PCR Steps: Denaturation, Annealing, and Extension Explained

Polymerase chain reaction (PCR) amplifies a specific DNA sequence through repeated cycles of three temperature-controlled steps: denaturation, annealing, and extension. During denaturation, double-stranded DNA separates into single strands. During annealing, primers bind to complementary sequences on those single strands. During extension, a DNA polymerase enzyme builds new DNA from the primers. These three steps repeat for 30 to 35 cycles, and each cycle doubles the amount of target DNA, producing exponential amplification. This article explains what happens at each step, why the temperatures matter, how to optimize cycling conditions, and how to recognize and fix common problems. The content is written for laboratory students, technicians, researchers, and diagnostic professionals who need practical guidance for running reliable PCR assays.

The Role of Thermal Cycling in PCR

PCR depends on precise temperature changes to control each stage of DNA synthesis. The reaction mixture contains template DNA, two primers that flank the target region, a heat-stable DNA polymerase, nucleotide building blocks, and buffer components. The thermal cycler moves the reaction through a programmed sequence of temperatures, and each temperature triggers a specific molecular event.

The use of a heat-stable DNA polymerase from the bacterium Thermus aquaticus made PCR automation practical because the enzyme survives the high temperatures needed to separate DNA strands 12. Before heat-stable polymerases became standard, fresh enzyme had to be added after every denaturation step, which made the process labor-intensive and error-prone.

Each PCR cycle consists of three main steps: template DNA denaturation, primer annealing to complementary sequences, and primer extension to synthesize new DNA strands 6. The target sequence is copied and amplified at an exponential rate because both strands of the original DNA serve as templates for new synthesis 12. After 30 to 35 cycles, a single starting molecule can produce millions of copies of the target region 21.

The common temperature choices for the three steps are approximately 94 degrees Celsius for denaturation, 60 degrees Celsius for annealing, and 70 degrees Celsius for extension 10. These values are starting points, not universal constants. The optimal temperatures depend on the primer sequences, the DNA polymerase, the buffer composition, and the characteristics of the template DNA.

At a Glance: The Three PCR Steps

The table below summarizes the three main PCR steps, their typical temperatures, what happens at each stage, and why each step matters for successful amplification.

The temperatures in this table are typical starting values. The annealing temperature is usually calculated from the melting temperatures of the primers, and the extension temperature is set according to the optimal activity of the specific DNA polymerase being used 10.

Denaturation: Separating the DNA Strands

Denaturation is the first step of each PCR cycle. The reaction is heated to a high temperature, typically 94 to 98 degrees Celsius, to break the hydrogen bonds that hold the two strands of the DNA double helix together 10. This produces single-stranded DNA molecules that can serve as templates for primer binding and extension.

Why Denaturation Temperature Matters

The denaturation temperature must be high enough to separate the DNA strands completely but not so high that it damages the DNA polymerase or other reaction components. Most standard PCR protocols use a denaturation temperature of 94 to 95 degrees Celsius. The initial denaturation step before the first cycle is often longer, typically 2 to 3 minutes, to ensure that all template DNA is fully separated, especially for genomic DNA samples that may contain complex secondary structures.

The denaturation temperature during subsequent cycles can often be shorter, usually 15 to 30 seconds, because the amplicons produced in earlier cycles are shorter and easier to separate than the original genomic template 13. Some fast PCR protocols use denaturation times as short as 1 second per cycle 7.

Challenges with GC-Rich Templates

DNA templates with high guanine-cytosine (GC) content can be difficult to denature because GC base pairs form three hydrogen bonds instead of the two found in adenine-thymine pairs. This makes the double-stranded DNA more stable and resistant to separation. Amplification of high GC content genes is a major challenge in PCR because of the difficulty in DNA denaturation and the possibility of forming secondary structures from the DNA templates 8.

