JiDa-Xiaotian’e GDYN-200S Protein Rapid Determinator
| Brand | JiDa-Xiaotian'e |
|---|---|
| Origin | Jilin, China |
| Manufacturer Type | Manufacturer |
| Region Category | Domestic (China) |
| Model | GDYN-200S |
| Product Type | True Protein Analyzer |
| Measurement Principle | Colorimetric Protein Assay (Biuret-based) |
| Measurement Range | 0.5–4.0% (liquid milk) |
| Detection Limit | 0.5% (liquid milk) |
| Precision | ±3% RSD |
| Light Source | Silicon Photodiode |
| Operating Temperature | 15–35 °C |
| Power Supply | 220 V AC, 50 Hz |
| Interface | RS-232 / USB |
| Data Output | Integrated thermal printer + digital export |
Overview
The JiDa-Xiaotian’e GDYN-200S Protein Rapid Determinator is a dedicated benchtop analyzer engineered for the accurate, interference-resistant quantification of true protein content in liquid and powdered food matrices. It operates on a validated colorimetric assay principle—specifically a modified biuret reaction—where peptide bonds in native proteins react with copper(II) ions under alkaline conditions to form a stable violet-colored complex, measurable at 540 nm. Unlike Kjeldahl-based nitrogen estimation, this method directly targets protein-bound nitrogen while excluding non-protein nitrogen (NPN) compounds such as melamine, urea, ammonium nitrate, and glycine—critical for regulatory compliance in dairy and infant formula testing. Designed for routine use in quality control laboratories, the GDYN-200S delivers results in 5–10 minutes per sample without acid digestion, high-temperature heating, or hazardous reagent handling, thereby eliminating occupational safety risks and reducing analytical turnaround time by >90% compared to classical wet chemistry methods.
Key Features
- True protein-specific detection via selective biuret-colorimetry—immune to common NPN adulterants including melamine and urea
- Integrated flow-through sample introduction system—eliminates manual cuvette loading, minimizes cross-contamination, and simplifies cleaning and maintenance
- Dual-mode data output: real-time thermal printing (built-in) + digital export via RS-232 or USB interface
- Onboard microprocessor with embedded firmware supporting measurement, parameter configuration, data logging (up to 500 records), statistical analysis (mean, SD, CV%), and calibration management
- Optimized optical path using silicon photodiode light source and precision-filtered detection at 540 nm for high photometric stability and repeatability
- Robust architecture designed for ambient laboratory environments (15–35 °C); no external cooling or ventilation required
Sample Compatibility & Compliance
The GDYN-200S is validated for direct analysis of diverse food-grade samples without derivatization or pre-dilution: raw and flavored liquid milks (including walnut-, oat-, and jujube-infused variants), bovine colostrum (liquid and lyophilized), infant formula powders, soy-based nutritional powders, and egg solids. Its specificity for peptide-bond-derived chromophore formation ensures conformance with AOAC Official Method 984.13 (modified biuret) and supports alignment with ISO 8968-1 (milk protein determination) and GB 5009.5–2016 (Chinese national standard for food protein analysis). While not FDA 21 CFR Part 11–compliant out-of-the-box, audit trails and electronic records generated via optional PC software meet GLP documentation requirements for internal QC and third-party inspection readiness.
Software & Data Management
The instrument supports bidirectional communication with Windows-based desktop software via RS-232 or USB. The application enables remote instrument control, batch data import/export (CSV/Excel), calibration curve generation (linear/logarithmic), outlier flagging, and automated report generation compliant with ISO/IEC 17025 documentation templates. All measurements are timestamped and user-ID tagged; raw absorbance values, calculated protein concentrations, and operator-defined sample IDs are stored locally and synchronized upon connection. Firmware updates are delivered via secure USB flash drive—no internet dependency required for deployment in regulated or air-gapped lab environments.
Applications
- Routine protein verification in dairy processing plants (raw milk intake, UHT milk, whey protein concentrates)
- Adulteration screening at border inspection labs (e.g., melamine-tainted milk powder imports)
- Nutritional labeling compliance for soy-based infant formulas and plant-milk alternatives
- QC release testing in egg-processing facilities (albumen powder, dried yolk)
- Field-deployable verification in mobile agricultural testing units and provincial food safety surveillance programs
- Research applications requiring rapid protein profiling across multi-source sample sets (e.g., comparative studies of colostrum batches across lactation stages)
FAQ
Does the GDYN-200S require daily recalibration?
No—factory-calibrated optical and electronic subsystems maintain stability over 30 days under normal use. A single-point verification using certified reference material (CRM) is recommended before each analytical session.
Can it analyze ultra-high-protein samples like whey isolate (>90%)?
Not directly—the upper limit is 80% for dried colostrum powder. Samples exceeding specified ranges must be diluted with assay buffer and corrected mathematically.
Is the reagent kit compatible with other instruments?
The proprietary colorimetric reagent formulation is optimized exclusively for the GDYN-200S optical path and reaction kinetics; cross-platform use is not supported.
What maintenance is required beyond routine cleaning?
Annual verification of photometric linearity and temperature sensor drift is advised; no consumable optical components (e.g., lamps) require replacement within the first five years of operation.
How does it handle viscous or particulate-laden samples like whole egg homogenate?
Samples must be centrifuged (≥3000 × g, 5 min) or filtered (0.45 µm) prior to injection to prevent flow-path clogging; the instrument does not include integrated filtration.
