Oxidograph Oil Oxidation Stability Analyzer
| Origin | Denmark |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | Oxidograph |
| Pricing | Available Upon Request |
Overview
The Oxidograph Oil Oxidation Stability Analyzer is a precision-engineered instrument designed for the accelerated assessment of oxidative stability in edible oils, fats, and lipid-containing food matrices. It operates on the principle of **pressure-drop oxygen consumption measurement**—a gravimetrically referenced, static-head method where oxidation is monitored in real time by detecting minute changes in headspace pressure as molecular oxygen is consumed during thermal oxidation. Unlike dynamic airflow-based systems (e.g., Rancimat), the Oxidograph maintains a sealed, non-ventilated reaction environment, eliminating mass-transfer artifacts and foam formation while delivering highly reproducible induction period (IP) data under controlled isothermal or programmed temperature conditions. Developed by Fira-Astell as an evolution of the classical Sylvester test, it integrates robust thermal management, high-fidelity pressure transduction, and analog signal architecture compatible with GLP-compliant data acquisition workflows.
Key Features
- Static-head oxidation monitoring: Eliminates forced-air flow interference, ensuring direct correlation between O₂ consumption and peroxidation kinetics.
- Integrated aluminum heating block: Provides uniform temperature distribution across six independent sample positions (30–199 °C range, ±0.1 °C stability via zero-crossing solid-state relay control).
- Magnetic stirring (1 rpm): Ensures homogeneous thermal and oxidative exposure without mechanical seal wear or contamination risk.
- Sealed glass reaction vessels: Chemically inert borosilicate construction; no oil-sealing required at vessel interfaces; rapid disassembly and cleaning.
- High-resolution pressure sensing: Differential piezoresistive transducers deliver linear 0–5 V analog output per channel (6 channels total), synchronized with temperature analog output (also 0–5 V).
- Modular signal compatibility: Supports both ML Paralog software (Windows-based, timestamped, multi-channel logging with IP calculation algorithms) and external 6-channel potentiometric chart recorders (20 mm/h sweep speed).
Sample Compatibility & Compliance
The Oxidograph accommodates standard 10–15 mL oil/fat samples—including refined vegetable oils (soybean, sunflower, palm), animal fats (lard, tallow), marine oils (fish oil, krill oil), and formulated emulsions. Its static methodology complies with foundational principles outlined in AOCS Cd 12b-92 (Induction Period by Pressurized Differential Scanning Calorimetry) and aligns with ISO 6886:2016 (Animal and vegetable fats and oils — Determination of oxidative stability — Rapid method using pressurized differential scanning calorimetry), though formal certification requires user validation per laboratory SOPs. The instrument’s analog signal architecture supports audit-ready traceability when paired with 21 CFR Part 11–compliant data acquisition systems (e.g., validated Paralog configurations with electronic signatures and audit trails). All wetted parts meet USP Class VI biocompatibility requirements for food-grade contact.
Software & Data Management
ML Paralog software serves as the primary interface for real-time visualization, parameter configuration, and automated induction period determination. It records synchronized pressure decay curves alongside temperature profiles, applies baseline correction and first-derivative analysis to identify the inflection point corresponding to rapid oxidation onset, and exports CSV/Excel-compatible datasets with metadata (sample ID, operator, date/time, setpoint, ambient RH). Raw analog outputs (6 × pressure + 1 × temperature) are fully scalable and can be integrated into LIMS or SCADA environments via standard analog-to-digital converters. No cloud dependency or proprietary firmware locks are imposed—users retain full ownership of raw voltage-time series for secondary modeling (e.g., Arrhenius activation energy estimation).
Applications
- Quality control of incoming crude and refined oils for antioxidant efficacy screening (BHA, BHT, TBHQ, tocopherols, rosemary extract).
- Stability benchmarking of new lipid formulations (e.g., omega-3 fortified foods, plant-based dairy alternatives).
- Accelerated shelf-life prediction under elevated temperature stress (e.g., 110 °C for frying oil degradation modeling).
- Regulatory dossier support for GRAS notifications and EFSA/FDA food additive petitions requiring oxidative stability evidence.
- Method development and cross-validation against Rancimat (AOCS Cd 12b-92), OSI (AOCS Cd 12c-92), and DSC-based protocols.
FAQ
What distinguishes Oxidograph from Rancimat-type instruments?
The Oxidograph uses static-head pressure drop detection, whereas Rancimat relies on conductivity changes in a scrubbing solution under continuous air flow—making Oxidograph results less sensitive to volatile acid composition and more directly reflective of oxygen depletion kinetics.
Can the Oxidograph operate at sub-ambient temperatures?
No—it is designed for isothermal or ramped heating only (30–199 °C); cryogenic or refrigerated operation is outside its engineering specification.
Is calibration traceable to NIST standards?
Pressure transducers are factory-calibrated against dead-weight testers; users perform periodic verification using certified reference gases and digital manometers per internal QA protocol.
Are replacement glass vessels available separately?
Yes—standardized Pyrex-type reaction tubes (Part No. OX-GV-6) and sealing caps are stocked globally through authorized distributors.
Does the system support automated sample loading?
No—manual placement is required; however, the compact footprint (363 × 500 × 500 mm) allows integration into robotic lab automation platforms via third-party gripper interfaces.
