Carob Honey Tops Six Eastern Moroccan Varieties in Antioxidant Tests

• Among seven types of honey from eastern Morocco, Carob honey (Ceratonia siliqua) had the highest measured levels of polyphenols, flavonoids, protein, and antioxidant activity
• Computer docking simulations found that several honey aroma compounds, including ethyl phenylacetate and thymol, bound more tightly to an antioxidant related enzyme called cytochrome c peroxidase than vitamin C did in the model
• All 35 honey samples tested met European Commission quality standards for moisture, acidity, and freshness markers
• Higher polyphenol and flavonoid content tracked closely with higher measured antioxidant activity across the honeys
• Thyme honey contained the highest concentration of thymol of any variety tested, yet showed some of the lowest measured antioxidant activity overall, suggesting no single compound accounts for honey's antioxidant profile

Vitamin C is usually the yardstick other antioxidants get measured against. In a new computer modeling study, several molecules naturally found in honey did something unexpected: in a simulated binding pocket, they held onto their target protein more tightly than vitamin C itself.

Researchers analyzing honey from eastern Morocco ran molecular docking simulations pairing several honey aroma compounds against cytochrome c peroxidase, an enzyme often used as a model target for antioxidant research. Compounds including ethyl phenylacetate, thymol, phenylacetic acid, phenylacetaldehyde, and benzaldehyde all scored stronger simulated binding affinities than vitamin C, according to this preliminary computational analysis. The same study also measured the actual chemical makeup of seven honey types collected directly from beekeepers, finding that Carob honey stood out with the highest polyphenol content, flavonoid content, protein level, and antioxidant activity of the group.

To reach these results, the team collected 35 honey samples across two harvest seasons and tested standard quality markers such as moisture, pH, and protein, alongside total polyphenol and flavonoid concentrations and antioxidant activity measured through the DPPH assay, a common laboratory test that tracks how much a substance neutralizes free radicals. Separately, using gas chromatography and mass spectrometry data on each honey's aroma compounds, they selected the most abundant molecules and ran them through docking software against the target enzyme, then followed up with quantum chemistry calculations, called density functional theory, to check how electronically stable each compound was.

Honey's reputation as a source of antioxidants has largely rested on tradition and a handful of standard chemical tests. This study adds a molecular layer to that picture, proposing specific compounds, drawn from honey's own aroma chemistry, that might help explain measured antioxidant effects at a more mechanistic level. It also lines up with something beekeepers and honey buyers have long noticed: darker, more robustly flavored honeys like Carob tend to carry a heavier load of the phenolic compounds linked to antioxidant capacity.

The docking and DFT results describe how molecules might behave inside a simulated binding site, not how they behave in a living body, so they should not be read as evidence of a therapeutic effect. And thymol's strong simulation score did not carry over to the honey it is most concentrated in. Thyme honey showed some of the lowest measured antioxidant activity among the seven types tested, a reminder that one promising compound does not automatically make for a more powerful honey overall.

Tayab sources its honey from a network of beekeepers across Morocco, including the same Carob variety examined here, and findings like these are part of why the brand treats laboratory testing, rather than reputation alone, as central to understanding what is actually in a jar of honey.