Ready-To-Go PCR Beads Versus GoTaq Green Master Mix: Which PCR Format Fits Your Lab?
Ready-To-Go PCR Beads vs GoTaq Green Master Mix
Ready-To-Go PCR beads versus GoTaq Green Master Mix is really a choice between two formats: a dry, room-temperature bead and a frozen, ready-to-use liquid. Both let you simply add template and primers, and both deliver the same core reaction chemistry. Where they differ is storage, reaction volume, workflow and what happens after amplification.
This comparison uses each manufacturer's published specifications for Cytiva's illustra™ PuReTaq Ready-To-Go™ PCR Beads and Promega's GoTaq® Green Master Mix. At EVIK, we make lyophilized reagent beads, so we have also included a third option for labs that want bead convenience with their own chemistry.
Need a bead built around your own PCR mix?
Email info@evikdiagnostics.com or contact our Lyo expert team to discuss a custom or white-label formulation.
The Quick Answer
Ready-To-Go PCR Beads
Choose these when room-temperature storage, shipping without a freezer and minimal pipetting matter most, and a fixed 25 µL reaction suits your workflow.
GoTaq Green Master Mix
Choose this when you run routine gel-based PCR, want to load reactions straight onto a gel and need flexibility to change reaction volumes.
Custom Lyophilized Beads
Consider these when you want ambient storage but need your own formulation, qPCR or LAMP chemistry, white-label product or different packaging format.
At a Glance: Ready-To-Go PCR Beads vs GoTaq Green Master Mix
| Feature | illustra™ PuReTaq Ready-To-Go™ PCR Beads (Cytiva) | GoTaq® Green Master Mix (Promega) |
|---|---|---|
| Format | Lyophilized bead, pre-dispensed in a PCR tube | 2X liquid master mix |
| Polymerase | About 2.5 units of recombinant PuReTaq DNA polymerase per bead | GoTaq DNA Polymerase, Promega's proprietary formulation of Taq |
| What you add | Template DNA, primers and water | Template DNA, primers and nuclease-free water |
| Reaction volume | 25 µL per bead | Flexible; Promega quotes reaction numbers on a 50 µL basis |
| Final MgCl₂ | 1.5 mM | 1.5 mM (3 mM in the 2X mix) |
| Final dNTPs | 200 µM each | 200 µM each (400 µM in the 2X mix) |
| Buffer | 10 mM Tris-HCl, pH 9.0, 50 mM KCl, with BSA and stabilizers | Proprietary Green GoTaq Reaction Buffer, pH 8.5 |
| Tracking dyes | None listed | Blue and yellow dyes for direct gel loading |
| Storage | Room temperature, in an airtight foil pouch with desiccant | Frozen for long-term storage; follow the label for refrigerated limits |
| Formats | 0.2 mL tubes (hinged cap or tube/plate) and 0.5 mL tubes | Tubes of 2X mix with nuclease-free water |
| Pack sizes | 96, 100 and 480 reactions | 100 and 1,000 reactions |
| Stated applications | Standard PCR; verified for real-time PCR | Endpoint PCR; validated for two-step RT-PCR workflows |
Format and Storage
This is the biggest practical difference. Ready-To-Go PCR beads are freeze-dried and stored at room temperature in a foil pouch with desiccant, so they need no freezer space and ship without a cold chain. GoTaq Green Master Mix is a liquid that is stored frozen for long-term use and thawed and vortexed before each setup.
For a remote site, a field kit or a lab short on freezer space, that difference can decide the choice on its own. For a busy lab with freezers close to the bench, it matters less.
If you choose beads, read our guide to lyophilized bead handling to learn how to keep them dry and intact. Our article on the features of lyophilized beads covers the wider benefits of the format.
Reaction Setup and Workflow
Ready-To-Go PCR Beads
Each bead is designed for one 25 µL reaction. Add primers, template and water to reach 25 µL, and the bead dissolves into a complete reaction. The pre-dispensed format means fewer pipetting steps and fewer opportunities for error or contamination.
GoTaq Green Master Mix
Because it is a 2X solution, combine equal volumes of master mix and the other reaction components. Promega's protocol gives examples for 25, 50 and 100 µL reactions, so you can scale the volume to suit the experiment.
Reaction Chemistry Compared
The core chemistry is closer than many people expect. At 1X, both systems deliver 1.5 mM MgCl₂ and 200 µM of each dNTP. The differences are in the details: the Ready-To-Go bead uses a pH 9.0 Tris-HCl and KCl buffer with BSA, while GoTaq Green uses a proprietary pH 8.5 buffer.
Both are built around Taq-type polymerases. Promega also offers hot-start and second-generation (G2) GoTaq master mixes as separate products if you need them.
Downstream Analysis
GoTaq Green: Direct-to-Gel Analysis
GoTaq Green Master Mix is designed for direct-to-gel analysis. Reactions are dense enough to load straight onto an agarose gel. The blue dye runs with 3–5 kb fragments in a 1% agarose gel, while the yellow dye runs ahead of the primers (under 50 bp).
