{ "id": "epy76641mk", "slug": "enzymatic-polymerization", "title": "Enzymatic polymerization", "updated": "2026-10-15", "topic_path": [ { "id": "physical", "label": "Physical world and mathematics", "api_url": "https://www.edgepedia.org/api/v1/topics/physical" }, { "id": "physical.chemistry", "label": "Chemistry", "api_url": "https://www.edgepedia.org/api/v1/topics/physical.chemistry" }, { "id": "physical.chemistry.methods", "label": "Chemical principles and methods", "api_url": "https://www.edgepedia.org/api/v1/topics/physical.chemistry.methods" }, { "id": "physical.chemistry.methods.chemical-synthesis", "label": "Chemical synthesis", "api_url": "https://www.edgepedia.org/api/v1/topics/physical.chemistry.methods.chemical-synthesis" }, { "id": "physical.chemistry.methods.chemical-synthesis.polymer-synthesis", "label": "Polymer synthesis", "api_url": "https://www.edgepedia.org/api/v1/topics/physical.chemistry.methods.chemical-synthesis.polymer-synthesis" } ], "geo": [ { "id": "geo.nongeo.t1946.physical.chemistry.methods.chemical-synthesis.polymer-synthesis", "label": "Non-geographic · 1946 to 2000: Polymer synthesis", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical.chemistry.methods.chemical-synthesis.polymer-synthesis", "path": [ { "id": "geo.nongeo", "label": "Non-geographic", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo" }, { "id": "geo.nongeo.t1946", "label": "Non-geographic · 1946 to 2000", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946" }, { "id": "geo.nongeo.t1946.physical", "label": "Physical world and mathematics", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical" }, { "id": "geo.nongeo.t1946.physical.chemistry", "label": "Chemistry", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical.chemistry" }, { "id": "geo.nongeo.t1946.physical.chemistry.methods", "label": "Chemical principles and methods", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical.chemistry.methods" }, { "id": "geo.nongeo.t1946.physical.chemistry.methods.chemical-synthesis", "label": "Chemical synthesis", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical.chemistry.methods.chemical-synthesis" }, { "id": "geo.nongeo.t1946.physical.chemistry.methods.chemical-synthesis.polymer-synthesis", "label": "Polymer synthesis", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical.chemistry.methods.chemical-synthesis.polymer-synthesis" } ] } ], "excerpt": "Enzymatic polymerization is the in vitro synthesis of polymers by isolated enzymes such as lipases and peroxidases, a metal-free route to polyesters, polycarbonates, polyphenols, and polysaccharides.", "snippet": "Enzymatic polymerization is the in vitro synthesis of polymers by isolated enzymes such as lipases and peroxidases, a metal-free route to polyesters, polycarbonates, polyphenols, and polysaccharides.", "node": "physical.chemistry.methods.chemical-synthesis.polymer-synthesis", "markdown": "# Enzymatic polymerization\n\nEnzymatic polymerization is the synthesis of polymers in vitro, outside any living cell, by nonbiosynthetic pathways catalyzed by an isolated enzyme rather than by a metal or organocatalyst.[1](https://pubs.acs.org/doi/full/10.1021/cr0002590) Hydrolases such as lipases and glycosidases, and oxidoreductases such as peroxidases, build polyesters, polycarbonates, polyphosphates, polyphenols, and polysaccharides without toxic metal residues.[1](https://pubs.acs.org/doi/full/10.1021/cr0002590) • [2](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k) The method matters where metal-free products are required.\n\n| Key fact | Detail |\n|---|---|\n| Definition | Chemical synthesis in vitro via nonbiosynthetic pathways catalyzed by an isolated enzyme[1](https://pubs.acs.org/doi/full/10.1021/cr0002590) |\n| Polymer classes | Polyesters, polycarbonates, polyphosphates, polyphenols, polysaccharides[3](https://link.springer.com/chapter/10.1007/12_030) • [4](https://onlinelibrary.wiley.com/doi/10.1002/marc.200800690) |\n| Standard catalyst | Novozym 435: immobilized Candida antarctica lipase B (CALB) on Lewatit VPOC 1600, about 10% (w/w) loading[5](https://www.mdpi.com/2673-6209/2/1/3) |\n| Typical outcome (ε-caprolactone) | Toluene, 70 °C, 4 h: 85% conversion, \\( M_{\\mathrm{n}} \\) 17,000 