Enzyme Characterization Services
Enzyme-Mediated Plastic Transformation Profiling
Profile how polymer-active enzymes and engineered variants act on defined plastic substrates, with product-level readouts that show what.
What This Service Is
Enzyme-mediated plastic transformation profiling is the analytical characterization of how a polymer-active enzyme acts on a defined plastic substrate. Instead of inferring degradation from indirect signals, the service measures enzyme activity, substrate conversion, and the release of soluble products so that the transformation pathway and its extent can be described with evidence.
The work centers on hydrolases that act on synthetic polymer backbones. Ester-bond-cleaving enzymes such as PET hydrolases and cutinases, including engineered LCC-type variants, catalyze hydrolysis through acylation and deacylation steps, releasing soluble monomers and oligomers. For PET, mono(2-hydroxyethyl) terephthalate (MHET) is a commonly reported primary hydrolysis product, with further conversion toward terephthalate (TPA) and ethylene glycol depending on the enzyme system.
Because observed activity depends heavily on enzyme stability, expression level, and purification state, profiling is designed to control those variables rather than report a single unqualified number. The result is a defensible picture of which enzyme or variant acts on which plastic, under which reaction conditions, and at what relative rate.
Defined Plastic Substrates
Assays are run against characterized plastic substrates so that conversion and product release can be attributed to enzymatic action rather than to uncontrolled material variability.
- Consumer-grade and reference PET formats
- Amorphous versus higher-crystallinity material compared
- Substrate load and particle format recorded
Hydrolytic Product Profiling
Product identity and accumulation are resolved analytically, giving a pathway-level view of backbone cleavage rather than a single bulk signal.
- Soluble monomer and oligomer detection
- MHET and TPA resolved where relevant
- Time-course sampling to capture accumulation
Ranked Variant Data
Enzyme candidates and engineered variants are compared on a common assay basis so that relative performance can be ranked and prioritized.
- Activity compared across variants
- Stability behavior noted under assay conditions
- Data tables suitable for internal decision-making
Why Profiling Matters
Synthetic polymers are produced at an estimated 400–450 million metric tons annually, and only a fraction of that material is recycled. For some plastics, notably PET and several bioplastics, effective enzymatic solutions have been described under controlled conditions, while for others such as polyolefins and vinyl polymers no truly efficient degraders are currently known. That gap makes evidence quality the deciding factor in whether an enzyme claim can support a recycling or upcycling program.
Reported enzyme-mediated transformation data are generated through heterogeneous analytical approaches, ranging from qualitative observations of surface change to quantified product release. Without a defined substrate, controlled enzyme production, and a product-level readout, results are difficult to compare across candidates or to transfer into process development. Profiling addresses that by fixing the assay basis and reporting what was measured.
| Plastic class | Enzymatic status | Typical profiling readout | Practical note |
|---|---|---|---|
| PET and ester-based polyesters | Effective enzymatic solutions described under controlled conditions | Soluble hydrolysis products including MHET and TPA | Most mature target for activity and variant ranking |
| Ester-based polyurethane and polycarbonates | Enzyme activity reported for selected ester linkages | Linkage-specific product release | Scope depends on polymer formulation and accessibility |
| Polyamide oligomers | Mechanisms understood mainly at the oligomer level | Oligomer conversion products | Full-polymer degradation remains an open question |
| Polyethylene, polypropylene, PVC, polystyrene | No truly efficient degraders currently known | Oxidative or partial modification signals where reported | Profiling is exploratory and hypothesis-generating |
How Engagement Works
Projects are structured around a defined substrate and a defined question, so that the assay basis is agreed before any enzyme is produced. The workflow below describes the standard sequence; specific enzyme families, substrate formats, and analytical depth are set per project.
Scope and Candidate Selection
We agree on the target plastic, the enzyme classes of interest, and the decision the data must support. Candidate sets commonly include PET hydrolases, cutinases, and engineered variants such as LCC-type enzymes, together with any client-supplied sequences.
Enzyme Production
Selected enzymes and variant libraries are produced in a heterologous expression host, with extracellular or secreted formats used where the enzyme system supports it. Production and handling conditions are recorded because expression level and purity strongly influence measured activity.
