KH-ZY10E Post-Column Derivatization System by Kezhe Shanghai

Overview

The KH-ZY10E Post-Column Derivatization System is an engineered solution designed for high-sensitivity, reproducible fluorescence-based detection in reversed-phase and ion-pair HPLC workflows. It operates on the principle of controlled chemical derivatization downstream of the chromatographic column—enabling conversion of non-fluorescent or weakly fluorescent analytes into stable, highly emissive derivatives immediately prior to detection. This system is specifically validated for pharmacopoeial applications, including Chinese Pharmacopoeia (ChP) Method 2351 for aflatoxin B₁, B₂, G₁, and G₂ quantification, where post-column iodination generates fluorescent isoform derivatives detectable at excitation/emission wavelengths of 365/425 nm. Its thermally regulated reaction environment ensures kinetic consistency across injections, while its sealed, low-dead-volume flow path minimizes band broadening and preserves chromatographic resolution—critical for trace-level analysis in complex matrices such as edible oils, grains, and herbal extracts.

Key Features

• Modular reactor architecture with tool-free cartridge replacement—only two quick-connect fittings required per installation or maintenance cycle.
• Patented low-dispersion reaction core geometry, reducing axial dispersion by >40% compared to conventional coiled reactors (based on CFD simulation benchmarks).
• Sealed continuous-loop reaction coil (10 m PTFE-lined stainless steel) with multi-directional flow induction—ensuring turbulent mixing without external agitation or pulsation.
• Dual-zone thermal control: supports simultaneous heating (up to 150 °C) and cooling reactions within a single platform via optional dual-cartridge configuration.
• Integrated precision derivatization pump with flow range 0–10 mL/min, repeatability ±0.1%, and compatibility with aggressive reagents (e.g., iodine in methanol/water, o-phthalaldehyde, ninhydrin).
• Real-time temperature monitoring with PID-controlled heating block, accuracy ±0.25 °C and resolution ±0.1 °C—meeting GLP temperature validation requirements.

Sample Compatibility & Compliance

The KH-ZY10E is compatible with standard HPLC systems operating at pressures up to 400 bar and flow rates from 0.2 to 5.0 mL/min. It supports derivatization chemistries essential for regulated testing: iodine-mediated oxidation of aflatoxins (ChP, USP ), o-phthalaldehyde (OPA) or naphthalene-2,3-dicarboxaldehyde (NDA) labeling of primary amines (e.g., amino acids, taurine), and dansylation of hydrazides (e.g., carbamate pesticides). The system’s hardware design conforms to ISO 9001 manufacturing standards; its thermal and flow performance is documented per ASTM E260-18 (Standard Practice for Calibration of Liquid Chromatography Systems). When integrated with FDA 21 CFR Part 11-compliant data acquisition software, full audit trails—including temperature logs, pump calibration records, and derivatization reagent batch metadata—can be maintained for regulatory submissions.

Software & Data Management

While the KH-ZY10E operates as a standalone hardware module, it is fully interoperable with industry-standard chromatography data systems (CDS) such as Thermo Chromeleon, Waters Empower, and Agilent OpenLab CDS. All critical operational parameters—including setpoint temperature, actual block temperature, derivatization pump flow rate, and runtime status—are accessible via analog 0–5 V or RS-232 interface for synchronized logging. Optional firmware upgrade enables Modbus RTU communication for integration into centralized laboratory automation platforms. All temperature and flow events are timestamped and exportable in CSV format, supporting ALCOA+ data integrity principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available).

Applications

• Aflatoxin quantification in food and feed matrices per ChP, EU Commission Regulation (EC) No 401/2006, and AOAC Official Method 2005.08.
• Taurine analysis in energy drinks and infant formula using OPA post-column derivatization.
• Carbamate pesticide residue screening (e.g., carbaryl, methomyl) in fruits and vegetables via hydrazide coupling and fluorescence detection.
• Free amino acid profiling in biological fluids (plasma, urine) and fermentation broths under USP chromatographic conditions.
• Glycerophospholipid metabolite analysis requiring phospholipase-catalyzed cleavage followed by amine-specific derivatization.

FAQ

Is the KH-ZY10E compatible with UHPLC systems?

Yes—when used with low-volume reaction coils (optional 2 m or 5 m variants) and matched to sub-2 µm particle columns, it maintains peak capacity with minimal extra-column variance.
Can the system perform two sequential derivatization steps?

Yes—via dual-cartridge configuration, enabling independent temperature and flow control for stepwise reactions (e.g., hydrolysis followed by amine labeling).
What reagent compatibility documentation is provided?

Kezhe supplies material compatibility charts covering PTFE, PEEK, and 316 stainless steel contact surfaces for common derivatization reagents, including iodine/methanol, OPA/borate buffer, and ninhydrin/acetic acid.
Does the system support IQ/OQ/PQ validation protocols?

Yes—factory-provided validation templates align with ASTM E260-18 and EU GMP Annex 15; installation qualification includes leak testing, temperature mapping, and flow calibration certificates.
Is remote monitoring supported?

Via optional Ethernet-to-RS232 gateway, real-time status and alarms can be integrated into LabVantage or STARLIMS LIMS environments.