Brassica oleracea (turnip) protein is not a single defined chemical compound but a complex mixture of plant storage proteins, enzymes, and structural proteins extracted from turnip roots (correct species Brassica rapa). These proteins typically include cruciferin-like globulins and albumins with variable amino acid sequences. They function in plant nutrition and defense. In food science, turnip proteins contribute to nutritional value but lack standardized chemical properties like fixed boiling or melting points due to their macromolecular and heterogeneous nature. Solubility depends on pH, ionic strength, and specific protein fractions, generally showing moderate water solubility at neutral pH.