Variant Library Generation
Where improved performance is the goal, error-prone mutagenesis or rational engineering is used to generate variant libraries. Libraries are then carried into screening so that variants can be compared on a consistent assay basis rather than in isolation.
Assay Against Defined Substrate
Enzyme is incubated with the defined plastic substrate under controlled reaction conditions, including temperature and buffer. Time-course sampling captures the progression of hydrolysis and allows thermal stability behavior to be observed alongside activity.
Customization Options
Profiling scope is defined case by case. The options below describe what can be adjusted after consultation; the final combination is fixed in the project scope so that the assay basis and deliverables are clear before work begins.
Substrate Format and Pretreatment
The plastic substrate can be specified as a reference material, a client-supplied sample, or a consumer-grade format, with particle size and crystallinity recorded as part of the assay description.
- Reference versus client-supplied plastic
- Amorphous and higher-crystallinity PET compared
- Substrate load and surface format documented
Candidate and Variant Panels
Panels can range from a small set of characterized enzymes to larger variant libraries generated by mutagenesis, depending on whether the goal is confirmation or improvement.
- Client-supplied enzymes and sequences accepted
- Error-prone or rational variant generation
- Library size scoped per project
Product Detection Depth
Analytical readouts are selected to match the question, from spectrophotometric activity tracking to chromatographic and mass-based identification of specific hydrolysis products.
- HPLC-based product quantification
- Mass-based confirmation of product identity
- Time-course versus endpoint sampling
Service Scope
Scope is agreed per project rather than selected from fixed packages. The table below shows the parameters that are typically defined during consultation and the kind of range each can take.
| Parameter | Typical project scope | What is recorded | Notes |
|---|---|---|---|
| Target plastic substrate | One or more defined plastic types, as scoped | Polymer type, format, crystallinity, load | PET and ester-based polymers are the most established targets |
| Enzyme candidates | Client-supplied enzymes plus selected reference hydrolases | Sequence or source, expression format | Cutinases and PET hydrolases commonly used as starting points |
| Variant library | Optional; library size scoped per project | Mutagenesis strategy and screening rounds | Included when the goal is improved activity or stability |
| Expression host | Heterologous host selected per enzyme system | Host, secretion format, production conditions | Extracellular formats simplify screening where supported |
| Analytical readout | Selected from available detection methods | Method, product identity, quantification basis | HPLC, spectrophotometric, or mass-based detection |
| Reaction conditions | Temperature, buffer, and duration as scoped | Setpoints and any condition series | Stability behavior assessed alongside activity |
| Deliverables | Ranked variants with activity data and assay documentation | Data tables, conditions, product profiles | Format agreed at project start |
| Technical support | Named scientific contact at project start; milestone review calls; email response within 1 business day | Contact and review schedule | Applies to all projects |
Analytical Readouts
The value of a profiling project depends on whether the readout actually captures the transformation being claimed. We select detection methods that resolve products rather than only reporting a bulk change, and we document the basis of each measurement so results can be compared across candidates and across projects.
HPLC Product Quantification
Liquid chromatography is commonly used to separate and quantify soluble hydrolysis products, allowing accumulation of specific monomers and oligomers to be tracked over time.
- Separation of soluble products
- Quantification against calibrated standards
- Time-course accumulation profiles
Spectrophotometric Activity Tracking
Spectrophotometric assays provide a rapid activity signal suitable for screening larger variant sets before more detailed product analysis is applied to selected candidates.
- Rapid relative activity comparison
- Useful for library triage
- Confirmed by product-level methods
Mass-Based Product Identification
Mass-based detection supports confirmation of product identity, which matters when distinguishing genuine backbone hydrolysis from partial or non-specific modification.
