Sunset yellow FCF and protein clumping in lab tests at different pH levels
What it found
In lab tests, Sunset yellow FCF caused a model protein to clump together quickly under very acidic conditions.
This did not happen at a less acidic pH level.
What they found
Animal and lab studies
Stronger binding at low pH
Lab measurements showed the dye stuck to the protein much more strongly at pH 2.0 than at pH 6.0.
Protein clumping at pH 2.0
At pH 2.0, adding 0.05 to 3.0 mM of the dye made the protein clump together. No clumping happened at pH 6.0.
Fast clumping process
The clumping started right away without any delay when the dye was added to the protein in lab tests.
Loss of protein shape
At pH 6.0, the protein kept its normal shape when mixed with the dye. At pH 2.0, the protein lost nearly all its shape as more dye was added.
Depends on amount and pH
Lab data showed that how much the protein clumped depended on both the amount of protein present and the pH level.
What the authors conclude
- They highlight potential health risks linked to consuming Sunset yellow FCF based on these lab findings.
- They say their work gives insight into how the dye might affect human health.
- The authors call for more research in this area.
How it was done
Proteins clumping together is a concern in food science, and synthetic food dyes can contribute to this problem. The authors wanted to see how Sunset yellow FCF affects proteins.
Scientists tested the dye with trypsin, a model protein, in lab experiments. They used several techniques to look at how the dye and protein interacted at different pH levels. They tested dye amounts ranging from 0.05 to 3.0 mM.
What it can’t tell you
- We summarised it from the abstract only.
- These are lab tests using a single model protein, not studies in people or animals. They cannot show what happens to proteins in the human body after eating foods with this dye.
Who paid
- Conflicts
- Declaration of competing interest Author states that there is no conflict of interest.
- Authors work at
- King Saud University, Saudi Arabia
The paper
- Title
- Probing the interaction mechanisms between sunset yellow dye and trypsin protein leading to amorphous aggregation under low pH conditions
- Type
- Study
- Evidence
- Animals and lab studies
- Summarised from
- Abstract only
- Cite
- Al-Shabib NA, Khan JM, Malik A, et al (2024). Probing the interaction mechanisms between sunset yellow dye and trypsin protein leading to amorphous aggregation under low pH conditions. International journal of biological macromolecules. doi:10.1016/j.ijbiomac.2024.130442PubMed 38417745DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error