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Related Concept Videos

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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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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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,...
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G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
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Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

2.3K
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
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¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

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Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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Related Experiment Video

Updated: Oct 12, 2025

Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds
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Quantitative Proton NMR Spectroscopy for Basic Taste Recombinant Reconstitution Using the Taste Recombinant Database.

Richard Hammerl1, Oliver Frank1, Thomas Hofmann1

  • 1Chair of Food Chemistry and Molecular Sensory Science, Technische Universität München, Lise-Meitner-Strasse 34, D-85354 Freising-Weihenstephan, Germany.

Journal of Agricultural and Food Chemistry
|November 24, 2021
PubMed
Summary

This study introduces a fast quantitative 1H NMR method for analyzing taste compounds in foods. This novel approach decodes food sensometabolomes, identifying key taste molecules more efficiently than traditional methods.

Keywords:
ERETIC 2apple juicebalsamic vinegarbasic taste recombinantgolden chanterellesprocess flavorqHNMRsensory analysisshrimptaste profile

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Taste Exam: A Brief and Validated Test
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Area of Science:

  • Food science
  • Analytical chemistry
  • Sensory science

Background:

  • Decoding the non-volatile sensometabolome of foods is crucial for understanding taste perception.
  • Traditional methods like LC-MS/MS and HPLC-UV/Vis for taste compound analysis are often laborious and time-consuming.

Purpose of the Study:

  • To develop a novel, rapid quantitative 1H NMR approach for reconstituting and analyzing basic taste recombinants.
  • To enable fast and direct reconstitution and taste profile analysis of food sensometabolomes.

Main Methods:

  • Utilized quantitative 1H NMR (qHNMR) for compound identification and absolute quantitation.
  • Applied qHNMR to reconstitute basic taste recombinants from various food matrices.
  • Determined limit of detection (LoD) values for proton signals to assess sensitivity.

Main Results:

  • Successfully reconstituted basic taste recombinants from apple juice, balsamic vinegar, golden chanterelles, process flavor, and shrimp.
  • Taste profile analysis via qHNMR was completed in under 15 minutes.
  • Results from qHNMR analysis were identical to those obtained by LC-MS/MS and HPLC-UV/Vis, confirming accuracy.
  • Demonstrated that the method can detect taste-active compounds well below their recognition thresholds.

Conclusions:

  • The developed qHNMR approach offers a fast, direct, and accurate method for decoding food sensometabolomes.
  • This technique significantly reduces the time required for taste compound analysis compared to conventional methods.
  • The high sensitivity of the qHNMR method allows for the detection of taste compounds even at concentrations below their sensory perception thresholds.