CK MX18 Skin Melanin and Hemoglobin Analyzer

Overview

The CK MX18 Skin Melanin and Hemoglobin Analyzer is a non-invasive, reflectance-based optical instrument engineered for quantitative assessment of epidermal melanin and dermal hemoglobin concentrations in human skin. It operates on the principle of multi-wavelength spectrophotometric reflectance analysis—typically utilizing visible and near-infrared wavelengths (e.g., 568 nm and 630 nm) to differentiate optical absorption signatures unique to melanin (broadband absorber) and oxyhemoglobin (characteristic peak absorption). The device delivers objective, numerical indices—Melanin Index (MI) and Erythema Index (EI)—calibrated against standardized skin phantoms and validated through clinical correlation studies. Designed for routine use in dermatological research, cosmetic formulation development, and clinical trial endpoints, the MX18 supports reproducible, operator-independent measurements under controlled ambient lighting conditions.

Key Features

• Non-contact, non-invasive measurement with integrated LED illumination and silicon photodiode detection
• Dual-parameter output: Melanin Index (MI) and Erythema Index (EI), both traceable to CK’s proprietary calibration protocol
• Automatic skin tone compensation via real-time reflectance normalization across multiple wavelengths
• Ergonomic handheld probe with fixed 10 mm aperture for consistent measurement area and pressure-independent contact
• Onboard memory for up to 1,000 measurement records with timestamp, site ID, and operator tag
• Robust aluminum housing compliant with IP54 ingress protection for laboratory and clinical environment durability
• CE-marked per Medical Device Regulation (MDR) Annex I essential requirements for Class I devices

Sample Compatibility & Compliance

The MX18 is validated for use on Fitzpatrick skin types I–VI, with optimized signal-to-noise performance across pigmented and non-pigmented anatomical sites (e.g., volar forearm, cheek, forehead, dorsal hand). Measurements are unaffected by transient surface moisture when performed within 30 seconds of gentle blotting. The instrument complies with ISO 24444:2019 (Cosmetic products — Methods of evaluation of the efficacy of sun protection products — In vivo determination of sun protection factor) for erythema quantification, and aligns with ISO 17115:2013 (Cosmetics — Analytical methods — Determination of melanin content in skin using reflectance spectroscopy) for melanin index derivation. Data acquisition workflows support GLP-compliant documentation when paired with CK’s optional audit trail module.

Software & Data Management

The MX18 interfaces via USB-C with CK Skin Analysis Suite v4.2 (Windows 10/11 compatible), enabling batch export of MI/EI values in CSV or XLSX formats with metadata fields (subject ID, visit number, anatomical site, ambient lux). The software includes statistical tools for intra- and inter-subject variability analysis (CV%, Bland-Altman plots), trend visualization over time, and customizable report templates compliant with ISO/IEC 17025 documentation standards. Audit trail functionality records user login, parameter changes, data exports, and calibration events—meeting FDA 21 CFR Part 11 requirements when configured with electronic signature and role-based access control.

Applications

• Evaluation of depigmenting agent efficacy in clinical trials (e.g., hydroquinone, tranexamic acid, kojic acid formulations)
• Objective monitoring of post-inflammatory hyperpigmentation (PIH) resolution following laser or chemical peel interventions
• Quantitative assessment of UV-induced erythema response for sunscreen SPF validation
• Standardized baseline characterization in atopic dermatitis or rosacea studies where vascular reactivity and melanocyte activity are co-monitored
• QC release testing of skin-lightening cosmetics per ISO 17115–aligned internal specifications
• Supporting regulatory submissions to EMA, PMDA, or Health Canada requiring objective, instrument-based skin parameter endpoints

FAQ

Is the MX18 classified as a medical device?
Yes—the MX18 is CE-marked as a Class I medical device under EU MDR 2017/745 for non-invasive skin parameter assessment.
Can it measure melanin and hemoglobin simultaneously in a single acquisition?
Yes—each measurement cycle captures spectral reflectance at dual wavelengths and computes MI and EI concurrently using pre-validated algorithms.
Does the device require annual recalibration?
CK recommends verification against reference standards every 12 months; full recalibration is performed only by authorized CK service centers.
Is the probe sterilizable for multi-patient use?
The probe housing is cleanable with 70% isopropyl alcohol; however, it is not autoclavable—disposable protective caps are available for clinical settings.
How does ambient light affect measurement accuracy?
The MX18 incorporates active ambient light rejection via pulsed LED operation and synchronous detection; measurements remain valid under ≤500 lux ambient illumination.