KAPA HTP/LTP Library Preparation Kits

KAPA HTP/LTP Library Preparation Kits employ our first-generation “with bead” workflow for DNA library construction. These kits contain optimally formulated enzymes selected through our directed evolution technology
 and offer higher success rates than conventional library construction kits in both high- and low-throughput sample preparation pipelines. 

KAPA HTP/LTP Library Preparation Kits are compatible with most automation platforms and provide a complete library preparation solution together with KAPA Adapters and KAPA Pure Beads. 

For our more streamlined, highly automatable library preparation solution, we would recommend using the KAPA HyperPrep Kits and KAPA HyperPlus Kits. These workflows offer higher conversion of input into library molecules and therefore are particularly well suited for applications with lower inputs and challenging samples such as FFPE-derived DNA. 


Features and Benefits of KAPA HTP/LTP Library Preparation Kits

• Automation-friendly, highly optimized “with-bead” protocol facilitating minimal sample loss with no physical transfer of library material between enzymatic reactions

• Improved coverage uniformity as a result of low-bias library amplification with KAPA HiFi enzyme 

• Compatibility with a wide range of DNA sample types, inputs and sequencing applications, and flexibility with respect to fragment size, adapter design, and library amplification 

• Qualified automation methods


Product Highlights

Greater molecular complexity

  • Higher adapter-ligated library yields, translating to higher library complexity
  • Fewer cycles of amplification needed, resulting in lower PCR duplication rates, which are critical for library construction from lower input and challenging samples

Reduced amplification bias and improved coverage

  • Reduced PCR bias* using KAPA HiFi enzyme
  • Improved coverage uniformity of across the entire range of genomic GC content

Automation with qualified scripts

  • Qualified methods available for major liquid handling platforms used in NGS, such as PerkinElmer Sciclone NGS and NGSx, Beckman Coulter Biomek FXp and FX dual-pod, Agilent Technologies NGS Workstation Option B, and Eppendorf® epMotion 5075 TMX

*Data on file.

Research Use Only. Not for use in diagnostic procedures.
KAPA and SEQCAP are trademarks of Roche. Other product names and trademarks are the property of their respective owners.

Kits can be stored at -20˚C.

Kits include reagents for end repair, A-tailing, ligation and library amplification. PCR-free versions (without library amplification reagent) are also available. “With-bead” kits include PEG/NaCl solution for SPRI bead cleanups.

All 96-library kits are automation friendly.


Spec Description
Compatible Platform
Illumina HiSeq, MiSeq, NextSeq and GAIIx
Library Type
Starting Material
Fragmented DNA or PCR amplicons
Input Amount
100 pg – 5 µg
Sequencing Applications

Whole Genome Sequencing

Whole Exome Sequencing

Targeted Sequencing (custom panels)


Amplicon Sequencing


Research Use Only. Not for use in diagnostic procedures.
KAPA and SEQCAP are trademarks of Roche. Other product names and trademarks are the property of their respective owners.

Research Use Only. Not for use in diagnostic procedures.
KAPA and SEQCAP are trademarks of Roche. Other product names and trademarks are the property of their respective owners.

Kit Code Roche Cat. No
Kit Size (reactions)
How to buy
Low throughput, "with bead"
8 Contact Us
Low throughput, "with bead", PCR-free
8 Contact Us
Low throughput, "with bead"
48 Contact Us
Low throughput, "with bead", PCR-free
48 Contact Us
07961901001 High throughput, "with bead"
96 Contact Us
High throughput, "with bead", PCR free
96 Contact Us

Accessory Products

All KAPA Adapter Kits contain KAPA Adapter Dilution Buffer and three additional sealing films to support multiple use. KAPA Adapter Dilution Buffer (08278539001) is also available separately, if required.

Kit Code Roche Cat. No
Kit Size 
How to buy
KAPA Pure Beads (5 mL)
5 mL Contact Us
KAPA Pure Beads (30 mL)
30 mL
Contact Us
KAPA Pure Beads (60 mL) 60 mL
Contact Us
KK8727 08861919702 KAPA Unique Dual-Indexed Adapters Kit (15 μM) 96 adapters x 20 μL each Contact Us
KAPA Dual-Indexed Adapter Kit, (15 µM)
96 adapters x 20 µl each
Contact Us
KAPA Adapter Dilution Buffer (25 mL)
25mL Contact Us

Research Use Only. Not for use in diagnostic procedures.
KAPA and SEQCAP are trademarks of Roche. Other product names and trademarks are the property of their respective owners.

