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TA vs MGO: The Science of Testing High-Strength Bioactive Honey
Total Activity (TA) vs Methylglyoxal (MGO) (CH₃C(O)CHO)
Understanding The Ratings
When investing in premium therapeutic honey, navigating the different numbers on the labels can be confusing. Understanding the TA and MGO honey ratings is the key to knowing exactly what active power you are paying for. While traditional Manuka relies on a static chemical compound measured by Methylglyoxal (MGO), native Australian honeys like Yarri Blackbutt draw their incredible strength from dynamic, living enzymes measured by Total Activity (TA).
In this guide, we will explore the science behind bioactive honey testing and compare the real-world benefits of Manuka honey and Yarri Blackbutt honey. This information should help you choose the most effective option for your health.
The TA Test: The "Live Action" Biological Assay
How Scientists Determine the Total Activity (TA) Rating
Unlike chemical counting, Total Activity (TA) testing evaluates a honey's real-world bioactive performance. Scientists utilise a microbiological assay—a live biological test—to observe exactly how effectively the dynamic enzymes in honeys like Yarri Blackbutt halt bacterial growth.
The Lab Process: The Agar Well Diffusion Method
Preparing the Benchmark: Scientists coat a Petri dish containing nutrient agar with a standardised strain of bacteria (Staphylococcus aureus), which is utilised globally as the strict scientific benchmark for measuring antimicrobial resistance.
Cutting the Wells: Small circular holes (wells) are punched into the agar plate.
Adding the Honey: Samples of the honey are diluted with water—a crucial step that awakens the natural glucose oxidase enzyme—and placed into the wells.
The Control Solution: In separate wells on the same plate, scientists add varying concentrations of pure phenol (a powerful industrial antiseptic, such as 20% or 35% solutions) to act as a comparative baseline.
Incubation & Measurement: The plate is incubated at 37°C for 24 hours. As the honey's enzymes wake up and release hydrogen peroxide, the peroxide diffuses outward into the agar, killing the bacteria around the well. This leaves a clear ring of dead bacteria officially known as the Zone of Inhibition.
Calculating the Final TA Score
To determine the final certification, scientists measure the precise diameter of the honey's Zone of Inhibition and compare it directly to the zones created by the phenol solutions:
TA 20+: The honey creates a clearing zone equal to a 20% pure phenol solution.
TA 35+: The honey matches or exceeds the clearing power of a 35% phenol solution, earning an elite, high-strength badge.
Because this physical test captures the combined, dynamic force of both the active hydrogen peroxide and any native plant-based non-peroxide factors, it is accurately termed Total Activity.
MGO Testing: The Chemical Counting
How Scientists Evaluate Manuka MGO (Methylglyoxal)
Unlike the live bacterial testing used for TA, evaluating Manuka's MGO rating is a purely chemical testing process. It doesn't measure live bacterial death in a dish; instead, it counts the physical mass of the Methylglyoxal molecule present in the honey.
The Lab Process: (High-Performance Liquid Chromatography) HPLC
Extraction: A precise sample of Manuka honey is dissolved in a solvent to extract its organic compounds.
The HPLC Machine: The liquid sample is injected into a sophisticated instrument known as a High-Performance Liquid Chromatograph.
Separation: The machine pumps the liquid at incredibly high pressure through a specialised tube (column) packed with microscopic particles. Because different molecules move through this column at different speeds based on their size and chemical properties, they separate cleanly from one another.
Detection: As the separated molecules emerge from the column, a detector measures how much light they absorb at a specific wavelength, creating a digital peak on a graph.
Calculating the Final MGO Score
The size of the "MGO peak" on the laboratory graph tells scientists exactly how many milligrams of Methylglyoxal are packed into every single kilogram of honey.
MGO 400+ means the lab instrument detected at least 400 mg of methylglyoxal per 1 kg of honey.
MGO 2000+ means a massive 2000 mg (2 grams) of pure chemical methylglyoxal is present per 1 kg of honey.
TA (Total Activity) vs NPA (Non Peroxide Activity)
TA vs MGO
While enzymes and chemical compounds behave differently, independent laboratory testing allows
us to map the raw bioactive firepower of the TA scale against equivalent Manuka MGO ratings:
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