Can a Cost-Effective Alternative to the Leading SPRI Bead-Based Reagent deliver reliable DNA recovery?

Part 2: Comparing MagBio’s HighPrep PCR across multiple Bead-to-Sample Ratios

Saving money on PCR clean-up beads sounds attractive, but not if it comes at the expense of DNA recovery or purification performance.

For sequencing laboratories considering a new SPRI bead-based reagent, the questions are practical:

Will DNA recovery decrease? Will the fragment profile change? And will the reagent behave consistently when the bead-to-sample ratio changes?

These questions matter because bead-to-sample ratio plays an important role in DNA binding, DNA recovery, purification, and size selection.

A dependable magnetic bead purification reagent therefore needs to perform across the different conditions laboratories may use for PCR product cleanup, DNA purification, NGS library preparation, and selective DNA fragment cleanup.

In Part 1, we examined the potential cost savings associated with HighPrep PCR.

Now we turn to performance.

Testing HighPrep PCR across four bead ratios

HighPrep PCR was evaluated against a leading SPRI bead-based reagent using 1,250 ng DNA input at four bead-to-sample ratios: 1.8x, 1.0x, 0.9x, and 0.8x.

The evaluation examined:

  • Recovered DNA yield
  • DNA recovery percentage
  • Gel-based DNA purification profiles
  • Changes in fragment retention as the bead ratio decreased

Using several bead ratios is important because a reagent that performs well at one ratio does not automatically demonstrate the same behavior under more selective conditions.

 

What does the Gel visualization demonstrate?

Gel Visualization of Purification and Selective Size Selection of DNA

Yield measurements show how much DNA was recovered.

Gel visualization helps answer another important question:

Did the purification and fragment-selection behavior remain comparable?

Across the tested bead ratios, HighPrep PCR and the Leading SPRI bead-based reagent showed broadly comparable DNA purification and selective size-selection profiles.

As the bead-to-sample ratio decreased, both reagents showed the expected shift in fragment retention.

The corresponding lanes remained similar at each tested ratio, indicating comparable ratio-dependent behavior under the conditions evaluated.

That is relevant for laboratories working with:

  • PCR products
  • Amplicons
  • Fragmented DNA
  • NGS libraries
  • DNA cleanup workflows
  • Bead-based DNA size selection

Recovered DNA yield across four bead ratios

Comparison of Recovered Yield across Bead Ratios - HighPrep PCR vs. Leading SPRI Bead-Based Reagent

Across all four tested ratios, HighPrep PCR delivered recovered DNA yields closely comparable to the Leading SPRI bead-based reagent.

HighPrep PCR produced slightly higher recovered yields at:

  • 1.8x: 1,015 ng vs. 975 ng
  • 0.9x: 892.5 ng vs. 880 ng
  • 0.8x: 842.5 ng vs. 782.5 ng

At the 1.0x ratio, the difference was only 5 ng.

The important takeaway is not simply which reagent produced the higher number at an individual ratio. It is the consistency of the overall pattern.

Across the conditions tested, both reagents demonstrated closely matched DNA recovery behavior.

 

DNA recovery rate across four bead ratios

The recovery percentages showed the same trend.

Comparison of Recovery Rate across Bead Ratios - HighPrep PCR vs. Leading SPRI Bead-Based Reagent

HighPrep PCR delivered DNA recovery rates ranging from 67.4% to 81.2% across the four bead ratios.

At 1.8x, 0.9x, and 0.8x, recovery was slightly higher with HighPrep PCR in this evaluation.

At 1.0x, the two reagents differed by only 0.4 percentage points.

Both reagents also showed decreasing recovery as the bead ratio decreased, consistent with increasingly selective DNA-binding conditions.

 

What does this mean for an NGS laboratory?

A lower-cost magnetic bead reagent only creates value if it can perform reliably in the workflow.

In this evaluation, HighPrep PCR provided:

  • Comparable recovered DNA yields
  • Reliable DNA recovery
  • Similar gel-based purification profiles
  • Ratio-dependent selective DNA fragment retention
  • Consistent performance across 1.8x, 1.0x, 0.9x, and 0.8x bead ratios

Combined with the approximately 46% lower reagent cost in the 500 mL list-price comparison discussed in Part 1, the data supports a broader question for high-throughput laboratories:

Could your PCR cleanup reagent cost less while still providing the purification performance your workflow requires?

Up next in Part 3: The Complete Comparison

Cost tells one part of the story. Performance tells another.

 

In Part 3, we bring the two together and look at HighPrep PCR from the perspective that matters most when evaluating a new reagent:

Can it fit into an existing PCR cleanup or NGS library preparation workflow while delivering the performance and economics needed for routine use?

We’ll bring together cost, DNA recovery, bead-ratio performance, size-selection behavior, and workflow compatibility to provide the complete comparison.

 

Quick Links

 

 

Kindly Note: Performance data shown are based on the stated experimental conditions using 1,250 ng DNA input. Results may vary depending on sample type, fragment distribution, workflow conditions, instrumentation, and laboratory-specific protocols.