For years, lyophilization has been employed in the diagnostic and pharmaceutical industries to prepare reagents in vials or bulk trays. However, these formats are not ideal for point-of-care diagnostics. Lyophilized beads (also known as “lyo beads”) have emerged as a solution, offering easier handling while preserving the advantageous properties of the lyophilization process.
Lyo beads extend the shelf life of biological molecules, simplifying storage and transportation. Their compact size reduces overall costs compared to traditional glass vials or microfluidic-encased lyophilized reagents. Moreover, lyo beads provide superior rehydration characteristics, contributing to an improved performance-to-cost ratio. They also minimize cold chain requirements and stabilize sensitive biological materials.
In recent years, lyo beads have gained traction for use in point-of-care diagnostics. Initially developed for PCR master mixes in molecular diagnostics, rapid diagnostics and point-of-care assay developers have started to recognize their unique benefits, such as rapid rehydration, easy handling, and minimal liquid handling steps.
Lyophilized Beads in Molecular Diagnostics
Lyophilized beads are versatile and their applications diverse, capitalizing on benefits like biological stabilization, cold chain storage elimination, and quick rehydration. They typically contain liquid volumes of 5 to 40µL, while maintaining high reproducibility.
In molecular diagnostics, lyo beads can be used to stabilize enzymes and reagents for PCR or LAMP (loop-mediated isothermal amplification). They can be stored in simple 0.2mL PCR tubes or integrated directly into microfluidic cartridges for automated testing at point-of-care or home locations. As automation improves, the placement of lyo beads into disposable microfluidic cartridges is becoming an industry standard.
Lyophilized Beads in Point-of-Care Diagnostics
Lyo beads can be utilized for point-of-care immunoassay diagnostics in various ways, including sample pretreatment, sample incubation, and air-dried conjugate replacement. They are an efficient method for adding sensitive biologicals or non-sensitive reagents to a sample without dilution, streamlining liquid handling steps and taking advantage of bead-dispensing equipment’s precision. Lyo beads’ rapid rehydration mimics liquid reagent transfers without causing dilution or pipetting errors, minimally impacting the assay workflow.
Lyo beads can also enhance incubation time between the nanoparticles (or other reporter labels) and the analyte contained in the sample. This can be achieved by adding the lyophilized bead (containing the reporter label) directly to the sample before adding it to the diagnostic assay, thereby extending the incubation time to maximize assay sensitivity within the given time constraints. This method also improves assay precision, yielding lower assay CVs when using lyo beads compared to air-dried conjugate or microfluidic time gating.
By replacing the conjugate pad with a lyophilized bead, conjugate rehydration and nanoparticle release can be enhanced, offering performance similar to lyophilizing the entire conjugate pad without the need for the entire pad’s freeze dryer footprint. This approach reduces costs while maintaining high performance of your immunoassay.
DCN Dx Optimizes Your Reagent Lyophilization Process
At DCN Dx, our proficiency in assay development, reagent lyophilization, and engineering results in a coordinated approach to your diagnostic’s development. Our collaborative environment enables the seamless integration of lyophilized reagents into assays and devices. Our team of accomplished scientists and engineers works in tandem to bring your product vision to life, ensuring that the characteristics of lyophilized beads, such as diameter/volume, physical robustness, and rehydration properties, operate within the fluidic parameters of the device and conform to space constraints and manufacturing methods.
Our meticulous development process for lyophilized beads adheres to standard design control procedures, encompassing feasibility, verification, and validation phases prior to transitioning to manufacturing. We initiate assay development with wet chemistry before transitioning to lyophilized reagents and integrating them directly into the final device. This streamlined approach consolidates all processes within a single development program at one site, ensuring a unified source of accountability.
Choose DCN Dx to incorporate lyophilized bead technology into your existing or new diagnostic assay. To discover more about our capabilities and how we can support your project, contact us today.
About DCN Dx
DCN Dx is a global leader in the design, development, and manufacture of point-of-use diagnostics. Based in Carlsbad, California, our multidisciplinary team of scientists and engineers collaborates to create and integrate comprehensive assay systems, consumables, and instruments tailored for point-of-use applications. These reliable systems empower users to detect and quantify biomarkers and pathogens, thereby facilitating the timely delivery of treatments.
We partner with both biotech start-ups and established industry leaders to develop state-of-the-art rapid diagnostic tests. Our clinical research services and engineering teams ensure that products are designed with a focus on usability, manufacturability, and high-performance capabilities. Our experience encompasses a range of segments and applications, including clinical point-of-care testing, veterinary diagnostics, bioprocessing, soil and water testing, food safety, force protection, and more.
DCN Dx is committed to delivering innovative solutions and exceptional service to meet the diverse needs of our clients. To learn more, visit dcndx.com.