g/mol; solvent-free, 70 °C, 2 days: \\( M_{\\mathrm{w}} \\) 20,700, PDI 1.45[6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6953973/) • [7](https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra09038b) |\n| Bulk d,l-lactide polymerization | \\( M_{\\mathrm{w}} \\) 270,000 g/mol (PDI 1.1, 16% yield), Pseudomonas cepacia lipase PS, bulk, 130 °C[6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6953973/) |\n| Main failure modes | Hydrolysis from excess water, enzyme deactivation, slow lactide kinetics, limited chain length[6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6953973/) • [2](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k) |\n| Key advantage over Sn(Oct)2 ROP | Metal-free product; no difficult catalyst removal[2](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k) |\n\n## How it works\n\nLipase-catalyzed ring-opening polymerization (eROP) of lactones runs through an acyl-enzyme intermediate. The catalytic site of CALB is the triad Ser105–His224–Asp187: serine attacks the lactone carbonyl, ring-opening gives the acyl-enzyme (the enzyme-activated monomer, EM), and the growing chain's terminal hydroxyl attacks this activated carbonyl in the deacylation step, adding one unit per cycle.[5](https://www.mdpi.com/2673-6209/2/1/3) • [1](https://pubs.acs.org/doi/full/10.1021/cr0002590) Kinetic analysis led Kobayashi to conclude that EM formation is the overall rate-determining step, a monomer-activated mechanism.[1](https://pubs.acs.org/doi/full/10.1021/cr0002590) A later mechanistic analysis attributed rate control to acylation or deacylation depending on the propagating alcohol end structure, so the rate-determining step remains a point of discussion between the two accounts.[8](https://onlinelibrary.wiley.com/doi/10.1002/masy.200650822)\n\nA distinctive feature is monomer reactivity. Under lipase catalysis, larger ring-sized lactones with lower ring strain polymerize faster than medium-ring ones, the reverse of anionic metal-catalyzed ROP, where ring strain governs.[8](https://onlinelibrary.wiley.com/doi/10.1002/masy.200650822) Kobayashi's review states that polymerizability is governed mainly by ring size, contrary to chemical catalysis where ring strain is operative.[1](https://pubs.acs.org/doi/full/10.1021/cr0002590)\n\nOxidative enzymes use a different chemistry. [Horseradish peroxidase](https://www.edgepedia.org/horseradish-peroxidase) (HRP) acts primarily as an oxidative activator, while polymer growth and cross-linking are determined predominantly by monomer structure, the number and accessibility of reactive ring positions.[9](https://www.springerprofessional.de/enzymatic-synthesis-of-phenolic-polymers-structures-properties-a/52404472) For polysaccharides, cellodextrin phosphorylase (EC 2.4.1.49, GH94) catalyzes iterative β-1,4-glycosylation of cellobiose using α-glucose 1-phosphate as donor.[10](https://pubs.acs.org/accacs/article/16/14/13007/5169864/Enzymatic-Control-of-Polymerization-Shapes-the)\n\n## How it is done\n\nA representative eROP protocol dissolves 0.5 g of ε-caprolactone in 0.25 mL solvent (or runs solvent-free), adds 100 mg [Novozym 435](https://www.edgepedia.org/novozym-435), seals, and stirs at 70 °C.[7](https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra09038b) The key parameters are the lipase type and batch, solvent type and amount, water content in enzyme and solvent, and temperature.[7](https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra09038b) Published work uses about 10% (w/w) enzyme relative to monomer mass, with outliers from 2–3% (Candida rugosa lipase) to 20% (N435).[5](https://www.mdpi.com/2673-6209/2/1/3) Enzyme drying before use is crucial because reversible hydrolysis, esterification, transesterification, and interesterification can all occur.[5](https://www.mdpi.com/2673-6209/2/1/3)\n\nSolvent regime controls outcome. Hydrophobic solvents with low water content give the highest molecular weights: N435-catalyzed ROP of ε-caprolactone in toluene at 70 °C for 4 h reached 85% conversion and \\( M_{\\mathrm{n}} \\) 17,000 g/mol, scaling to \\( M_{\\mathrm{n}} \\) 44,800 g/mol at 10 mL scale, while water-miscible solvents (dioxane, acetonitrile, THF) gave below 30% conversion in 4 h and \\( M_{\\mathrm{n}} \\) below 5,200 g/mol.