Zhiyunda ZYD-NB Portable Pesticide Residue Rapid Tester
| Brand | Zhiyunda |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Manufacture | China |
| Model | ZYD-NB |
| Detection Method | Rapid Test Strip (Paper Disk) Method |
| Measurement Range | 0–100% inhibition |
| Number of Detection Channels | 10 |
| Measurement Error | <10% |
| Limit of Detection (LOD) | 0.03 mg/kg (for common organophosphates and carbamates) |
Overview
The Zhiyunda ZYD-NB Portable Pesticide Residue Rapid Tester is an engineered field-deployable instrument designed for qualitative and semi-quantitative screening of organophosphate and carbamate pesticide residues in agricultural commodities. It operates on the internationally recognized acetylcholinesterase (AChE) inhibition principle—standardized in GB/T 5009.199–2003 (China), AOAC Official Method 992.11, and aligned with ISO/IEC 17025–compliant rapid screening workflows. The system utilizes paired test strips: a white enzyme-coated disk (containing purified AChE) and a red substrate disk (indoxyl acetate). In the absence of inhibitors, AChE hydrolyzes indoxyl acetate to yield blue indoxyl—a visible chromogenic reaction. When organophosphate or carbamate pesticides are present, they reversibly inhibit AChE activity, suppressing color development proportionally to residue concentration. This biochemical endpoint enables rapid, reagent-based assessment without chromatographic separation or laboratory infrastructure.
Key Features
- 10 independent optical detection channels with synchronized incubation control—enabling parallel analysis of up to 10 samples per run.
- Microprocessor-controlled temperature regulation (37 ± 0.5 °C) and precise timing (1–15 min adjustable intervals), compliant with standard assay protocols for cholinesterase inhibition assays.
- Integrated rechargeable lithium-ion battery (≥8 h continuous operation), certified to UN 38.3 transport safety standards—optimized for off-grid use in farms, markets, and mobile inspection units.
- High-contrast LCD display with numeric readout and status icons; audible alerts confirm incubation completion and result acquisition.
- Pre-calibrated optical sensor array with dual-wavelength reflectance measurement (610 nm and reference 720 nm) to minimize ambient light interference and enhance colorimetric reproducibility.
- Rugged anodized aluminum carrying case (IP54-rated enclosure) includes all consumables: 100 test strip sets, calibration standards, pipettes, sample extraction kits, and QC documentation.
Sample Compatibility & Compliance
The ZYD-NB supports homogenized extracts from fresh produce (leafy greens, tomatoes, apples, citrus), tea leaves, cereal grains, surface water, and soil leachates—following standardized sample preparation per GB 2763–2021 Annex A. It meets national regulatory requirements for rapid screening in China’s Agricultural Product Quality and Safety Supervision System. While not intended for definitive quantification, its performance aligns with FAO/WHO JMPR guidance for tiered testing strategies: positive results trigger confirmatory GC-MS or LC-MS/MS analysis per ISO 17025-accredited laboratories. Device firmware and operational logs support GLP-compliant recordkeeping, including user ID, timestamp, channel ID, and raw reflectance values—facilitating internal audit trails.
Software & Data Management
The instrument operates standalone but integrates with Zhiyunda’s optional ZYD-Link desktop software (Windows 10/11 compatible) via USB-C interface. Software functions include automated inhibition rate calculation (%I = [1 − (Sample OD / Blank OD)] × 100), threshold-based pass/fail classification (default cutoff: ≥50% inhibition), batch report generation (PDF/CSV), and export of audit-ready files containing operator metadata, environmental conditions (ambient temp/humidity), and calibration history. All data storage complies with local data sovereignty requirements; no cloud upload occurs unless explicitly enabled by end-user configuration.
Applications
- Pre-harvest field screening at orchards, greenhouses, and open-field vegetable farms to guide harvest timing and reduce post-harvest rejection risk.
- Routine surveillance at wholesale markets, farmers’ cooperatives, and cold-chain distribution hubs—supporting HACCP prerequisite programs.
- On-site verification for food service providers (catering facilities, school cafeterias, hotel kitchens) prior to ingredient processing.
- Capacity-building deployments in rural extension services and third-party certification bodies conducting GMP-aligned supplier audits.
- Educational use in university food science labs for teaching enzymatic inhibition kinetics and rapid assay validation principles.
FAQ
What pesticides does the ZYD-NB detect?
It detects acetylcholinesterase-inhibiting compounds—including chlorpyrifos, dimethoate, methamidophos, carbofuran, and aldicarb—with sensitivity validated against reference standards traceable to NIST SRM 3171a.
Is calibration required before each use?
A blank strip calibration is performed automatically at power-on; full recalibration using control strips is recommended every 24 hours or after environmental temperature shifts >5 °C.
Can results be exported for regulatory submission?
Yes—raw reflectance data, inhibition rates, and operator-signed reports meet documentation requirements for provincial-level agricultural bureau inspections under China’s AQSIQ Order No. 135.
What is the shelf life of test strips?
Unopened strips retain efficacy for 18 months when stored at 2–8 °C; opened vials must be used within 30 days under desiccated conditions.
Does the device comply with international export regulations?
The unit carries CE marking (EMC Directive 2014/30/EU, RoHS 2011/65/EU) and is listed in China’s Export Commodity Catalogue for Food Safety Instruments (Annex III, 2023 Edition).
