The PR2121-H-100 is the High ROX formulation of the Accuris qMAX Probe One-Step RT-qPCR Kit — sold as 100-reaction entry pack. The probe-based sister chemistry to the PR2120 qMAX Green One-Step RT-qPCR family — combines reverse transcription (RT) + sequence-specific probe-based qPCR in a single-tube workflow for RNA → quantitative-DNA-readout in one tube with TaqMan / Scorpion / molecular beacon hydrolysis-probe detection. The High ROX formulation is for ABI 7300 / 7500 Standard / 7700 / 7900 cyclers.
Key Specifications
| SKU | PR2121-H-100 |
| Type | Single-tube One-Step RT-qPCR Kit — qMAX Probe chemistry, High ROX |
| Pack quantity | 100 reactions |
| Workflow | RT + qPCR in single tube — RNA template → sequence-specific qPCR readout in one tube |
| Detection chemistry | Probe-based — compatible with TaqMan, Scorpion, and molecular beacon hydrolysis probes |
| Kit contents | 1 tube of 20X thermostable MMLV-derived RTase (RNase inhibitor included) + 1 tube of 2X Probe One-Step Mix (Hot Start Taq + dNTPs + optimized buffer) |
| ROX level | High ROX — ABI 7300 / 7500 Standard / 7700 / 7900 cyclers |
| Hot Start chemistry | Included via Hot Start Taq |
| RNase inhibitor | Included in the RTase tube |
| Sister chemistry | PR2120 family (qMAX Green One-Step RT-qPCR — intercalating-dye SYBR-class) |
| Sister ROX variants (same pricing) | PR2121-N-100 (No ROX), PR2121-L-100 (Low ROX) |
| Sister pack sizes | PR2121-H-S (sample, $14), PR2121-H-500 ($821), PR2121-H-1000 ($1,506) |
| Higher-multiplex sister chemistry | PR2122 (qMAX Probe Multiplex), PR2124 (qMAX Probe Multiplex 4×) |
| List price | $189 |
Probe-Based vs Intercalating-Dye One-Step RT-qPCR Decision
The Accuris qMAX One-Step RT-qPCR family includes two parallel chemistry options:
| Chemistry | Family | How it works | Best for |
| Intercalating dye (SYBR class) | PR2120 qMAX Green One-Step | Green dye binds dsDNA; fluoresces during qPCR | Single-target gene expression with well-validated primers |
| Probe-based (this product family) | PR2121 qMAX Probe One-Step | Sequence-specific probe with fluorophore + quencher; probe degraded during qPCR releases fluorophore | Sequence-specific RT-qPCR; clinical-research diagnostic; viral RNA quantification with probe specificity |
Pick the qMAX Probe One-Step (PR2121) chemistry when:
- The workflow needs sequence-specific detection beyond what primer-pair specificity alone provides
- Pathogen ID workflows where primer-pair non-specifics would compromise calls
- Clinical-research diagnostic workflows where probe-based specificity is the standard
- Multi-target RT-qPCR multiplex (step to PR2122 for explicit multiplex chemistry)
Pick the qMAX Green One-Step (PR2120) chemistry when:
- Workflow is single-target gene expression with well-validated primers
- Probe-cost is prohibitive
- HRM (high-resolution melt) downstream analysis is part of the workflow
qMAX Probe RT-qPCR Multiplex Family
For multi-target probe-based RT-qPCR workflows, step to:
| Family | Multiplex capacity | Use case |
| PR2121 qMAX Probe One-Step (this product family) | Single-target | One target per reaction with probe specificity |
| PR2122 qMAX Probe One-Step Multiplex | Multi-target (typical 2–3 targets) | Multiplex panels with multiple fluorophore-labeled probes |
| PR2124 qMAX Probe One-Step Multiplex 4× | 4-target multiplex | High-multiplex panels — 4 targets per reaction |
ROX Formulation Selection
Same as PR2120 / PR2000 / PR2001 family — three ROX-level formulations:
| ROX Formulation | Suffix | Compatible cyclers |
| No ROX | -N | Bio-Rad CFX, Roche LightCycler, Eppendorf realplex, Stratagene Mx, Qiagen Rotor-Gene |
| Low ROX | -L | ABI ViiA 7, QuantStudio 6/7/12K, ABI 7500 Fast block |
| High ROX (this product) | -H | ABI 7300, 7500 Standard, 7700, 7900 |
Pack-Size Family
| SKU | Reactions | List price | Per-reaction cost |
| PR2121-H-S | 10 (sample) | $14 | $1.43 |
| PR2121-H-100 (this product) | 100 | $189 | $1.89/rxn |
| PR2121-H-500 | 500 | $821 | $1.64/rxn |
| PR2121-H-1000 | 1000 | $1,506 | $1.51/rxn |
Application Profile
Sequence-specific RT-qPCR for clinical-research diagnostics — pathogen RT-qPCR, viral-load quantification, mutation-detection assays where probe-based specificity is the standard.
Viral RNA quantification (research-use) — pathogen-detection workflows where one-step probe chemistry combines workflow simplification + sequence-specificity.
Single-target gene expression with reference-gene-aware design — workflows running probe-based detection for a single target (multiplex with reference gene = step to PR2122).
Method-development RT-qPCR — protocol-development workflows where probe-based detection is optimized.
Multi-investigator clinical-research labs — facilities running standardized probe-based RT-qPCR protocols benefit from the One-Step format's reduced contamination risk vs Two-Step.
Ordering & Configuration
Per-reaction workflow consumable. Each One-Step RT-qPCR reaction consumes proportional reagent.
Probe inventory. Operator supplies sequence-specific probe (TaqMan / Scorpion / molecular beacon — typically purchased separately from probe-synthesis vendors per assay design).
Cycler-compatibility confirmation. High ROX is for Standard-block ABI 7000-series cyclers.
Storage. -20 °C, protect from light. RNase-free handling required throughout.
Pair with RNA template + sequence-specific primers + probe. The kit includes the polymerase + RT + buffer + dNTPs + RNase inhibitor + ROX; operator supplies RNA template, primer pair, and labeled probe.
Confirm at quote: cycler ROX requirement, workflow throughput, evaluation interest (PR2121-H-S sample), one-step vs two-step decision, multiplex panel design (vs PR2122 / PR2124 if multi-target needed), and lead time.
Warranty: Per Accuris standard reagent terms — confirm at quote.
Accuris PR2121 qMAX Probe One-Step RT-qPCR Kit family — High ROX:
- PR2121-H-S — Sample, 10 reactions ($14)
- PR2121-H-100 (this product) — 100 reactions ($189, $1.89/rxn)
- PR2121-H-500 — 500 reactions ($821, $1.64/rxn)
- PR2121-H-1000 — 1000 reactions ($1,506, $1.51/rxn)
Pick the qMAX Probe One-Step for sequence-specific RT-qPCR / clinical-research diagnostic / viral RNA quantification; sister chemistry PR2120 (Green) covers SYBR-class workflows; sister chemistries PR2122 / PR2124 cover multi-target multiplex.