Polymer Conjugation

Service Description

Polymer conjugation involves the covalent attachment of polymers to biomolecules such as proteins, peptides, and nucleic acids, enhancing their stability, solubility, and functionality. This technique is crucial for applications in drug delivery, molecular imaging, and protein engineering. At BOC Sciences, we offer exceptional polymer conjugation services that empower researchers to maximize the efficacy of their biomolecular studies, driving advancements in therapeutic development and disease understanding.

What is a polymer?

Polymers are molecules made up of repeating units called monomers that form long molecular chains by covalent bonds. These chains can be linear or branched, and each molecule is connected in the same way. According to the composition of the main chain elements, it can be divided into carbon chain, heterochain and elemental organic polymer. According to the nature and use, it can be divided into rubber, chemical fiber, plastic, adhesive and coating, etc. The polymerization methods of polymers are mainly addition polymerization and condensation polymerization. Addition polymerization is the formation of polymers by exothermic addition reaction of carbon-carbon double-bonded monomers. Condensation polymerization is the formation of polymers by the reaction of molecules with different functional groups with each other. There are many types of polymers, including but not limited to plastics, polysaccharides, DNA, RNA, and proteins. Key features include:

Polymer Compounds: Polymers have very high molecular weights, often in excess of ten thousand, which makes them important materials.

Structural Units: These structural units are connected by covalent bonds, forming long molecular chains. The length and branching of the chain can affect the physical and chemical properties of polymers.

Stability: Polymers are often quite stable, which makes them very important in everyday life and industrial applications.

Applications of Polymer Conjugation

The applications of polymer conjugating are mainly focused on the following aspects:

Protein Functionalization: Polymer conjugation techniques are used to improve the physicochemical properties of proteins, such as solubility and stability.

By connecting polymers and proteins through covalent bonds, the immunogenicity of proteins can be regulated, and the efficacy and safety of drugs can be increased.

In drug delivery systems, polymer conjugates can form different types of spatial structures that serve as drug delivery vehicles and probes for molecular detection.

Materials Industry: In the fields of rubber, plastics, adhesives, sealants, coatings, glass, ceramics, metal anti-corrosion, etc., silane conjugating agents form stable covalent bonds by reacting with polymers or copolymerizing with monomers to achieve the conjugating of different polymers.

This conjugating technology improves the mechanical, electrical, and aging properties of the material.

Biocatalysis and Molecular Imaging: Polymer conjugates also show potential in the field of biocatalysis and molecular imaging, especially in improving the stability and activity of enzymes.

These applications demonstrate the importance and utility of polymer conjugating technology in multiple scientific and industrial fields.

Fig.1 Applications of conjugated polymer materials in bio-detection, imaging, cancer therapy and electronic devices. (Shen, Qi, et al., 2024)

Advantages of Polymer Conjugation

The advantages of polymer conjugating are mainly reflected in the following aspects:

Improving the Physicochemical Properties of Proteins: Polymer conjugation can improve the solubility, stability, and functionality of proteins, which is particularly important for drug development and biotechnology applications.

Reducing the Immunogenicity of Protein Drugs: Binding polymers to proteins through covalent bonds can reduce the immunogenicity of proteins, thereby increasing the efficacy and safety of drugs. This is especially important for long-term treatment and patient management.

Modulation of Protein Self-assembly Properties: Polymer conjugating can modulate the self-assembly properties of proteins, forming various types of spatial structures, serving as drug delivery vehicles and probes for molecular detection.

Enhance Drug Stability and Potency: For example, the covalent conjugating of α-chymotrypsin to methyl methacrylate polymer by carbodiimide improves the stability of the enzyme to pH and has better stability at pH = 6.5 and above.

Improves the Biological Activity of the Enzyme: Catalase-PAA conjugate is synthesized by linking catalase to the carboxyl group of polyacrylic acid, which improves the stability and activity of the enzyme.

Improve the Physicochemical Properties of Biomacromolecules: Biomacromolecule-polymer conjugates realize the integration of the unique advantages of biological and non-biological materials, and create new multivalent display materials with strong affinity for target proteins, good selectivity, and stable physical and chemical properties.

These advantages make polymer conjugation technology have a wide range of application prospects in many fields such as disease treatment, biocatalysis, molecular imaging, and drug delivery.

Our Services

At BOC Sciences, we offer a comprehensive range of polymer conjugation services designed to meet the needs of our customers in the fields of biomedicine, materials science, and biocatalysis. Our services include, but are not limited to:

Polymer Design & Synthesis: Design and synthesis of a wide range of functionalized polymers to achieve specific physicochemical properties and biocompatibility based on the specific needs of our customers.

Protein Conjugation: Advanced chemistry is used to covalently bind polymers to proteins to optimize protein stability, solubility, and functionality.

Drug Delivery System Development: Development of polymer-based drug carriers to enhance drug bioavailability and targeting, and improve drug release properties.

Material Modification & Performance Evaluation: Polymer conjugating modification of a wide range of materials to evaluate their mechanical, electrical, and aging properties to meet the high standards of industrial applications.

Biocatalysis & Molecular Imaging Solutions: Polymer-conjugated biocatalysts and probes that enhance their performance and stability in molecular imaging.

Our Competitive Advantages

BOC Sciences has the following competitive advantages in the field of polymer conjugating:

Professional Technical Team: Our team of scientists has rich industry experience and is able to provide cutting-edge polymer conjugating technology solutions according to the latest research progress.

High Level of Customization: We tailor our services to the specific needs of our customers and ensure that the final product meets the specific requirements of each application.

State-of-the-Art Facilities and Equipment: Our laboratories are equipped with advanced analytical and synthesis equipment, capable of high-throughput screening and fine synthesis to improve research efficiency.

