Total protein amount was determined by using Pierce® BCA
(bicinchonic acid) protein assay kit of Thermo scientific. The
colorimetric method is based on the reduction of Cu2þ to Cuþ by
protein and complex formulation with BCA in the following (Smith
et al., 1985). The absorbance of purple-colored product can be
detected at 560 nm (Tecan infinite 200). Bovine serum albuminwas
used as protein standard for the BCA assay. Samples were centrifuged
at 18.000 g, 4 C for 60 min initially. Experiments were carried
out in two independent series and measured in triplicates.