The isoelectric focusing of keratins in hair followed by silver staining.

This research investigated the use of isoelectric focusing method coupled with silver staining for effectively identifying keratins in hair, from multiple species, as a successful alternative to other methods. This technique demonstrated its potential use in forensics, particularly for human hair identification, even though environmental conditions might influence results.

Objective and Methodology

• The study aimed to develop a method combining isoelectric focusing and silver staining to study keratins found in hair for species identification.
• The research utilized hair from various species like dogs, rabbits, horses, cows, guinea-pigs, donkeys, sheep, and cats, with the application of narrow pH ranges particularly in human hair to observe heterogeneity.

Results and Findings

• The combination of isoelectric focusing and silver staining method was determined as effective as two-dimensional electrophoresis and fluorography, other commonly used methods for hair species identification.
• Hair samples from the selected species could be successfully recognized using this technique.
• Crucially for human hair, a degree of heterogeneity was found, indicating variability due to individual differences, or most probably environmental influences affecting the hair.

Implications and Future Applications

• This method offers a viable alternative for hair species identification, providing a different approach with potential efficiency advantages in comparison with traditional methods.
• The heterogeneity found in human hair implies that this technique could potentially be used in forensic science, particularly for circumstances needing human hair identification, assuming researchers can effectively correct for environmental impacts.
• Further research is necessary to understand how environmental conditions could affect the keratins in hair, to make this technique even more reliable in accurate identification and its use in various scientific fields, such as forensics.