Presoaking dried blood spot with water improves efficiency for small-molecule analysis

Area of Science:

• Biochemistry
• Analytical Chemistry
• Biomedical Science

Background:

• Current small molecule extraction from dried blood spots (DBSs) and liquid blood share similarities.
• Differences in physical characteristics necessitate method modifications for DBS analysis.
• Conventional protein precipitation is standard but may not be optimal for DBS.

Purpose of the Study:

• To develop and validate a modified extraction method for small molecules from DBSs.
• To compare the efficiency of a novel water presoaking method against conventional protein precipitation.
• To assess recovery rates and extraction efficiencies for small-molecule analysis in DBS.

Main Methods:

• A modified extraction method involving a water presoaking step for DBSs was developed.
• The modified method was compared to the conventional protein precipitation method.
• Blood and DBS samples from eight subjects were analyzed using both methods.
• Quantitative analysis assessed similarities, recovery rates, and extraction efficiencies.

Main Results:

• The modified method demonstrated superior performance in small-molecule extraction from DBSs.
• Seven out of ten conditions in the modified method group achieved nearly 100% recovery.
• Six out of ten conditions in the modified method group achieved nearly 100% extraction efficiency.
• The modified method showed significantly better results compared to the conventional method.

Conclusions:

• A presoaking step in water is essential for efficient small-molecule extraction from DBSs.
• The proposed modified method enhances recovery and extraction efficiency for DBS analysis.
• This optimized method provides a more accurate approach for analyzing small molecules in DBS samples.