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Applying Catching-by-Polymerization for the Preparation of Long Sequence-Defined Polymers.

Zhaozheng Yang1, Ala Covas1, Quentin Combe1

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Catching-by-polymerization (CBP) effectively purifies synthetic polymers by anchoring them in a hydrogel. This method successfully isolated previously unobtainable long poly(phosphodiester) chains.

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Area of Science:

  • Polymer Chemistry
  • Biotechnology
  • Materials Science

Background:

  • Catching-by-polymerization (CBP) is an emerging DNA purification technique.
  • CBP relies on covalently anchoring target sequences within a hydrogel matrix.
  • The applicability of CBP to non-biological polymers required investigation.

Purpose of the Study:

  • To evaluate the efficacy of Catching-by-polymerization (CBP) for purifying synthetic poly(phosphodiester)s.
  • To demonstrate CBP's capability in isolating long polymer chains.
  • To adapt CBP for non-biological polymer synthesis and purification.

Main Methods:

  • Automated solid-phase synthesis of poly(phosphodiester)s using a model phosphoramidite monomer.
  • Attachment of a custom CBP linker containing a polymerizable methacrylamide terminus.
  • Incorporation into a hydrogel via radical copolymerization with acrylamide comonomers.
  • Purification by washing away uncapped chains, followed by detritylation for polymer release.

Main Results:

  • CBP successfully purified poly(phosphodiester)s synthesized via automated solid-phase methods.
  • The technique effectively removed defective, capped polymer chains.
  • Longer chains, including 150-mer and 170-mer poly(phosphodiester)s, were isolated for the first time.
  • Analysis by HPLC and Mass Spectrometry confirmed the purity and length of the isolated polymers.

Conclusions:

  • Catching-by-polymerization (CBP) is a versatile and effective strategy for purifying synthetic polymers.
  • This method simplifies the isolation of long-chain polymers, overcoming previous limitations.
  • CBP offers a straightforward approach for polymer purification across various lengths.