Manuka Honey: MGO Ratings & the New Zealand Government’s Science Definition
Every jar of TranzAlpine Manuka honey is labelled with numbers which show the strength of its MG content and confirm it is genuine Manuka Honey.
Want to know exactly what it all means? We asked the experts to explain what the numbers stand for and why they are on the label.
The large number on the front of every jar of TranzAlpine Manuka honey is its MG rating – which shows the strength of the honey’s antimicrobial activity.
MG is short for methylglyoxal, the naturally-occurring chemical unique to honey made from nectar gathered from the Mānuka bush. Scientific tests have shown this chemical has antimicrobial properties and the more the honey contains, the greater its bug-fighting power.
The MG scale starts around 50 and goes right up to 650. As a general rule, honey with an MG rating between 50 and 100 is ideal for daily use, while honey with an MG rating of between 100 and 250 is better for an extra boost, and anything above 250 is a maximum strength product best for occasional use when you really need it.
“We test all our honey to establish its MG level inn an independent laboratory when it extracted, which means we can guarantee the MG rating stated on the label is correct and true to label.”
New Zealand Manuka Honey Science Definition
Each jar of TranzAlpine Manuka honey meets the strict definition of Manuka Honey set by the New Zealand Government and is Tested Certified Manuka.
This means each batch has been tested at an independent laboratory for five key markers which prove the honey was made from nectar gathered by bees from the Mānuka bush. The markers are made up of four naturally-occurring chemicals and one DNA marker from Mānuka pollen.
Manuka Monofloral or Manuka multifloral – and a whole load of numbers!
Our jars also state the honey is either “Manuka” or “Manuka multifloral”. This tells you whether the honey is made predominantly from nectar from the Mānuka bush (monofloral) or from a combination of Mānuka and other flowers (multifloral).
Independent testing establishes how much of each of the five markers are in each batch of honey – and these results are used to determine whether it is monofloral or multifloral Manuka Honey. Typically, monofloral products contain higher levels of the natural chemicals associated with the Mānuka bush.
What’s the science behind the official definition of monofloral and multifloral New Zealand Manuka Honey?
There are five key markers which identify whether Manuka Honey is monofloral or multifloral. The first four are chemical markers known as phenolic acids. Their full names are called 3-Phenyllactic acid, 2-Methoxyacetophenone, 2-Methoxybenzoic acid and 4-Hydroxypheyllactic acid.
For honey to be classed as “monofloral” it has to contain at least 400mg/kg of 3-PLA and 5mg/kg of 2-MAP, as well as at least 1mg/kg of the other two chemicals. “Multifloral” Manuka Honey contains between 20 and 400 mg/kg of 3-PLA and at least 1mg/kg of the other three chemicals.
All honey which is exported from New Zealand as “Mānuka” must also contain a DNA marker from Mānuka pollen, which confirms it has come from the bush. This is why every batch of TranzAlpine Manuka honey has been confirmed by independent laboratory testing.
How are the tests done?
Only two independent IANZ laboratories in New Zealand are approved by the NZ Government to carry out independent testing of these five Mānuka markers.
They are Analytica Laboratories and Hill Laboratories.
Four chemical markers are tested using a Government-recommended chemical analysis technique called LC-MS (liquid chromatography–mass spectrometry). It’s a highly analytical technique which is expensive but very reliable and wonderfully precise and scientific, so it is free from interferences which could give inaccurate results.For the DNA testing labs use analytical technique called quantitative PCR, which is also Government-recommended. Their use it for a range of services in the business and it’s a technology which is very well established and there a high degree of confidence in its accuracy.”