​Why Is Durable Antimicrobial Technology Needed?

Many antimicrobial, antibacterial, and disinfection technologies are effective at the time of treatment. However, surfaces and materials may be exposed to microorganisms again after cleaning or disinfection.

This is particularly important for repeatedly used textiles and frequently touched materials, where the key challenge is how to maintain antimicrobial functionality for longer periods under actual conditions of use.

AbedulAg⁺ is a technology being developed with the aim of balancing antimicrobial performance with durability, low silver release, and safety considerations.

​

1. From Temporary Disinfection to Longer-Lasting Surface Functionality

Surfaces may become contaminated again through subsequent contact and use, even after cleaning or disinfection.

Examples of repeatedly used materials include:

Healthcare and caregiving textiles / uniforms and workwear / bedding and bed linens / curtains / masks and protective materials / transportation interiors / frequently touched surfaces

For such applications, technologies that complement routine cleaning and disinfection and aim to maintain material surface functionality between cleaning events are increasingly important.

​

2. Why Does Durability Matter?

Materials may be exposed to microorganisms each time they are used.

Cleaning and disinfection → Reduction of microorganisms → Reuse → Potential recontamination → Further cleaning or treatment

This cycle is repeated.

One approach to complement routine hygiene management is therefore to provide antimicrobial functionality directly to the material surface and maintain that functionality for longer periods.

Achieving this, however, presents significant technical challenges.

​

3. Three Technical Challenges in Durable Antimicrobial Materials

The development of durable antimicrobial materials requires a careful balance among three key factors:

Antimicrobial Performance: Providing sufficient antimicrobial activity against relevant microorganisms.

Durability: Maintaining functionality after repeated use, cleaning, laundering, moisture exposure, and mechanical stress.

Low Leaching and Safety Considerations: Minimizing unnecessary release of active components while maintaining antimicrobial functionality.

Increasing the availability of an antimicrobial component may improve activity but may also raise concerns regarding leaching and environmental release. Conversely, excessive immobilization may reduce its ability to function effectively at the material surface.

How can antimicrobial performance × durability × low leaching be balanced? This is one of the key technical challenges in developing durable antimicrobial materials.

​

4. Beyond Simply “Releasing” Active Components: Maintaining Surface Functionality

Many conventional antimicrobial technologies include approaches that rely on the release or gradual consumption of active components.

While release can enable interaction with microorganisms, continued release may gradually reduce the amount of active component remaining in the material.

For materials intended for long-term use, it is therefore necessary to consider:

Remaining active content / long-term performance / durability after cleaning and laundering / environmental release

For this reason, an important question is not simply “how much is released,” but how antimicrobial functionality can be maintained at the material surface itself.

​

5. The AbedulAg⁺ Approach

Aiming to Maintain Surface Functionality for Longer Periods

AbedulAg⁺ combines electrolytically generated silver ions (Ag⁺) with a TiO₂-based ceramic matrix.

Rather than relying on the continuous release of large amounts of antimicrobial agents, the technology aims to stabilize active silver species at the material surface interface where microorganisms come into contact, while maintaining antimicrobial functionality.

The objective of AbedulAg⁺ is to achieve a balance among:

Antimicrobial Performance × Durability × Low Silver Release

​​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

 

​6. How AbedulAg⁺ Is Positioned

AbedulAg⁺ is not intended to replace established cleaning and disinfection practices.

It is positioned as one material technology that may complement routine cleaning and disinfection.

Conventional cycle:
Disinfection → Temporary reduction of microorganisms → Reuse → Potential recontamination → Repeated disinfection

The approach pursued by AbedulAg⁺:
Provide antimicrobial functionality to the material surface → Aim to maintain surface functionality during use → Evaluate durability after repeated use and laundering → Aim for longer-lasting functionality

The goal is not to replace established hygiene practices, but to explore the potential of a new material technology that complements them.

​

7. Four Key Development Priorities

① LONG-LASTING | Maintaining Functionality Through Repeated Use

In addition to initial antimicrobial performance, we consider the ability to maintain performance after repeated use and laundering to be an important evaluation criterion.

Under the specified test conditions, high antimicrobial activity has been observed after up to 300 laundering cycles. Long-term evaluation under a range of anticipated conditions of use is continuing.

② LOW LEACHING | Minimizing Unnecessary Silver Release

Minimizing unnecessary silver release while maintaining antimicrobial functionality is another important development objective.

In water immersion testing, silver release of ≤1 ppb was measured after five days under the specified test conditions. This result is used as one indicator in evaluating the stability of the antimicrobial system.

③ DURABLE | Designed with Repeated Laundering and Use in Mind

Textile products undergo repeated cycles of use → contamination → laundering → reuse.

AbedulAg⁺ is being developed with such conditions in mind, with particular emphasis on the potential to maintain functionality after repeated laundering and use.

④ SAFETY-CONSCIOUS | Safety as an Important Development Consideration

For materials intended for long-term use, safety considerations are essential.

In addition to antimicrobial performance testing, AbedulAg⁺ has also undergone biocompatibility evaluations based on relevant ISO 10993 test methods. Safety and biocompatibility are regarded as important development and evaluation considerations, alongside antimicrobial performance and durability.

​​

​

​

​

​

​

​

​

​​

​

​

​

​

​

​

 

8. Our Goal: Practical and Durable Surface Functionality

Our goal is not simply to develop a “stronger antimicrobial agent.”

Our objective is to maintain practical antimicrobial functionality for longer periods on materials that are repeatedly used.

To achieve this, we seek to balance:

Antimicrobial Performance / Durability / Low Silver Release / Safety Considerations

This is the fundamental development philosophy behind AbedulAg⁺.

​

9. Toward a More Durable Antimicrobial Surface Platform

Many materials used in everyday life repeatedly undergo the cycle of:

Touch → Use → Clean → Reuse

This includes textiles, healthcare and caregiving materials, bedding, interior materials, frequently touched surfaces, and protective materials.

For these applications, there is potential value in materials capable of maintaining useful surface functionality between routine cleaning events.

AbedulAg⁺ is being developed as a durable antimicrobial surface platform that aims to balance:

Safety Considerations × Durability × Antimicrobial Performance

In addition to various evaluations in Japan, we are advancing performance studies under conditions intended to reflect actual use more closely through collaborative research with external research institutions.

By continuing to accumulate scientific data, we aim to evaluate the potential role that durable antimicrobial materials may play in future hygiene management and infection prevention.