BioTek® ELx808IU Microplate Reader for Bacterial Endotoxin Testing

Overview

The BioTek® ELx808IU Microplate Reader is a dedicated, FDA- and USP General Chapter <85>-compliant instrument engineered for quantitative bacterial endotoxin testing (BET) using the Limulus Amebocyte Lysate (LAL) assay. It operates on dual optical detection principles—absorbance photometry (for chromogenic LAL assays) and turbidimetric measurement (for kinetic-turbidimetric LAL assays)—enabling precise, reproducible quantification of endotoxin concentrations across pharmaceutical, biotechnology, and medical device manufacturing environments. Designed specifically for regulatory-grade BET workflows, the ELx808IU integrates four independently controlled temperature modules (37 °C ± 0.5 °C), each monitored in real time by an internal system controller to ensure thermal stability critical for enzyme kinetics in LAL reactions. Its eight-channel optical path architecture minimizes inter-well variability and supports high-throughput 96-well microplate analysis with wavelength-specific precision at 340, 405, 450, 490, and 620 nm—standard filter positions validated for endotoxin assay compatibility per USP <85> and EP 2.6.14.

Key Features

• Dual-mode optical detection: Absorbance (chromogenic) and turbidimetric (kinetic) read capabilities optimized for LAL-based endotoxin quantification
• Four independent, programmable temperature modules (37 °C nominal) with continuous internal monitoring and closed-loop thermal regulation
• Eight-channel parallel detection system with fixed-wavelength filters (340, 405, 450, 490, 620 nm) pre-aligned and factory-verified for BET assay performance
• Integrated hardware-level calibration traceability compliant with ISO/IEC 17025 requirements for clinical and GMP laboratories
• Robust mechanical architecture with vibration-dampened optics platform and sealed optical path to minimize drift during extended kinetic runs
• Pre-configured firmware supporting standard BET protocols including single-point calibration, multi-point standard curves, and endpoint/turbidimetric kinetic analysis modes

Sample Compatibility & Compliance

The ELx808IU is validated for use with all major LAL reagent formats—including chromogenic, turbidimetric, and gel-clot kits—supplied by Charles River Laboratories and other USP-compliant vendors. It meets the instrumental performance criteria defined in USP <85>, EP 2.6.14, and JP 4.03, and supports full audit trail generation required under FDA 21 CFR Part 11 when operated with qualified software such as Endoscan-V™. The system is routinely qualified per IQ/OQ/PQ protocols aligned with ASTM E2500-13 and ICH Q5C guidelines for analytical instrument qualification in regulated environments. All temperature modules undergo annual on-site qualification to verify thermal uniformity (±0.3 °C across plate surface) and stability (±0.2 °C over 60-minute hold), ensuring conformance with preventive maintenance schedules recommended by Charles River.

Software & Data Management

The ELx808IU operates natively with Endoscan-V™ software—a 21 CFR Part 11-compliant application validated for BET data acquisition, curve fitting (four-parameter logistic regression), limit test calculation, and electronic signature capture. Raw absorbance and turbidity data are stored in secure, encrypted database files with immutable timestamps and user-access logs. Audit trails include operator ID, parameter changes, calibration events, and result approvals—fully exportable in CSV or PDF-A format for regulatory submission. Software qualification packages (TS550) include documented evidence of installation, operational, and performance verification, while annual requalification services (TS500) maintain ongoing compliance with GLP/GMP data integrity standards.

Applications

• Quantitative endotoxin testing of parenteral drug products, active pharmaceutical ingredients (APIs), and excipients per USP <85>
• Final container testing of sterile medical devices and implantables prior to release
• In-process monitoring of water-for-injection (WFI) and purified water systems
• Stability-indicating BET assays during accelerated and long-term storage studies
• Validation support for LAL reagent lot release and method transfer between QC laboratories
• Supporting microbial limits testing and sterility assay ancillary controls where endotoxin interference must be ruled out

FAQ

Is the ELx808IU compatible with Endoscan-V™ software?
Yes—the instrument is factory-configured and fully validated for seamless integration with Endoscan-V™, including automated protocol loading, kinetic data streaming, and regulatory report generation.
Does the system support 21 CFR Part 11 compliance?
When deployed with qualified Endoscan-V™ software and associated access controls, electronic signatures, and audit trail configuration, the ELx808IU meets all technical and procedural requirements of 21 CFR Part 11.
What temperature accuracy is maintained during kinetic turbidimetric assays?
Each of the four temperature modules maintains 37 °C ± 0.5 °C across the entire 96-well plate surface, verified via NIST-traceable thermocouple mapping during annual PQ qualification.
Can the ELx808IU be used for non-endotoxin applications?
While optimized for BET, the instrument may perform general absorbance measurements at its installed wavelengths; however, it is not validated or supported for non-BET applications under GMP or regulatory review contexts.
How often is preventive maintenance recommended?
Charles River recommends quarterly functional checks and annual on-site IQ/OQ/PQ qualification (TS500), including optical path verification, temperature module validation, and filter alignment certification.