Fluorescence spectra and measurement of phylloerythrin (phytoporphyrin) in plasma from clinically healthy sheep, goats, cattle and horses.

This research study aimed to determine the baseline concentration of phylloerythrin, a photodynamic compound, in the blood plasma of healthy animals including sheep, goats, cattle, and horses, by using fluorescence spectroscopy.

Research Methodology

• The study was conducted on various animals such as 34 sheep of the Dala breed, 20 female Norwegian dairy goats, 35 Norwegian Red cows and 34 horses consisting of different breeds. All of these animals were on a diet of green pasture.
• Blood samples were also collected from healthy newborns of each species, which were then pooled together to create one sample per species for comparative analysis.
• The plasma samples harvested from these blood samples were subjected to analysis for phylloerythrin.
• This analysis was done using fluorescence spectroscopy, with the help of a Perkin-Elmer LS-50B luminescence spectrometer fitted with a red-sensitive photomultiplier.
• From the fluorescence spectra acquired, the phylloerythrin concentration in plasma from the adult ruminants was compared with those in plasma from the newborn ones, where phylloerythrin had been manually added.

Findings of the Research

• The plasma extracted from the adult ruminants (sheep, goats, and cattle) showed spectral characteristics similar to phylloerythrin, specifically weak emission peaks at 650 and 711 nm, when excited at a wavelength of 425 nm.
• However, the emission spectra derived from the plasma of the neonatal ruminants didn’t show any fluorescence at these wavelengths.
• On an average, varying small concentrations of phylloerythrin were detected in plasma samples from the sheep, goats and cattle.
• The fluorescence spectra of plasma from the newborn foals were found to be similar to spectra from adult horses, but with weak emission at 669 nm.

Conclusion of the Study

• The research was able to detect small concentrations of phylloerythrin substance in plasma derived from clinically healthy sheep, goats and cattle.
• However, no phylloerythrin could be detected in the plasma from the clinically healthy horses, showcasing potential variations in the presence of this compound among different species.