Abstract
The collagens from squid (Todarodes pacificus ) skin and Alaska pollack ( Theragra chalcogramma) skin were extracted and their physicochemical properties were investigated. The yield was improved with the increase of NaOH concentration and was increased Neutrase than Alcalase in enzymatic hydrolysates. Protein and collagen contents from Alaska pollack skin were 38.3 ∼62.7% and 13.1∼28.9%, respectively. All enzymatic hydrolysates also showed high antioxidant activities as NaOH concentration decrease. Composition of their amino acids was mainly glycine and proline. The spectrum of FT-IR of the collagen showed wavenumber at 1,631 cm-1 , 1,549 cm -1 , 1,234 cm -1 and 3,322 cm -1 representing the regions of amide Ⅰ, amide Ⅱ, amide Ⅲ and amide A, respectively. The decomposition temperature for the collagen was in the range of 300℃ and showed relatively good enough for their thermal stabilities.
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