Phenol-Chloroform DNA Extraction: Protocol, Troubleshooting, and Safety

Phenol-chloroform DNA extraction is a liquid-liquid phase separation method that partitions nucleic acids from proteins and other cellular debris using organic solvents. This protocol remains relevant in diagnostic and research laboratories because it is inexpensive, scalable, and effective for diverse sample types including blood, tissue, cultured cells, insects, and fungi. The method requires careful handling of hazardous chemicals, strict attention to phase boundaries, and systematic quality checks to produce DNA suitable for PCR, sequencing, and other downstream applications. This article provides a complete working protocol, troubleshooting guidance for common failures, safety controls, and documentation practices for laboratory professionals.

At a Glance

Phenol-chloroform extraction separates DNA from contaminants based on differential solubility. When mixed with cell lysate, phenol denatures proteins and dissolves lipids, while chloroform stabilizes the organic phase and removes residual phenol from the aqueous layer. DNA remains in the upper aqueous phase, proteins partition into the organic phase or interphase, and RNA can be removed with RNase treatment or retained depending on the extraction pH. The table below summarizes key decisions for common applications.

The single-step acid guanidinium thiocyanate-phenol-chloroform method has been widely adopted for RNA isolation because it separates RNA from DNA under acidic conditions, with total RNA remaining in the upper aqueous phase while DNA and proteins stay in the interphase or lower organic phase [6]. For DNA extraction, neutral pH conditions keep DNA in the aqueous phase while proteins are denatured and partitioned into the organic layer.

Core Principles of Phase Separation

Chemical Basis of Partitioning

Phenol is a weak acid that denatures proteins by disrupting hydrogen bonds and hydrophobic interactions. When phenol is mixed with an aqueous cell lysate and centrifuged, the mixture separates into distinct phases based on density and polarity. The aqueous phase sits on top, the organic phenol phase settles at the bottom, and denatured proteins accumulate at the interface between the two layers. DNA, being highly polar and negatively charged, remains dissolved in the aqueous phase under neutral pH conditions.

Chloroform serves two functions in this system. First, it increases the density of the organic phase, making phase separation more complete and easier to visualize. Second, it removes residual phenol from the aqueous phase because phenol is more soluble in chloroform than in water. This reduces phenol contamination in the final DNA preparation, which is important because phenol inhibits downstream enzymatic reactions including PCR and restriction digestion.

pH Determines Nucleic Acid Partitioning

The pH of the phenol solution determines whether DNA or RNA remains in the aqueous phase. At neutral pH, both DNA and RNA partition into the aqueous phase. At acidic pH, DNA is protonated and becomes less polar, causing it to partition into the organic phase or interphase while RNA remains in the aqueous phase. This principle underlies the acid guanidinium thiocyanate-phenol-chloroform method for RNA isolation, where the acidic conditions separate RNA from DNA [6].

Laboratories performing both DNA and RNA extractions must maintain separate stocks of neutral and acidic phenol. Cross-contamination of phenol stocks can compromise extraction specificity. Label all phenol solutions clearly with pH and date of preparation, and verify pH before each use.

Role of Chaotropic Agents

Guanidinium thiocyanate is a chaotropic agent that denatures proteins and inactivates nucleases. In the single-step RNA isolation method, guanidinium thiocyanate is combined with sodium acetate, phenol, and chloroform to create conditions that separate RNA from DNA and proteins [6]. For DNA extraction, chaotropic agents are less commonly used, but they can be incorporated into lysis buffers for samples with high nuclease activity, such as pancreatic tissue or certain bacterial species.

Safety Controls and Laboratory Practices

Hazard Assessment

Phenol is corrosive and can cause severe chemical burns on contact with skin or eyes. Chloroform is a volatile organic solvent that is harmful if inhaled and is a suspected carcinogen with prolonged exposure. Both chemicals require handling in a certified chemical fume hood with appropriate personal protective equipment including nitrile gloves, laboratory coat, and safety goggles.

