Yoke i4 UV-Vis Spectrophotometer

Overview

The Yoke i4 UV-Vis Spectrophotometer is a single-beam, microprocessor-controlled optical instrument engineered for routine and research-grade absorbance and transmittance measurements across the ultraviolet, visible, and near-infrared spectral regions (190–1100 nm). It operates on the principle of Beer–Lambert law-based photometric analysis, utilizing a high-stability tungsten-halogen and deuterium dual light source with automatic lamp switching, coupled with a precision imported diffraction grating and a linear photodiode array detector. Its optical design ensures consistent spectral resolution (4 nm bandwidth), low stray light (<0.5% T at 420 nm using NaNO₂ reference), and high photometric linearity over a broad dynamic range (–0.3 to 3.0 A). Designed for laboratory environments where reliability, ease of operation, and regulatory-compliant data handling are essential, the i4 delivers reproducible results suitable for QC/QA workflows in pharmaceuticals, environmental testing, food science, and academic chemistry labs.

Key Features

• 7-inch high-resolution capacitive touchscreen (1024 × 768) enabling intuitive, gesture-supported navigation and real-time visualization of spectra, kinetic traces, and calibration curves
• Integrated Wi-Fi, Bluetooth 4.2, and USB 2.0 interfaces supporting direct wireless data export, remote firmware updates, and seamless connectivity with LIMS or ELN systems
• Automated wavelength calibration and dual-lamp control system ensuring accurate spectral alignment and extended source lifetime (≥2000 h for deuterium, ≥5000 h for tungsten-halogen)
• High-speed spectral scanning (up to 3000 nm/min) with <1 nm wavelength repeatability and ±2 nm absolute accuracy—validated per ISO 9001-aligned internal QA protocols
• Embedded cloud synchronization via YOKE@Cloud Data platform; QR-code-initiated pairing enables secure, timestamped data upload with optional role-based access control
• Comprehensive onboard software suite supporting quantitative analysis (single/multi-point calibration), nucleic acid/protein quantification (A260/A280 ratio, extinction coefficient input), kinetics (time-scan up to 9999 points), and derivative spectroscopy

Sample Compatibility & Compliance

The i4 accommodates standard 10 mm pathlength cuvettes (glass, quartz, or plastic), as well as optional accessories including microvolume holders (0.5–2 µL), temperature-controlled cells (±0.1 °C stability), and fiber-optic probes for remote or in-situ measurements. It supports compliance-critical workflows through audit-trail-enabled software logging (user ID, timestamp, parameter changes, result exports), aligning with GLP documentation requirements. While not pre-certified to FDA 21 CFR Part 11, its data integrity architecture—including immutable raw-data storage, electronic signature readiness, and exportable .csv/.xlsx reports—facilitates validation under ISO/IEC 17025 or USP analytical instrument qualification frameworks.

Software & Data Management

The embedded operating system features a modular application interface with password-protected user levels (Operator, Supervisor, Administrator). All measurement sessions generate structured metadata files containing instrument configuration, environmental conditions (if external sensor connected), and full spectral datasets. Data can be exported locally via USB or wirelessly to network drives, email, or YOKE@Cloud with AES-256 encryption. Optional PC-based YokeSpectra Pro software extends functionality with batch processing, method templates, statistical reporting (RSD%, confidence intervals), and integration with third-party platforms via OPC UA or RESTful API.

Applications

• Quantitative determination of active pharmaceutical ingredients (APIs) per USP and EP 2.2.25 guidelines
• Enzyme kinetics monitoring (e.g., NADH/NADPH oxidation at 340 nm) and reaction rate profiling
• Water quality analysis: nitrate (220/275 nm), phosphate (880 nm), COD estimation (600 nm)
• Nucleic acid purity assessment (A260/A280 >1.8, A260/A230 >2.0) and concentration calculation using ε₂₆₀ values
• Colorimetric assays (e.g., Bradford, Lowry, BCA) with multi-wavelength correction and background subtraction
• Educational laboratories: demonstration of Lambert–Beer law, spectral identification, and solvent effects on λ_max

FAQ

Does the i4 support GMP/GLP-compliant data archiving?
Yes—the instrument logs all user actions, method parameters, and raw spectra with timestamps and operator IDs. Exported data includes hash-verified metadata, enabling traceability required for internal audits.
Can the i4 perform simultaneous multi-wavelength measurements?
It acquires full spectra (190–1100 nm) in a single scan using its PDA detector; post-acquisition, users may extract and overlay absorbance values at any number of user-defined wavelengths.
Is quartz cuvette compatibility confirmed across the full 190–1100 nm range?
Yes—standard fused silica cuvettes transmit effectively from 190 nm onward; UV-grade quartz is recommended below 220 nm for optimal signal-to-noise ratio.
What validation documentation is provided with the instrument?
Each unit ships with a Factory Calibration Certificate (traceable to NIST SRM 930e for photometric accuracy and Holmium Oxide for wavelength verification), IQ/OQ checklist templates, and a complete electronic user manual compliant with IEC 62304 software lifecycle standards.
How is wavelength accuracy maintained over time?
The i4 performs automatic self-alignment during startup using internal holmium oxide and didymium references; periodic verification with certified standards is recommended every 6 months per ISO/IEC 17025 Clause 5.5.2.