Clinical trial NCT04248374: Fatty Acid Taste Rating With or Without Sour Taste Adaptation
Official title: Fatty Acid Taste Rating With or Without Sour Taste Adaptation
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Taste, Altered
Lead sponsor: Purdue University
Sponsor class: OTHER
First posted: 2020-01-30
Enrollment: 38
Sex: ALL
Minimum age (years): 18
Maximum age (years): 65
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Intervention model description: Fatty Acid taste with and without sour adaptation
Primary purpose: BASIC_SCIENCE

Brief summary: We are trying to figure out whether the fatty acid taste is differentiated from sour taste.

Detailed description: Participants will be asked to provide general demographic information such as gender, age and ethnicity. Their height and weight will be measured. Then, they will be trained with one of the sample solutions for intensity rating and adaptation to sour taste. There will be eight different sample solutions containing sucrose esters, xanthan gums to help fatty acids stay dissolved, and either acetic acid for sour compounds or, butyric acid, caproic acid, caprylic acid, capric acid, lauric acid, oleic acid, or linoleic acid for fatty acid taste. 2 g of each palmitic acid and stearic acids in solid form (their melting points are above body temperature) will also be placed in participants' mouth. All of these compounds are common in the commercial food supply.

The study procedure entails two sets of taste intensity ratings without (Test A) or with (Test B) sour taste adaptation. For test A, participants will taste one of the eight solutions or one of solid fatty acids, and rate its intensity before and after expectorating it. They will not swallow any samples and they will rinse their tongues thoroughly with 1% ethanol solution and water after expectorating the solution. They will consume one piece of unsalted cracker and rinse their tongues thoroughly again. Before moving to the next step, they will be asked to describe the taste quality of the sample solution they just tasted. They will repeat this procedure with the rest of the sample solutions.

For test B, participants will follow the same procedure of taste intensity ratings but with sour taste adaptation. For sour taste adaptation, the participants will hold sour taste solutions in their mouth for 5 seconds and rate its taste intensity. They will repeat rating the sourness until they rate its intensity as less than weak. When they feel the sour taste solution weak, they will taste one of the eight solutions and repeat the intensity rating with one of the sample solutions. After the taste intensity rating, the participants will be asked to describe the taste quality of the sample solution they just tasted. They will repeat this procedure with the rest of the sample solutions.

The participants will do both test A and B twice in random order on two separate days. Taste testing is expected to take 1 hour each day. They will receive $20 at the end of the two test days as compensation for their participation.

Eligibility criteria: Inclusion Criteria:

-

Exclusion Criteria:

* taste disorder no allergy to alcohol

Primary outcomes:
measure: Taste Intensity
timeFrame: 4 hours
Secondary outcomes:
Other outcomes:
Locations:
city: West Lafayette
country: United States
facility: Purdue University
state: Indiana
Study officials:
affiliation: Purdue University
name: Richard D Mattes, PhD
role: PRINCIPAL_INVESTIGATOR
References: