Multiple free-radical scavenging (MULTIS) capacity in cattle serum

Area of Science:

• Biochemistry
• Analytical Chemistry
• Comparative Physiology

Background:

• Free radicals contribute to oxidative stress implicated in various diseases.
• Serum contains numerous components with potential antioxidant properties.
• Understanding species-specific differences in antioxidant capacity is crucial.

Purpose of the Study:

• To quantify and compare the multiple free-radical scavenging (MULTIS) activity in cattle and human sera.
• To investigate the role of albumin in the observed scavenging activities.
• To elucidate species-specific differences in serum antioxidant capacity.

Main Methods:

• Electron spin resonance (ESR) spectroscopy was employed to measure scavenging rates.
• Scavenging activity was quantified against six reactive oxygen and nitrogen species.
• Comparative analysis included sera from beef cattle, fetal calves, and human volunteers.

Main Results:

• Cattle sera demonstrated significantly higher MULTIS activity than human sera across most tested radical species.
• Specifically, cattle serum showed 2.6-fold higher scavenging of superoxide anion and 3.7-fold higher scavenging of methyl radical.
• Albumin was identified as a major contributor to MULTIS activity in cattle serum, but not in human serum.

Conclusions:

• Cattle serum possesses a more potent free-radical scavenging capacity than human serum.
• Albumin is a primary determinant of antioxidant activity in bovine serum.
• The observed differences in MULTIS activity are not explained by variations in uric acid levels.