DNA synthesis of high-quality dsDNA fragments


dsDNA fragments

Get to research fast with DNA synthesis of fragments designed for performance.

Order double-stranded, linear DNA fragments up to 2.5 kbp with industry leading fidelity across the full range of sequence lengths.

From €0.12 /bp

DNA synthesis for faster downstream applications

Doulix DNA synthesis provides linear, double-stranded DNA fragments up to 2.5 kbp and with industry leading fidelity. Designed for easier gene cloning, modification and applications including CRISPR/CAS editing, antibody development and more.

  • Fragment synthesis up to 2.5 kbp.
  • Industry leading fidelity – 1:10,000 oligo synthesis error rates.
  • Complexity as standard
  • From €0.12 /bp

Your dsDNA fragments arrive optimized for your application of choice.

We’ve spent two years training neural networks to solve synthesis and assembly problems with real world experiments. Our tools now allow for greater first-time application success, on even complex sequences.

  • Comprehensive optimisation for cloning and manufacture.
  • Scarless assembly optimisation.
  • Codon optimisation and troubleshooting as standard.
  • Average two colonies for sequence perfect clone.

DNA synthesis is conducted according to rigorous ISO 9001:2008 standards. Sequences are verified for accuracy via Gel Electrophoresis and for purity by UV absorption. We send nothing unless it passes QC; quality and function is our promise.

We’re so confident we won’t let you down, we’ll back it with a promise- The Doulix quality promise- if it’s not perfect, you don’t pay a thing.

  • Gel Electrophoresis and purity controls.
  • ISO 9001:2008 certified.
  • Doulix Quality Promise or your money back.

Our turnaround time may not be the fastest in the industry, but for good reason. Quality requires time and the additional error correction and rigorous quality controls we perform ensure it.

Average turnaround on DNA synthesis is 11 days (and improving). But what counts is that with a greater than 90% as promised delivery success, it’s arriving when we say so. With synthesis you can rely on, you can be ready to go the moment your sample arrives.

  • Average 11-day turnaround time.
  • Lyophilized, linear dsDNA fragments.
  • Choose your purity grade from research level to endotoxin free.
  • Add ons available for one stop shopping.
  • Customs and shipping handling included.

high-throughput DNA synthesis workflows

dsDNA fragment error rates

High fidelity. Zero waste.

Enjoy industry leading fidelity on all our DNA synthesis, our rigorous error correction ensures it.

With an error rate as low as 1:10,000 means less time and money wasted on screening and failed cloning.

average n colonies screened for sequence perfect clone by length (bp)

Success as standard

Your fragments are comprehensively optimised and enzymatically corrected during synthesis. This ensures higher first time cloning success and more efficient screening downstream.

Which means a lower cost to prototype and more time on the research that counts.


delivery in 2020

DNA synthesis you can rely on.

Between our experts, synthesis technology and error correction capabilities we tackle even the toughest sequences, meaning when you click order, you can rely on us to deliver.

Cloned Fragments

Custom Constructs


Cutting-edge synthesis services and world class support at prices to help you scale research with DNA.


Pre-purchase your DNA and save with the Doulix X-card while simplifying ordering for your whole lab.

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We’ve partnered with top service providers to bring you everything you need to work effectively in one place.

Shorter development and faster discovery with DNA from Doulix.

See what your lab can do when you when you trust your DNA to us. Put us to the test with our Quality Promise: a 100% functional product or your money back.

So yeah sure, you can keep thinking those experiments are impossible. Or you can challenge us with your toughest requests for none of the risk.

Get in touch

Planning a particularly tough project? Want to talk strategy or find the perfect part?

Speak to one of our experts, we’ll get you the answer you need in a jiffy.

Doulix plasmid assembly support expert