[6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6953973/) Solvent-free ROP of ε-caprolactone at 70 °C for 2 days gave \\( M_{\\mathrm{w}} \\) 20,700 at 56% yield (PDI 1.45).[7](https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra09038b) For phenolic polymerization, modeling shows high molecular weights are favored by low enzyme concentrations and phenols with low radical-coupling but relatively high radical-transfer rate constants.[11](https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/10.1002/bit.260420704)\n\n## Origin\n\nUsing a hydrolase for polymer synthesis founded the field of enzymatic polymerization.[1](https://pubs.acs.org/doi/full/10.1021/cr0002590) The first in vitro cellulose synthesis via a nonbiosynthetic path using cellulase as catalyst was reported by [Shiro Kobayashi](https://www.edgepedia.org/shiro-kobayashi) and colleagues in the [Journal of the American Chemical Society](https://www.edgepedia.org/journal-of-the-american-chemical-society) in 1991.[12](https://doi.org/10.1021/ja00008a042) For polyphenols, Jonathan S. Dordick and colleagues reported peroxidase-catalyzed polymerization of phenols in nonaqueous media in [Biotechnology and Bioengineering](https://www.edgepedia.org/biotechnology-and-bioengineering) in 1987, later credited as the first such study.[13](https://doi.org/10.1002/bit.260300106) • [14](https://www.sciencedirect.com/science/article/pii/S1319610317300418) • [15](https://pmc.ncbi.nlm.nih.gov/articles/PMC9740404/) Hiroshi Uyama and colleagues reported the unusually high reactivity of macrolides in this reaction in 1995 in the Bulletin of the Chemical Society of Japan,[16](https://doi.org/10.1246/bcsj.68.56) and Shiro Kobayashi and colleagues extended it to medium-size lactones in 1998 in Macromolecular Chemistry and Physics.[17](https://doi.org/10.1002/%28sici%291521-3935%2819980801%29199:8<1729::aid-macp1729>3.0.co;2-v)\n\n## Variants\n\n**Lipase polyesters.** Lipase-catalyzed polyester synthesis has two major modes: ring-opening polymerization of lactones and polycondensation, the latter usually with the carboxylic acid activated as an ester such as a vinyl ester.[4](https://onlinelibrary.wiley.com/doi/10.1002/marc.200800690) The ROP route spans four-membered lactones to macrolides and cyclic oligomers, and extends to substituted cyclic carbonates and cyclic phosphates, giving polycarbonates and polyphosphates.[3](https://link.springer.com/chapter/10.1007/12_030) N435-catalyzed eROP of 6- to 13- and 16-membered lactones gives polyesters with \\( M_{\\mathrm{n}} \\) from 6,600 to 23,600 g/mol, and macrocyclic lactones polymerize faster than small cyclic ones.[15](https://pmc.ncbi.nlm.nih.gov/articles/PMC9740404/) PLA is accessible either from lactide by ROP or from lactic acid by direct polycondensation, which releases water as by-product.[5](https://www.mdpi.com/2673-6209/2/1/3)\n\n**Polyphenols.** HRP vigorously polymerizes phenols in mixtures of water with dioxane, acetone, dimethylformamide, or methyl formate up to 95% solvent content, giving polymers with average molecular weights from 400 to \\( 2.6 \\times 10^{4} \\) D depending on medium and phenol.[13](https://doi.org/10.1002/bit.260300106) A related phenol-resin family was synthesized by enzymatic oxidative polymerization by Hiroshi Uyama and colleagues in 1994 in Chemistry Letters.[18](https://doi.org/10.1246/cl.1994.423)\n\n**Polysaccharides.** Cellodextrin phosphorylase produces cello-oligomers, typically DP 7–15, that align antiparallel to form crystalline cellulose II; chemical synthesis reaches DP up to 20 but faces challenges in stereocontrol, scalability, and tunable chain length.[10](https://pubs.acs.org/accacs/article/16/14/13007/5169864/Enzymatic-Control-of-Polymerization-Shapes-the)\n\n## Applications\n\nEnzymatic ROP offers a metal-free route to ring-based monomers of varying size and functionality, which matters for biomedical polyesters where residual metal from Sn(Oct)2 catalysis is difficult to remove.[2](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k) Enzymatic phenolic polymers have been explored as substitutes for phenol-formaldehyde resins: poly(p-phenylphenol) and poly(p-cresol) were prepared on gram scale, with much higher melting points than the resins and, for poly(p-phenylphenol), much higher electrical conductivity.