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Physical Properties of Amines01:26

Physical Properties of Amines

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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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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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Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
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Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
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Amino Acid Biosynthetic Pathways01:29

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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Metabolic Interaction between Ammonia and Baicalein.

Shuwei Zhang1, Ronghui Wang1, Yantao Zhao1

  • 1Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, North Carolina 28081, United States.

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The flavonoid baicalein effectively traps ammonia in vitro and in vivo, forming aminated products. This suggests baicalein

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Pharmacology

Background:

  • Ammonia, a cellular metabolism waste product, can cause neurological damage at high concentrations.
  • High ammonia levels are linked to neurotransmission alteration, oxidative stress, and brain swelling.
  • Flavonoids are investigated for their potential therapeutic properties.

Purpose of the Study:

  • To investigate the capacity of the bioactive polyphenol baicalein to trap ammonia.
  • To determine if baicalein can detoxify ammonia both in vitro and in vivo.

Main Methods:

  • In vitro reactions of baicalein with ammonia.
  • Structural characterization of aminated products using HR-MS and NMR.
  • In vivo studies in mice involving oral administration of baicalein.
  • Analysis of baicalein and its metabolites in fecal, urine, plasma, and brain samples.

Main Results:

  • Baicalein reacted with ammonia in vitro to form 5-NH2-baicalein, 6-NH2-baicalein, and 5,6-di-NH2-baicalein.
  • These aminated products were identified and structurally confirmed.
  • In mice, 6-NH2-baicalein was detected in feces, urine, plasma, and brain tissue.
  • Significant levels of 6-NH2-baicalein were found in the brain, close to baicalein levels, suggesting blood-brain barrier penetration.

Conclusions:

  • Baicalein demonstrates a capacity to trap and detoxify ammonia.
  • The formation of aminated metabolites like 6-NH2-baicalein indicates a detoxification mechanism.
  • Baicalein shows potential for treating ammonia-associated chronic diseases due to its ammonia-scavenging ability.