Carboxyl groups have an electronegative oxygen atom double bonded to a carbon atom. This carbon-oxygen bond is very polar and the fact that its a double bond increases the polarity of the bond.
PEA agar, also referred to as Phenylethyl Alcohol Agar is a medium  used by microbiologists to grow microorganisms. The ingredient that  supplies nitrogen is casein. Making the world better, one answer at a time.
The production of the pea protein found in 100% Pure Pea Protein is safe and simple: By not using nitrogen-rich fertilizers or chemical solvents in harvesting and production, the manufacturer of Mercola Pea Protein helps protect the environment.