Sanotac UV2000D Dedicated UV-Vis Detector for Counter-Current Chromatography

Overview

The Sanotac UV2000D is a purpose-engineered UV-Vis absorbance detector designed exclusively for counter-current chromatography (CCC), high-speed CCC (HSCCC), and centrifugal partition chromatography (CPC). Unlike general-purpose HPLC detectors, the UV2000D addresses the unique analytical demands of preparative-scale liquid–liquid partition separations—where sample loads are significantly higher, mobile phase composition varies widely, and baseline stability across broad wavelength ranges is critical. Its dual-beam optical architecture employs simultaneous reference and sample beam monitoring to compensate for lamp intensity fluctuations and solvent absorption drift, ensuring robust signal integrity during extended fraction collection runs. The integrated deuterium and tungsten-halogen light sources provide continuous spectral coverage from 190 nm to 800 nm, enabling detection of diverse analytes—from aromatic compounds and nucleic acid derivatives absorbing in the far-UV, to conjugated pigments and metal complexes exhibiting visible-range transitions.

Key Features

• Dual-wavelength real-time detection: Simultaneous monitoring at two user-selectable wavelengths supports co-elution analysis of major components, by-products, and impurities without sequential scanning delays.
• Adjustable flow cell path length (0.2–5 mm): Optimized for both trace-level analytical detection and high-concentration preparative applications—eliminating the need for post-column dilution or flow splitting.
• High-stability optical train: Features a JY (France) precision holographic grating and Heraeus (Germany) deuterium lamp, delivering enhanced photon flux below 220 nm and sub-nanometer wavelength reproducibility (±0.2 nm).
• Direct-drive IMS stepper motor: Eliminates gear backlash and thermal hysteresis, ensuring accurate, repeatable monochromator positioning over thousands of operational cycles.
• Intelligent lamp switching logic: Automatic transition between deuterium (190–350 nm) and tungsten (350–800 nm) sources based on selected wavelength—minimizing warm-up time and maximizing lamp service life.
• Externally mounted, chemically resistant flow cell: Designed for rapid cleaning, solvent compatibility verification, and seamless integration with standard CCC tubing interfaces (1/16″ and 1/8″).
• Onboard 24-bit analog-to-digital conversion: Digitizes photodiode output at the detector head—preventing signal degradation during transmission and supporting noise floors as low as ±0.5 × 10⁻⁵ AU (254 nm, 1 s time constant).

Sample Compatibility & Compliance

The UV2000D maintains stable baseline performance across common CCC solvent systems—including n-butanol–acetic acid–water (BAW), ethyl acetate–methanol–water (EMW), and chloroform–methanol–water (CMW)—without requiring active temperature stabilization. Its thermally isolated optical housing mitigates ambient-induced noise drift, making it suitable for use in non-climate-controlled prep labs. While not certified to ISO/IEC 17025 or FDA 21 CFR Part 11 out-of-the-box, the detector’s open ASCII communication protocol and audit-ready digital logging (via optional PC software) support integration into GLP-compliant workflows. It meets ASTM E260 and USP requirements for wavelength accuracy and photometric linearity when operated within specified environmental conditions (15–30 °C, <80% RH).

Software & Data Management

The UV2000D supports dual-mode operation: standalone control via its 4.7-inch graphical LCD and full remote operation through PC-based software (included). The embedded firmware provides ten programmable methods, each storing wavelength pairs, time constants, gain settings, and auto-zero parameters. Data export is supported in CSV format with timestamped absorbance values at user-defined intervals. Its open RS-232/USB interface enables native integration with third-party chromatography data systems—including N2000 (China), Chromeleon (Thermo Fisher), and Clarity (DataApex)—via custom driver development. Optional analog output (0–1 V or 0–5 V) ensures backward compatibility with legacy chart recorders and PLC-based fraction collectors.

Applications

• Preparative isolation of natural products (alkaloids, flavonoids, terpenes) from plant extracts using pH-zone-refining CCC.
• Process monitoring of chiral separations in enantioselective CPC, where dual-wavelength tracking distinguishes enantiomer elution profiles from racemic impurities.
• Quantitative assessment of degradation products during forced degradation studies of biologics in aqueous–organic biphasic systems.
• In-line monitoring of multi-step purification cascades combining CPC with tangential flow filtration (TFF) or diafiltration.
• Method development for separation of metal–ligand complexes in hydrometallurgical process streams.

FAQ

Is the UV2000D compatible with non-Sanotac CCC instruments?
Yes—the detector features universal 1/16″ and 1/8″ PEEK fittings and supports analog voltage output, enabling mechanical and electrical integration with all major CCC platforms, including Tokyo Rikakikai, QuattroPhase, and SomaTech systems.
Can the flow cell be cleaned in situ without disassembly?
Yes—its external mounting design and chemically inert quartz/sapphire optical windows allow solvent flushing under pressure using standard lab-grade solvents (e.g., methanol, acetonitrile, 10% nitric acid) without removal from the flow path.
Does the detector support GLP-compliant electronic records?
When used with validated third-party CDS software that implements 21 CFR Part 11 controls (e.g., audit trail, electronic signatures, user access levels), the UV2000D’s digital output and method storage fully support GLP/GMP documentation requirements.
What is the recommended maintenance interval for the deuterium lamp?
Under typical usage (≤8 h/day), the Heraeus lamp achieves >2,000 hours of stable output; replacement is advised when baseline noise exceeds ±1.0 × 10⁻⁵ AU at 254 nm or when wavelength calibration drift exceeds ±1.5 nm after auto-correction.
How does the dual-beam design improve low-wavelength stability?
By continuously comparing sample and reference beam intensities at sub-second intervals, the system dynamically corrects for deuterium lamp intensity decay and solvent absorption changes—particularly critical below 210 nm where ozone absorption and solvent cutoff effects dominate baseline behavior.