Standard curve obtained from the different concentrations of BSA was Y = 0.783X (r2 = 0.999), where Y represents the
optical density at 570nm and X was the BSA concentration. b-value, the amount of CTs used to bind half of the maximum
BSA is used to denote the protein binding affinity of CTs, i.e. protein binding affinity of the CTs is stronger when its b-value is
smaller. The b-value of the CTs extracted from LLB was 0.305±0.05, while that for LLL was 0.420±0.02, indicating stronger
protein binding affinity of CTs of LLB than that of LLL (Fig. 2).