For the most curcumin, be sure to use turmeric rather curry powderâa study analyzing curcumin content in 28 spice products described as turmeric or curry powders found that pure turmeric powder had the highest concentration of curcumin, averaging 3.14% by weight.
The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.
Octane ratings explained. So now we know what engine knock is and how to prevent it. We are ready to look at how anti-knock properties are measured: octane ratings. There is only one way to measure the anti-knock properties of a fuel: burn it in an engine and see how much it knocks.