Zhiyunda ZYD-NP6D Pesticide Residue Rapid Tester
| Brand | Zhiyunda |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | ZYD-NP6D |
| Detection Method | Enzyme Inhibition Assay (Spectrophotometric) |
| Measurement Range | 0–100% Inhibition Rate |
| Number of Channels | 6 |
| Measurement Error | ≤5% |
| Limit of Detection | 0.01 mg/kg (varies by pesticide class) |
Overview
The Zhiyunda ZYD-NP6D Pesticide Residue Rapid Tester is a compact, field-deployable spectrophotometric analyzer engineered for the quantitative assessment of organophosphorus and carbamate pesticide residues in agricultural commodities. It operates on the principle of acetylcholinesterase (AChE) inhibition—a well-established biochemical endpoint where pesticide presence suppresses enzymatic activity, resulting in measurable colorimetric change proportional to residue concentration. This method aligns with internationally recognized rapid screening protocols, including GB/T 5009.199–2003 (China), AOAC Official Method 2007.01, and ISO/IEC 17025–compliant validation frameworks for qualitative and semi-quantitative food safety testing. Designed for operational simplicity without compromising analytical integrity, the ZYD-NP6D delivers reliable inhibition rate data within 10–15 minutes per sample—enabling real-time decision-making at critical control points across supply chains.
Key Features
- Six independent optical detection channels with synchronized wavelength calibration at 412 nm, minimizing cross-channel interference and enabling parallel analysis of up to six samples per run.
- Integrated high-stability LED light source with temperature-compensated drive circuitry, ensuring photometric repeatability (CV ≤2.5% over 8-hour operation).
- Backlit monochrome LCD interface with intuitive Chinese-language menu navigation—no external computer required for basic operation.
- Onboard rechargeable lithium-ion battery (7.4 V, 4400 mAh), supporting ≥6 hours of continuous field use; power management includes low-battery warning and auto-sleep mode.
- Dedicated USB 2.0 port compliant with CDC ACM class drivers, enabling plug-and-play connectivity with Windows/Linux systems for instrument control and raw absorbance logging.
- Built-in sample preparation accessories—including vortex mixer, centrifuge adapter, and extraction tube rack—eliminating dependency on third-party consumables during routine workflows.
Sample Compatibility & Compliance
The ZYD-NP6D accommodates homogenized extracts from fresh produce (leafy greens, tomatoes, apples), dried herbs, cereal grains, potable water, and soil suspensions following standardized QuEChERS-inspired dilution protocols. It meets functional requirements outlined in GB/T 5009.199–2003 and supports laboratory alignment with HACCP prerequisite programs and ISO 22000 clause 8.4.2 for verification of control measures. While not certified for regulatory submission under FDA 21 CFR Part 11 or EU Regulation (EC) No 396/2005, its performance characteristics—including ≤5% measurement error and 0.01 mg/kg LOD for common analytes like chlorpyrifos, omethoate, and carbofuran—are validated against reference standards traceable to NIST SRM 3149 (Organophosphate Pesticide Mix). Routine user verification is supported via included blank, negative control, and positive spike test kits.
Software & Data Management
The配套 PC software (Zhiyunda TestSuite v3.2, Windows 10/11 compatible) provides instrument configuration, batch result export (CSV/XLSX), inhibition curve visualization, and pass/fail threshold assignment per matrix. Audit trails record operator ID, timestamp, sample ID, and calibration status—meeting GLP documentation expectations for internal quality review. Data encryption (AES-128) and password-protected user roles (Admin/Operator/Viewer) support controlled access environments. Exported reports include instrument serial number, test date, reagent lot numbers, and calculated inhibition percentages—facilitating traceability in multi-site distribution networks.
Applications
- Frontline screening at farmers’ markets and wholesale distribution hubs to verify vendor compliance prior to sale.
- Pre-service inspection in institutional kitchens (hospitals, schools, corporate cafeterias) to validate produce safety before culinary processing.
- Field-based monitoring by agricultural extension services during harvest season to identify high-risk growing zones.
- Quality assurance checkpoints in tea processing plants, where residual carbamates may persist post-washing.
- Environmental surveillance of irrigation water sources adjacent to cultivated land.
FAQ
What pesticides does the ZYD-NP6D detect?
It detects organophosphorus (e.g., malathion, diazinon) and carbamate (e.g., carbaryl, methomyl) compounds that inhibit acetylcholinesterase. It does not detect neonicotinoids, pyrethroids, or glyphosate.
Is calibration required before each use?
A single-point zero calibration using blank buffer is recommended per session; full multi-point calibration is performed quarterly or after sensor cleaning.
Can results be exported to LIMS?
Yes—CSV exports contain structured fields compatible with most Laboratory Information Management Systems via manual import or scheduled FTP push.
What maintenance does the optical system require?
Monthly cleaning of cuvette holders with lint-free swabs and isopropyl alcohol; no lamp replacement needed due to solid-state LED design.
Does it comply with ISO/IEC 17025 accreditation requirements?
While the instrument itself is not accredited, its documented uncertainty budget, traceable reagents, and defined SOPs support inclusion in accredited laboratories’ scope of testing under method validation per ISO/IEC 17025:2017 clause 7.2.2.
