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The “Manuka number” of honey is often associated with the grading system used to measure the antibacterial potency and quality of Manuka honey, a type of honey produced primarily in New Zealand and Australia from the nectar of the **Manuka tree** (*Leptospermum scoparium*).
Key Points About Manuka Honey Ratings:
1. **Unique Manuka Factor (UMF)**: The **UMF** is one of the most recognized grading systems for Manuka honey. It measures the levels of key natural markers found in Manuka honey that indicate its potency, purity, and quality.
The UMF rating is based on three key compounds:
– Methylglyoxal (MGO): The primary antibacterial compound.
– Leptosperin: A chemical marker unique to Manuka nectar.
– Dihydroxyacetone (DHA): A precursor to MGO found in the nectar of Manuka flowers.
The UMF number (e.g., UMF 5+, UMF 10+, UMF 15+, UMF 20+, etc.) reflects the concentration of these compounds, particularly MGO. The higher the number, the more potent the honey’s antibacterial properties.
2. **Methylglyoxal (MGO) Rating**: Some Manuka honey producers use the **MGO rating system** directly, which indicates the concentration of methylglyoxal in mg/kg. For example:
– MGO 100+ (mild antibacterial potency)
– MGO 250+ (moderate potency)
– MGO 400+ (high potency)
– MGO 550+ (very high potency)
The MGO number can be converted roughly to the UMF number, where MGO 83+ is approximately UMF 5+, MGO 263+ is about UMF 10+, and so on.
3. **KFactor, Bio Active, and Other Ratings**: Other companies have their proprietary grading systems:
– **KFactor** (used by Wedderspoon): This system measures the pollen count and purity of Manuka honey.
– **Bio Active**: An older and less accurate grading term previously used to indicate the general antibacterial activity, but it is not widely accepted or used today.
Conclusion:
The “Manuka number” typically refers to either the UMF or MGO rating of Manuka honey. Both systems aim to provide consumers with an idea of the honey’s antibacterial strength, purity, and therapeutic benefits. Higher numbers indicate a higher concentration of active compounds, which often correlates with a higher price and stronger potential health benefits.
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