  • Whole-genome shotgun sequencing
  • Targeted sequencing by solution hybrid selection (i.e. exome or custom capture using the SeqCap EZ, Agilent SureSelect, Illumina TruSeq or IDT xGen Lockdown Probes systems)
  • ChIP-seq
  • RNA-seq
  • Methyl-seq (in combination with the KAPA HiFi Uracil+ ReadyMix)

The kit has been validated for library construction from 10 ng – 5 µg of human genomic DNA for whole-genome shotgun sequencing or targeted sequencing. For smaller genomes, or lower complexity samples such as ChIP DNA successful library construction has been achieved from low nanogram to picogram quantities (≥100 pg) of input DNA.

  • End repair: Produce blunt-ended, 5′-phosphorylated fragments
  • A-tailing: dAMP is added to the 3′-ends of blunt-ended dsDNA library fragments
  • Adapter ligation: dsDNA adapters with 3′-dTMP overhangs are ligated to 3′-A-tailed library fragments
  • Library amplification (optional): Employs PCR to amplify library fragments carrying appropriate adapter sequences on both ends
  • If you are performing a cleanup between shearing and end repair, shear in 10 mM Tris-HCl (pH 8 or 8.5) + 1 mMEDTA.
  • If you are not performing a cleanup between shearing and end repair, shear in 10 mM Tris-HCl (pH 8 or 8.5) + 0.1 mMEDTA.
  • Never shear DNA in water.

The protocol may be paused safely after any of the bead cleanup steps, as described below:

  • After the end repair cleanup, resuspend the washed beads in 20 µL of 1X A-Tailing Buffer without enzyme and store at 4°C for up to 24 hours.
  • After the A-tailing cleanup, resuspend the washed beads in 20 µL of 1X Ligation Buffer (without enzyme or adapter) and store the reactions at 4°C for up to 24 hours.
  • After the first post-ligation cleanup resuspend the washed beads in the appropriate volume of 10 mM Tris-HCl (pH 8.0) and store the reactions at 4°C for up to 24 hours.

The proportion of fragmented DNA that is successfully converted to adapter-ligated molecules decreases as input is reduced. When starting library construction (end repair) with >100 ng fragmented DNA, 15%–40% of input DNA is typically recovered as adapter-ligated molecules, whereas the recovery typically ranges from 0.5%–15% for libraries constructed from 100 pg – 100 ng DNA. These figures apply to high quality DNA and can be significantly lower for DNA of lower quality and for workflows that contain additional  beads cleanups or size selection prior to library amplification.

KAPA Dual- or Single-Indexed Adapters are recommended for use with KAPA Library Preparation Kits, except for methyl-seq applications. KAPA Library Preparation Kits are also compatible with non-indexed, single-indexed, and dual-indexed adapters that are routinely used in SeqCap EZ, Illumina TruSeq, Agilent SureSelect, and other similar library construction and target capture workflows. Custom adapters that are of similar design and are compatible with “TA-ligation” of dsDNA may also be used, remembering that custom adapter designs may impact library construction efficiency.

Ligation efficiency is robust for adapter-insert molar ratios from 10:1 to 50:1. As a general guideline, an adapter-insert molar ratio of ~10:1 is recommended for libraries constructed from ≥100 ng  of fragmented DNA. Higher adapter-insert molar ratios may be beneficial for low-input and challenging samples.

High Concentration (30 µM) KAPA Single-Indexed Adapter Kits are recommended for library construction from from ≥100 µg inputs, whereas Low Concentration (1.5 µM) KAPA Single-Indexed Adapter Kits are recommended for inputs ≤100 ng. Around 100 ng, the most appropriate concentration depends on library insert size. KAPA Dual-Indexed Adapters may be used for all inputs with the appropriate dilution. For assistance with adapter compatibility and ordering, please visit kapabiosystems.com/support.

Please refer to the KAPA Single- and Dual-Indexed Adapter Technical Data Sheets for information about barcode sequences, pooling, kit configurations, formulation, and dilution for different KAPA DNA and RNA library preparation kits and inputs.

KAPA Adapters undergo extensive qPCR- and sequencing-based functional and QC testing to confirm:

  • optimal library construction efficiency
  •  minimal levels of adapter-dimer formation
  • nominal levels of barcode cross-contamination

Library construction efficiency and adapter-dimer formatin are assessed in a low-input library construction workflow. The conversion rate achieved in the assay indicates library construction efficiency. This is calculated by measuring the yield of adapter-ligated library (before any amplification) by qPCR (using the KAPA Library Quantification Kit), and expressing this as a % of input DNA. To assess adapter-dimer formation, a modified library construction protocol— designed to measure adapter dimer with high sensitivity—is used.

