Protein Solution
Protein Solution - Related Videos
03:43
Microscale Thermophoresis to Study Protein-Lipid Interactions in Solution
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2025
This video demonstrates microscale thermophoresis for studying the protein-lipid interaction. The assay detects the interaction between molecules by quantifying the thermophoretic movement of fluorescent-labeled proteins in response to a temperature gradient. The fluorescent molecule is mixed with different concentrations of the non-fluorescent lipid molecules, and the mixture of molecules in the solution is loaded into capillaries. A temperature gradient is applied to the samples in the...
06:42
Structure Solution of the Fluorescent Protein Cerulean Using MeshAndCollect
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Cited by 2 •
2019
We present the use of the MeshAndCollect protocol to obtain a complete diffraction data set, for use in subsequent structure determination, composed of partial diffraction data sets collected from many small crystals of the fluorescent protein Cerulean.
09:49
Solutions and Concentrations
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2023
Source: Laboratory of Dr. Michael Evans — Georgia Institute of Technology A solution is a homogeneous mixture containing some components in small amounts, called solutes, and one component in a large amount, called the solvent. Solid-liquid solutions contain one or more solid solutes dissolved in a liquid solvent. Solutions are ubiquitous in chemistry: they are used to store and handle small amounts of material, carry out chemical reactions, and develop materials with controllable properties.
07:27
Making Solutions in the Laboratory
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2023
The ability to successfully make solutions is a basic laboratory skill performed in virtually all biological and chemical experiments. A solution is a homogenous mixture of solute dissolved in bulk liquid known as the solvent. Solutions can be described by their solute concentration, a measure of how much solute is present per unit of solution. In this video, a step-by-step procedure for how to make a water-based, or aqueous, solution for biological applications is presented. The video...
02:12
General Properties of Solutions
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2020
Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. A solution is a homogeneous mixture that is...
FAQs
Near the isoelectric point, a protein has reduced net electrical charge, so electrostatic repulsion between molecules decreases. With less repulsion, molecules can approach one another more readily, increasing the likelihood of aggregation or precipitation. This condition is therefore important when maintaining a clear, usable solution or deliberately promoting protein separation during laboratory work.
These variables affect whether protein molecules remain soluble, stable, and biologically functional. Changes in pH alter molecular charge, while temperature and solvent composition can influence structural stability. Ionic strength changes the solution environment surrounding the proteins, and concentration affects how frequently molecules interact. Controlling these conditions improves the reliability of measurements and downstream applications.
Protein structure determines how a molecule interacts with other substances and performs its biological role. Conditions that promote instability, aggregation, or precipitation can interfere with that structure and reduce measurable activity. For this reason, solution composition and physical conditions should be controlled during biochemical studies, especially when the goal is to assess enzyme function or preserve a protein for later use.
In enzyme assays, a protein solution provides the controlled sample in which biological activity can be measured. Maintaining suitable solution conditions helps preserve the enzyme’s functional state and supports consistent comparisons between measurements. The same principle applies to broader biochemical analyses, where changes in protein behavior, interactions, or activity must be distinguished from effects caused by poor solution stability.
Protein solutions provide the starting material for manipulating proteins during purification and crystallization. Adjusting conditions can help keep a target protein dissolved, or, when appropriate, encourage aggregation or precipitation that separates it from other components. In crystallization, controlled solution conditions support the formation of organized protein material needed for subsequent structural study.
Drug formulations require conditions that help preserve protein stability and function during use. Similarly, cell-based research depends on protein preparations whose composition and activity are sufficiently consistent for biological testing. Monitoring factors such as pH, temperature, ionic strength, solvent composition, and concentration helps reduce unwanted changes and supports more reliable experimental or applied outcomes.