Polypeptide [Carboxyl groups] (mmol/g) Albumin 56 Prot1 150 Prot2 155 Prot3 90 Prot4 122 Prot5 88 Prot6 87 Prot7 80 Prot8 102

Each experiment was performed 4 times, with an error of 0.5-2%

.Table 3: Carboxyl group content in the proteinoids and albumin.