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.
Nutrition Information. Pea and whey powders come in concentrate and isolate forms. Concentrate powders usually contain at least 70 percent protein, but isolate powders contain more, up to 95 percent protein. Some powders contain a mixture of concentrate and isolate.