title: Conversion of squid pen by Serratia ureilytica for the production of enzymes and antioxidants.
abstract: Two proteases (P1 and P2) and a chitinase (C1) were purified from the culture supernatant of Serratia ureilytica TKU013 with squid pen as the sole carbon/nitrogen source. The molecular masses of P1, P2 and C1 determined by SDS-PAGE were approximately 50 kDa, 50 kDa and 60 kDa, respectively. The optimum pH, optimum temperature, pH stability, and thermal stability of P1, P2 and C1 were (pH 10, 40 degrees C, pH 7-11, and <50 degrees C), (pH 10, 40 degrees C, pH 8-11, and <40 degrees C) and (pH 6, 50 degrees C, pH 5-8, and <50 degrees C), respectively. P1 and P2 were inhibited by Mg(2+), EDTA and C1 was inhibited completely by Cu(2+). The antioxidant activity of TKU013 culture supernatant was 72% per mL (DPPH scavenging ability). With this method, we have shown that squid pen wastes can be utilized and have revealed its hidden potential in the production of functional foods.
authors.affiliation: Graduate Institute of Life Sciences, Tamkang University, Tamsui 251, Taiwan.
authors.forename: San-Lang
authors.initials: SL
authors.lastname: Wang
authors.forename: Chin-Lin
authors.initials: CL
authors.lastname: Lin
authors.forename: Tzu-Wen
authors.initials: TW
authors.lastname: Liang
authors.forename: Kao-Cheng
authors.initials: KC
authors.lastname: Liu
authors.forename: Yi-Hsuan
authors.initials: YH
authors.lastname: Kuo
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D001711:Biotransformation; D002688:Chitinases / Q000378:metabolism*; D049832:Decapodiformes / Q000737:chemistry* / Q000382:microbiology*; D010447:Peptide Hydrolases / Q000378:metabolism*; D011208:Powders; D012705:Serratia / Q000145:classification* / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D000975:Antioxidants; D011208:Powders; D002688:Chitinases; D010447:Peptide Hydrolases