title: Acidic proteases from Monterey sardine (Sardinops sagax caerulea) immobilized on shrimp waste chitin and chitosan supports: searching for a by-product catalytic system.
abstract: Solid wastes generated from the seafood industry represent an important environmental pollutant; therefore, utilization of those wastes for the development of processing biochemical tools could be an attractive and clean solution for the seafood industry. This study reports the immobilization of semi-purified acidic proteases from Monterey sardine stomachs onto chitin and chitosan materials extracted from shrimp head waste. Several supports (chitosan beads, chitosan flakes, and partially deacetylated flakes) were activated either with genipin or Na-tripolyphosphate and evaluated as a mean to immobilize acidic proteases. The protein load varied within the 67-91% range on different supports. The immobilization systems based on chitosan beads achieved the highest protein loads but showed the lowest retained catalytic activities. The best catalytic behavior was obtained using partially deacetylated chitin flakes activated either with genipin or Na-tripolyphosphate. According to results, the immobilization matrix structure, as well as acetylation degree of chitin-chitosan used, has considerable influence on the catalytic behavior of immobilized proteases. Partially deacetylated chitin flakes represent a suitable option as support for enzyme immobilization because its preparation requires fewer steps than other supports. Two abundant seafood by-products were used to obtain a catalytic system with enough proteolytic activity to be considered for biotechnological applications in diverse fields.
authors.affiliation: Centro de Investigacion en Alimentacion y Desarrollo, A.C. Carretera a la Victoria, 83304, Hermosillo, Sonora, Mexico.
authors.forename: Jesus Aaron
authors.initials: JA
authors.lastname: Salazar-Leyva
authors.forename: Jaime
authors.initials: J
authors.lastname: Lizardi-Mendoza
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Ramirez-Suarez
authors.forename: Elisa Miriam
authors.initials: EM
authors.lastname: Valenzuela-Soto
authors.forename: Josafat Marina
authors.initials: JM
authors.lastname: Ezquerra-Brauer
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Castillo-Yañez
authors.forename: Ramon
authors.initials: R
authors.lastname: Pacheco-Aguilar
mesh_terms: D000818:Animals; D001709:Biotechnology / Q000379:methods; D002686:Chitin / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry; D004800:Enzymes, Immobilized / Q000737:chemistry* / Q000302:isolation & purification; D005399:Fishes / Q000378:metabolism; D007220:Industrial Waste; D039823:Iridoids / Q000494:pharmacology; D033561:Penaeidae / Q000737:chemistry* / Q000187:drug effects; D010447:Peptide Hydrolases / Q000737:chemistry* / Q000302:isolation & purification; D011122:Polyphosphates / Q000494:pharmacology
chemical_list: D004800:Enzymes, Immobilized; D007220:Industrial Waste; D039823:Iridoids; D011122:Polyphosphates; D002686:Chitin; D048271:Chitosan; C007834:genipin; D010447:Peptide Hydrolases; C005692:triphosphoric acid