- Confirmation of product identity
- Detection of oligomeric intermediates
- Supports pathway interpretation
Deliverables and Reporting
Deliverables are defined in the project scope and reported in a format agreed at the start. The table below summarizes what a typical engagement produces and how each item is documented.
| Deliverable | Description | Format | Scope note |
|---|---|---|---|
| Ranked enzyme variants | Candidates ordered by measured activity under the agreed assay conditions | Data table with relative activity values | Quantity of variants scoped per project |
| Activity data | Measured activity and product release for each candidate tested | Tabulated results with assay conditions | Readout method recorded for each dataset |
| Stability observations | Behavior of candidates under the reaction and temperature conditions tested | Condition series summary | Depth of stability testing scoped per project |
| Product profiles | Identity and relative abundance of detected hydrolysis products | Chromatographic or mass-based results | Products reported depend on the substrate and enzyme system |
| Assay documentation | Substrate specification, enzyme production notes, and reaction conditions | Written methods summary | Supports internal review and method transfer |
| Interpretation summary | Qualified assessment of which candidates warrant further development | Narrative summary alongside data tables | Conclusions limited to the conditions tested |
Evidence Boundaries
Enzymatic plastic transformation is an active research area with uneven maturity across polymer types. Reported activity depends on enzyme stability, expression, and purification, and on the physical state of the substrate, so results obtained under one set of conditions should not be assumed to hold under another.
We describe what was measured and under which conditions, and we avoid extrapolating beyond the assay basis. Where a polymer class has no truly efficient degrader currently known, profiling is presented as exploratory rather than as a route to a defined conversion target.
Working With Us
Engagements begin with a scoping discussion covering the plastic substrate, the enzyme candidates or libraries involved, and the decision the data needs to support. From there we define the assay basis, the analytical readouts, and the deliverable format before production begins.
A named scientific contact is assigned at project start, with milestone review calls and email response within one business day. Scope, analytical depth, and validation extent are confirmed in the project agreement so that expectations are aligned from the outset.
FAQ
Which plastics can be profiled with this service?
Profiling is most established for PET and other ester-based polyesters, where hydrolysis products such as MHET and TPA can be resolved and quantified. Activity has also been reported for selected ester linkages in ester-based polyurethane and polycarbonates, and for polyamide oligomers. For polyolefins, vinyl polymers, and other highly persistent commodity plastics, no truly efficient degraders are currently known, so work on those materials is exploratory and hypothesis-generating rather than a route to a defined conversion target.
How do you distinguish real enzymatic hydrolysis from surface change?
The readout is chosen to capture products rather than bulk appearance. Soluble hydrolysis products are separated and quantified, and product identity can be confirmed with mass-based detection. This matters because partial or non-specific modification of a plastic surface can produce a visible change without backbone cleavage, and a product-level measurement is what allows the two to be told apart.
Can you work with our own enzymes or variants?
Yes. Client-supplied enzymes and sequences can be included in the candidate panel alongside reference hydrolases such as cutinases and PET hydrolases. Where the goal is improvement rather than confirmation, variant libraries can be generated by error-prone mutagenesis or rational engineering and carried through screening rounds, with library size and screening depth agreed during scoping.
Why does enzyme production matter for the result?
Observed activity depends strongly on enzyme stability, expression level, and purification state, so these variables are controlled and recorded rather than left implicit. Production format, including extracellular or secreted expression where the enzyme system supports it, is documented alongside the assay conditions. Without that control, differences between candidates can reflect production artifacts rather than genuine differences in catalytic performance.
What do we receive at the end of a project?
Deliverables are defined in the project scope and typically include ranked enzyme variants with activity data, stability observations under the conditions tested, product profiles for detected hydrolysis products, and written assay documentation covering substrate specification and reaction conditions. An interpretation summary highlights which candidates warrant further development, with conclusions limited to the conditions actually tested.
References
- Yang XY, Xie LB, Zhang ZW, et al. Yeast-Mediated Plastic Biodegradation. International journal of molecular sciences. 2026;27(9). View on PubMed
- Orr G, Niv Y, Barakat M, et al. Streamlined screening of extracellularly expressed PETase libraries for improved polyethylene terephthalate degradation. Biotechnology journal. 2024;19(7):e2400021. View on PubMed
- Seo H, Hong H, Park J, et al. Landscape profiling of PET depolymerases using a natural sequence cluster framework. Science (New York, N.Y.). 2025;387(6729):eadp5637. View on PubMed
Scope a Profiling Project
Share your target plastic, candidate enzymes, and the decision the data needs to support. We will define the assay basis, analytical readouts, and deliverables with you before any work begins.