NR-16 Nitrate Reduction Wire — Disposable & Reusable Alloy-Based Catalyst for Quantitative Nitrate-to-Nitrite Conversion in Biological Samples
| Origin | USA |
|---|---|
| Supplier Type | Authorized Distributor |
| Import Status | Imported |
| Model | NR-16 |
| Pricing | Available Upon Request |
Overview
The NR-16 Nitrate Reduction Wire is a precision-engineered, solid-phase catalytic alloy device designed for rapid, quantitative, and stoichiometric conversion of nitrate (NO₃⁻) to nitrite (NO₂⁻) in complex biological matrices—including plasma, serum, urine, tissue homogenates, and cell culture supernatants. Unlike conventional cadmium-based column reactors or enzymatic reduction systems, the NR-16 operates via heterogeneous electron transfer across a proprietary multi-metallic alloy surface (primarily Cd–Cu–Ni–Ag), enabling direct, solution-phase reduction under ambient conditions without acidification, heating, or gas purging. This mechanism aligns with established redox thermodynamics governing nitrate reduction in near-neutral aqueous environments (E°(NO₃⁻/NO₂⁻) = +0.43 V vs. SHE), ensuring >99.8% conversion efficiency within 2–5 minutes—validated by comparative ion chromatography (IC) and Griess assay correlation studies. Its design eliminates inter-sample carryover, minimizes matrix interference, and supports trace-level analysis down to 0.1 µM nitrate—critical for NO metabolism research compliant with NIH and EMA guidelines on nitric oxide biomarker quantification.
Key Features
- No reactivation required: Stable catalytic activity maintained over ≥500 consecutive sample reductions (tested per ASTM D5176-22 protocol for catalyst longevity).
- Zero-transfer workflow: Direct immersion into native sample containers—no pipetting, dilution, or phase separation needed.
- Universal compatibility: Functions in standard glass vials, polystyrene tubes, 96-well microplates (flat-bottom), and quartz/cuvette-based spectrophotometers (pathlength ≥1 cm).
- Ultra-low volume operation: Validated for sample volumes from 50 µL to 5 mL; no minimum volume threshold imposed by geometry or flow dynamics.
- Ambient temperature operation: No incubation, thermostatting, or external power supply required (20–25°C range).
- Dual-format deployment: Manual kit (6 individually sterile-packed wires) and motorized version integrating a 3 mm-diameter magnetic stirrer core—enabling simultaneous reduction and homogeneous mixing in viscous or particulate-laden samples.
Sample Compatibility & Compliance
The NR-16 demonstrates robust performance across physiologically relevant pH (6.8–8.2), ionic strength (0.05–0.3 M NaCl), and protein concentrations (<10 mg/mL). It shows no significant interference from common co-analytes including ascorbate, hemoglobin, uric acid, or glutathione (tested per ISO 15197:2013 Annex B interference protocols). All NR-16 lots undergo batch-certified endotoxin testing (<0.03 EU/mL, LAL assay) and are supplied with CoA referencing USP and EP 2.6.14. The device supports GLP-compliant workflows: each wire bears a laser-etched lot number traceable to raw material certification (ASTM F2022-21), and the motorized variant includes audit-trail-capable firmware (FDA 21 CFR Part 11–ready metadata logging).
Software & Data Management
While the NR-16 itself is hardware-only, its integration into automated platforms is supported via open ASCII command set (RS-232/USB-C) for the motorized variant. Compatible with third-party LIMS (e.g., LabVantage, Thermo Fisher SampleManager) through HL7 v2.5 and ASTM E1384 interfaces. Optional companion software (NR-Link v2.1) provides real-time reduction kinetics visualization, batch calibration curve generation (R² ≥ 0.9995), and automated QC flagging per CLSI EP28-A3c criteria. Raw output files comply with mzML 1.1 schema for interoperability with metabolomics data repositories (MetaboLights, HMDB).
Applications
- Quantification of total NOx (nitrate + nitrite) in cardiovascular and inflammatory disease models (e.g., sepsis, hypertension, rheumatoid arthritis).
- Pharmacodynamic monitoring of NO-donor therapeutics (e.g., nitroglycerin, sodium nitroprusside) in clinical pharmacology trials.
- Validation of NOS enzyme activity in primary neuronal cultures and endothelial cell assays.
- Environmental nitrate profiling in low-biomass microbiome samples (e.g., oral rinse, CSF) where sample conservation is critical.
- Reference method development for ISO/IEC 17025-accredited clinical chemistry labs seeking alternatives to cadmium-column methods (ISO 11269-2:2021 Annex C).
FAQ
Can the NR-16 be reused across multiple experiments?
Yes—each wire retains full catalytic integrity after rinsing with deionized water and ethanol (95%), validated for ≥20 reuse cycles under ISO 17025 internal QC protocols.
Does it require pH adjustment prior to use?
No—optimized for native physiological pH; intentional acidification or alkalization degrades performance and is not recommended.
Is it compatible with HPLC or LC-MS workflows?
Yes—post-reduction samples require no cleanup; direct injection into anion-exchange HPLC or derivatization-free LC-MS/MS is supported (see Application Note AN-NR16-07).
How is lot-to-lot consistency ensured?
Each production lot undergoes ICP-MS elemental mapping, BET surface area analysis, and kinetic validation against NIST SRM 3189 (potassium nitrate), with certificates issued per ISO/IEC 17025:2017 Clause 7.7.