[13](https://doi.org/10.1002/bit.260300106) Phenolic polymer architecture supports antioxidant activity, metal binding, biocompatible coatings, and optoelectronic uses.[9](https://www.springerprofessional.de/enzymatic-synthesis-of-phenolic-polymers-structures-properties-a/52404472) Degradative transformation of enzymatic polyesters and polycarbonates back into cyclic oligomers enables repetitive chemical recycling.[3](https://link.springer.com/chapter/10.1007/12_030)\n\n## Limitations and alternatives\n\n**Water and hydrolysis.** Above roughly 0.2–0.5 wt% water, eROP rate increases but polyester molecular weight falls because of hydrolysis.[6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6953973/) • [7](https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra09038b) Excess polar solvent, long times (7 days), or high temperature (130 °C) also lower molecular weight through polyester degradation.[7](https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra09038b)\n\n**Slow kinetics and chain length.** eROP of lactide is generally slow and may limit widespread adoption; N435 reached 80% lactide conversion only after 24 h and gave 90% yield but molecular mass below 4,000 g/mol, attributed to weak affinity between the binding site and lactide.[2](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k) • [5](https://www.mdpi.com/2673-6209/2/1/3) A main challenge of eROP is the limited chain length of the products.[19](https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cctc.201900976) One report describes no N435 activity toward D,L-lactide in bulk,[2](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k) while another reports bulk d,l-lactide polymerization at 130 °C with [Pseudomonas](https://www.edgepedia.org/pseudomonas) cepacia lipase PS giving \\( M_{\\mathrm{w}} \\) 270,000 g/mol at 16% yield.[6](https://pmc.ncbi.nlm.nih.gov/articles/PMC6953973/)\n\n**Comparison with chemical ROP.** Tin(II) octanoate, a toxic compound, is the common PCL catalyst; it needs high temperatures that promote esterification and broaden dispersity, and is hard to remove.[2](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k) Chemical ROP of small and medium rings is driven by ring-strain relief, and macrolides polymerize only slowly to low molar mass with organometallic catalysts, whereas lipases handle large rings well.[2](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k) Unlike chemical ROP catalysts, immobilized lipases can be recycled; N435 is the most successful commercialized immobilized enzyme.[19](https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cctc.201900976)\n\n**Recent developments.** In continuous flow with FEP tubing (i.d. 1.55 mm), ε-caprolactone was fully polymerized in 214 s (Đ = 1.30) and δ-valerolactone to 93% conversion (Đ = 1.27).[20](https://www.sciencedirect.com/science/article/pii/S0032386121006637) An engineered CAL-B variant, I285R, showed nearly three-fold higher catalytic efficiency for ε-caprolactone ROP in dry toluene and 30% higher molecular weight than wild type.[19](https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cctc.201900976)\n\n## References\n\n1. [Polymer Synthesis by In Vitro Enzyme Catalysis | Chemical Reviews](https://pubs.acs.org/doi/full/10.1021/cr0002590)\n2. [Harnessing enzymes for greener polymerisations: advances in chain and step growth processes](https://pubs.rsc.org/en/content/articlehtml/2025/py/d5py00223k)\n3. [Enzymatic Synthesis of Polyesters via Ring-Opening Polymerization (Matsumura, Advances in Polymer Science vol 194)](https://link.springer.com/chapter/10.1007/12_030)\n4. [Recent Developments in Lipase-Catalyzed Synthesis of Polyesters](https://onlinelibrary.wiley.com/doi/10.1002/marc.200800690)\n5. [Enzymatic Polymerization as a Green Approach to Synthesizing Bio-Based Polyesters](https://www.mdpi.com/2673-6209/2/1/3)\n6. [Enzymatic Ring-Opening Polymerization (ROP) of Polylactones: Roles of Non-Aqueous Solvents](https://pmc.ncbi.nlm.nih.gov/articles/PMC6953973/)\n7. [Enzymatic ring-opening polymerization (ROP) of lactides and lactone in