NGS Library Preparation Kits

DNA normalization and Concentration

<h2>What is DNA normalization and concentration for NGS?</h2>
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DNA normalization for NGS is the process of adjusting all individual indexed sequencing libraries to the same molar concentration before pooling them into a single multiplexed sequencing run, so that each library contributes approximately the same number of sequencing reads to the total run output. Concentration may also be needed when a library is too dilute after cleanup or elution. SPRI (solid-phase reversible immobilization) magnetic bead-based cleanup, most commonly using AMPure XP beads, is the standard method for post-library-prep cleanup, size selection, and concentration in NGS workflows.
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<h2 dir="ltr">What you will find:</h2>
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Magbio MagQuant Plus DNA Kit: for automated, high-throughput nucleic acid concentration and normalization workflows
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<h2>How to normalize and concentrate NGS libraries</h2>
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Quantify each library by qPCR to calculate molar concentration accurately
Kapa Library Quantification qPCR kits or equivalent measure the amplifiable, adapter-ligated molecules in a library, providing a molar concentration based on insert size that can be used to pool libraries at equal molar ratios. Fluorometric quantitation gives mass per volume but not molar concentration, and libraries with different insert sizes have different mass-to-moles conversion factors.
Calculate library molar concentration using measured mass and average insert size
If molar quantitation by qPCR is not available, the molar concentration of a library can be estimated from its fluorometric mass concentration and the average insert size from Bioanalyzer or TapeStation: molar concentration (nM) = (mass in ng/&micro;l &times; 10^6) / (insert size in bp &times; 660 g/mol/bp). This converts mass to moles using the average molecular weight per base pair.
Pool indexed libraries at equal molar ratios for balanced depth
After calculating the molar concentration of each library, pool volumes delivering equal moles of each library into the final pool. Even small quantitation errors translate into coverage imbalances between samples in the sequencing output.
Use SPRI bead cleanup to concentrate libraries and remove adapter dimers
SPRI bead cleanup with AMPure XP beads at the appropriate bead-to-sample ratio selects for DNA fragments above a size cutoff while removing smaller adapter dimers and free adapter molecules. The final elution in a smaller volume of buffer concentrates the library. The bead ratio determines the minimum retained fragment size, with higher ratios retaining smaller fragments.
Verify the pooled library before sequencing
After pooling and final SPRI cleanup, measure the pooled library by qPCR and Bioanalyzer to confirm molar concentration and size distribution before loading, since loading concentration determines cluster density and affects sequencing performance.
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<h2>Specifications context</h2>
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AMPure XP SPRI beads use polyethylene glycol and sodium chloride to precipitate DNA onto paramagnetic beads in a size-dependent manner, making the bead-to-sample volume ratio the key parameter for controlling the minimum retained fragment size. As of 2026, automated bead-based normalization kits that combine quantitation and normalization remain available for high-throughput settings, though most academic labs perform manual quantitation and normalization before pooling.
Browse through the catalog and <a href="https://mbpinc.net/contact-us">contact the expert team</a> to book high-quality DNA normalization and concentration products today.

MagQuant_Plus_DNA Kit V2 - Protocol_REV3

Magbio MagQuant Plus DNA Kit V2

MQP-50000 by MagBio Genomics is the MagQuant Plus DNA Kit V2, a magnetic bead kit for DNA normalization and quantitation in NGS, amplicon, and genomic DNA workflows. No centrifugation, no standard curve required; 25–50 µL elution volume; available in 96-, 384-, and 1920-prep sizes.