WhYOKO YOKO-ZX UV Transilluminator Dark Box

Overview

The WhYOKO YOKO-ZX UV Transilluminator Dark Box is a purpose-engineered benchtop analytical support instrument designed for post-chromatographic visualization and documentation of fluorescent compounds in thin-layer chromatography (TLC), paper chromatography, and nucleic acid/protein gel electrophoresis. It operates on the principle of ultraviolet-induced fluorescence excitation: analytes labeled with or inherently possessing fluorophores (e.g., ethidium bromide-stained DNA, fluorescent dyes in TLC plates, or native aromatic amino acids) absorb UV photons at 254 nm or 365 nm and re-emit visible light, enabling high-contrast detection under controlled dark-field conditions. The integrated dark box eliminates ambient light interference, while its precisely engineered optical path ensures uniform irradiance across the viewing surface—critical for qualitative spot identification, R_f value measurement, and semi-quantitative comparative analysis per ASTM D7249 and ISO 10371 guidelines.

Key Features

• Optimized dual-wavelength UV illumination system with selectable configurations (ZX-A through ZX-D) to accommodate diverse fluorophore excitation profiles—254 nm for maximum sensitivity with aromatic compounds and nucleic acids; 365 nm for reduced photodegradation and enhanced safety during prolonged exposure.
• High-transmission UV filter (50 × 200 mm) fabricated from doped quartz-based optical glass, delivering ≥68% transmission at 254 nm and ≥86% at 365 nm—exceeding industry-standard filter performance by 1–2× compared to conventional borosilicate alternatives.
• Low-power (20 W total), thermally efficient design utilizing high-frequency electronic ballasts—eliminates warm-up delay, ensures instant-on operation, and maintains sample integrity by minimizing radiant heat accumulation (<15 °C surface temperature rise after 30 min continuous use).
• Compact, ergonomic enclosure (250 × 240 × 280 mm) constructed from UV-reflective matte-black ABS with seamless internal baffling to prevent stray-light scatter and ensure optimal contrast ratio (>1000:1).
• Integrated white fluorescent lamp (365 nm lamp doubles as visible illuminator) enables side-by-side comparison of UV-excited fluorescence and non-fluorescent reference marks or background features without instrument reconfiguration.

Sample Compatibility & Compliance

The YOKO-ZX supports standard TLC plates (silica gel F₂₅₄, alumina, cellulose), polyacrylamide and agarose gels (up to 15 cm × 15 cm), chromatography paper, and nitrocellulose membranes. Its fixed-wavelength UV sources comply with IEC 61000-4-3 for electromagnetic compatibility and meet CE marking requirements for laboratory electrical safety. While not classified as a medical device, its optical output adheres to ICNIRP 2010 exposure limits for occupational UV-A (315–400 nm) and UV-C (100–280 nm) radiation—validated via third-party radiometric calibration report (available upon request). For GLP-compliant labs, the unit supports traceable maintenance logs and routine intensity verification using NIST-traceable UV radiometers.

Software & Data Management

As a standalone visualization tool, the YOKO-ZX requires no proprietary software or drivers. Its analog interface enables direct integration with commercial digital imaging systems—including DSLR cameras, scientific CMOS detectors, and document scanners—via standard tripod mounts and timed exposure control. When paired with image acquisition platforms compliant with FDA 21 CFR Part 11 (e.g., ImageLab™, AlphaView SA), the system supports audit-trail-enabled capture, metadata tagging (wavelength, exposure time, date/time stamp), and encrypted storage of raw TIFF/PNG files—ensuring full data integrity for regulatory submissions and peer-reviewed publication workflows.

Applications

• TLC spot detection and R_f calculation for pharmaceutical impurity profiling (USP , EP 2.2.27)
• Fluorescence-based assay development for enzyme-substrate interactions and inhibitor screening
• Verification of DNA laddering in apoptosis studies and PCR product validation
• Visualization of dansyl chloride- or o-phthalaldehyde-labeled amino acids in HPTLC
• Educational demonstration of separation principles and fluorophore behavior in undergraduate chemistry labs

FAQ

Can the YOKO-ZX be used for UV-Vis densitometry quantification?
No—it provides qualitative/semi-quantitative visualization only. Quantitative densitometry requires calibrated CCD-based scanning systems with linear response correction (e.g., PerkinElmer TLC Visualizer or CAMAG Reprostar).
Is the 312 nm option (ZX-D) suitable for SYBR Safe staining?
Yes—312 nm offers optimal excitation efficiency for SYBR Safe and similar green-emitting dyes while reducing UV-induced DNA damage relative to 254 nm.
Does the unit include a UV-blocking viewing shield?
No—users must wear ANSI Z87.1-certified UV-absorbing safety goggles (OD ≥3 at 254 nm) during operation; the dark box itself attenuates >99.9% of reflected UV but does not replace personal protective equipment.
What is the expected lifetime of the UV lamps?
Rated for 1,500 hours at nominal voltage; output degrades gradually—intensity should be verified every 200 operating hours using a calibrated radiometer.
Can the filter be replaced with a custom bandpass filter?
Yes—the 50 × 200 mm slot accepts standard 2 mm-thick optical filters with compatible mounting frames; contact WhYOKO Technical Support for mechanical interface specifications.