Gerhardt HT6+SOX416 Automated Total Fat Determination System

Overview

The Gerhardt HT6+SOX416 Automated Total Fat Determination System is a fully integrated, dual-module analytical platform engineered for precise and compliant total fat quantification in food, feed, agricultural, and environmental laboratories. It combines the Gerhardt HYDROTHERM hydrolysis module with the SOXTHERM automated solvent extraction system—two independently validated instruments unified under a single operational architecture. This configuration implements the complete AOAC 991.36, ISO 1443, and USDA-approved total fat methodology: acid hydrolysis followed by continuous or semi-continuous solvent extraction using petroleum ether or diethyl ether. The system operates on the principle of exhaustive lipid liberation via controlled thermal-acidic hydrolysis, followed by quantitative solvent-based extraction under precisely regulated temperature and reflux conditions. Its modular design ensures full traceability across both hydrolysis and extraction phases, supporting audit-ready workflows required under GLP, GMP, and ISO/IEC 17025 environments.

Key Features

• Six-channel parallel extraction capability (HT6 module) enables high-throughput batch processing of up to six samples simultaneously without cross-contamination.
• Independent temperature control for hydrolysis (HYDROTHERM) and extraction (SOX416) modules, each maintaining ±0.1 °C stability across the full 20–300 °C operating range.
• 150 mL extraction chamber volume and 200 mL receiver flask capacity optimized for AOAC-compliant sample sizes (2–5 g) and complete solvent recovery.
• Automated sequence programming via SOXTHERMDE software or optional MULTISTAT external controller—supporting method storage, parameter locking, and user-level access control.
• Integrated safety systems including solvent vapor detection, overtemperature cutoff, automatic solvent level monitoring, and fail-safe reflux termination.
• Corrosion-resistant construction using borosilicate glass, PTFE-lined components, and stainless-steel heating blocks ensuring long-term reliability with aggressive reagents (e.g., HCl, sulfuric acid, ether).

Sample Compatibility & Compliance

The HT6+SOX416 accommodates solid, semi-solid, and composite matrices including dairy products, meat and fish tissue, cereal grains, oilseeds, pet food, soil, and botanical materials. Sample preparation follows standardized homogenization and drying protocols prior to hydrolysis. All operational parameters—including hydrolysis time (30–120 min), extraction duration (60–360 min), solvent type, and temperature ramp profiles—are programmable and electronically logged. The system conforms to multiple international standards: AOAC Official Method 991.36 (Total Fat in Foods), ISO 1443:2022 (Animal and Vegetable Fats and Oils — Determination of Crude Fat), ISO 6496 (Feedstuffs — Determination of Ether Extract), and USP <467> residual solvent guidance where applicable. Full electronic records meet FDA 21 CFR Part 11 requirements when deployed with validated SOXTHERMDE software and audit trail configuration.

Software & Data Management

SOXTHERMDE is a Windows-based instrument control and data management application developed exclusively for Gerhardt extraction platforms. It provides real-time monitoring of temperature, reflux rate, extraction progress, and system status across all six channels. Each run generates a timestamped, digitally signed report containing method ID, operator ID, calibration history, raw weight data (pre-/post-extraction), solvent usage, and calculated fat content (% w/w). Data export supports CSV, PDF, and LIMS-compatible XML formats. Role-based user accounts support three-tier permission levels (Operator, Supervisor, Administrator), with password-protected method editing and electronic signature enforcement for critical steps. Audit trails record all parameter changes, logins, report generations, and system events—retained for ≥18 months per internal validation policy.

Applications

• Regulatory testing labs performing routine fat analysis for nutritional labeling compliance (EU Regulation No. 1169/2011, FDA 21 CFR 101.9).
• Quality control departments in dairy processors verifying butterfat content in milk powder, cheese, and yogurt formulations.
• Animal nutrition research facilities assessing crude fat digestibility in feed trials using proximate analysis workflows.
• Contract testing organizations conducting multi-client analyses under ISO/IEC 17025 accreditation with documented uncertainty budgets.
• Government food safety agencies executing surveillance programs for adulteration detection (e.g., vegetable oil dilution in olive oil).

FAQ

What hydrolysis reagents are compatible with the HYDROTHERM module?

Concentrated hydrochloric acid (HCl, 3–4 M) and sulfuric acid (H₂SO₄, 1–2 M) are routinely used; all wetted parts resist corrosion at elevated temperatures.
Can the system perform cold extraction without hydrolysis?

Yes—the SOX416 extraction module operates independently and supports direct solvent extraction per AOAC 920.39 (crude fat) or ISO 659 (oilseeds).
Is method validation support available from Gerhardt?

Gerhardt provides IQ/OQ documentation templates, performance qualification protocols, and on-site installation qualification services upon request.
How is solvent recovery handled during operation?

Each channel features a dedicated condenser-cooled reflux path with automatic solvent return to the extraction chamber; no manual intervention is required.
What maintenance intervals are recommended for routine operation?

Daily visual inspection of seals and glassware; quarterly verification of temperature sensors and annual calibration of balance interface and pressure sensors.