Hongweiliangzi HW-QN40 40-Channel Fully Automated Pesticide Residue Analyzer

Overview

The Hongweiliangzi HW-QN40 is a fully automated, 40-channel pesticide residue analyzer engineered for routine quantitative screening of organophosphorus and carbamate pesticides in fresh produce—including fruits, vegetables, and leafy greens. It operates on the well-established enzyme inhibition principle, leveraging the biochemical interaction between acetylcholinesterase (AChE) and target pesticides. In the presence of inhibitory residues, AChE activity decreases proportionally to concentration, resulting in reduced hydrolysis of substrate (e.g., acetylthiocholine iodide) and a measurable increase in optical absorbance at 410 nm via photometric colorimetry. This method is widely recognized under national and international food safety standards—including GB/T 5009.199–2003 (China), AOAC Official Method 992.13, and ISO/IEC 17025–compliant validation frameworks—for rapid, cost-effective field and laboratory deployment.

Key Features

• 40 parallel detection channels with independent reaction wells—each fabricated from chemically inert, optically transparent material to ensure consistent photometric performance and minimal carryover.
• Integrated 37 ± 0.1 °C thermostatic incubation system across all reaction positions, maintaining precise enzymatic reaction kinetics throughout assay cycles.
• Automated liquid handling with dual-sensor reagent and sample needles: liquid-level detection prevents air aspiration; mechanical collision protection safeguards against tip damage during high-throughput operation.
• Self-cleaning cycle for reusable cuvettes (500 µL capacity), including aspiration, rinse, and dry steps—eliminating manual washing and reducing consumable dependency.
• 7-inch capacitive touchscreen interface with intuitive workflow navigation, supporting multi-language UI configuration (English default) and context-sensitive help prompts.
• Built-in thermal printer with customizable report formats (e.g., sample ID, timestamp, inhibition rate %, pass/fail flag per channel) compliant with GLP documentation requirements.

Sample Compatibility & Compliance

The HW-QN40 accommodates homogenized aqueous extracts prepared from common agricultural commodities using standardized extraction protocols (e.g., QuEChERS-based or acetone/water dilution). It supports open reagent architecture—compatible with third-party AChE kits and chromogenic substrates meeting ISO 15190:2022 specifications for diagnostic enzyme reagents. All assay parameters—including incubation time, reagent volumes, and calibration intervals—are configurable to align with local regulatory thresholds (e.g., MRLs per EU Regulation (EC) No 396/2005 or China’s GB 2763–2021). Data integrity is maintained through audit-trail-enabled software logging (user actions, timestamps, result modifications), satisfying basic FDA 21 CFR Part 11 readiness for non-GxP environments.

Software & Data Management

The instrument runs an embedded Linux-based workstation with standalone operation capability—no external PC required for daily testing. Software modules include batch sample registration, auto-blank calibration, inhibition rate calculation (using ΔA/min reference), and real-time QC flagging. Results are exportable in CSV or PDF format via USB or Ethernet. Network integration enables secure HTTP/HTTPS upload to centralized food safety surveillance platforms—fully compatible with provincial-level Chinese food traceability systems (e.g., “Food Safety Cloud”) and configurable for RESTful API connectivity to global LIMS or ERP infrastructure. Remote firmware updates and diagnostic telemetry support proactive maintenance planning.

Applications

• Routine surveillance in municipal food safety inspection centers and county-level CDC laboratories.
• On-site screening at wholesale markets, farm cooperatives, and supermarket QA labs—reducing turnaround time from hours to minutes per batch.
• Pre-harvest monitoring programs for integrated pest management (IPM) compliance verification.
• Contract testing laboratories performing accredited pesticide residue screening under CNAS-CL01 (ISO/IEC 17025) scope.
• Educational use in food science curricula for teaching fundamental principles of enzymatic biosensing and food toxicology.

FAQ

What types of pesticides does the HW-QN40 detect?
It quantitatively detects organophosphorus and carbamate pesticides based on their reversible inhibition of acetylcholinesterase—covering >95% of commonly used agricultural compounds in this class, including chlorpyrifos, dimethoate, carbaryl, and methomyl.
Can the instrument be validated for regulatory reporting?
Yes—method validation per ISO/IEC 17025 Annex B or AOAC guidelines is supported through documented SOPs, calibration records, and inter-laboratory comparison data available upon request.
Is reagent lot traceability supported?
Each test run logs reagent lot number, expiration date, and operator ID automatically—enabling full chain-of-custody tracking required for audit readiness.
How is cross-contamination prevented between samples?
Dual-stage needle washing, positive-pressure air drying, and disposable tip options (via optional adapter) ensure <0.01% carryover—verified per CLSI EP26-A protocol.
Does the system support remote diagnostics?
Yes—embedded SSH access and diagnostic log export allow certified service engineers to perform root-cause analysis without onsite visits.