Barcode cross-contamination is assessed by sequencing. Each adapter is ligated to a unique, synthetic insert of known sequence, using a standard library construction protocol. These constructs pooled and sequenced on a MiSeq. For every barcode, the number of reads (in the range of 115,000 – 500,000) associated with each insert is counted, and the total % correct inserts calculated. Contamination of any barcode with any other single barcode is guaranteed to be <0.25%. The total level of contamination for any barcode is typically in the range of 0.1 – 0.5%. This assay is unable to distinguish between chemical cross-contamination and adapter “cross-talk”, and measures the total number of incorrect inserts resulting from both phenomena.

While a single bead-based cleanup removes most unligated adapter and adapter-dimer, a second bead-based cleanup is recommended to eliminate any remaining adapter species from the library. If size selection is carried out between adapter ligation and library amplification (or clustering), a single post-ligation cleanup with beads (1X) is usually sufficient prior to size selection. If no post-ligation size selection is carried out, two consecutive 1X bead-based cleanups are recommended.

Size selection requirements vary widely according to specific applications. Depending on preference the double-sided size selection procedures presented in the Library Preparation User Guide may be omitted entirely, modified, or replaced with alternative size selection procedures (such as manual agarose gel electrophoresis, excision and purification or an automated DNA size selection (e.g. Sage Science Pippin Prep). Size selection may be carried out at alternative points in the workflow, for example:

  • Prior to end repair of fragmented DNA
  • Immediately before library amplification (as outlined in the User Guide)
  • After library amplification

KAPA HiFi HotStart is the enzyme provided in the KAPA HiFi HotStart ReadyMix. This is an antibody-based hot-start formulation of KAPA HiFi DNA Polymerase, a novel B-family DNA polymerase engineered for increased processivity and high fidelity.

If cycled to completion, (NOT RECOMMENDED) a single 50 µL library amplification PCR can produce 8 µg – 10 µg (16 ng – 200 ng/µL) of amplified library. To minimize over-amplification and associated undesired artifacts, the number of amplification cycles should be optimized to produce an amplified library with a concentration in the range of 10 ng – 30 ng/µL (0.5 µg – 1.5 µg of PCR product per 50 µL reaction). Quantification of adapter-ligated libraries prior to library amplification can greatly facilitate the optimization of library amplification parameters, particularly when a library construction workflow is first established. With the KAPA Library Quantification Kit, the amount of template DNA (adapter-ligated molecules) available for library amplification can be determined accurately. Using a simple algorithm (for exponential amplification), the number of amplification cycles needed to achieve a specific yield of amplified library may be predicted theoretically. The actual optimal number of amplification cycles may be 1–3 cycles higher, particularly for libraries constructed from FFPE DNA or other challenging samples, or libraries with a broad fragment size distribution.

In library amplification reactions, primers are typically depleted before dNTPs. When DNA synthesis can no longer take place due to substrate depletion, subsequent rounds of DNA denaturation and annealing result in the separation of complementary DNA strands, followed by imperfect annealing to non-complementary partners. This presumably results in the formation of so-called “daisy-chains” or “tangled knots”, comprising large assemblies of improperly annealed, partially double-stranded, heteroduplex DNA. These species migrate slower and are observed as secondary, higher molecular weight peaks during the electrophoretic analysis of amplified libraries.

Excessive library amplification can result in unwanted artifacts such as PCR duplicates, chimeric library inserts, amplification bias and heteroduplex formation. It is generally best to limit the extent of library amplification as much as possible, while ensuring that sufficient material is generated for QC and sequencing.

Library size distribution, and the absence of primer dimers and/or over-amplification products, should be confirmed by means of an electrophoretic method. KAPA Library Quantification Kits are recommended for qPCR-based quantification of libraries.

The enzymes in this kit are temperature sensitive and appropriate care should be taken during shipping. Upon receipt, immediately store enzymes and reaction buffers at -20°C in a constant-temperature freezer. The PEG/NaCl Solution may be stored at 2°C to 8°C until the expiry date indicated on the kit label.

The KAPA HyperPrep Kit and KAPA HyperPlus Kit offer more streamlined, automatable workflow with higher conversion of input into library molecules. This leads to lower duplication rates, increased library diversity and more uniform coverage. As a result, these kits are more suited for low input, challenging samples (e.g. FFPE) than the KAPA HTP/LTP DNA Library Preparation Kits. 

Research Use Only. Not for use in diagnostic procedures.
KAPA and SEQCAP are trademarks of Roche. Other product names and trademarks are the property of their respective owners.