For GC-rich templates, several adjustments can help. Increasing the denaturation temperature or extending the denaturation time can improve strand separation. Some protocols use a two-step PCR approach where annealing and extension are combined at a higher temperature, which can improve amplification of GC-rich sequences when used with specific high-fidelity DNA polymerases and reaction enhancers 8. Lowering the ramp speed between temperatures can also help by giving the reaction more time to reach thermal equilibrium.

Denaturation in Fast PCR Protocols

Fast PCR methods reduce amplification time by modifying the denaturation step. One approach uses a lower denaturation temperature with a polymerase that has strand displacement activity. In a strand displacement-based fast quantitative PCR method, the final conditions included an initial denaturation at 92 degrees Celsius for 2 minutes, followed by cycling with a denaturation temperature of 87 degrees Celsius and an annealing and extension temperature of 72 degrees Celsius, with only 1 second at each step 7. This method detected less than 10 copies of DNA and RNA within 25 to 40 minutes.

Another approach, called coamplification at lower denaturation temperature PCR (COLD-PCR), uses a critical denaturation temperature that is lower than standard to selectively amplify minority alleles from mixtures of wild-type and mutation-containing sequences 9. This technique improves the detection of low-level somatic mutations by exploiting small differences in denaturation behavior between sequences that differ by a single nucleotide.

Annealing: Primer Binding to Template DNA

Annealing is the second step of each PCR cycle. The reaction temperature is lowered to allow the primers to bind to their complementary sequences on the single-stranded template DNA 10. The annealing temperature is typically between 50 and 65 degrees Celsius, depending on the melting temperatures of the primers.

How Primers Find Their Targets

During annealing, the two primers in the reaction mixture search for complementary sequences on the template strands. One primer binds to one strand, and the second primer binds to the opposite strand, flanking the target region. The primers are short synthetic oligonucleotides, usually 18 to 25 nucleotides long, that are designed to be complementary to specific sequences in the template DNA.

The annealing temperature is critical for specificity. If the temperature is too high, the primers may not bind at all, resulting in no amplification product. If the temperature is too low, the primers may bind to partially mismatched sequences, producing additional undesired amplified fragments 10. Poorly designed primers can lead to no amplification product or extra bands on the gel.

Calculating Annealing Temperature

The annealing temperature is usually set a few degrees below the melting temperature of the primers. The melting temperature is the temperature at which half of the primer molecules are bound to their complementary sequences. Primer design software calculates melting temperatures based on the nucleotide composition and length of the primers.

Good primer design goals include high specificity, high annealing efficiency, appropriate melting temperature, proper GC content, and prevention of primer hairpins or primer dimers 10. Primers with balanced GC content and no self-complementary regions are more likely to anneal specifically and efficiently.

Annealing in Two-Step PCR

Some PCR protocols combine the annealing and extension steps into a single temperature. This is called two-step PCR because each cycle has only two temperature changes instead of three. In two-step PCR, the annealing and extension temperature is typically set between 60 and 72 degrees Celsius, depending on the primers and the polymerase.

A two-step PCR protocol for detection of Vibrio vulnificus used an initial denaturation at 95 degrees Celsius for 3 minutes, cycling denaturation at 94 degrees Celsius for 15 seconds, and a combined annealing and extension step at 60 degrees Celsius for 5 seconds in each cycle 13. This simplified protocol detected one genomic target per reaction.

Two-step PCR can be faster than three-step PCR because there are fewer temperature transitions per cycle. However, the combined annealing and extension temperature must be compatible with both the primer melting temperatures and the polymerase activity. If the combined temperature is too high for efficient primer binding, the reaction may lose sensitivity.

Extension: DNA Synthesis from Primers

Extension is the third step of each PCR cycle. The DNA polymerase adds nucleotides to the 3-prime end of each annealed primer, synthesizing a new DNA strand that is complementary to the template 10. The extension temperature is typically 68 to 72 degrees Celsius, which is the optimal temperature range for most heat-stable DNA polymerases.

