorbance spectrum of dried bloodstains left for differing periods of time. Comparing this to this to the time since deposition has shown that it is possible to determine this to within hours.
These studies illustrate two very different applications that one assay can be used for. The use of a plate reader to automate the measurement and data recording of both of these is useful to the researchers to speed up and increase the amount of data acquisition, but would be invaluable were either of these techniques to be used in an industrial environment, such as a forensic laboratory at a crime scene..