Rethinking Reagents: Green Chemistry Drives Triton X-100 Replacement at CST

When it comes to scientific rigor, sustainability doesn’t have to take a backseat. In today’s research environment, where environmental regulations increasingly shape procurement decisions, many life science companies are rethinking the reagents they use in the lab every day. One such compound is Triton X-100—a non-ionic surfactant that has long been a staple in cell lysis and protein extraction workflows but is now recognized as environmentally persistent and harmful to aquatic life.

At CST, our scientists have validated a greener, high-performing alternative for use in our Cell Fractionation Kit (Eco-friendly detergent) #42193. This initiative shows that, when assay design, scientific reproducibility, and environmental responsibility are prioritized, achieving green chemistry is possible without sacrificing scientific data quality. 

Samantha Webster  Compliance Supervisor

“With the right data, collaboration, and commitment, meaningful change is possible—and I hope our experience encourages others to take on similar efforts in their labs.”

The project all started with something simple—a team of committed employees who asked how we could reduce the environmental footprint of our daily activities in the lab.

Green Chemistry in Practice: Rethinking Reagents One Step at a Time

Laboratories are resource-intensive, from energy consumption to single-use plastics to chemical use. One of the most direct ways to reduce a lab’s environmental impact is by replacing hazardous or toxic chemicals with safer alternatives.

For any reagent substitution project, we recommend starting with these steps:

• Inventory your current reagents. Identify chemical hazards, assess regulatory risk, and consider frequency of use to determine candidate reagents for replacement.

• Engage colleagues early. It’s important to get early buy-in from scientists and explain the “why” behind replacements for any project that will affect the day-to-day.

• Set performance benchmarks. Establish clear experimental parameters to objectively assess alternatives without introducing bias.

Triton X-100 is often an excellent place to start, as it is both widely used and environmentally concerning, and multiple alternatives can provide comparable performance in many applications.

Why Replace Triton X-100?

Triton X-100 is a nonionic surfactant that is highly effective at disrupting cellular membranes and it is commonly used in immunofluorescence (IF), immunocytochemistry (ICC), and immunohistochemistry (IHC) applications for permeabilization, cell lysis, and protein extraction. However, it breaks down in the environment into 4-tert-octylphenol, a persistent compound linked to endocrine disruption and aquatic toxicity and increasing evidence of its harmful effects have led to tighter regulations globally. Because of this, Triton X-100 was banned by the European Union under the REACH Regulation, which classified it as a Substance of Very High Concern (SVHC). Other countries and institutions are following suit, with growing pressure to eliminate the compound from laboratories and supply chains altogether.

Making the Swap: Finding a Safer Alternative to Triton X-100

Once we identified Triton X-100 as a target for replacement, members of our Research & Development, Operations, Compliance, and Production teams worked together to evaluate replacements that would match Triton X-100’s performance, but without its harmful environmental side effects.

We focused on this primary question: Could we maintain high-quality staining and fractionation performance while reducing or removing Triton X-100 from our workflows? Candidate reagents were selected that we hypothesized might meet this overarching goal.

Next, we established clear testing criteria, which included the following: detergent efficiency (cell permeabilization and lysis), reagent compatibility (antibody performance and signal-to-noise ratio), stability across pH and temperature ranges, formulation robustness, and availability from biorenewable and sustainable sources. Testing was conducted by different CST departments, with each team developing their own application-specific experimental methodologies to meet the established testing criteria.

"We tested several Triton X-100 alternatives using our standard IF protocol to identify a suitable, environmentally friendly replacement,” explains Amanda Davidson, a scientist on CST’s Immunofluorescence team. “By validating these alternatives within our established workflows, we’ve ensured a seamless transition for our customers that maintains the high standards of CST imaging.”

Within the IF department, the team used a panel of IF‑validated CST antibodies against different cellular targets (membrane, cytoskeletal, and nucleic) to compare staining quality and signal intensity under multiple conditions and with different candidate reagents. Images and quantitative analyses confirmed that several Triton X-100 alternatives produced similar or better signal intensities, with no compromise in staining quality or antibody performance. 

