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Related Concept Videos

The Physiology of Taste01:24

The Physiology of Taste

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Amino acids03:42

Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible...
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Gustation01:43

Gustation

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Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
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Taste Buds and Receptors01:20

Taste Buds and Receptors

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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
1.9K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

5.7K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Updated: Jun 11, 2025

Taste Exam: A Brief and Validated Test
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Amino Acid Bitterness: Characterization and Suppression.

Caroline Payton Harmon1, Osama M Ahmed2,3, Paul A S Breslin1,3

  • 1Rutgers University, New Brunswick, New Jersey 08901, United States.

Journal of Agricultural and Food Chemistry
|October 1, 2024
PubMed
Summary
This summary is machine-generated.

Essential amino acids are the most bitter, but sodium salts can significantly reduce this taste. This finding may improve compliance with amino acid supplements for patients.

Keywords:
TAS2Rshealthinhibitionmodulationnutritionreceptorssaltssodiumsupplementationtaste

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Area of Science:

  • Nutritional Science
  • Sensory Science
  • Human Physiology

Background:

  • Amino acids are essential nutrients, often consumed as proteins or peptides.
  • Free amino acids can elicit a bitter taste, hindering patient adherence to supplements.
  • Understanding amino acid bitterness is crucial for improving nutritional product palatability.

Purpose of the Study:

  • To identify the most bitter amino acids and their concentration-intensity functions.
  • To investigate individual differences in bitterness perception.
  • To explore the bitterness-suppressing effects of sodium salts on amino acids.

Main Methods:

  • Characterization of bitterness intensity for various amino acids.
  • Analysis of concentration-intensity functions.
  • Clustering and correlation of individual differences in perception.
  • Assessment of bitterness suppression by sodium salts.

Main Results:

  • Essential amino acids were identified as the most bitter stimuli.
  • Four distinct groupings of amino acids based on bitterness perception were observed.
  • Sodium salts effectively suppressed the bitterness of 5 out of 6 highly bitter amino acids.
  • Evidence suggests overlapping TAS2R activation within amino acid clusters.

Conclusions:

  • Essential amino acids contribute significantly to bitterness in supplements.
  • Sodium salt addition offers a viable strategy to mitigate amino acid bitterness.
  • These findings can enhance the palatability and compliance of amino acid-based nutritional formulas.