The World Health Organization Laboratory Biosafety Manual provides guidance on risk assessment and safe handling of hazardous chemicals in laboratory settings [2]. Laboratories should conduct a site-specific risk assessment before implementing phenol-chloroform extraction and document the hazards, exposure routes, and control measures.

Engineering Controls

Perform all steps involving phenol or chloroform in a chemical fume hood. The hood must be certified and maintained according to institutional requirements. Do not rely on biological safety cabinets for organic solvent work because these cabinets recirculate air and do not adequately remove chemical vapors.

Automation can reduce operator exposure to organic solvents. A dual-arm anthropomorphic robot has been programmed to perform phenol-chloroform extraction from cell lysates, achieving routine extraction of high molecular weight genomic DNA from diverse biological samples including algae, bacteria, whole insects, and human cell lines [7]. While robotic systems are not available in all laboratories, this approach demonstrates that automation can limit researcher exposure to organic solvents while maintaining extraction quality.

Waste Disposal

Collect phenol and chloroform waste in designated hazardous waste containers. Do not pour organic solvents down laboratory sinks. Segregate halogenated and non-halogenated organic waste according to institutional and local regulations. Phenol waste must be neutralized or disposed of through licensed hazardous waste contractors.

Emergency Response

Post emergency procedures for chemical exposure in the extraction area. In case of skin contact with phenol, remove contaminated clothing and rinse the affected area with copious amounts of water for at least 15 minutes. For eye exposure, irrigate with water or sterile saline for at least 15 minutes and seek immediate medical attention. Chloroform inhalation requires moving the affected person to fresh air and seeking medical evaluation if symptoms persist.

Step-by-Step Protocol for Genomic DNA Extraction

Sample Preparation and Lysis

The lysis step releases DNA from cells and tissues while protecting it from nucleases. Sample preparation varies by source material. For whole blood, mix the sample with lysis buffer containing SDS and proteinase K to digest proteins and disrupt cell membranes. For tissue samples, homogenize the tissue in lysis buffer using a mechanical homogenizer or mortar and pestle. For bacterial cells with resistant cell walls, additional mechanical disruption may be required.

A liquid nitrogen and mortar approach has been developed for lysing Staphylococcus aureus, which has a peptidoglycan layer resistant to common treatments. This method uses liquid nitrogen and mechanical disruption in a mortar, followed by phenol-chloroform extraction and precipitation, and circumvents the need for costly enzymatic lysis with lysostaphin [10]. The resulting DNA was suitable for PCR amplification of different genes.

For yeast and fungi, cell wall digestion is often required before lysis. Traditional methods use enzymatic digestion or hazardous chemicals, but a non-enzymatic salting-out method has been developed that avoids phenol and chloroform entirely [8]. This alternative may be appropriate for laboratories seeking to reduce organic solvent use.

Phase Extraction

After lysis, add an equal volume of phenol-chloroform-isoamyl alcohol (25:24:1) to the lysate. The isoamyl alcohol reduces foaming and improves phase separation. Mix by inverting the tube gently for 10 to 20 seconds. Do not vortex, because vigorous mixing can shear high molecular weight DNA.

Centrifuge the mixture at 12,000 times gravity for 10 to 15 minutes at room temperature or 4 degrees Celsius. After centrifugation, three layers should be visible: the upper aqueous phase containing DNA, the interphase containing denatured proteins, and the lower organic phase containing phenol and chloroform.

Carefully transfer the aqueous phase to a fresh tube using a wide-bore pipette tip. Avoid disturbing the interphase, because protein contamination in this layer will carry over into the DNA preparation. If the interphase is disturbed, repeat the extraction with fresh phenol-chloroform to remove residual protein.

Purification and Precipitation

After the final phase extraction, add an equal volume of chloroform alone to the aqueous phase to remove residual phenol. Mix gently and centrifuge as before. Transfer the aqueous phase to a fresh tube.

Precipitate DNA by adding 0.1 volumes of 3 molar sodium acetate (pH 5.2) and 2 to 2.5 volumes of ice-cold absolute ethanol. Mix by inversion and incubate at minus 20 degrees Celsius for at least 30 minutes or at minus 80 degrees Celsius for 15 minutes. Centrifuge at 12,000 to 15,000 times gravity for 15 to 20 minutes at 4 degrees Celsius to pellet the DNA.

Wash the pellet with 70 percent ethanol to remove residual salts and organic solvents. Centrifuge briefly, remove the ethanol, and air-dry the pellet for 5 to 10 minutes. Do not over-dry, because completely dry DNA pellets are difficult to resuspend. Resuspend the DNA in TE buffer (10 mM Tris, 1 mM EDTA, pH 8.0) or nuclease-free water.

RNA Removal

For genomic DNA applications requiring RNA-free preparations, add RNase A to a final concentration of 20 to 50 micrograms per milliliter during the lysis step or after resuspension. Incubate at 37 degrees Celsius for 30 minutes. If RNase is added after resuspension, repeat the phenol-chloroform extraction and ethanol precipitation to remove the enzyme.

Options and Tradeoffs

Phenol-Chloroform versus Commercial Kits

Commercial DNA extraction kits offer standardized protocols, reduced handling of hazardous chemicals, and faster processing times. However, they are more expensive per sample than phenol-chloroform extraction. A comparison of phenol-chloroform and a commercial kit for identifying bloodmeal sources from triatomines found that both methods produced reliable sequences for identifying the bloodmeal source, but they differed greatly in cost and time required [11]. The phenol-chloroform method was much less expensive but took considerably more time to perform.

The choice between methods depends on laboratory priorities. High-throughput diagnostic laboratories may prefer commercial kits for speed and standardization. Research laboratories processing large numbers of samples on limited budgets may choose phenol-chloroform extraction despite the additional time and safety requirements.

Alternative Organic Solvent-Free Methods

Several organic solvent-free extraction methods are available for laboratories seeking to reduce hazardous chemical use. A modified salting-out method for yeast and fungi uses high salt concentrations instead of organic solvents for protein precipitation [8]. This method produced high-quality DNA from Saccharomyces cerevisiae, Hansenula polymorpha, Candida albicans, and Aspergillus flavus, with integrity and purity verified by agarose gel electrophoresis and spectrophotometry.

An automated protocol for genomic DNA extraction from Saccharomyces cerevisiae uses magnetic beads, ethanol washing, and elution, avoiding phenol, chloroform, glass beads, and boiling [9]. This method extracts DNA with high efficiency from both liquid cultures and colonies grown on agar plates.

For field applications, a Chelex-based technique has been used to extract malaria parasite and vector DNA from field-collected mosquito specimens [12]. Chelex resin binds metal ions that can degrade DNA and is simpler and more affordable than organic extraction methods.

Sample-Specific Considerations

Different sample types present unique challenges for phenol-chloroform extraction. Plant tissues with high phenolic compound content, such as nutmeg, can reduce DNA recovery and produce suboptimal absorbance ratios due to contamination by RNA and proteins [21]. Modified extraction protocols or commercial kits may be necessary for such samples.

Long-term stored samples require special consideration. A rapid phenol-chloroform protocol has been used to extract genomic DNA from whole blood stored for 15 to 30 years at minus 20 degrees Celsius, demonstrating the utility of this method for genetic epidemiology studies [27]. Ancient samples can also be processed with phenol-chloroform protocols, though DNA is typically fragmented and requires careful handling [28].

Quality Assessment and Measurements

Spectrophotometric Analysis

Measure DNA concentration and purity using a spectrophotometer or microvolume instrument. The A260/A280 ratio indicates protein contamination, with pure DNA typically showing a ratio of 1.8. Lower ratios suggest protein or phenol contamination. The A260/A230 ratio indicates contamination by chaotropic salts, carbohydrates, or organic solvents, with acceptable values typically above 1.5.

In a comparison of extraction methods for triatomine bloodmeal identification, 12 of 15 samples extracted with a commercial kit and 4 of 15 samples extracted with phenol-chloroform were pure according to the A260/A280 ratio [11]. This finding highlights the importance of careful technique in phenol-chloroform extraction to minimize protein carryover.

Gel Electrophoresis

Run an aliquot of the extracted DNA on an agarose gel to assess integrity and molecular weight. High molecular weight genomic DNA should appear as a single high molecular weight band with minimal smearing. Smearing indicates degradation, while a bright band at the gel front suggests RNA contamination. Automated phenol-chloroform extraction has achieved routine extraction of high molecular weight genomic DNA greater than 100 kilobases from diverse biological samples, verified by pulse-field electrophoresis size analysis [7].

Fluorometric Quantification

For downstream applications requiring precise DNA quantification, such as next-generation sequencing library preparation, use fluorometric methods with DNA-binding dyes. These methods are more specific for double-stranded DNA than spectrophotometric methods and are less affected by contaminants.

Functional Validation

The ultimate quality check is functional performance in downstream applications. PCR amplification of target genes confirms that the DNA is free of inhibitors and suitable for enzymatic manipulation. Restriction enzyme digestion confirms that the DNA is accessible to enzymes and free of modifications that block cleavage.

Records and Documentation

Extraction Records

Maintain detailed records for each extraction batch, including sample identification, source material, lysis conditions, extraction dates, reagent lot numbers, and operator identification. Record quality metrics including DNA concentration, A260/A280 ratio, A260/A230 ratio, and gel electrophoresis results. This documentation supports troubleshooting and quality assurance.

The World Health Organization Laboratory Quality Management System Handbook emphasizes the importance of documentation in ensuring reliable laboratory results [1]. Standardized record keeping enables laboratories to identify trends, trace errors, and demonstrate compliance with quality standards.

Reagent Tracking

Track phenol and chloroform lot numbers and expiration dates. Phenol can oxidize over time, turning pink or brown, which indicates degradation. Oxidized phenol should be discarded because it can damage DNA. Record the pH of phenol solutions at preparation and periodically during storage.

Equipment Calibration

Calibrate pipettes, centrifuges, and spectrophotometers according to institutional schedules. Document calibration dates and results. Inaccurate pipettes can introduce systematic errors in reagent volumes, affecting extraction efficiency and reproducibility.

Common Failure Patterns and Troubleshooting

Low DNA Yield

Low yield can result from incomplete cell lysis, loss of DNA during phase transfer, or inefficient precipitation. Verify that the lysis buffer is freshly prepared and that proteinase K is active. Check that the centrifuge speed and duration are adequate for complete phase separation. Ensure that ethanol precipitation is performed at the correct temperature and duration.

For samples with resistant cell walls, such as Staphylococcus aureus, mechanical disruption with liquid nitrogen and mortar may be necessary to achieve adequate lysis [10]. For yeast and fungi, enzymatic digestion of the cell wall may be required before lysis.

Protein Contamination

Protein contamination is indicated by a low A260/A280 ratio and a thick interphase during extraction. Repeat the phenol-chloroform extraction to remove residual protein. Ensure that the aqueous phase is transferred carefully without disturbing the interphase. Use fresh phenol-chloroform for the repeat extraction.

Phenol Carryover

Phenol contamination is indicated by a low A260/A230 ratio and inhibition of downstream enzymatic reactions. Perform an additional chloroform-only extraction to remove residual phenol from the aqueous phase. Ensure that the DNA pellet is washed thoroughly with 70 percent ethanol to remove residual organic solvents.

DNA Shearing

DNA shearing produces smearing on gel electrophoresis and is caused by vigorous mixing, vortexing, repeated pipetting, or freeze-thaw cycles. Mix samples by gentle inversion instead of vortexing. Use wide-bore pipette tips for transferring high molecular weight DNA. Minimize the number of freeze-thaw cycles by aliquoting DNA stocks.

RNA Contamination

RNA contamination appears as a low molecular weight smear on gel electrophoresis and can be detected by an elevated A260/A280 ratio above 2.0. Treat the DNA preparation with RNase A and repeat the purification steps. For genomic DNA applications, include RNase A in the lysis buffer to digest RNA during extraction.

Phase Emulsion

Emulsion formation during phase extraction prevents clean phase separation and can trap DNA in the organic phase. This problem is more common with samples containing high lipid content or when mixing is too vigorous. Centrifuge at higher speed or for longer duration to resolve the emulsion. Add additional chloroform to break the emulsion.

Inconsistent Results Between Batches

Batch-to-batch variability can result from reagent degradation, pH drift in phenol stocks, or operator technique differences. Standardize the protocol with written procedures and checklists. Verify reagent quality before each extraction batch. Train all operators using the same protocol and assess competency with quality metrics.

Limitations and Interpretation

Sample Type Limitations

Phenol-chloroform extraction is not equally effective for all sample types. Samples with high polysaccharide content, such as certain plant tissues, can coprecipitate with DNA and inhibit downstream applications. Samples with high lipid content can form emulsions that complicate phase separation. Samples with very low DNA content, such as degraded forensic samples, may require specialized protocols or alternative methods.

A protocol for extracting DNA from atmospheric bioaerosol samples collected on glass-fiber filters initially used phenol-chloroform purification but was later modified to exclude hazardous chemicals using SPRI paramagnetic bead technology [14]. The updated protocol was effective for a relatively high mass ratio of biological material to filter material but was not effective for lower mass ratios, demonstrating that phenol-chloroform methods may be more sensitive for challenging samples.

Quality Metric Limitations

Spectrophotometric ratios provide indirect measures of purity and can be misleading. The A260/A280 ratio is affected by pH and the presence of contaminants that absorb at 280 nanometers. The A260/A230 ratio can be influenced by residual guanidinium thiocyanate, which absorbs at 230 nanometers. Fluorometric quantification and functional assays provide complementary information about DNA quality.

Cost and Time Considerations

Phenol-chloroform extraction is inexpensive in terms of reagent costs but requires more hands-on time than commercial kits. A comparison of methods for triatomine bloodmeal identification found that the phenol-chloroform method was much less expensive but took considerably more time to perform [11]. Laboratories must weigh these factors when selecting extraction methods.

Alternative Methods for Specific Applications

For some applications, DNA extraction can be avoided entirely. Direct blood PCR has been used to detect venous thromboembolism associated mutations without DNA extraction, with results in 100 percent concordance with conventional genotyping [25]. This approach eliminates extraction time and cost but is limited to specific assays that tolerate blood components.

Professional Escalation Criteria

When to Seek Technical Support

Escalate to a senior scientist, laboratory manager, or technical support when troubleshooting does not resolve the issue. Specific triggers include persistent low yields across multiple batches, unexplained contamination that affects downstream results, or quality metrics that consistently fall outside acceptable ranges.

When to Validate Alternative Methods

If phenol-chloroform extraction consistently fails for a specific sample type, validate an alternative method. The modified salting-out method for fungi [8], the automated magnetic bead method for yeast [9], or commercial kits may produce better results for challenging samples. Document the validation process, including side-by-side comparisons of yield, purity, and functional performance.

When to Review Safety Procedures

Review safety procedures when there are changes in personnel, equipment, or facilities. Conduct a new risk assessment if the extraction volume increases, if new sample types are introduced, or if the ventilation system is modified. Report any chemical exposures or near misses according to institutional policy.

When to Consult Published Protocols

For specialized applications, consult published protocols for guidance. Protocols are available for extracting DNA from ancient samples [28], from whole blood stored for extended periods [27], and from heat-treated food products [29]. These protocols provide sample-specific modifications that may improve results.

