This article shares practical cases of conical collectors in blood stain extraction, demonstrating their efficacy in forensic crime scene and lab blood evidence processing.
Practical Case Details
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Crime Scene Scenario: A homicide case with dried blood stains on a textured wooden floor—traditional swabs struggled with uneven surface contact.
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Collector Application: Conical collectors (narrow tip + graduated base) were used to target stain edges; 100μL of extraction buffer was dispensed, and the conical tip guided liquid to saturate the stain without runoff.
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Outcome: Extracted DNA yield was 30% higher than swabs; the collector’s base prevented buffer spillage, avoiding cross-contamination of adjacent areas.
Key Advantages in Cases
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Targeted Extraction: Narrow conical tip reaches crevices in textured surfaces (wood, fabric, metal).
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Controlled Buffer Use: Graduated base ensures precise buffer volume, reducing waste and runoff.
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Higher Yield: Optimized liquid-stain contact improves DNA recovery from dried/aged blood.
Application Scope
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Forensic Crime Scenes: Dried blood on uneven/textured surfaces (floors, weapons, clothing).
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Lab Analysis: Post-scene processing of blood-stained evidence for DNA profiling.
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Cold Cases: Extraction from old, degraded blood stains where yield is critical.