What Is WDPE and Why Does It Matter for Bioactive Honey?
WDPE stands for Water Dilution Peroxide Equivalent — the standard method for quantifying the hydrogen peroxide activity in honey. It measures how much H₂O₂ a honey generates when diluted, expressed as an equivalent concentration of hydrogen peroxide solution. For Jarrah honey, WDPE is one of the key measurements that distinguishes it from single-mechanism rivals like Manuka.
Key Points
- WDPE quantifies the hydrogen peroxide (H₂O₂) component of honey's antimicrobial activity
- Hydrogen peroxide in honey is generated enzymatically — not stored — when the honey is diluted
- Jarrah honey has both peroxide activity (PA) and non-peroxide activity (NPA); Manuka relies primarily on NPA
- WDPE is used alongside TA rating as part of Total Activity assessment in Forest Fresh's 5-lab testing programme
- Research by Guttentag et al. (2021) refined the methodology to make WDPE measurements more accurate and reproducible
There's a reason bioactive honey testing isn't simple: honey's antimicrobial properties come from more than one source, and not all of those sources are measured by any single test.
Manuka honey built its global reputation on MGO — methylglyoxal, a compound that is responsible for most of Manuka's non-peroxide antimicrobial activity. The MGO number on a Manuka jar tells you something real and important. But it tells you only half the story of what antimicrobial activity in honey can look like.
Jarrah honey is different. It works through two distinct mechanisms — and one of them, hydrogen peroxide activity, requires a specific measurement that MGO testing entirely misses. That measurement is WDPE.
The Rust-Proof Paint Analogy
Before diving into the science, here's an analogy that might help.
Imagine two different rust-proofing paints. Both are rated to "prevent rust for 10 years." But one works by forming a physical barrier that keeps water out, while the other works by releasing a trace chemical that actively neutralises the oxidation process. Same end result on the label. Completely different mechanisms.
If you're a car manufacturer trying to understand which paint to use in a coastal environment versus a dry climate, knowing the rating isn't enough — you need to know how the protection works.
WDPE is the test that reveals one of the two mechanisms in Jarrah honey: specifically, it tells you how much hydrogen peroxide activity is generated, and therefore how much of the honey's total antimicrobial performance comes from that pathway.
Where Honey's Hydrogen Peroxide Comes From
This is the part that surprises most people: honey doesn't contain stored hydrogen peroxide. If it did, it would be corrosive and completely unsuitable as a food.
Instead, Jarrah honey contains an enzyme called glucose oxidase. This enzyme is produced by the bee and deposited into nectar during the collection and processing stage. Glucose oxidase is largely inactive in concentrated honey — the low water activity of honey keeps it dormant.
When the honey is diluted — for example, when it contacts the moisture of a wound surface, is added to a warm liquid, or is dissolved in saliva — glucose oxidase becomes active. It catalyses the following reaction:
Glucose + O₂ + H₂O → Gluconolactone + H₂O₂
The hydrogen peroxide produced is antimicrobial. It's also produced gradually and at low concentrations — enough to have a biological effect without causing the tissue damage that would occur if you applied a 3% H₂O₂ wound wash directly.
This slow, dilution-triggered release of hydrogen peroxide is one of the reasons that the phrase "dilution-activated" appears in bioactive honey research. The activity is not present in the jar — it is activated by use.
How WDPE Is Measured
Measuring WDPE accurately is more technically demanding than measuring MGO, which is a stable compound that can be quantified in a straightforward chemical assay.
Hydrogen peroxide is inherently unstable. It's also present in many honeys at low concentrations — and it can be destroyed by catalase, another enzyme, before it can be properly measured. Catalase activity in honey varies by botanical source, and some honeys (including Manuka) contain relatively high catalase levels that suppress measurable peroxide activity, which is partly why Manuka's antimicrobial profile is so heavily NPA-dominated.
The standard WDPE method involves: 1. Diluting honey to a defined water activity level 2. Incubating the diluted sample for a standardised period to allow glucose oxidase activity 3. Measuring the H₂O₂ produced using a colorimetric assay 4. Expressing the result as a percentage concentration of H₂O₂ equivalent
Research by Guttentag et al. (2021) identified significant methodological inconsistencies in earlier WDPE protocols — specifically around incubation conditions, sample preparation, and catalase interference — and proposed standardised procedures to improve reproducibility across laboratories. Forest Fresh Honey's WDPE testing uses updated protocols consistent with this methodological improvement, ensuring results are accurate and comparable with published research.
WDPE in the Context of Total Activity
TA (Total Activity) is the headline number on every Forest Fresh Honey jar. Understanding what WDPE contributes to that number is important.
Total Activity measures the combined antimicrobial effect of all mechanisms in the honey — both peroxide activity (PA) and non-peroxide activity (NPA). WDPE specifically quantifies the peroxide activity component.
