Agar gel strength, fat and flavour release in the mouth
What it found
In people tasting agar gels, stronger gels needed more chewing and gave off less aroma, while added fat meant less chewing and changed aroma release depending on the aroma.
The same pattern showed up in lab tests.
What they found
Studies in people
Stronger gels, more chewing
As the agar gel strength went up, tasters had to work harder to break the gel down in their mouths.
Weaker flavour in strong gels
The stronger the gel, the lower the intensity of flavour-related sensations the trained panel reported.
Fat means less chewing
Adding fat to the gels reduced how much oral processing the tasters needed.
Studies in people and animals
Less aroma from strong gels
Aroma release went down as gel strength went up, both in the mouth and in lab tests. The authors say physical and chemical effects, not biology, explain the sensory changes.
Fat changes aroma release
Fat had different effects on aroma release depending on how well each aroma compound dissolves in fat.
What the authors conclude
“Volatile release was inversely related to gel strength, showing that physicochemical phenomena were the main mechanisms underlying the perceived sensory changes.”
Also in their conclusions
- They conclude that physical and chemical phenomena were the main mechanisms behind the sensory changes seen.
- They report that fat's effect on aroma release depended on the fat solubility of each volatile.
How it was done
The authors wanted to understand how the density and make-up of a food affect how it breaks down in the mouth, how flavour is released and what the eater senses.
A trained panel tasted agar gels at four strengths (1.0, 1.7, 2.9 and 5% agarose), each with 0, 2, 5 or 10% added fat, spiked with seven aroma compounds. They measured chewing and sensory intensity over time, and measured aroma release both in the mouth and in lab tests.
What it can’t tell you
- We summarised it from the abstract only.
- The panel was trained to rate these specific agar gels, so the results may not carry over to other foods or untrained eaters.
- The study measured aroma release and sensory ratings, not health effects.
The paper
- Title
- Effects of Agar Gel Strength and Fat on Oral Breakdown, Volatile Release, and Sensory Perception Using in Vivo and in Vitro Systems
- Type
- Study
- Evidence
- Studies in people · animals · lab
- Summarised from
- Abstract only
- Cite
- Frank D, Eyres GT, Piyasiri U, et al (2015). Effects of Agar Gel Strength and Fat on Oral Breakdown, Volatile Release, and Sensory Perception Using in Vivo and in Vitro Systems. Journal of agricultural and food chemistry. doi:10.1021/acs.jafc.5b03441PubMed 26435196DOI
Summary written 26 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error