Frequently Asked Questions

Why is my DNA yield lower than expected?

Low yield most often results from incomplete lysis, loss of the aqueous phase during transfer, or inefficient precipitation. Confirm that proteinase K is active and that lysis conditions are appropriate for your sample type. Check that the centrifuge speed and time are adequate for complete phase separation. Verify that ethanol precipitation is performed at the correct temperature and that the pellet is recovered completely after centrifugation.

How can I tell if my DNA is contaminated with phenol?

Phenol contamination is indicated by a low A260/A230 ratio, typically below 1.5, and by inhibition of PCR or restriction digestion. The DNA solution may also have an unusual odor. Perform an additional chloroform-only extraction to remove residual phenol, and wash the DNA pellet thoroughly with 70 percent ethanol.

What causes the interphase to be cloudy or thick?

A thick interphase indicates high protein content in the sample. This is normal for protein-rich samples such as blood or tissue. Repeat the phenol-chloroform extraction to remove additional protein. If the interphase remains thick after repeated extractions, consider using a larger volume of phenol-chloroform or an alternative protein removal method.

Can I use phenol-chloroform extraction for RNA isolation?

Yes, but the pH of the phenol must be acidic. The acid guanidinium thiocyanate-phenol-chloroform method separates RNA from DNA under acidic conditions, with total RNA remaining in the upper aqueous phase while DNA and proteins stay in the interphase or lower organic phase [6]. Use acidic phenol specifically prepared for RNA extraction and follow a validated RNA protocol.

How long can I store extracted DNA?

DNA resuspended in TE buffer can be stored at 4 degrees Celsius for short-term use or at minus 20 degrees Celsius for long-term storage. Avoid repeated freeze-thaw cycles, which can shear high molecular weight DNA. For DNA extracted from long-term stored blood, a rapid phenol-chloroform protocol has been shown to yield DNA suitable for genetic epidemiology studies [27].

What is the difference between phenol-chloroform and salting-out extraction?

Phenol-chloroform extraction uses organic solvents to denature and remove proteins, while salting-out methods use high salt concentrations to precipitate proteins. A non-enzymatic salting-out method for fungi avoids hazardous chemicals and produces high-quality DNA from various fungal species [8]. Salting-out methods are safer but may be less effective for samples with high protein or lipid content.

Why does my DNA smear on the agarose gel?

Smearing indicates DNA degradation or shearing. Degradation can result from nuclease activity during lysis, while shearing can result from vigorous mixing, vortexing, or repeated pipetting. Use gentle inversion for mixing, wide-bore pipette tips for transfer, and minimize freeze-thaw cycles. For samples with high nuclease activity, increase the proteinase K concentration or add nuclease inhibitors to the lysis buffer.

When should I choose a commercial kit instead of phenol-chloroform extraction?

Choose a commercial kit when processing time is critical, when hazardous chemical handling is not feasible, or when standardized protocols are required for regulatory compliance. Commercial kits are more expensive per sample but require less hands-on time. A comparison of methods for triatomine bloodmeal identification found that both approaches produced reliable sequences but differed greatly in cost and time [11]. Consider your laboratory budget, throughput, and safety infrastructure when making this decision.

Related Diagnostic Guides

• Phenol-Chloroform Extraction of Nucleic Acids: Principles and Protocol
• Ethanol Precipitation of DNA: Protocol and Troubleshooting
• Southern Blotting Protocol: Step-by-Step Guide for DNA Detection
• Agarose Gel Electrophoresis for DNA Analysis: Protocol and Troubleshooting
• DNA Extraction from Blood Spots: Dried Blood Spot Protocol

