A novel objective sour taste evaluation method based on near-infrared spectroscopy

Area of Science:

• Food Science
• Sensory Science
• Biomedical Engineering

Background:

• Accurate taste evaluation is crucial for food and drink development.
• Current sensory evaluation systems are subjective due to individual differences.
• Objective methods are needed to precisely estimate taste properties.

Purpose of the Study:

• To introduce salivary hemodynamic signals measured by near-infrared spectroscopy (NIRS) as an objective indicator for taste evaluation.
• To investigate the correlation between parotid gland hemodynamic responses and salivary secretion.
• To demonstrate NIRS's ability to detect complex taste phenomena like the masking effect.

Main Methods:

• Utilized near-infrared spectroscopy (NIRS) to measure salivary hemodynamic signals.
• Analyzed hemodynamic responses of the parotid gland to basic and complex taste stimuli.
• Correlated hemodynamic responses with salivary secretion volume.

Main Results:

• Salivary hemodynamic signals measured by NIRS serve as a reliable objective indicator for sour taste stimulus.
• Parotid gland hemodynamic responses correlate with salivary secretion volume and are independent of hedonic aspects.
• NIRS successfully detected the taste masking effect in complex food-based solutions.

Conclusions:

• Near-infrared spectroscopy offers a novel, objective tool for evaluating taste properties in foods and drinks.
• NIRS can quantify complex taste interactions, such as the masking effect.
• This technology provides a more precise alternative to subjective sensory evaluations.