Ultrasound and sodium hypochlorite method for eliminating free nucleic acids from samples

Overview

This research proposes a dual-technique approach for eliminating free nucleic acids (DNA and RNA) from laboratory and environmental samples without compromising the integrity of the sample. The method combines ultrasonic degradation with sodium hypochlorite (NaOCl) treatment, applied either independently or together, to break down free-floating genetic material. The approach addresses a critical need in molecular biology, clinical diagnostics, forensic science, and biosafety, where unwanted nucleic acid contamination can compromise experimental results or pose biosecurity risks.

The core value proposition is the ability to selectively degrade free nucleic acids while preserving the structural and functional integrity of cells or other sample components. This makes the method suitable for contamination control, biosafety protocols, and pre-analytical sample preparation workflows.

Technical specifications

Key features:

• Ultrasonic degradation: Sonication applies hydrodynamic shearing forces that break hydrogen bonds and cause single-strand and double-strand ruptures in the DNA helix, fragmenting free nucleic acids into small, non-functional pieces
• Sodium hypochlorite oxidation: Bleach (NaOCl) degrades DNA through oxidative damage and production of chlorinated base products, causing strand cleavage at higher concentrations
• Combined or independent use: Both techniques can be applied separately or together depending on the sample type and contamination level
• Sample preservation: The approach targets free nucleic acids specifically, aiming to avoid damage to intact cells or other sample structures
• Dose-dependent control: Effectiveness depends on parameters such as ultrasound power, exposure time, and NaOCl concentration, allowing tunable treatment protocols

How it works:

The method exploits the vulnerability of free, exposed nucleic acid molecules to physical shearing and chemical oxidation. Ultrasound generates microbubbles and shear forces in solution that mechanically fragment free DNA and RNA. Sodium hypochlorite chemically oxidizes the bases and sugar-phosphate backbone, breaking strands into progressively smaller fragments. When used together, the two mechanisms provide complementary degradation pathways.

Technology readiness level

The research is at an early-to-mid stage of development. The team has published prior work on the effects of ultrasound on bacterial inactivation, which informed the understanding of how ultrasound parameters affect biological samples. The laboratory infrastructure at Sesallab R&D and Consultancy Company supports all necessary experimental work, including microbiology and molecular biology analyses. The estimated project duration is 6 to 9 months. The team is seeking financial support and funding for key personnel to complete validation studies and optimize the combined ultrasound-NaOCl protocol for practical application.