Lyophilization as an alternative for conservation of equine plasma as a source of immunoglobulin G for neonatal foals.
Authors: Sobral G G, Gomes Neto O C, Lima T C, Carneiro G F
Journal: Journal of equine veterinary science
Summary
# Editorial Summary Failure of passive transfer (FPT) remains a significant health threat to neonates, making accessible plasma products critical for equine practitioners; lyophilization (freeze-drying) offers a potential solution to the logistical challenges of storing and transporting liquid plasma by enabling long-term stability and simplified distribution. Sobral and colleagues collected plasma from six healthy stallions, subjected samples to freeze-drying, then reconstituted them in deionized water to assess whether key immunological components survived the process intact. Immunoglobulin G concentration—the primary defence mechanism foals require—remained stable at 8.9 ± 3.2 g/L fresh versus 7.1 ± 2.2 g/L lyophilized (no significant difference), though total protein and total solids did decline modestly but significantly upon reconstitution (6.6 to 5.7 g/dL, and 7.5% to 6.3%, respectively). For practitioners managing foals with suspected or confirmed FPT, this research validates lyophilized plasma as immunologically sound; however, the small sample size and lack of clinical efficacy data mean further work is needed to establish dosing protocols, shelf-life stability, and real-world outcomes before widespread adoption can be confidently recommended for field use.
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Practical Takeaways
- •Lyophilized equine plasma maintains immunoglobulin G concentrations effectively, making it suitable as a shelf-stable alternative to fresh plasma for treating foals with passive transfer failure
- •The lyophilization process results in minor losses of total protein and solids upon reconstitution, but preserves the critical IgG component needed for foal immunity
- •This technology could improve accessibility and reduce costs of plasma therapy in equine practice by simplifying storage and shipping logistics
Key Findings
- •IgG concentration was preserved after lyophilization (8.9 ± 3.2 g/L fresh vs 7.1 ± 2.2 g/L lyophilized; P > 0.05)
- •Total protein decreased significantly from 6.6 ± 0.5 g/dL to 5.7 ± 0.2 g/dL after lyophilization (P < 0.05)
- •Total solids decreased from 7.5 ± 0.8% to 6.3 ± 0.5% after lyophilization (P < 0.05)
- •Lyophilized plasma offers a practical alternative for transportation and storage of immunoglobulin G for foal treatment