Guanidine Thiocyanate
Guanidine Thiocyanate - Related Videos
09:45
Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
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Cited by 2 •
2017
A protocol for the synthesis of alkyl-modified guanidines based on the use of the corresponding precursors is presented.
17:02
Beer's Law - Student Protocol
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Lab Setup for Beer’s LawExpand In this lab, you will combine aqueous solutions of FeCl3 and NaSCN to form an orange-red [Fe(NCS)]2+ complex. When FeCl3 is dissolved in water, the iron center is surrounded by six water molecules. This acidic complex easily loses protons from its water molecules, which can lead to iron hydroxides precipitating from solution. To prevent this, your solutions will include enough HNO3 to keep the iron in...
06:35
Beer's Law - Instructor Prep
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparation of SolutionsExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. To set up for this lab experiment, wear the appropriate personal protective equipment, including a lab coat, chemical splash goggles, and gloves. Note: You will be working with nitric acid, which is toxic and corrosive, so use caution when handling it. Let's start by...
08:37
Le Châtelier's Principle
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2023
Source: Laboratory of Dr. Lynne O'Connell — Boston College When the conditions of a system at equilibrium are altered, the system responds in such a way as to maintain the equilibrium. In 1888, Henri-Lewis Le Châtelier described this phenomenon in a principle that states, "When a change in temperature, pressure, or concentration disturbs a system in chemical equilibrium, the change will be counteracted by an alteration in the equilibrium composition." This experiment demonstrates Le Châtelier's...
09:03
Spectrophotometric Determination of an Equilibrium Constant
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2023
Source: Laboratory of Dr. Michael Evans — Georgia Institute of Technology The equilibrium constant, K, for a chemical system is the ratio of product concentrations to reactant concentrations at equilibrium, each raised to the power of their respective stoichiometric coefficients. Measurement of K involves determination of these concentrations for systems in chemical equilibrium. Reaction systems containing a single colored component can be studied spectrophotometrically. The relation between...
FAQs
Its chaotropic activity weakens hydrogen bonding and other interactions that maintain protein structure. As proteins lose their native conformations, cellular membranes are disrupted and membrane-associated components become accessible. This coordinated denaturation and lysis helps release nucleic acids from biological samples, making the reagent effective at the earliest stage of extraction workflows.
Nucleases can degrade nucleic acids after a sample is collected or lysed, compromising the material needed for downstream analysis. Guanidine thiocyanate rapidly inactivates these enzymes while disrupting surrounding biological structures. This protection is especially relevant when workflows require intact RNA or DNA for gene expression studies, molecular diagnostics, or pathogen detection.
Guanidine thiocyanate supplies chaotropic denaturation and nuclease inactivation, while detergents contribute to membrane lysis. Alcohol-based binding conditions then support the association of released nucleic acids with a purification surface. Using these components together connects sample disruption with nucleic acid recovery, rather than treating lysis and purification as unrelated steps.
A typical workflow begins by exposing the biological sample to a lysis buffer containing guanidine thiocyanate, often with a detergent. Lysis releases nucleic acids and denatures proteins while nucleases are inactivated. Alcohol-based binding conditions then support capture on a silica membrane or magnetic particles, followed by purification of the retained genetic material.
After guanidine thiocyanate disrupts the sample, alcohol-based binding conditions help the released nucleic acids associate with either a silica membrane or magnetic particles. These surfaces provide a way to retain genetic material while other sample components are removed during purification. The choice of surface changes the handling format, but both support recovery of nucleic acids.
Its combination of membrane lysis, protein denaturation, and nuclease inactivation supports workflows that depend on preserved nucleic acids. Applications described for this reagent include molecular diagnostics, gene expression studies, pathogen detection, and other sample-processing procedures. In each setting, its value comes from helping release genetic material while limiting degradation before purification and analysis.