How Extension Works

During extension, the DNA polymerase reads the template strand and adds the complementary nucleotide to the growing primer. The polymerase moves along the template in the 3-prime to 5-prime direction, adding nucleotides one at a time. The extension continues until the polymerase reaches the end of the template or until the reaction conditions change.

The extension time depends on the length of the target amplicon and the processivity of the DNA polymerase. A general rule is to allow approximately 30 to 60 seconds per 500 to 1000 base pairs of amplicon length. Longer amplicons require longer extension times to ensure that the polymerase can synthesize the complete product.

Extension Temperature and Polymerase Activity

The optimal extension temperature depends on the specific DNA polymerase used. Most standard Taq polymerases have optimal activity around 72 degrees Celsius. Some high-fidelity polymerases have optimal activity at slightly different temperatures, and the manufacturer's instructions should be followed.

The extension temperature also affects the accuracy of DNA synthesis. Higher temperatures can reduce the fidelity of some polymerases, while lower temperatures can reduce the processivity and speed of synthesis. The choice of polymerase and extension temperature should balance yield, fidelity, and speed.

Extension in Fast PCR

Fast PCR protocols reduce extension time by using polymerases with high processivity and by optimizing the reaction buffer. In the strand displacement-based fast quantitative PCR method, the annealing and extension steps were combined at 72 degrees Celsius with only 1 second per step 7. This was possible because the strand displacement polymerase efficiently amplifies partial double-stranded DNA at lower denaturation temperatures.

Another rapid PCR approach reduced amplification time from 80 to 30 minutes by using a commercial DNA Taq polymerase with a thermal ramp rate of 2.2 degrees Celsius per second and annealing and extension hold times of 1 second 15. This accelerated PCR workflow detected bacterial targets in less than one hour without compromising technical sensitivity.

PCR Cycling Parameters and Optimization

The success of a PCR reaction depends on the careful selection of cycling parameters. These include the number of cycles, the duration of each step, the ramp rates between temperatures, and the initial and final incubation steps.

Number of Cycles

Most PCR protocols use 30 to 35 cycles 21. The number of cycles determines the final amount of amplified product. Each cycle doubles the amount of target DNA, so 30 cycles can produce over one billion copies from a single starting molecule. However, the amplification efficiency is rarely 100 percent, and the reaction eventually reaches a plateau phase where the accumulation of product slows down.

The optimal number of cycles depends on the initial amount of template DNA and the sensitivity required. Samples with very low template concentrations may need more cycles, while samples with high template concentrations may need fewer cycles to avoid excessive non-specific amplification.

Step Durations

The duration of each step must be long enough for the molecular events to complete but short enough to keep the total reaction time reasonable. The initial denaturation is typically 2 to 3 minutes to ensure complete separation of genomic DNA. Cycling denaturation is typically 15 to 30 seconds. Annealing is typically 15 to 30 seconds. Extension time depends on amplicon length.

Fast PCR protocols use much shorter step durations. Some protocols use 1 second at each cycling step 7. The tradeoff is that very short steps may not allow complete denaturation, annealing, or extension, which can reduce yield and specificity.

Ramp Rates

The ramp rate is the speed at which the thermal cycler changes temperature between steps. Most economical thermal cyclers have ramp rates of 2 to 3 degrees Celsius per second, so a PCR reaction can take 1 to 2 hours 11. Faster ramp rates reduce the total reaction time but can cause temperature overshoot or undershoot, which may affect reaction consistency.

For GC-rich templates, adjusting the ramp speed to a lower rate can improve amplification by giving the reaction more time to reach thermal equilibrium and reducing the formation of secondary structures 8. Some protocols specifically recommend lower ramp speeds for difficult templates.

Initial and Final Steps

Most PCR protocols include an initial denaturation step before the first cycle and a final extension step after the last cycle. The initial denaturation ensures that all template DNA is fully separated before the first annealing step. The final extension, typically 5 to 10 minutes at 72 degrees Celsius, ensures that all partially extended products are completed.

