Time-dependent changes of sperm cells in human ejaculate samples added in various liquid media

Area of Science:

• Forensic Science
• Sperm Cell Analysis
• Water Chemistry

Background:

• Water exposure can reduce sperm cell detectability on sexual assault victims.
• Water's chemical and biological properties influence sperm detection.
• Previous research has not extensively studied different water types' impact on sperm detectability.

Purpose of the Study:

• To investigate the detectability of sperm cells in vitro across different water types.
• To analyze the influence of time and dilution factors on sperm detection in various water samples.

Main Methods:

• Ejaculate samples from 30 volunteers were used after informed consent.
• Samples were diluted to 50 million sperm cells/mL and then diluted by 20% in distilled, tap, sea, and river water.
• Daily sperm counts were performed to assess detectability over time.

Main Results:

• Sperm cells were detectable for longer durations in tap water (up to 1128 h) and distilled water (up to 1008 h).
• Detectability was shorter in sea water (up to 888 h) and river water (up to 792 h).
• Time-dependent changes in sperm count varied significantly based on water type and dilution.

Conclusions:

• In vitro findings provide insights into sperm cell persistence in different water environments.
• Results highlight the importance of water type in forensic investigations involving potential water exposure.
• Further research is needed to correlate in vitro results with in vivo scenarios.