Spectrophotometer Analysis
Spectrophotometer Analysis - Related Videos
07:38
Introduction to the Spectrophotometer
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2023
The spectrophotometer is a routinely used instrument in scientific research. Spectrophotometry is the quantitative measurement of how much a chemical substance absorbs light by passing a beam of light through the sample using a spectrophotometer. In this video, basic concepts in spectrophotometry, including transmittance, absorbance and the Beer-Lambert Law are reviewed in addition to the components of the spectrophotometer. These concepts provide a foundation for how to determine the...
07:44
Quantification of dsDNA using the Hitachi F-7000 Fluorescence Spectrophotometer and PicoGreen Dye
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Cited by 6 •
2010
Demonstration of quantification of dsDNA using Molecular Probes PicoGreen dye and Hitachi F-7000 Fluorescence Spectrophotometer equipped with a microplate reader accessory.
10:29
Microvolume Protein Concentration Determination using the NanoDrop 2000c Spectrophotometer
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Cited by 129 •
2009
Microvolume samples are quantified by a spectrophotometer system that uses natural surface tension to retain samples without the use of cuvettes or capillaries. The dynamic range of protein concentrations and speed by which they can be measured are greatly increased with this method.
06:15
Concentration Determination of Nucleic Acids and Proteins Using the Micro-volume Bio-spec Nano Spectrophotometer
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Cited by 19 •
2011
This communication presents data on the accuracy and reproducibility of the BioSpec-nano UV-VIS spectrophotometer for dsDNA and protein quantitation. Even with ultra-small volumes (1 to 2 L), reproducibility is excellent, while the automated wiping function improves throughput and results in minimal carryover for more precise results.
15:04
A Neuronal and Astrocyte Co-Culture Assay for High Content Analysis of Neurotoxicity
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Cited by 46 •
2009
This article describes a novel protocol and reagent set designed for sensitive measurement of neurotoxic effects of compounds and treatments on co-cultures of neurons and astrocytes using high content analysis. Results demonstrate that high content analysis represents an exciting novel technology for neurotoxicity assessment.
FAQs
Selecting the wavelength is central because the instrument evaluates sample behavior at that specific part of the light spectrum. Comparing readings across selected wavelengths can help distinguish or estimate biological substances, while a wavelength chosen without regard to the analyte may provide less informative data. This makes wavelength selection an analytical decision, not merely an instrument setting.
Beer-Lambert law provides the quantitative link between absorbance and analyte concentration. When its suitable conditions are met, a measured absorbance can support concentration estimates rather than only a qualitative comparison. This relationship is especially useful when biological samples must be compared systematically, because the optical measurement becomes interpretable in concentration terms.
Absorbance and transmission describe different views of the same optical measurement. Transmission reflects the light that passes through the sample, whereas absorbance represents the converted difference between incoming and transmitted intensity. Using absorbance is valuable in biological analysis because it supplies the measurement used with the Beer-Lambert relationship for estimating analyte concentration.
A typical analysis proceeds by directing light through the sample, comparing the incoming and transmitted intensities, and converting that comparison into absorbance. The analyst then interprets the absorbance under suitable conditions, often through the Beer-Lambert relationship. Keeping the wavelength and measurement approach consistent supports reproducible comparisons among biological samples.
The method can quantify or monitor nucleic acids, proteins, pigments, enzyme activity, and cell density. These applications use the optical readout for different purposes: concentration estimation for substances, reaction monitoring for enzyme activity, and comparative assessment of cell density. Its breadth makes it useful across multiple types of biological research rather than a single assay.
Rapid, non-destructive readouts make it useful when researchers need concentration estimates, reaction monitoring, or reproducible comparisons without consuming the sample through the measurement itself. The approach can therefore support repeated or comparative biological observations, provided measurements are made under suitable conditions for the intended interpretation.