References and Further Reading

• Laboratory Quality Management System Handbook. World Health Organization.
• Laboratory Biosafety Manual. World Health Organization.
• Assay Guidance Manual. National Center for Advancing Translational Sciences.
• Bioanalytical Method Validation Guidance. U.S. Food and Drug Administration.
• NCBI Literature Resources. National Center for Biotechnology Information.
• The single-step method of RNA isolation by acid guanidinium thiocyanate-phenol-chloroform extraction: twenty-something years on.. Nature protocols, 2006.
• Automated phenol-chloroform extraction of high molecular weight genomic DNA for use in long-read single-molecule sequencing.. F1000Research, 2022.
• Modified Phenol/Chloroform-Free DNA Isolation from Yeast and Other Fungi by Non-Enzymatic Salting Out Method.. Current protocols, 2023.
• Automation protocol for high-efficiency and high-quality genomic DNA extraction from Saccharomyces cerevisiae.. PloS one, 2023.
• Optimized DNA extraction protocol for Staphylococcus aureus strains utilizing liquid nitrogen.. Revista Argentina de microbiologia, 2025.
• Comparison of phenol-chloroform and a commercial deoxyribonucleic acid extraction kit for identification of bloodmeal sources from triatomines (Hemiptera: Reduviidae).. Revista da Sociedade Brasileira de Medicina Tropical, 2020.
• A simple Chelex protocol for DNA extraction from Anopheles spp.. Journal of visualized experiments : JoVE, 2013.
• RNA Extraction from Plant Tissue with Homemade Acid Guanidinium Thiocyanate Phenol Chloroform (AGPC).. Current protocols, 2022.
• Evaluation of commercial kits and purification approaches for DNA extraction from atmospheric samples for 3rd generation sequencing without amplification.. 2026.
• Protocol to generate endothelial cell-specific knockout mouse models using Cas9/Cdh5-Cre mice coupled with sgRNA.. 2026.
• Salivary RANKL and OPG gene expression quantification during intermaxillary elastic traction in orthodontic patients.. 2026.
• Protocol for capturing the RNA-binding proteome from plants using orthogonal organic phase separation.. 2025.
• Protocol to analyze steps of ribosome biogenesis in nuclear and cytosolic fractions of yeast cells.. 2026.
• DNA extraction from a maize (Zea mays L.) seed without damaging germination ability. Plant Biotechnology, 2025.
• Nondestructive automated DNA extraction method from the tooth root surface.. Forensic Science International, 2025.
• Optimization of Genomic DNA Extraction Method on Nutmeg (Myristica fragrans Houtt.). Biology, Medicine, &amp, Natural Product Chemistry, 2025.
• Modification of a commercial DNA extraction kit for safe and rapid recovery of DNA and RNA simultaneously from soil, without the use of harmful solvents. MethodsX, 2015.
• Enhanced Efficiency of PrepFiler™ BTA DNA Extraction Kit with PrepFiler™ Lysis Buffer Top-Up over Sample Remnants. Forensic Sciences, 2022.
• Microbial DNA Analysis in the Field Using a Biological Extraction Field Kit and a Field qPCR Unit.. Journal of Visualized Experiments, 2026.
• Direct blood PCR: TaqMan-probe based detection of the venous thromboembolism associated mutations factor V Leiden and prothrombin c.20210G>A without DNA extraction.. Clinica chimica acta, international journal of clinical chemistry, 2019.
• A comparative evaluation of DNA yield, purity and integrity from different body segments of Apis mellifera using phenol-chloroform and commercial extraction. Uludag Aricilik Dergisi, 2026.
• Genomic DNA extraction from whole blood stored from 15- to 30-years at -20 °C by rapid phenol-chloroform protocol: A useful tool for genetic epidemiology studies. Molecular and Cellular Probes, 2011.
• A phenol-chloroform protocol for extracting DNA from ancient samples. Methods in Molecular Biology, 2012.
• Optimization of DNA extraction from heat-treated beef broth for bovine identification using urea-phenol-chloroform and salting-out methods. Iop Conference Series Earth and Environmental Science, 2026.

This article is educational and does not replace validated laboratory procedures, institutional biosafety review, manufacturer instructions, or professional interpretation.