For Jarrah honey, the breakdown typically shows significant contributions from both PA and NPA. This dual mechanism is a key differentiator from Manuka, which achieves its TA equivalent primarily through NPA from methylglyoxal.
| Property | Jarrah Honey | Manuka Honey |
|---|---|---|
| Peroxide Activity (PA) | High — significant WDPE | Low — catalase suppresses |
| Non-Peroxide Activity (NPA) | Present | Primary mechanism (MGO) |
| Total Activity basis | Dual mechanism | Single mechanism |
| Testing required | TA + WDPE + NPA | MGO or UMF |
This is why TA50+ for Jarrah honey (equivalent to MGO 4000+) represents a genuinely comprehensive antimicrobial profile — the TA number reflects two independent pathways, not one.
🍯 Jarrah Platinum TA50+ — dual-mechanism bioactive honey, independently WDPE-tested Shop Jarrah Platinum TA50+ →
Why WDPE Matters to You
For most people buying Jarrah honey for wellness purposes, WDPE matters for one practical reason: it tells you that the honey's activity is genuine and multifaceted.
A honey that achieves a high TA rating entirely through NPA has a different profile from one that achieves the same TA through dual mechanism. Neither is automatically "better" for all applications — but understanding which mechanism dominates helps you choose with more information.
For Forest Fresh Honey, the WDPE result forms part of every Certificate of Analysis. It's one of five independent tests conducted on every batch. You can request the COA for your specific jar and see the WDPE result alongside the TA rating, Jarrah Factor™ composite, pollen authentication, and food safety panel.
Read: How We Test Our Honey — the full 5-lab testing process →
Frequently Asked Questions
Q: What does WDPE stand for? A: Water Dilution Peroxide Equivalent. It is the standard method for measuring hydrogen peroxide activity in honey, expressed as the equivalent concentration of H₂O₂ that the diluted honey produces.
Q: Is hydrogen peroxide in honey the same as the peroxide you buy at the pharmacy? A: Not quite. The hydrogen peroxide in honey is generated enzymatically at very low concentrations when the honey is diluted — it doesn't exist in the jar in concentrated form. Pharmacy H₂O₂ is typically 3% and above; the concentrations generated by honey are in the low micromolar range, sufficient for biological activity without the tissue damage of concentrated H₂O₂.
Q: Does all honey have WDPE activity? A: Most floral honeys have some glucose oxidase activity and therefore some capacity to generate H₂O₂ on dilution. The degree varies considerably by botanical source, processing, and storage conditions. Jarrah honey has notably high WDPE compared to most commercial honeys. Manuka honey has low WDPE because its catalase content suppresses peroxide activity — which is why its antimicrobial activity is dominated by MGO.
Q: Why is WDPE testing more complex than MGO testing? A: MGO is a stable compound that can be measured directly in honey. H₂O₂ is unstable and generated only on dilution, so WDPE measurement requires careful incubation protocols, standardised dilution conditions, and control of catalase interference. Guttentag et al. (2021) significantly improved the reproducibility of these protocols.
Q: Does heat destroy WDPE activity? A: Yes. High temperatures deactivate glucose oxidase — the enzyme responsible for H₂O₂ generation. This is one reason Forest Fresh Honey products are not heat-processed (pasteurised). Our honey is raw and pure to preserve enzymatic activity, including the glucose oxidase that underpins WDPE.
Q: Is WDPE the same as Total Activity? A: No. WDPE is one component of Total Activity — specifically, it measures the peroxide activity (PA) contribution. TA is the combined result of both PA and NPA. WDPE must be measured separately to understand how much of a honey's TA comes from hydrogen peroxide activity versus non-peroxide activity.
The information in this article is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease or health condition. Please consult your healthcare professional before using honey as part of a health or medical regimen. Forest Fresh Honey products are food products, not medicines. Not suitable for children under 12 months. These statements are based on traditional use and emerging scientific research.
Written by Matt Fewster, 5th generation of the Fewster family and co-founder of Forest Fresh Honey.
Sources: - Guttentag, A., Koldovsky, D., & Krovetz, H. (2021). Hydrogen peroxide measurement methodology in honey — standardisation advances. Available via PubMed. - Irish, J., Blair, S., & Carter, D.A. (2011). Antibacterial activity of honey derived from Australian flora. PLOS ONE. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0018229 - Hossain, M.L. & Locher, C. (2023). WA honey antibacterial and antioxidant activity. Applied Sciences, 13(13), 7440. https://www.mdpi.com/2076-3417/13/13/7440 - Manning, R. (2011). Antibacterial activity of WA honeys. WA DPIRD. https://library.dpird.wa.gov.au/pubns/39/