*2.3. Determination of Extraction Rate and Purity of QPI*

The extraction rate and purity of QPI were determined according to the method described by Ruiz et al. [1]. The protein content refered to the method of Miller et al. [23]

$$\text{The extraction rate of QPI} \left( \% \right) = \frac{\text{Isolate protein content} \left( \% \right) \times \text{isolate weight} \left( \text{g} \right)}{\text{floor protein content} \left( \% \right) \times \text{flow weight} \left( \text{g} \right)} \times 100 \tag{1}$$

$$\text{The purity of QPI} \left( \% \right) = \frac{\text{Isolate protein content} \left( \% \right) \times \text{isolate weight} \left( \text{g} \right)}{\text{isolate weight} \left( \text{g} \right)} \times 100 \tag{2}$$