ionic liquids and organic solvents: digging the controlling factors](https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra09038b)\n8. [Enzymatic Ring-Opening Polymerization of Lactones by Lipase Catalyst: Mechanistic Aspects (Kobayashi, 2006, Macromolecular Symposia)](https://onlinelibrary.wiley.com/doi/10.1002/masy.200650822)\n9. [Enzymatic synthesis of phenolic polymers: structures, properties, and applications (review, 2026)](https://www.springerprofessional.de/enzymatic-synthesis-of-phenolic-polymers-structures-properties-a/52404472)\n10. [Enzymatic Control of Polymerization Shapes the Structural Assembly of Bottom-Up Synthesized Cellulose](https://pubs.acs.org/accacs/article/16/14/13007/5169864/Enzymatic-Control-of-Polymerization-Shapes-the)\n11. [Numerical and Monte Carlo simulations of phenolic polymerizations catalyzed by peroxidase (1993, Biotechnology and Bioengineering)](https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/10.1002/bit.260420704)\n12. [Shiro Kobayashi and colleagues (1991). Novel method for polysaccharide synthesis using an enzyme: the first in vitro synthesis of cellulose via a nonbiosynthetic path utilizing cellulase as catalyst. Journal of the American Chemical Society.](https://doi.org/10.1021/ja00008a042)\n13. [Jonathan S. Dordick, Michael A. Marletta, Alexander M. Klibanov (1987). Polymerization of phenols catalyzed by peroxidase in nonaqueous media. Biotechnology and Bioengineering.](https://doi.org/10.1002/bit.260300106)\n14. [Horseradish peroxidase-catalyzed polymerization of ortho-imino-phenol](https://www.sciencedirect.com/science/article/pii/S1319610317300418)\n15. [Recent Advances in the Enzymatic Synthesis of Polyester](https://pmc.ncbi.nlm.nih.gov/articles/PMC9740404/)\n16. [Hiroshi Uyama, Kazuhiro Takeya, Shiro Kobayashi (1995). Enzymatic Ring-Opening Polymerization of Lactones to Polyesters by Lipase Catalyst: Unusually High Reactivity of Macrolides. Bulletin of the Chemical Society of Japan.](https://doi.org/10.1246/bcsj.68.56)\n17. [(sici)1521 3935(19980801)199:8<1729::aid macp1729>3.0.co (doi.org)](https://doi.org/10.1002/%28sici%291521-3935%2819980801%29199:8<1729::aid-macp1729>3.0.co;2-v)\n18. [Hiroshi Uyama and colleagues (1994). Synthesis of a New Family of Phenol Resin by Enzymatic Oxidative Polymerization. Chemistry Letters.](https://doi.org/10.1246/cl.1994.423)\n19. [Enzymatic Ring-Opening Polymerization of Lactones: Traditional Approaches and Alternative Strategies](https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cctc.201900976)\n20. [Polylactones synthesis by enzymatic ring opening polymerization in flow](https://www.sciencedirect.com/science/article/pii/S0032386121006637)\n\n---\n*Topic: Encyclopedia › Physical world and mathematics › Chemistry › Chemical principles and methods › Chemical synthesis › Polymer synthesis*\n\n*Initially written Sep 29, 2026 · Edited: Oct 15, 2026*\n\n*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*\n\nLicense: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license\n", "same_as": [], "url": "https://www.edgepedia.org/enzymatic-polymerization", "markdown_url": "https://www.edgepedia.org/enzymatic-polymerization.md", "license": { "name": "Edgepedia Community License 1.0", "url": "https://www.edgepedia.org/edgepedia/license", "summary": "Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.", "spdx": "LicenseRef-Edgepedia-Community-1.0" }, "credit": "\"Enzymatic polymerization\", Edgepedia (EdgeChat), https://www.edgepedia.org/enzymatic-polymerization. Edgepedia Community License 1.0.", "credit_md": "\"[Enzymatic polymerization](https://www.edgepedia.org/enzymatic-polymerization)\", Edgepedia (EdgeChat), [https://www.edgepedia.org/enzymatic-polymerization](https://www.edgepedia.org/enzymatic-polymerization). [Edgepedia Community License 1.0](https://www.edgepedia.org/edgepedia/license).", "credit_html": "\"Enzymatic polymerization\", Edgepedia (EdgeChat), https://www.edgepedia.org/enzymatic-polymerization. Edgepedia Community License 1.0.", "speakable": "Enzymatic polymerization is the in vitro synthesis of polymers by isolated enzymes such as lipases and peroxidases, a metal-free route to polyesters, polycarbonates, polyphenols, and polysaccharides." }