Some protocols also include a final hold at 4 degrees Celsius to preserve the amplified product until the reaction is removed from the thermal cycler.

Practical Workflow for Setting Up a PCR Run

Setting up a PCR run involves several steps that must be performed carefully to ensure reliable results. The workflow below describes the key decisions and actions for a standard PCR experiment.

Step 1: Design and Verify Primers

Primer design is a crucial step for successful PCR 10. Use primer design software to select primers with appropriate melting temperatures, GC content, and specificity. Check the primers for potential hairpins, primer dimers, and non-specific binding sites in the template genome.

Verify the primer sequences against the target genome using a sequence alignment tool. The primers should be complementary to the target sequence with no mismatches at the 3-prime end, because mismatches at this position can prevent extension.

Step 2: Prepare the Reaction Master Mix

Prepare a master mix containing all reaction components except the template DNA. This reduces pipetting errors and ensures consistency across multiple reactions. The master mix typically includes buffer, magnesium chloride, deoxynucleotide triphosphates, primers, DNA polymerase, and water.

Include a no-template control in every PCR run. This control contains all reaction components except template DNA and should produce no amplification product. A positive control with known template DNA should also be included to verify that the reaction components are working correctly.

Step 3: Set Cycling Parameters

Set the cycling parameters based on the primer melting temperatures, the amplicon length, and the DNA polymerase instructions. Start with the manufacturer's recommended conditions and adjust if the initial results are unsatisfactory.

Record the cycling parameters in the laboratory notebook, including the denaturation temperature and time, annealing temperature and time, extension temperature and time, number of cycles, and ramp rates.

Step 4: Run the Reaction

Place the reaction tubes in the thermal cycler and start the program. Monitor the reaction for any errors or alarms. Some thermal cyclers display the progress of the run, including the current temperature and the remaining time.

Step 5: Analyze the Products

After the reaction is complete, analyze the amplified products using gel electrophoresis, real-time fluorescence detection, or another detection method. Compare the results with the positive and negative controls to verify that the amplification was specific and efficient.

Records and Measurements for PCR Quality Control

Accurate record keeping is essential for PCR quality control and troubleshooting. The following records should be maintained for each PCR run.

Reaction Setup Records

Record the date, operator, sample identifiers, primer sequences, reagent lot numbers, and the concentrations of all reaction components. This information is essential for troubleshooting if a reaction fails or produces unexpected results.

Record the thermal cycler used and the cycling program, including all temperatures, times, and ramp rates. Different thermal cyclers can have different temperature calibration, and this can affect the results.

Amplification Results

Record the amplification results, including the presence or absence of product, the size of the amplified fragments, and the intensity of the bands or fluorescence signals. For quantitative PCR, record the cycle threshold values and the calculated quantities.

Record any unexpected results, such as extra bands, smears, or weak amplification. These observations can help identify problems with the reaction conditions or the reagents.

Quality Control Data

Maintain records of the positive and negative control results for each PCR run. A failed positive control indicates a problem with the reaction components or the thermal cycler. A positive no-template control indicates contamination.

The World Health Organization Laboratory Quality Management System Handbook provides guidance on quality assurance practices for diagnostic laboratories, including the use of controls and the documentation of test results 1. Following these practices helps ensure that PCR results are reliable and reproducible.

Common Failure Patterns and Troubleshooting

PCR reactions can fail for many reasons. The following are common failure patterns and the steps to diagnose and correct them.

No Amplification Product

If no product is visible on the gel or no fluorescence signal is detected, check the following possibilities. The template DNA may be degraded, contaminated with inhibitors, or present at too low a concentration. The primers may be degraded, incorrectly designed, or at the wrong concentration. The annealing temperature may be too high for the primers to bind. The polymerase may be inactive or inhibited.