Comprehensive Quality Control: We implement a strict quality management system to ensure that the product quality and safety of each project meet industry standards.

Extensive Application Experience: We have accumulated rich practical experience in various fields such as drug development, biomaterials, food science and environmental technology, and are able to provide customers with diversified solutions.

Quality Services

Antibody Polymer Conjugate

Drug Polymer Conjugates

Peptide Polymer Conjugates

Protein Polymer Conjugates

Case Study

Case Study 1

One of the goals of using polymers to modify proteins is to stabilize the enzyme in a nonnative environment while maintaining or enhancing the activity of the enzyme. Prof. Daniel K. Schwartz and Prof. Joel L. Kaar prepared a series of enzyme-random copolymer conjugates using Candida rugosa lipase (CRL) as a model protein to evaluate the effect of polymer-polymer interactions on the stability and activity of conjugates. First, random copolymers containing different proportions of sulfobetaine methacrylate (SBMA) and poly (ethylene glycol) methyl ether acrylate (PEGMA) were grown from the surface of CRL lipase by ATRP (atom transfer radical polymerization). The results by gel electrophoresis showed the successful preparation of the conjugate. At the same time, the polymers prepared at the same monomer ratio were characterized by nuclear magnetic resonance (NMR) to estimate the molecular weight of the copolymers in the conjugates. The effects of different polymer compositions on conjugate stability and enzyme activity were then evaluated. The results showed that the long-term stability of the enzyme at high temperature was improved by polymer modification, and the activity and stability of the conjugate were affected by different proportions of PEGMA modification. The most active conjugate consists of nearly 50% copolymer and exhibits the best balance of activity and stability.

Fig.2 Schematic diagram of a method involving ATRP for the preparation of CRL-polymer conjugates. (Bisirri, Evan A., et al., 2023)

Case Study 2

The fusion of biological proteins and chemical polymers results in protein-polymer conjugates, which can integrate the unique properties of both components to obtain desired and/or enhanced properties. β-galactosidase (LacZ enzyme) is a key enzyme that is part of the lactose operon system and is mainly found in Escherichia coli and other intestinal flora. The main function of this enzyme is to hydrolyze lactose into two monosaccharides, glucose and galactose, which are the enzymes in the lactose operon that are responsible for the catabolism of lactose. The researchers assessed the effect of the conjugate on enzyme performance by post-modification of the conjugate with the LacZ enzyme. First, the LmrR-PNIPAAm conjugate was modified with LacZ by the SpyTag/Spy Catcher chemistry. The thermal stability of the resulting conjugate-LacZ complex was investigated compared to the control of the free LacZ-Spy Catcher. All samples were incubated at 60°C and tested for enzymatic activity at different intervals. The results showed that the protein-polymer conjugate significantly protected LacZ from heating and that enzyme activity could be maintained at 50% after 30 min of incubation. In addition, conjugated-LacZ complexes were observed to exhibit great tolerance to organic solvents. Samples were treated with pure methanol and it was found that after 3 minutes, the activity of the conjugated LacZ could be maintained at nearly 50%, while the free LacZ-Spy Catcher lost about 90% of its original activity under the same conditions. Control experiments were also performed using only protein-enzyme (LmrR-LacZ) conjugates under the same heating and solvent conditions. The results show that the retention activity of LmrR-LacZ conjugates without polymers is generally similar to that of free LacZ-Spy Catcher samples. In summary, the stability of LacZ at high temperatures and in organic solvents can be greatly improved when the enzyme is linked to a protein-polymer conjugate, which has a similar protective effect to many reported conjugates.

Fig.3 Residual activity of free LacZ-Spy Catcher, polymer-conjugated LacZ-Spy Catcher and LMR-LacZ-LacZ-Spy Catcher conjugates under heating and solvent treatment. (Liu, Yushi, et al., 2022)

Resources

• Conjugation Method
• Bioorthogonal Reactions in Radionuclide Conjugates
• Click Chemistry
• Bioorthogonal Reactions

FAQ

1. What are polymer protein conjugates?

Polymer protein conjugates are formed by linking polymers to proteins, which can enhance the protein's solubility, stability, and biological activity, making them useful for therapeutic and diagnostic applications.

2. What are conjugated conducting polymers?

Conjugated conducting polymers are a class of materials that have alternating single and double bonds, allowing them to conduct electricity. They are utilized in applications such as organic photovoltaics and sensors.

3. What is conjugated polymer synthesis?

Conjugated polymer synthesis is the process of chemically creating polymers with conjugated structures, typically involving techniques like oxidative polymerization or conjugating reactions to achieve specific electronic and optical properties.

4. What are the advantages of polymer conjugation?

Polymer conjugation improves drug stability, reduces immunogenicity, enhances solubility, and allows for controlled release, leading to improved therapeutic outcomes in various applications.

5. How does polymer conjugation impact drug delivery?

Polymer conjugation enables targeted drug delivery by allowing drugs to be released in a controlled manner at the desired site of action, thereby enhancing the therapeutic effect while minimizing side effects.

6. What applications utilize polymer conjugates?

Polymer conjugates are widely used in drug delivery systems, biomolecular diagnostics, tissue engineering, and the development of biosensors, showcasing their versatility across various fields.

7. How does BOC Sciences ensure quality in polymer conjugation services?

At BOC Sciences, we maintain stringent quality control processes, employing advanced analytical techniques to verify the purity and functionality of our polymer conjugates, ensuring reliable results for our clients.

8. Can polymer conjugates be customized?

Yes, we offer tailored polymer conjugation services, allowing clients to specify the type of polymer and biomolecule, ensuring that the final product meets their unique research and application needs.