Detection of Inosine Monophosphate and the Umami Synergistic Effect Using a Taste Sensor with a Surface-Modified...

Area of Science:

• Chemical Sensors
• Food Science
• Analytical Chemistry

Background:

• A lipid/polymer taste sensor using tetradodecylammonium bromide (TDAB) and 2,6-dihydroxyterephthalic acid (2,6-DHTPA) shows high sensitivity to monosodium L-glutamate (MSG).
• Umami taste is crucial in food, and understanding synergistic effects between umami substances like MSG and inosine monophosphate (IMP) is important for flavor enhancement.

Purpose of the Study:

• To determine if the TDAB/2,6-DHTPA taste sensor can detect inosine monophosphate (IMP).
• To investigate the sensor's ability to evaluate the umami synergistic effect between IMP and MSG.
• To elucidate the interaction mechanisms using 1H-NMR analysis.

Main Methods:

• Fabrication and testing of a lipid/polymer taste sensor modified with 2,6-dihydroxyterephthalic acid (2,6-DHTPA).
• Detection of IMP and evaluation of responses to mixtures of MSG and IMP.
• 1H-NMR spectroscopy to analyze interactions between the sensor membrane modifier and umami substances.

Main Results:

• The taste sensor successfully detected IMP, with sensitivity influenced by hydrogen bonding within the modifier and between the modifier and umami substances.
• The sensor response to MSG and IMP mixtures exceeded the sum of individual responses, confirming the evaluation of the umami synergistic effect.
• NMR data indicated that the membrane modifier enhances interactions between IMP and MSG, supporting the observed synergistic effect.

Conclusions:

• The developed taste sensor is effective for detecting IMP and quantifying the synergistic umami effect between MSG and IMP.
• Hydrogen bonding plays a critical role in the sensor's sensitivity and selectivity towards umami substances.
• This sensor technology offers potential for evaluating complex flavor interactions in food systems.