If you plan to analyze products by fluorescence or absorbance without purifying them first, Promega recommends its GoTaq Colorless Master Mix, which has the same formulation without the dyes.
Ready-To-Go Beads: Add Your Loading Buffer
Ready-To-Go PCR beads list no tracking dyes, so you add your own loading buffer before running a gel. Cytiva states that the beads are verified for real-time PCR.
New to qPCR? Explore our guides explaining how qPCR works, qPCR vs RT-qPCR and the function of primers in a PCR reaction.
Which Should You Choose?
| Your Situation | Better Fit |
|---|---|
| Routine gel-based genotyping or teaching labs | GoTaq Green Master Mix |
| Field work, shipping or limited freezer space | Ready-To-Go PCR beads |
| Variable or non-standard reaction volumes | GoTaq Green Master Mix |
| Minimizing pipetting and contamination risk | Ready-To-Go PCR beads |
| Fluorescence or absorbance analysis after PCR | GoTaq Colorless Master Mix or a suitable bead format |
| Building a commercial assay, kit or point-of-care device | A custom lyophilized bead |
A Third Option: Custom Lyophilized Master Mix Beads From EVIK
Both products above are fixed, catalog formulations. If you want the ambient stability of a bead but with your own chemistry, volume or branding, a custom or white-label lyophilized bead is the next step.
Ready-Made qPCR and LAMP Beads
EVIK™ RT-qPCR Master Mix DxSpheres and EVIK™ RT-LAMP Master Mix DxSpheres are preformulated, single-reaction, white-label beads that contain every component except your primers, probes and template.
They come in a 96-well plate or sets of three 8-strip PCR tubes, and can be customized for specific reaction volumes or formulations.
Custom Packaging
Request a custom packaging quote from 960 beads. Our team aims to reply within 72 hours.
Your Own Formulation
Our team can transfer many molecular assay components into a single-reaction bead, including enzymes, primers and probes, buffers and dyes.
Start by screening stabilizers with our EVIK™ Excipient Selection Plates, which support PCR, LAMP, RPA and CRISPR assays.
Designed for Stability
Our diagnostic lyobeads offer a stated shelf life of 24+ months at 15–30°C and reconstitute in under a minute. They are manufactured in an ISO 13485:2016-certified facility.
For the full development path, read our guide to the lyophilized assay reagent format. Comparing bead and cake formats? See lyophilized beads vs cakes or explore in-house lyophilization vs outsourcing.
You can also browse all Master Mix Beads.
Want room-temperature beads with your chemistry?
Send us your assay details or email info@evikdiagnostics.com to discuss a custom or white-label solution.
Frequently Asked Questions
Is GoTaq Green Master Mix lyophilized?
No. It is a 2X liquid master mix that is stored frozen for long-term use and thawed before setup.
Do Ready-To-Go PCR beads need a freezer?
No. Cytiva specifies storage at ambient room temperature in an airtight foil pouch with desiccant.
Can I load GoTaq Green reactions directly onto a gel?
Yes. The reactions are dense enough for direct loading, and the blue and yellow dyes let you track electrophoresis.
What reaction volume do Ready-To-Go PCR beads use?
Each bead is designed for a 25 µL reaction. GoTaq Green Master Mix can be scaled to different volumes, such as 25, 50 or 100 µL.
Are the reaction chemistries similar?
Yes, at the core. Both give 1.5 mM MgCl₂ and 200 µM of each dNTP in the final reaction, with different buffers: pH 9.0 for the bead and pH 8.5 for GoTaq Green.
Ready-To-Go PCR beads versus GoTaq Green Master Mix: which is better for kits and devices?
For commercial kits and point-of-care devices, a room-temperature bead is often a useful starting point, ideally one formulated and packaged for your own assay. A custom lyophilized bead can be designed around those requirements, subject to formulation feasibility and validation.
Ready-To-Go PCR Beads vs GoTaq Green Master Mix: The Bottom Line
Pick GoTaq Green Master Mix for flexible, gel-based benchwork, and pick Ready-To-Go PCR beads when room-temperature storage and fewer pipetting steps matter more. If neither catalog product fits your assay, volume or brand, a custom lyophilized bead gives you the convenience of the bead format with the chemistry you choose.
Build a Custom PCR Bead Around Your Assay
Tell us about your assay, formulation and intended use. Our team can discuss the feasibility of a custom or white-label lyophilized master mix bead for your development program.
To help us assess your project, share:
- Your assay type, such as PCR, qPCR, RT-qPCR or LAMP
- Your current master mix or target formulation
- Your required reaction volume
- Your preferred packaging and bead count
- Your storage, stability and shelf-life targets
- Your evaluation, pilot and commercial volume requirements
Email info@evikdiagnostics.com to contact our Lyo expert team.
illustra, PuReTaq and Ready-To-Go are trademarks of Cytiva. GoTaq is a registered trademark of Promega Corporation. EVIK is not affiliated with either company. Specifications are based on the manufacturers' published product information and may change. Always consult current product documentation before making purchasing or experimental decisions.