Run a positive control with known template DNA to verify that the reaction components are working. If the positive control works, the problem is likely with the template or the primers. If the positive control fails, the problem is likely with the master mix or the thermal cycler.

Multiple or Smeared Bands

Multiple bands or smeared bands on the gel indicate non-specific amplification. The annealing temperature may be too low, allowing primers to bind to partially mismatched sequences. The primer concentration may be too high. The number of cycles may be too many, allowing non-specific products to accumulate.

Increase the annealing temperature in increments of 1 to 2 degrees Celsius to improve specificity. Reduce the primer concentration or the number of cycles. Check the primer design for potential non-specific binding sites.

Weak Amplification

Weak amplification can result from suboptimal reaction conditions. The extension time may be too short for the amplicon length. The number of cycles may be insufficient. The template concentration may be low. The magnesium concentration may be suboptimal.

Increase the extension time or the number of cycles. Optimize the magnesium concentration by testing a range of concentrations. Verify the template concentration using a spectrophotometer or a fluorometer.

Primer Dimers

Primer dimers are short products formed when the primers bind to each other instead of the template. They appear as a low molecular weight band on the gel or as an early fluorescence signal in real-time PCR. Primer dimers can be reduced by redesigning the primers to avoid complementary regions, increasing the annealing temperature, or reducing the primer concentration.

In real-time PCR, primer dimers can cause overestimation of the target quantity. One study found that detecting the fluorescent signal at a temperature between the melting temperature of the primer dimers and that of the target amplicons eliminated the overestimation of the yield of PCR amplicons due to primer dimers 13.

Safety and Contamination Control in PCR

PCR is a sensitive technique that can amplify a single molecule of DNA. This sensitivity makes contamination a serious concern. Even trace amounts of DNA from previous reactions, from the laboratory environment, or from the operator can contaminate a reaction and produce false positive results.

Preventing Contamination

The World Health Organization Laboratory Biosafety Manual provides guidance on safe handling of biological materials and prevention of laboratory-acquired infections 2. While PCR reagents are not typically infectious, the samples being tested may contain pathogens, and safe handling practices should be followed.

Use separate areas for reaction setup and product analysis. Dedicated pipettes, filter tips, and lab coats should be used for PCR setup. The work surface should be cleaned with DNA decontamination solutions before and after each use.

Controls for Contamination Detection

Include a no-template control in every PCR run. This control contains all reaction components except template DNA. If the no-template control produces amplification, the reagents or the environment are contaminated.

The no-template control should be the last tube to be closed and the first tube to be opened for analysis. This minimizes the chance of contaminating the control with amplified product from the other reactions.

Handling Amplified Products

Amplified PCR products are a major source of contamination. They are present at high concentrations and can easily contaminate pipettes, surfaces, and reagents. Open PCR tubes carefully to avoid creating aerosols. Dispose of amplified products according to the laboratory waste management procedures.

Limitations of PCR and Interpretation of Results

PCR is a powerful technique, but it has limitations that must be considered when interpreting results.

Detection Limits

PCR can detect very small amounts of DNA. Some fast PCR methods can detect less than 10 copies of DNA or RNA 7. However, the detection limit depends on the assay design, the sample quality, and the detection method.

The analytical sensitivity of a PCR assay should be determined during assay validation. The U.S. Food and Drug Administration Bioanalytical Method Validation Guidance provides recommendations for validating the sensitivity, specificity, and reproducibility of analytical methods 4.

Quantification Limitations

Quantitative PCR can estimate the amount of target DNA in a sample, but the accuracy depends on the amplification efficiency and the quality of the standard curve. The amplification efficiency can vary between runs and between samples due to inhibitors or suboptimal reaction conditions.

The National Center for Advancing Translational Sciences Assay Guidance Manual provides recommendations for developing and validating quantitative assays, including the use of standard curves and quality control samples 3.

