Generating Microdroplet Array on Photonic Pseudo-paper for Absolute Quantification of Nucleic Acids

Area of Science:

• Biotechnology
• Molecular Diagnostics
• Assay Development

Background:

• Accurate quantification of nucleic acids is crucial for diagnostics.
• Existing methods often require complex and expensive equipment.
• There is a need for rapid, cost-effective nucleic acid detection platforms.

Purpose of the Study:

• To develop a novel digital nucleic acid assay platform.
• To enable absolute quantification of target nucleic acids using microdroplet arrays.
• To demonstrate the platform's efficacy for detecting Staphylococcus aureus DNA.

Main Methods:

• Utilizing a pseudopaper photonic nitrocellulose substrate with tunable hydrophilic-superhydrophobic properties.
• Dividing aqueous samples into hundreds of microdroplets for loop-mediated isothermal amplification (LAMP).
• Employing fluorescence detection of calcein produced during LAMP to count positive microdroplets.

Main Results:

• Absolute quantification of Staphylococcus aureus DNA was achieved with copy numbers ranging from 1 to 1000.
• The platform successfully detected target nucleic acids without sophisticated microfluidic devices.
• Photonic nitrocellulose enhanced fluorescence signals, reducing amplification time.

Conclusions:

• The proposed microdroplet array platform offers a promising approach for digital nucleic acid assays.
• This method provides a rapid, cost-effective, and sensitive solution for bioanalytical applications.
• The technology has the potential for widespread use in diagnostics and research.