[Detection of saliva traces using test strips]

Area of Science:

• Biochemistry
• Forensic Science

Context:

• The accurate identification of biological fluids is crucial in forensic investigations.
• Salivary amylase is a key biomarker for saliva identification.
• Existing methods for amylase detection can be time-consuming or require specific laboratory conditions.

Purpose:

• To evaluate the suitability of the Rapignost-Amylase test strip for determining salivary alpha-amylase in biological stains.
• To assess the stability and reliability of the test strip for samples stored under typical conditions.

Summary:

• The Rapignost-Amylase test strip, typically used for urine alpha-amylase, effectively detects salivary alpha-amylase in stains stored up to six weeks at room temperature.
• Stains are extracted with saline, and a positive reaction is indicated by a reddish-violet color change on the strip.
• The method is rapid (under 30 minutes), uncomplicated, and distinguishes salivary amylase from lower concentrations found in other biological fluids.

Impact:

• Provides a simple, accessible, and stable method for identifying salivary stains in forensic biology.
• Offers a practical alternative to traditional clinical methods for saliva detection when stain storage is within 4-6 weeks.
• Enhances the efficiency of forensic analysis by enabling rapid on-site or preliminary testing.