1 Yellow media without gas pocket-sugar utilization with production of acid only. 2  Red media (no change in media) -no change and no sugar utilization. 3  Pink media especially at the top, ignore gas-no sugar utilization with degradation of protein resulting in alkaline end products (this may be difficult to see).
With organic solvents with long alkane chain, such as n-hexadecane and n-decane, the water droplets become much larger and the microemulsion is unstable. In this case, solvent polarity may have become a determining factor and the long alkane chain was too hydrophobic to form a stable microemulsion with water.
Hexane is a chemical commonly extracted from petroleum and crude oil. It is a colorless liquid that gives off a subtle, gasoline-like odor.Hexane is highly flammable, yet it can be found in many household products such as stain removers for arts and crafts projects.afely Handling Hexane & First Aid. Exposure to hexane is most likely to occur in the workplace. It is recommended that you wear protective gloves, safety goggles, protective clothing and breathing protection when working with the chemical.