Honey is among the most frequently adulterated foods in the EU import stream, and no single test settles the question.
Stable carbon isotope ratio analysis detects C4 sugars – cane and maize syrup – by distinguishing the photosynthetic pathway of the sugar source. It is blind to C3 syrups such as rice, beet and wheat, because C3 is also the pathway behind nectar. A clean isotope certificate on a rice-syrup-extended honey is a genuine certificate answering the wrong question.
Liquid chromatography for oligosaccharide markers looks for specific compounds associated with particular syrups. It only finds what is on the list, and syrup manufacture has evolved specifically to avoid the listed markers.
Nuclear magnetic resonance profiling compares a whole spectral fingerprint against a reference population and is currently the most informative single screen. Its weakness is structural: it can only flag deviation from what the database contains, so honeys from thinly represented origins or floral sources can read as anomalous for no better reason than under-representation.
Pollen analysis addresses botanical and broad geographic origin rather than syrup addition, and it is defeated by ultrafiltration – which is precisely why pollen-depleted honey is treated with suspicion.
The composition panel that most contracts specify is a quality and freshness panel. It catches crude adulteration and passes a well-made syrup addition, so passing it means a honey is not obviously fake rather than that it is authentic.
What works is a layered file: supplier due diligence first, checking that declared volume is plausible against declared hive counts; the full composition panel on every lot; broad-spectrum screening at a defined frequency weighted towards new suppliers and premium claims; targeted confirmatory testing when something is flagged; retained sealed samples from every lot; and sensory assessment at intake, which is free and catches more than buyers expect.