Zhiyunda ZYD-S1 Isothermal Fluorescent Molecular Detection System

Overview

The Zhiyunda ZYD-S1 Isothermal Fluorescent Molecular Detection System is an integrated benchtop platform engineered for rapid, sensitive, and contamination-controlled nucleic acid detection using isothermal amplification coupled with real-time fluorescence monitoring. Unlike conventional thermal cycling-based PCR systems, the ZYD-S1 operates at a precisely maintained constant temperature—eliminating the need for complex thermocycling hardware while preserving high specificity and reproducibility. The system leverages loop-mediated isothermal amplification (LAMP), recombinase polymerase amplification (RPA), or other validated isothermal chemistries compatible with dual-channel fluorescent probe detection (e.g., FAM and HEX). Its primary design objective is to support frontline molecular screening in food safety laboratories, veterinary diagnostic centers, and regulatory testing facilities where speed, operational simplicity, and biosafety are critical. The instrument incorporates a Peltier-based thermostatic module with closed-loop feedback control, ensuring ±0.5 °C thermal stability across the reaction chamber—essential for minimizing off-target amplification and maximizing assay robustness.

Key Features

• Precise isothermal incubation: Maintains uniform temperature across all sample wells with active thermal regulation and real-time monitoring.
• Real-time dual-channel fluorescence detection: Integrated optical path supports simultaneous excitation and emission capture at two distinct wavelengths, enabling multiplexed target identification without spectral overlap interference.
• Closed-tube workflow: Eliminates post-amplification handling—no gel electrophoresis, no tube opening—significantly reducing cross-contamination risk and supporting GLP-compliant operation.
• Intuitive 7-inch capacitive touchscreen interface: Graphical user interface guides users through four standardized steps—sample loading, protocol selection, run initiation, and result interpretation—with multilingual support (English, Spanish, Arabic, and simplified Chinese).
• Scalable throughput architecture: Accommodates 1–14 samples per run with flexible well assignment; supports up to five independent assays in parallel via programmable channel mapping.
• Onboard data management: Internal storage (8 GB flash + microSD expansion) retains raw fluorescence curves, threshold cycles (Ct), amplification efficiency metrics, and audit logs compliant with ISO/IEC 17025 record-keeping requirements.

Sample Compatibility & Compliance

The ZYD-S1 accepts standard 0.2 mL transparent PCR tubes or 8-well strips compatible with commercial isothermal master mixes. It has been validated for use with extracted nucleic acids from diverse matrices—including meat homogenates, feed pellets, environmental swabs, and serum—following AOAC-approved or CNAS-recognized extraction protocols (e.g., QIAGEN QIAamp DNA Mini Kit, Takara FastPure kits). The system adheres to electromagnetic compatibility (EMC) standards IEC 61326-1 and safety standard IEC 61010-1. While not certified under FDA 21 CFR Part 11, its software architecture supports optional configuration for electronic signature, audit trail, and role-based access control—facilitating alignment with GMP/GLP documentation practices during method validation and routine quality control.

Software & Data Management

The ZYD-S1 runs embedded firmware v3.2+ with local analysis engine capable of automatic baseline correction, dynamic threshold calculation, and qualitative call generation (positive/negative/invalid) based on user-defined confidence intervals. Raw fluorescence intensity vs. time datasets are exportable in CSV and .fdt formats. Optional desktop software (ZYD-Analyze Pro, Windows/macOS) provides advanced features including inter-run normalization, melting curve analysis (if enabled by probe chemistry), statistical batch reporting, and integration with LIMS via HL7 or RESTful API. All cloud-synchronized data are transmitted over TLS 1.2+ with end-to-end AES-256 encryption and stored in geographically redundant AWS S3 buckets compliant with ISO 27001.

Applications

• Foodborne pathogen surveillance: Detection of Salmonella, Listeria monocytogenes, E. coli O157:H7, and Campylobacter jejuni in raw and processed foods.
• Veterinary diagnostics: Rapid field-deployable screening for African Swine Fever Virus (ASFV), Classical Swine Fever Virus (CSFV), and Foot-and-Mouth Disease Virus (FMDV).
• Species authentication: Identification of adulterated meat products (e.g., horsemeat in beef, pork in halal-certified goods) using mitochondrial DNA markers.
• GMO traceability: Qualitative detection of common transgenic elements including CaMV 35S promoter, NOS terminator, and event-specific sequences (e.g., MON810, NK603).
• Environmental monitoring: Screening of water and surface swab samples for antimicrobial resistance genes (e.g., bla_CTX-M, vanA) in agricultural and processing facilities.

FAQ

Does the ZYD-S1 support quantitative analysis?
No—the system is optimized for qualitative and semi-quantitative endpoint calling. Absolute quantification requires external calibration curves and is not part of its standard operating mode.
Can third-party reagents be used with this instrument?
Yes, provided they are compatible with isothermal amplification and emit detectable fluorescence within the FAM/HEX spectral windows. Validation per ISO 13528 is recommended prior to routine use.
Is remote firmware update supported?
Yes—updates may be delivered via secure OTA (over-the-air) mechanism or offline USB installation, with SHA-256 signature verification.
What maintenance is required?
Annual optical path calibration and thermal block verification are advised. No consumable parts require scheduled replacement beyond standard lab-grade pipette tips and reaction tubes.
How is data integrity ensured during cloud transmission?
All uploads undergo HMAC-SHA256 message authentication before encryption; timestamps and device serial numbers are cryptographically bound to each dataset.