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Production of Organic Acids01:25

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Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
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Aldehydes are more reactive than carboxylic acids and hence, can get over-reduced to alcohol in the presence of strong reducing agents. Therefore, carboxylic acids are inefficient in preparing aldehydes using LAH.
Carboxylic acid derivatives like acid chlorides and esters are more easily reducible than the corresponding acids. The derivatives reduce in the presence of mild reducing agents to give aldehydes. Aldehydes can also be prepared by Rosenmund reduction, that is, the reduction of...
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Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
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Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation01:22

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Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
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Aldehydes and ketones are prepared from alcohols, alkenes, and alkynes via different reaction pathways. Alcohols are the most commonly used substrates for synthesizing aldehydes and ketones. The conversion of alcohol to aldehyde, which involves the oxidation process, depends on the class of the alcohol used and the strength of the oxidizing agent. For instance, primary alcohol will form an aldehyde when treated with a weak oxidizing agent; however, it gets over-oxidized to a carboxylic acid in...
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Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
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Updated: Apr 18, 2026

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
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Microbial engineering for aldehyde synthesis.

Aditya M Kunjapur1, Kristala L J Prather2

  • 1Department of Chemical Engineering, Synthetic Biology Engineering Research Center (SynBERC), Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

Applied and Environmental Microbiology
|January 11, 2015
PubMed
Summary
This summary is machine-generated.

Microbial engineering enables the synthesis of valuable aldehydes, overcoming challenges like rapid conversion to alcohols. Aldehyde toxicity remains a key hurdle for achieving high yields in microorganisms.

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Area of Science:

  • Biotechnology
  • Synthetic Biology
  • Biochemistry

Background:

  • Aldehydes have diverse industrial applications and contribute to natural flavors/fragrances.
  • Microbial production offers an alternative to plant extraction or chemical synthesis.
  • Aldehydes are often rapidly converted to alcohols by microorganisms.

Purpose of the Study:

  • To review microbial engineering strategies for aldehyde synthesis.
  • To highlight advancements in achieving aldehyde accumulation in Escherichia coli.
  • To discuss the persistent challenge of aldehyde toxicity.

Main Methods:

  • Detailed characterization of aldehyde biosynthetic enzymes.
  • Metabolic engineering of model microbes like Escherichia coli.
  • Strategies to minimize endogenous aldehyde-to-alcohol conversion.

Main Results:

  • Established foundation for microbial aldehyde synthesis.
  • Engineered Escherichia coli strains for improved aldehyde accumulation.
  • Identified aldehyde toxicity as a limiting factor for titers.

Conclusions:

  • Microbial engineering is advancing aldehyde production.
  • Overcoming aldehyde toxicity is crucial for commercial viability.
  • Further research is needed for broader utilization of aldehydes.