The IF team found that the efficacy of the leading alternatives was largely antibody-dependent, suggesting that the optimal detergent may vary based on the specific target. A subset of the testing data is shown in Figure 1. 

Figure 1: Immunofluorescence imaging of HeLa cells CD44 (156-3C11) Mouse Monoclonal Antibody #3570 (membrane protein, green), alpha-Tubulin (DM1A) Mouse Monoclonal Antibody #3873 (cytoskeleton protein, yellow), and Tri-Methyl-Histone H3 (Lys27) (C36B11) Rabbit Monoclonal Antibody #9733 (nucleas protein, purple) using Triton X-100 and compared to candidate reagents. Fluorescence intensities for each candidate are indicated.

“Our testing showed that several eco-friendly detergents can produce results comparable to Triton X-100; however, the optimal choice remains antibody-dependent,” notes Davidson. “These findings provide a clear alternative for labs needing to navigate reagent restrictions without sacrificing image quality.” 

After comparing data across departments, ECOSURF SA-9 was identified as the ideal alternative. Derived from seed oil, ECOSURF follows the Green Chemistry principle for Design for Degradation. It provides similar surfactant properties to Triton X-100, is stable over a wide pH range, and doesn’t react with proteins or nucleic acids, making it well-suited for cell fractionation.

The replacement reagent is now used in many CST labs, and we’re pleased to make it available as a greener option for customers in the Cell Fractionation Kit (Eco-friendly detergent) #42193.

Partnering for Success: Beyond Benign and Green Chemistry Education

Creating lasting change, however, means looking beyond our own labs. That’s why CST is proud to support Beyond Benign, a nonprofit dedicated to integrating green chemistry into science education.

“Chemists are not traditionally taught to understand what makes a molecule hazardous to humans or the environment,” explains Dr Amy Cannon, Co-Founder and Executive Director of Beyond Benign, and recipient of the world’s first PhD in Green Chemistry. “By supporting educators and students to teach and learn green chemistry and sustainable science in K-20 classrooms, we’re equipping the next generation of scientists and citizens with the tools they need to design and select products that support human health and the environment.”

One of Beyond Benign’s key initiatives is the Green Chemistry Teaching and Learning Community (GCTLC), of which CST is a founding sponsor, an open-source platform where scientists who are passionate about green chemistry can share resources and connect about the topics they care about.

“Networks like the GCTLC are a key ingredient to creating STEM reform,” explains Cannon. “There are a lot of obstacles and risks around changing teaching practices, and having peer support and a community to share resources, curricula, and best practices can help overcome those challenges.”

Like Beyond Benign, we believe that investing in students and education is one of the most important ways to create lasting change. In celebration of CST’s 25th anniversary, we launched a special campaign to award an additional $25,000 to one of the nonprofit partners we support annually. We asked our community to vote for the organization they felt was most deserving—and were thrilled to award that gift to Beyond Benign in recognition of their important work.

If you're considering green chemistry initiatives in your lab, I encourage you to explore Beyond Benign’s resources. Small changes—like rethinking reagents—can make a big difference.

Learn more about Environmental & Social Responsibility at CST.

A Culture That Inspires Change

One of the things I love most about working at CST is that sustainability has always been part of our DNA. Whether it’s our pledge to reach net-zero emissions by 2029, the free plant-based lunches in our cafeteria, or our efforts to reduce single-use plastic in our labs, we’re always looking for ways to improve our practices.

But it’s not just corporate initiatives that drive change at CST. Like the Triton X-100 replacement project, many of our initiatives begin with CST employees identifying everyday activities that could be done more responsibly—then taking action.

Implementing change in the lab isn’t easy. It can be difficult to know which changes will have the greatest impact, whether potential alternatives are truly safer, and if they will work effectively in real-world workflows. Being part of the team that helped implement the switch to an eco‑friendly nonionic surfactant to replace Triton X‑100 has shown me that with the right data, collaboration, and commitment, meaningful change is possible—and I hope our experience encourages others to take on similar efforts in their labs.

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