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There are various methods for the preparation of carboxylic acids. For example, oxidation of primary alcohols or aldehydes using strong oxidizing agents results in a carboxylic acid.  Aldehydes can also be oxidized in the presence of mild oxidizing agents.
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Although it is possible to reduce a carboxylic acid to an aldehyde, strong reducing agents, like lithium aluminum hydride (LAH), prohibit a controlled reduction, instead causing the generated aldehyde to instantly over-reduce to a primary alcohol.
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Preparation of Epoxides03:00

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Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
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Preparation of Nitriles01:12

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One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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One of the methods for preparing symmetrical or unsymmetrical acid anhydrides involves the treatment of acid chlorides with the sodium salt of carboxylic acids. The reaction proceeds via a nucleophilic acyl substitution.
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Preparation of Amides01:29

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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
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Preparation of High-Quality Fermented Fish Product
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Preparation of

Yuqin Wang1,2, Pingping Fan1,2, Shanyu Zhang1,2

  • 1State Key Laboratory of Analytical Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.

Biophysics Reports
|June 8, 2023
PubMed
Summary
This summary is machine-generated.

We present a simplified protocol for preparing Mycobacterium smegmatis porin A (MspA) nanopores, crucial for nanopore sequencing and nano-reactive sensing. This method yields high-quality MspA protein for single-molecule sensing applications.

Keywords:
Affinity purificationMspA nanoporeProkaryotic expressionSingle molecule sensing

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Mycobacterium smegmatis porin A (MspA) offers high spatial resolution for sensing due to its narrow constriction.
  • MspA is ideal for nanopore sequencing and nano-reactive sensing but is not commercially available.
  • Existing MspA preparation methods are complex and inaccessible.

Purpose of the Study:

  • To develop a simplified and accessible protocol for MspA preparation.
  • To demonstrate the utility of prepared MspA nanopores for single-molecule sensing.
  • To enable the development of MspA-based nano-reactive sensors.

Main Methods:

  • A straightforward protocol for MspA protein preparation was developed.
  • The protocol focuses on achieving high yields of fully oligomerized MspA protein.
  • Demonstration of MspA nanopore function using immobilized ssDNA oligonucleotide discrimination.

Main Results:

  • The protocol yields approximately 10 mg of fully oligomerized MspA protein per liter of culture.
  • The prepared MspA nanopores successfully discriminated immobilized ssDNA oligonucleotides.
  • The protocol is compatible with MspA mutants, facilitating sensor development.

Conclusions:

  • A simplified MspA preparation protocol is established, overcoming commercial unavailability.
  • The protocol provides a reliable source of MspA for nanopore sequencing and nano-reactive sensing.
  • This work facilitates the creation of diverse MspA-based nano-sensors for various applications.