기술 자료실
케이랩 분석 기기의 원리, 구성 요소, 측정 방법에 대한 심층적인 기술 해설.
32 articles
NIST-Traceable Calibration Standards
NIST-traceable standards provide a documented chain of measurement accuracy linking laboratory instruments to national reference values.
자세히 보기 →QbD and PAT in Pharmaceutical Manufacturing
Quality by Design and Process Analytical Technology are FDA frameworks that use real-time measurement to build quality into manufacturing processes.
자세히 보기 →Audit Trails and Electronic Signatures
Audit trails and electronic signatures are foundational data integrity controls required by FDA and global regulatory agencies.
자세히 보기 →FDA 21 CFR Part 11 for Spectrophotometers
FDA 21 CFR Part 11 sets the requirements for electronic records and signatures in regulated laboratory environments.
자세히 보기 →IQ/OQ/PQ: the 3Q Validation Framework
IQ OQ PQ are the three qualification stages required to validate analytical instruments in GxP regulated environments.
자세히 보기 →Spectral Preprocessing: Smoothing and Derivatives
Spectral preprocessing removes baseline drift and noise from raw spectra before chemometric modeling, improving the accuracy of NIR and Raman analysis.
자세히 보기 →Statistical Metrics: R-squared, %CV, %RE Explained
R-squared, percent coefficient of variation, and percent relative error are the three core statistics for assessing calibration fit quality and measurement precision.
자세히 보기 →Curve-Fitting Models: Linear, 4PL, 5PL, Cubic Spline
Choosing the right curve-fitting model is essential for accurate quantitation across linear assays, ELISA immunoassays, and complex dose-response experiments.
자세히 보기 →Building a Calibration Curve
A calibration curve maps instrument response to known analyte concentrations so unknown samples can be accurately quantified.
자세히 보기 →Inline Process Measurement (PAT)
Process Analytical Technology uses inline spectroscopic probes to monitor critical quality attributes in real time during manufacturing.
자세히 보기 →Color Analysis: ADMI and ASTA Methods
ADMI and ASTA are standardized UV-Vis methods for quantifying color in wastewater and red spices using defined absorbance measurements.
자세히 보기 →Enzyme Kinetics Measurement
Enzyme kinetics measurement tracks absorbance change over time to determine reaction rates, Michaelis-Menten constants, and inhibitor effects.
자세히 보기 →Endotoxin Testing: the Kinetic Turbidimetric Method
The kinetic turbidimetric LAL method quantifies bacterial endotoxin by tracking rising absorbance over time in a microplate reader.
자세히 보기 →ELISA: Principles and Workflow
ELISA uses enzyme-linked antibodies to detect and quantify proteins in solution, converting binding events into a measurable color change read by a…
자세히 보기 →Protein Assays Compared: Bradford, BCA, Biuret, Lowry
Bradford, BCA, Biuret, and Lowry assays each convert protein concentration into a measurable color change through different chemical mechanisms and working ranges.
자세히 보기 →Nucleic Acid Quantification and the A260/A280 Ratio
Measuring absorbance at 260 nm and 280 nm gives both concentration and purity of DNA and RNA samples in a single rapid…
자세히 보기 →Microvolume Measurement: How 1 uL Works
Microvolume spectrophotometers measure as little as 1 uL by compressing a liquid drop into an ultra-thin optical film between two surfaces.
자세히 보기 →Sapphire Windows and Optical Materials
Sapphire combines exceptional hardness and broad UV-to-NIR transmission with chemical inertness, making it the ideal optical window for harsh inline process environments.
자세히 보기 →Cuvettes and Path Length: Choosing the Right Cell
Cuvette material and path length determine which wavelengths can be measured and set the practical concentration range for any UV-Vis assay.
자세히 보기 →Detectors: Silicon Photodiode vs. CMOS Array vs. InGaAs
Detector choice determines spectral range and measurement speed; silicon photodiodes, CMOS arrays, and InGaAs devices each serve distinct analytical needs.
자세히 보기 →Diffraction Gratings Explained
Diffraction gratings use microscopic periodic grooves to disperse light into its component wavelengths, forming the heart of modern spectrophotometers.
자세히 보기 →Monochromator and the Czerny-Turner Design
A monochromator isolates a narrow band of wavelengths from broadband light; the Czerny-Turner layout is the industry standard for compact UV-Vis instruments.
자세히 보기 →The Xenon Flash Lamp
Xenon flash lamps deliver intense broadband light in microsecond pulses, enabling stable low-noise measurements in modern spectrophotometers.
자세히 보기 →NIR: Overtones and Combination Bands
NIR absorption arises from overtones and combination bands of molecular vibrations, enabling non-destructive chemical analysis through intact packaging and vessels.
자세히 보기 →How Raman Scattering Works
Raman scattering produces wavelength-shifted photons that reveal molecular bond vibrations, providing a chemical fingerprint without sample preparation.
자세히 보기 →What Is Stray Light and Why It Matters
Stray light is out-of-band radiation reaching the detector and is the dominant source of error at high absorbance in UV-Vis spectrophotometers.
자세히 보기 →Absorbance vs. Transmittance
Absorbance and transmittance are two ways to express how much light a sample absorbs, linked by a simple logarithmic relationship.
자세히 보기 →Single-Beam vs Double-Beam Spectrophotometers
Both designs measure absorbance, but they handle the reference differently. The choice affects stability, speed, and cost.
자세히 보기 →The Beer–Lambert Law Explained
The Beer–Lambert law links absorbance to concentration, making quantitative analysis possible. Here is what it says and where it holds.
자세히 보기 →Tungsten-Halogen vs. Deuterium Lamps
UV-Vis spectrophotometers use two complementary light sources. Here is why both are needed and how the instrument switches between them.
자세히 보기 →What Is Wavelength?
Wavelength is the distance between successive peaks of a light wave. It determines a photon's energy and underpins every spectroscopic measurement.
자세히 보기 →How UV-Vis Spectroscopy Works
Ultraviolet–visible spectroscopy measures how much light a sample absorbs at each wavelength, revealing concentration, purity, and molecular information.
자세히 보기 →