Interpretation of Results

PCR results should be interpreted in the context of the assay design, the controls, and the clinical or research question. A positive result indicates that the target sequence was detected, but it does not necessarily indicate the presence of a viable organism. A negative result indicates that the target sequence was not detected, but it does not rule out the presence of the organism at a concentration below the detection limit.

The National Center for Biotechnology Information provides literature resources for understanding PCR principles and applications 5. These resources can help laboratory professionals interpret PCR results and troubleshoot problems.

Professional Escalation Criteria

Laboratory professionals should know when to escalate a PCR problem to a supervisor, a senior scientist, or a technical support specialist. The following situations warrant escalation.

Persistent Reaction Failures

If a PCR assay consistently fails despite troubleshooting, escalate the problem. The issue may be with the primer design, the reagent quality, or the thermal cycler calibration. A senior scientist can review the assay design and recommend alternative approaches.

Unexpected Results with Clinical Samples

If a PCR assay produces unexpected results with clinical samples, such as a positive result in a no-template control or a negative result in a positive control, escalate the problem immediately. The results may be unreliable, and patient care decisions should not be based on unverified results.

Equipment Malfunctions

If the thermal cycler produces temperature errors, alarms, or inconsistent results, escalate the problem to the equipment maintenance team. Temperature calibration should be verified regularly, and the thermal cycler should be serviced according to the manufacturer's recommendations.

Contamination Events

If contamination is detected in a PCR run, escalate the problem to the laboratory supervisor. The source of contamination should be identified and eliminated before any further PCR work is performed. This may require cleaning the laboratory, replacing reagents, or implementing new contamination control procedures.

Frequently Asked Questions

What are the three main steps of PCR?

The three main steps of PCR are denaturation, annealing, and extension 6. During denaturation, the double-stranded DNA template is heated to separate it into single strands. During annealing, the temperature is lowered to allow primers to bind to their complementary sequences on the single-stranded template. During extension, the DNA polymerase adds nucleotides to the primers to synthesize new DNA strands 10. These three steps are repeated for 30 to 35 cycles to amplify the target sequence exponentially 21.

What temperature is used for denaturation in PCR?

The typical denaturation temperature is 94 to 98 degrees Celsius 10. Most standard protocols use 94 to 95 degrees Celsius. The initial denaturation before the first cycle is often longer, typically 2 to 3 minutes, to ensure complete separation of genomic DNA. Cycling denaturation is typically 15 to 30 seconds. Some fast PCR protocols use lower denaturation temperatures with specialized polymerases 7.

What temperature is used for annealing in PCR?

The annealing temperature is typically between 50 and 65 degrees Celsius, depending on the melting temperatures of the primers 10. The optimal annealing temperature is usually a few degrees below the primer melting temperature. If the annealing temperature is too high, the primers may not bind. If it is too low, the primers may bind to non-specific sequences.

What temperature is used for extension in PCR?

The extension temperature is typically 68 to 72 degrees Celsius 10. This is the optimal temperature range for most heat-stable DNA polymerases. The extension time depends on the length of the target amplicon. Longer amplicons require longer extension times.

How many cycles are used in a typical PCR reaction?

Most PCR protocols use 30 to 35 cycles 21. Each cycle doubles the amount of target DNA, so 30 cycles can produce over one billion copies from a single starting molecule. The optimal number of cycles depends on the initial template concentration and the sensitivity required.

What is two-step PCR?

Two-step PCR combines the annealing and extension steps into a single temperature, so each cycle has only two temperature changes instead of three 13. The combined annealing and extension temperature is typically between 60 and 72 degrees Celsius. Two-step PCR can be faster than three-step PCR because there are fewer temperature transitions per cycle.

Why is PCR prone to contamination?

PCR is prone to contamination because it amplifies a single molecule of DNA to millions of copies. Trace amounts of DNA from previous reactions, from the laboratory environment, or from the operator can contaminate a reaction and produce false positive results. The World Health Organization Laboratory Biosafety Manual provides guidance on safe handling of biological materials and prevention of contamination 2. Including a no-template control in every PCR run helps detect contamination.

