“…A third band was observed at 220 kDa, and it was assumed that this band is a beta-chain from crosslinking between two chains. Similar results were observed from previous works with different species showing alpha-1, alpha-2 and beta-chain conformations (Cheng, Hsu, Chang, Lin, & Sakata, 2009;Li et al, 2013;Lin, Lin, & Su, 2011;Santos et al, 2013;Tamilmozhi, Veeruraj, & Arumugam, 2013). There were no differences of molecular weight between the acid and enzymatic treatments, which means that the enzymes did not alter the structure of the collagen molecule (Skierka & Sadowska, 2007).…”