Hanuo ZF-7 Portable UV Transilluminator and Gel Cutter

Overview

The Hanuo ZF-7 Portable UV Transilluminator and Gel Cutter is a compact, field-deployable instrument engineered for rapid visualization and precise excision of nucleic acid bands in agarose or polyacrylamide gels. It operates on the principle of ultraviolet-induced fluorescence: when DNA or RNA intercalated with ethidium bromide (EtBr), SYBR® Safe, or other UV-excitable dyes is irradiated at specific wavelengths, it emits visible orange-red light, enabling real-time detection without gel staining post-electrophoresis. The ZF-7 integrates dual-wavelength UV emission (254 nm and 365 nm) to accommodate diverse fluorophore excitation profiles—254 nm offers higher sensitivity for EtBr-stained DNA, while 365 nm minimizes photodamage to labile samples and reduces background autofluorescence in protein gels or thin-layer chromatography (TLC) plates. Its lightweight aluminum chassis (≤1.8 kg), integrated handle, and low-power 6 W lamp design support battery-compatible operation via external DC adapters (optional), making it suitable for teaching labs, field diagnostics, mobile biosafety units, and resource-limited settings where benchtop transilluminators are impractical.

Key Features

• Compact handheld form factor with ergonomic grip and integrated UV shield flap for operator safety
• Dual-band UV output (254 nm and 365 nm) via independently switchable lamps—no filter swapping required
• High-transmission UV filter (50 × 200 mm) fabricated from optical-grade fused silica with <95% peak transmission at target wavelengths
• Low-heat, long-life UV fluorescent tubes engineered for stable irradiance output over >2,000 hours of cumulative use
• CE-compliant electrical architecture meeting IEC 61010-1 for laboratory equipment safety (overvoltage category II, pollution degree 2)
• Integrated timer circuit with auto-shutoff after 15 minutes to prevent accidental exposure and lamp degradation

Sample Compatibility & Compliance

The ZF-7 supports visualization of nucleic acids stained with ethidium bromide, GelRed®, GelGreen®, SYBR® Gold, and similar intercalating dyes; it is also compatible with UV-active compounds in TLC, HPTLC, and paper chromatography—including amino acids, alkaloids, flavonoids, and mycotoxins such as aflatoxin B1. For forensic applications, it enables latent fingerprint development using cyanoacrylate fuming followed by UV excitation. All UV exposure protocols align with OSHA and ICNIRP occupational exposure limits for UVC (254 nm) and UVA (365 nm). The device does not incorporate UV-blocking eyewear but is intended for use with ANSI Z87.1-rated UV-protective goggles and lab coats. It meets no regulatory requirement for FDA 21 CFR Part 11 compliance, as it generates no electronic records; however, its consistent irradiance profile supports GLP-aligned documentation when paired with calibrated imaging systems.

Software & Data Management

The ZF-7 is a standalone hardware-only instrument with no embedded firmware, touchscreen interface, or data logging capability. It functions as an illumination source only—image capture and analysis must be performed externally using DSLR cameras, smartphone adapters, or dedicated gel documentation systems (e.g., Bio-Rad ChemiDoc, Azure Biosystems cSeries). No proprietary drivers or software installation is required. For audit-trail integrity in regulated environments, users are advised to record operational parameters (wavelength selected, exposure duration, sample ID) manually in bound lab notebooks or LIMS-integrated electronic notebooks compliant with 21 CFR Part 11 requirements.

Applications

• Routine visualization and band excision during molecular cloning workflows, including PCR product verification and restriction digest analysis
• Teaching laboratory instruction in undergraduate biochemistry and genetics courses due to portability and intuitive operation
• On-site quality control in pharmaceutical manufacturing for thin-layer chromatographic purity assessment of APIs and excipients
• Field-based food safety screening for aflatoxin contamination in grains and nuts using immunoaffinity column–UV coupling methods
• Forensic trace evidence examination, including fiber identification and latent print enhancement in crime scene investigation units
• Textile authenticity verification through differential UV fluorescence response of natural vs. synthetic fibers

FAQ

Is the ZF-7 suitable for UV crosslinking of nucleic acids?
No—the 6 W lamp intensity and lack of calibrated irradiance dosimetry render it unsuitable for nucleic acid crosslinking, which requires controlled UVC doses (typically ≥100 mJ/cm² at 254 nm) delivered by dedicated UV crosslinkers.
Can the UV filter be replaced if scratched or clouded?
Yes—Hanuo supplies OEM replacement filters (part number HN-ZF7-FIL-254/365) with certified spectral transmission curves; third-party filters are not recommended due to risk of wavelength shift or reduced transmission.
Does the unit include protective eyewear?
No—ANSI Z87.1-certified UV-blocking goggles must be sourced separately and worn during all operational use per institutional biosafety policies.
What is the expected service life of the UV lamps?
Rated for ≥2,000 hours at nominal voltage; performance degrades gradually—lamp replacement is recommended when band visibility decreases despite clean filter and optimal dye concentration.
Is the ZF-7 compatible with blue-light excitable dyes such as SYBR® Safe?
No—it emits only 254 nm and 365 nm UV; blue-light dyes require ~470 nm excitation and necessitate LED-based transilluminators with appropriate optical filters.