What should I do if my PCR produces no amplification product?

If your PCR produces no amplification product, check the positive control first. If the positive control works, the problem is likely with the template or the primers. If the positive control fails, the problem is likely with the master mix or the thermal cycler. Common causes include degraded template DNA, inhibitors in the sample, incorrect annealing temperature, inactive polymerase, or primer design problems 10.

Related Diagnostic Guides

• Process Controls in PCR: Internal Amplification Controls and Their Role in Validation
• How to Calculate the Annealing Temperature for PCR
• PCR Troubleshooting: No Amplification or Weak Bands
• RT-PCR Troubleshooting: No Amplification or Multiple Bands
• Touchdown PCR: Reducing Nonspecific Amplification

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.
• PCR: Identification of Genetic Polymorphisms.. Methods in molecular biology (Clifton, N.J.), 2017.
• SF-qPCR: Strand Displacement-Based Fast Quantitative Polymerase Chain Reaction.. Biochip journal, 2022.
• PCR procedures to amplify GC-rich DNA sequences of Mycobacterium bovis.. Journal of microbiological methods, 2021.
• Coamplification at lower denaturation temperature-PCR increases mutation-detection selectivity of TaqMan-based real-time PCR.. Clinical chemistry, 2009.
• Designing Polymerase Chain Reaction Primers Using Primer3Plus.. Cold Spring Harbor protocols, 2016.
• A Rapid and Low-Cost PCR Thermal Cycler for Low Resource Settings.. PloS one, 2015.
• The polymerase chain reaction: an improved method for the analysis of nucleic acids.. Human genetics, 1989.
• Thermal factors influencing detection of Vibrio vulnificus using real-time PCR.. Journal of microbiological methods, 2007.
• Garland Rolling Circle Amplification Mediated Self-Priming Extension Strategy for Sensitive and Label-Free &lt,i&gt,Pseudomonas aeruginosa&lt,/i&gt, Analysis in Perioperative Period.. 2026.
• Thermal optimized PCR coupled to CRISPR-Cas12a for rapid detection of blaOXA-1 resistance gene.. 2026.
• A real-time temperature series MICRO-TAG cell target engagement assay using Applied Biosystems QuantStudio system.. 2026.
• Protocol for rapid allelic discrimination qPCR genotyping of the Winnie mouse model.. 2026.
• L-DNA calibrators for PCR amplicon characterization.. 2026.
• Predictive functional profiling of 16S rRNA genes amplicons reveals bioremediation and sulfur metabolism capacity in thermophilic hot spring bacteriomes.. 2026.
• High-fidelity robotic PCR amplification. 2025.
• Assistance in Mastering PCR Methods for Olympiad Students at MAN Insan Cendekia in Kendari City. Majalah Pengabdian Indonesia, 2025.
• SIMULATION BASED DESIGN OF A THERMOELECTRIC COOLER FOR PCR-THERMAL BLOCK. 2021.
• The Concept of Making On-Chip Thermal Cycler for RT-PCR Using Conjugate Heat Transfer in Diverging Microchannel. Transactions of Indian National Academy of Engineering, 2020.
• PCR- Revolutionizing the Diagnostic Approach and Applications in Dentistry: A Review. 2019.
• Amplification of deoxyribonucleic acid (DNA) fragment using two-step polymerase chain reaction (PCR). African Journal of Biotechnology, 2011.
• Impact of thermal performance of PCR on the testing of HBV-DNA. Kung Cheng Je Wu Li Hsueh Pao Journal of Engineering Thermophysics, 2009.
• A method for functional mapping of protein-protein binding domain by preferential amplification of the shortest amplicon using PCR. Analytical Biochemistry, 2002.
• Establishment of a rapid one-step multiplex RT-PCR assay for simultaneous detection of four viruses infecting jasmine. Acta Phytopathologica Sinica, 2024.

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