Researchers at the University of Oxford have developed a novel room-temperature drying technique, matrix-assisted room-temperature (MART) drying, that preserves the activity of protein-based drugs, vaccines, and diagnostic tests, eliminating the need for refrigeration and cold chain dependency.
A critical hurdle in global healthcare and biotechnology is the ' cold chain '. This encompasses the network of refrigerated storage and transportation essential for preserving the efficacy of protein-based drugs, vaccines, and diagnostic tests. This dependence on continuous low temperatures is costly, energy-intensive, and frequently unreliable in regions with inconsistent electricity access, resulting in significant wastage.
However, a team from the University of Oxford's Department of Engineering Science has unveiled a groundbreaking solution: a straightforward, room-temperature drying technique that encapsulates functional proteins within a stable, sugar-based 'glass'. The study, published in the journal Engineering, details the success of the matrix-assisted room-temperature (MART) drying method, spearheaded by Professor Zhanfeng Cui. The MART process involves combining functional proteins with protective sugars, specifically trehalose and dextran, and drying the resulting solution onto a biocompatible cellulose fiber matrix at room temperature or slightly elevated temperatures around 30 °C. The drying can be achieved using either circulating dry air (MART-DA) or a vacuum (MART-V), entirely bypassing the freezing step that often damages sensitive biomolecules. The core principle of MART lies in the formation of microscopic 'capillary bridges' between the cellulose fibers. As the sugar solution dries, it creates thin films that gently encase the proteins, preserving their three-dimensional structure and, consequently, their biological function. This mechanism was successfully validated using four distinct, temperature-sensitive targets, representing a range of biological complexity and application: the enzyme lactate dehydrogenase (LDH), the cell-growth-promoting fibroblast growth factor 2 (FGF-2), and the complex enzyme mixture (reverse transcriptase and Bst 2.0 polymerase) used in COVID-19 RT-LAMP diagnostic tests. LDH, when dried using MART, retained over 90% of its activity after six months of storage at 25 °C, effectively matching the performance of conventional frozen storage. Furthermore, FGF-2, dried using this innovative method, remained biologically active. Upon reconstitution after a week at 40 °C, it promoted stem cell proliferation with comparable effectiveness to FGF-2 stored at -80 °C. Moreover, the complete RT-LAMP reagent set, crucial for COVID-19 detection, was successfully thermostabilized, retaining its sensitivity to detect viral RNA even after being stored at 40 °C for a week. \This novel MART drying method presents several significant advantages over the established freeze-drying process, also known as lyophilization. It drastically reduces processing time, from a day or more to as little as three hours when using a vacuum, and significantly lowers energy consumption. Importantly, it eliminates the need for expensive, specialized equipment. The use of a soft cellulose matrix also addresses the brittleness issues associated with earlier glass-fiber prototypes, enhancing safety and adaptability for direct applications. This includes the potential to embed growth factors directly into wound dressings, paving the way for advanced medical applications. The implications of this research are far-reaching. By enabling the long-term, room-temperature storage of crucial biologics, MART drying promises to broaden access to advanced diagnostics and treatments, particularly in resource-limited settings. It simplifies complex supply chains, reducing waste and improving efficiency. The reduction in reliance on refrigeration also contributes to a significant decrease in the biopharmaceutical industry's global carbon footprint, promoting a more sustainable approach to healthcare. The development and implementation of MART drying technologies hold immense promise for transforming the landscape of global healthcare delivery, making essential medicines and diagnostic tools more accessible, affordable, and environmentally friendly. This innovation represents a major step forward in addressing the challenges posed by the cold chain, and improving global health outcomes.\The research underscores the transformative potential of MART drying for the biopharmaceutical and diagnostic sectors. The ability to preserve the integrity and activity of sensitive biomolecules at room temperature offers unprecedented opportunities for expanding access to healthcare, particularly in developing countries. The simplified storage and transportation requirements eliminate the need for costly and energy-intensive refrigeration infrastructure, making treatments and diagnostics more accessible to underserved populations. The success of MART drying with diverse protein targets, including enzymes and growth factors, demonstrates the versatility and broad applicability of this technology. The long-term stability and maintained activity of these proteins under room-temperature conditions represent a breakthrough in the development of thermostable biologics. This research provides a robust platform for the development of new therapeutics and diagnostic tools, and opens new avenues for innovation in fields such as regenerative medicine, personalized medicine, and infectious disease diagnostics. Furthermore, the environmentally friendly nature of MART drying, due to its reduced energy consumption and elimination of refrigerant reliance, aligns with the growing need for sustainable healthcare practices. The development of MART drying technologies exemplifies the power of scientific innovation to overcome global health challenges, contributing to a healthier and more equitable world. The potential impact of this technology extends beyond healthcare, offering potential applications in agriculture, environmental science, and other fields that rely on the preservation of sensitive biological materials. This research highlights the critical importance of investing in scientific research to address pressing global issues and improve the lives of people worldwide. This innovative drying technique is poised to revolutionize the way we store, transport, and utilize critical biological products, leading to significant advancements in healthcare accessibility and environmental sustainability
Room-Temperature Drying Protein Stability Biologics Storage Cold Chain Biotechnology
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