Melting Curve Analysis
Melting Curve Analysis - Related Videos
06:30
Rapid and Efficient Zebrafish Genotyping Using PCR with High-resolution Melt Analysis
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Cited by 34 •
2014
PCR combined with high-resolution melt analysis (HRMA) is demonstrated as a rapid and efficient method to genotype zebrafish.
05:12
Melting Point
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2023
Source: Vy M. Dong and Jan Riedel, Department of Chemistry, University of California, Irvine, CA One of the most important properties of a crystalline solid is its melting point. It can be used to determine the purity of a known compound and gives important information about the stability of the formed crystals.
05:12
Melting Points - Concepts
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2020
Melting Points in Organic Chemistry The melting point of a compound is the temperature at which the solid phase transitions into the liquid phase at a standard pressure of 1 atmosphere. The melting point of a compound is a physical property, like solubility, density, color, and electronegativity that can be used to identify a compound. Determining the exact temperature at which a compound begins to melt is a challenging task; because of this, the melting point of compounds is reported as a...
08:15
Melting Points - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Determining the Melting Points of Naphthalene, Urea, and an Unknown MixtureExpand In this experiment, you will measure the melting point range of two known substances, naphthalene and urea, by observing the melting phenomenon during heating. You'll then analyze a mixture of urea and an unknown substance to observe how the unknown impurity affects the melting point range. Put on a lab coat,...
02:27
Melting Points - Instructor Prep
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2020
Source: Lara Al Hariri at the University of Massachusetts Amherst, MA, USA Preparation of the LaboratoryExpand 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. Prepare a mixture of urea and benzoic acid in a mass ratio of 4 to 1. Tare a weighing boat and...
FAQs
Melting temperature varies with the DNA sequence, molecule length, and strength of complementary pairing. These features determine how readily the double-stranded product separates as temperature rises. Consequently, products with different sequences or lengths can generate distinct temperature profiles, allowing researchers to compare amplified DNA and recognize differences that may not be apparent from amplification alone.
A mismatch disrupts complete complementary pairing between DNA strands, which can alter the temperature at which the molecules separate. The resulting change in the fluorescence-versus-temperature profile may distinguish closely related sequences. This principle makes the analysis useful for detecting sequence variation, including differences relevant to genotyping and mutation screening, without requiring sequencing.
Fluorescent dyes or probes provide the signal used to follow the double-stranded DNA product during heating. As the DNA separates, the associated fluorescence changes, creating a measurable relationship between fluorescence and temperature. Researchers can examine this profile and identify the melting-temperature peak rather than relying only on the amount of amplified DNA.
Melting Curve Analysis can distinguish closely related DNA sequences by comparing their melting behavior, whereas sequencing directly determines nucleotide order. The curve-based approach therefore supports rapid analytical checks and selected genotyping or mutation-screening applications without sequencing. It provides evidence of sequence-related differences, but its value lies in profile comparison rather than a complete sequence readout.
After real-time PCR produces the double-stranded DNA target, the sample is subjected to increasing temperature while fluorescence is monitored. The resulting fluorescence-versus-temperature profile is examined for its melting-temperature peak. This workflow links the amplified product to a characteristic denaturation signal and enables researchers to evaluate the product before using the result for downstream interpretation.
The melting profile provides an additional check on the identity and consistency of amplified DNA. Researchers compare the observed peak with the expected melting behavior of the target product; a difference can indicate that the amplified material is not identical in sequence or length. Thus, the method functions as a rapid quality-control step within real-time PCR analysis.
The technique is useful when a sequence difference changes DNA pairing enough to produce a distinguishable melting profile. Researchers can compare profiles from samples to support genotyping or mutation screening, particularly when they need a rapid analytical result without sequencing. Its application depends on interpreting sequence-related shifts in melting behavior rather than directly reading the nucleotide sequence.