ATAGO RX-5000α Collagen Concentration Refractometer
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | RX-5000α |
| Instrument Type | Benchtop Refractometer |
| Temperature Control | Peltier-based thermostatic control |
| Display | Digital LCD |
| Measurement Range | Refractive Index (nD): 1.32700–1.58000 |
| Brix | 0.00–100.00% |
| Accuracy | ±0.00004 (nD), ±0.03% (Brix) |
Overview
The ATAGO RX-5000α Collagen Concentration Refractometer is a high-precision, benchtop optical instrument engineered for the rapid, non-destructive quantification of collagen concentration in aqueous solutions via measurement of refractive index (nD). Based on the fundamental physical principle that the refractive index of a homogeneous solution exhibits a stable, empirically calibrated correlation with solute concentration—particularly for macromolecular biopolymers such as collagen—the RX-5000α leverages Abbe-type optical architecture combined with a high-resolution CCD detector and temperature-stabilized prism system. This enables direct conversion of measured nD values into collagen mass fraction (expressed as % w/w or Brix-equivalent units) without chemical reagents, sample dilution, or derivatization. The instrument is specifically optimized for collagen-rich matrices encountered in biomedical research, cosmetic formulation development, pharmaceutical excipient QC, and functional food manufacturing—where trace-level consistency, batch-to-batch reproducibility, and regulatory traceability are critical.
Key Features
- Peltier-driven thermostatic control (±0.1 °C stability) ensures measurement repeatability across ambient temperature fluctuations, complying with ISO 21542 and ASTM D1218 requirements for temperature-sensitive optical measurements.
- Dual-scale digital readout simultaneously displays refractive index (nD) and Brix (%), with user-selectable calibration curves—including collagen-specific polynomial calibration protocols validated against gravimetric reference standards.
- High-accuracy optical path design achieves ±0.00004 refractive index resolution and ±0.03% Brix accuracy over full range (0.00–100.00%), meeting internal QC thresholds for GLP-compliant laboratories.
- Robust stainless-steel sample stage with ergonomic prism cover and integrated LED illumination minimizes operator-induced variability and supports rapid cleaning between samples.
- Auto-zero function with built-in distilled water reference mode enables daily verification without external calibration kits, reducing operational downtime and consumable dependency.
Sample Compatibility & Compliance
The RX-5000α accommodates viscous, thermally sensitive, and low-volume collagen solutions—including acid-solubilized type I collagen, enzymatically hydrolyzed peptides, and cross-linked hydrogels—provided turbidity remains below 5 NTU to maintain optical path integrity. Sample volume requirement is 0.3–0.5 mL per measurement. The instrument conforms to IEC 61010-1 safety standards and supports audit-ready documentation under FDA 21 CFR Part 11 when paired with ATAGO’s optional PC interface software (RefractoLink v4.2). Calibration records, measurement logs, and temperature traceability data are timestamped and exportable in CSV or PDF format for quality assurance review. It is routinely deployed in facilities operating under ISO/IEC 17025, USP , and EP 2.2.2 compliance frameworks.
Software & Data Management
RefractoLink software (sold separately) provides bidirectional USB communication, enabling automated data capture, statistical process control (SPC) charting, and multi-user permission management. Each measurement event is tagged with operator ID, sample ID, ambient temperature, prism temperature, and calibration status. Audit trails record all parameter modifications, including calibration coefficient updates, in accordance with ALCOA+ principles. Raw nD and Brix values are stored with 6-digit decimal precision; trend analysis tools support long-term stability monitoring of collagen stock solutions across storage conditions.
Applications
- Quantitative release testing of collagen-based wound dressings and tissue-engineered scaffolds.
- In-process concentration verification during ultrafiltration and diafiltration steps in collagen purification workflows.
- Stability-indicating assay for thermal denaturation studies (e.g., monitoring triple-helix dissociation onset via refractive index shift).
- Raw material acceptance testing of marine/fish-derived collagen powders prior to reconstitution.
- Formulation development of collagen-peptide beverages, where Brix correlates with total soluble protein content under controlled pH and ionic strength.
FAQ
Can the RX-5000α measure collagen concentration directly without a custom calibration curve?
No. While the instrument outputs Brix as a default scale, accurate collagen quantification requires application-specific calibration using certified reference materials traceable to NIST SRM 999b or equivalent collagen standards.
Is the Peltier temperature control sufficient for measurements at 37 °C to simulate physiological conditions?
Yes—the system maintains setpoint stability within ±0.1 °C from 10 °C to 50 °C, supporting physiologically relevant assays without external water baths.
Does the instrument comply with pharmacopeial methods for collagen assay?
It supports method adaptation per USP and EP 2.2.2 for refractometric concentration determination, though final method validation must be performed by the end user per ICH Q2(R2).
How often does the prism require cleaning or recalibration?
Prism cleaning is recommended after each sample series using lint-free wipes and ethanol; full calibration verification is advised daily or per shift, using ATAGO-certified reference fluids (e.g., nD = 1.33300 at 20 °C).
