Youyunpu YP-SJ12 Automated Melamine Analyzer for Dairy Products
| Brand | Youyunpu |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | YP-SJ12 |
| Price | USD 850 (FOB Shandong) |
| Detection Target | Melamine in Milk and Dairy-Based Matrices |
| Automation Level | Fully Automated |
| Application Scope | Raw Material Screening, In-Process Control, and Finished Product Release Testing |
Overview
The Youyunpu YP-SJ12 Automated Melamine Analyzer is a dedicated immunoassay-based quantitative detection system engineered for routine, high-throughput melamine analysis in liquid and reconstituted dairy matrices. It operates on the principle of competitive enzyme-linked immunosorbent assay (ELISA), where melamine in the sample competes with melamine-conjugated enzyme for binding sites on anti-melamine antibodies immobilized on microplate wells. Following enzymatic substrate reaction and color development, optical density is measured at 450 nm using an integrated photometric reader. The instrument automates pipetting, incubation, washing, substrate addition, and signal acquisition—eliminating manual variability and ensuring traceable, reproducible results compliant with AOAC Official Method 2008.05 and GB/T 22388–2008 for melamine in dairy products.
Key Features
- Fully automated workflow: Integrated robotic liquid handling, temperature-controlled incubation (37 ± 0.5 °C), 12-channel precision washing, and dual-wavelength photometry (450/630 nm) minimize operator intervention and inter-assay drift.
- Dairy-optimized extraction protocol: Pre-programmed sample preparation routines accommodate raw milk, UHT milk, powdered infant formula, yogurt, fermented dairy blends, and feed extracts—requiring only minimal pre-dilution or centrifugation per matrix-specific SOPs.
- Regulatory-ready data architecture: Built-in audit trail logs all user actions, method parameters, calibration events, and result modifications with timestamps and operator IDs—supporting GLP and GMP documentation requirements.
- Calibration traceability: Includes NIST-traceable melamine reference standards (0.05–5.0 mg/kg range) and onboard calibration verification checks before each batch run.
- Robust hardware design: Sealed optical path, anti-condensation incubator chamber, and corrosion-resistant fluidics ensure stable performance in ambient laboratory environments (15–30 °C, 30–80% RH).
Sample Compatibility & Compliance
The YP-SJ12 is validated for use with homogenized liquid milk (whole, skim, fortified), reconstituted powdered milk (including infant formula), fermented dairy products (yogurt, kefir, acidified milk), and cereal- or soy-based dairy alternatives containing ≤2% fat. Feed samples—including calf starter, dairy concentrate pellets, and silage extracts—are supported via optional solid-phase extraction (SPE) module integration. All analytical procedures align with Chinese National Standard GB/T 22388–2008, ISO/IEC 17025:2017 method validation criteria, and FDA Guidance for Industry: Melamine and Analogues in Food and Feed (2008). Instrument software supports 21 CFR Part 11-compliant electronic signatures when deployed with networked authentication servers.
Software & Data Management
The embedded Windows-based control software (v3.2.1) provides intuitive method setup, real-time run monitoring, automatic curve fitting (4-parameter logistic regression), and QC flagging per Westgard rules. Data export formats include CSV, PDF reports (with embedded chromatogram-style absorbance plots), and XML for LIMS integration. All raw OD values, standard curves, and sample replicates are stored locally with SHA-256 hash integrity verification. Remote diagnostics and firmware updates are available via encrypted HTTPS channel; no cloud storage or third-party telemetry is enabled by default.
Applications
- Raw material acceptance testing at dairy intake bays to verify supplier compliance with <1.0 mg/kg melamine limits per EU Commission Regulation (EC) No 1881/2006.
- In-line quality assurance during powder blending and spray drying—enabling rapid release decisions without waiting for off-site LC-MS/MS confirmation.
- Regulatory surveillance by provincial food and drug administration laboratories conducting routine market monitoring under China’s Food Safety Risk Monitoring Program.
- Feed mill QA/QC for protein adulteration screening prior to delivery to livestock farms—reducing risk of carryover into milk supply chains.
- Academic research on melamine migration kinetics in dairy processing equipment surfaces and packaging materials.
FAQ
What sample volume is required per test?
100 µL of clarified liquid sample or 100 µL of supernatant from centrifuged extract.
Does the system require external refrigeration for reagent storage?
No—the onboard reagent cooler maintains ELISA kits and conjugates at 2–8 °C during operation; ambient storage is permitted for unopened kits.
Can the YP-SJ12 quantify melamine analogues such as ammeline or melam?
No—it is specifically calibrated for melamine only; cross-reactivity with structural analogues is <2% and not quantified.
Is method transfer support available for laboratory accreditation?
Yes—Youyunpu provides IQ/OQ documentation templates, validation protocols aligned with ISO 17025, and on-site technical assistance for CNAS or ILAC recognition pathways.
What maintenance intervals are recommended?
Daily tip deck cleaning, weekly fluidic line flush with 10% ethanol, and quarterly photometer wavelength verification using certified neutral density filters.
