Amine Modified Probes
Amine Modified Probes - Related Videos
01:19
Amines to Amides: Acylation of Amines
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2025
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond. Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
01:30
Preparation of Amines: Alkylation of Ammonia and Amines
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2025
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation. Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
01:38
Preparation of Amines: Reductive Amination of Aldehydes and Ketones
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2023
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate. Reductive amination using sodium cyanoborohydride as the reducing agent is called the Borch reaction. Sodium cyanoborohydride is a mild...
01:07
Amines: Introduction
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2023
Amines are organic derivatives of ammonia. They are formed by replacing one or more ammonia protons with alkyl or aryl groups. Depending upon the number of organyl groups bonded to nitrogen, amines are classified as primary, secondary, or tertiary. Primary amines have one organyl group attached to the nitrogen atom, while secondary and tertiary amines have two and three organyl groups attached to the nitrogen atom, respectively. When a fourth organyl group is present, the nitrogen possesses a...
01:19
Structure of Amines
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2023
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
FAQs
Placement at a defined position gives the probe’s reactive handle a controlled location rather than leaving attachment chemistry unspecified. During synthesis, the primary amine is introduced where coupling is intended, allowing the resulting DNA or RNA probe to be linked to a surface, linker, or reporter in a more controlled arrangement. This supports consistent downstream hybridization measurements.
The primary amine serves as the chemical point of connection in the coupling step. It reacts with an activated chemical group on a substrate, linker, or detectable reporter, producing a stable covalent bond. Because the probe remains chemically attached after this reaction, its nucleic-acid sequence can be retained for surface-based hybridization or connected to a detection signal.
Orientation and retention influence how effectively a probe can participate in hybridization assays. Controlled attachment helps keep DNA or RNA associated with the measurement surface and improves the arrangement of the probe for interaction with complementary nucleic acid sequences. Consequently, this design is useful when researchers need surface-bound probes to support detection in arrays or biosensors.
Amine modified probes can be coupled to detectable reporter molecules, including labels used for fluorescence-based detection, either through the probe’s reactive chemistry or a linker. The probe then combines sequence complementarity with a measurable signal: hybridization identifies matching nucleic acid sequences, while the attached reporter supports their detection. This connects chemical conjugation with fluorescence-based biological assays.
A typical workflow begins by synthesizing the DNA or RNA probe with the amine at a chosen position. The modified probe is then exposed to an activated group on a substrate, linker, or reporter so covalent coupling can occur. After attachment or labeling, the probe is used to measure complementary sequences through a hybridization-based assay.
These probes are relevant when an experiment requires nucleic-acid capture or detection in an organized format. Supported uses include immobilized-probe hybridization assays, microarrays, biosensors, and fluorescence-based detection. In biology, the resulting measurements can contribute to gene expression analysis, pathogen detection, and molecular diagnostics, extending the same coupling strategy across research and diagnostic contexts.