AOE U120Pro Ultraviolet-Visible Spectrophotometer
| Brand | AOE |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | U120Pro |
| Price Range | USD 1,400–2,800 |
| Optical Design | Single-beam |
| Detector Type | Silicon Photocell |
| Wavelength Range | 195–1100 nm |
| Wavelength Scanning Mode | Motorized Auto-Scanning |
| Spectral Bandwidth | 4.0 nm |
| Wavelength Accuracy | ±1.0 nm |
| Stray Light | ≤0.1% T at 220 nm and 340 nm |
| Wavelength Repeatability | ≤0.2 nm |
| Baseline Stability | ±0.001 Abs/h at 500 nm |
Overview
The AOE U120Pro Ultraviolet-Visible Spectrophotometer is a precision single-beam optical instrument engineered for routine quantitative and qualitative analysis in academic laboratories, quality control environments, and industrial R&D settings. It operates on the fundamental principle of Beer–Lambert law-based absorbance measurement, utilizing a high-efficiency holographic grating (1200 lines/mm) to resolve spectral features across a broad photometric range from 195 nm to 1100 nm—encompassing deep UV, visible, and near-infrared regions. Its fixed 4.0 nm spectral bandwidth ensures consistent resolution for standard applications such as concentration determination, kinetic assays, and purity verification of organic and inorganic compounds. Designed with mechanical and thermal stability as core priorities, the U120Pro delivers baseline drift of no more than ±0.001 Abs per hour at 500 nm—critical for extended time-course experiments or multi-sample batch analysis under ambient lab conditions.
Key Features
- Single-beam optical architecture with motorized wavelength drive enabling fully automated scanning and peak search functionality
- Holographic blazed grating (1200 grooves/mm) optimized for high diffraction efficiency and low polarization dependence across the UV-Vis-NIR spectrum
- Silicon photocell detector offering robust linearity, low dark current, and long-term signal consistency without cryogenic cooling
- Digital wavelength calibration traceable to NIST-traceable holmium oxide and didymium filters, supporting internal validation protocols
- Integrated cuvette holder accommodating standard 10 mm pathlength cells (also compatible with micro-volume adapters upon optional configuration)
- Front-panel LCD interface with dedicated function keys for rapid method recall, zeroing, and absorbance/transmittance mode switching
Sample Compatibility & Compliance
The U120Pro accommodates liquid samples in quartz, glass, or plastic cuvettes (10 mm pathlength standard), with compatibility extending to solid thin films via optional reflectance accessories. It supports common solvent systems—including water, methanol, acetonitrile, and buffer solutions—without optical interference in the operational wavelength window. The instrument complies with ISO 9001 quality management requirements for manufacturing and documentation control. While not pre-certified for regulated GxP environments, its stable photometric performance, wavelength repeatability (≤0.2 nm), and stray light specification (≤0.1% T) align with foundational expectations outlined in ASTM E275, ISO 6059, and USP <857> for spectrophotometric system suitability testing. Users implementing the U120Pro in GLP or GMP workflows may supplement it with external audit trails, manual logbooks, and periodic verification using certified reference materials.
Software & Data Management
The U120Pro operates standalone via its embedded firmware but integrates seamlessly with optional PC-based acquisition software (Windows 10/11 compatible) supporting CSV export, spectral overlay, first-/second-derivative calculation, and basic kinetic curve fitting. Data files include timestamped metadata (date, time, operator ID if entered manually, wavelength step, integration time). Though lacking native 21 CFR Part 11 compliance features (e.g., electronic signatures, role-based access control), the software permits full export of raw and processed data for import into validated LIMS or ELN platforms. All spectral scans are stored internally (up to 100 spectra) with overwrite protection enabled by default.
Applications
- Quantitative analysis of nucleic acids and proteins (A260/A280 ratio assessment)
- Pharmaceutical assay development and dissolution testing per USP chapters <711> and <724>
- Environmental monitoring of nitrate, phosphate, and heavy metal complexes (e.g., Cr(VI) diphenylcarbazide method)
- Food and beverage quality control—color index (CIE L*a*b*), anthocyanin content, and preservative quantification
- Chemical kinetics studies involving reaction progress monitoring at fixed or scanned wavelengths
- Educational laboratory instruction for teaching absorption spectroscopy fundamentals and calibration curve methodology
FAQ
Is the U120Pro suitable for regulatory submissions in pharmaceutical QC labs?
It is not designed for direct use in FDA-submitted analytical procedures requiring 21 CFR Part 11 compliance; however, it serves effectively for method development, in-house reference standard verification, and non-GMP stability screening.
Can I measure samples below 200 nm reliably?
The specified lower limit is 195 nm; measurements between 195–200 nm require purged optics or nitrogen purge to mitigate atmospheric oxygen absorption—this configuration is not included standard but can be implemented externally.
What maintenance is required for long-term wavelength accuracy?
Annual verification using holmium oxide (241, 279, 287, 333, 360, 418, 460, 536 nm peaks) and didymium (528.7, 573.0, 585.4, 643.8, 749.9, 807.7 nm) reference filters is recommended to confirm calibration integrity.
Does the instrument support USB or RS-232 connectivity?
Yes—standard RS-232 port is provided for legacy device integration; USB-to-RS232 adapters are commonly used for modern PC connection.
Is there an option for variable slit width or narrower bandwidth?
No—the 4.0 nm spectral bandwidth is fixed by optical design; users requiring sub-2 nm resolution should consider double-beam or array-based instruments with adjustable slits.
