Comparative aspects of buffering capacity in muscle

Area of Science:

• Biochemistry
• Physiology
• Animal Science

Background:

• High buffer value in muscle is often associated with high work performance.
• The specific buffering mechanisms in avian muscle require further investigation.

Purpose of the Study:

• To examine the relationship between buffer value and work performance in chicken breast muscle.
• To investigate the role of dipeptides and metabolic acids in muscle pH regulation.

Main Methods:

• Analysis of buffer value in chicken breast muscle.
• Quantification of carnosine and anserine content.
• Hypothetical modeling of intracellular pH regulation through metabolic acid concentration changes.

Main Results:

• The generalization linking high buffer value to high work performance does not apply to chicken white breast muscle.
• High buffer value in chicken breast muscle is attributed to elevated levels of carnosine and anserine.
• A hypothesis suggests muscle can regulate intracellular pH via glycolytic and citric acid cycle acids, with no energy cost.

Conclusions:

• Chicken breast muscle's buffering capacity is influenced by specific dipeptides, not solely by work performance metrics.
• Muscle possesses a potential energy-independent mechanism for intracellular pH homeostasis involving metabolic pathways.