Immobilization of laccase in kappa-carrageenan based semi-interpenetrating polymer networks

Makas, Y. Gizem
Hasırcı, Nesrin
Laccase enzyme (L) was immobilized by entrapment into semi-interpenetrating polymer networks (semi-IPNs) prepared from kappa-carrageenan with either poly(acrylamide-acrylic acid) [P(AAm-AA)/kappa-car] or poly(acrylamide-itaconic acid) [P(AAm-IA)/kappa-car]. For both systems, immobilized enzymes achieved the same optimum values observed for free enzyme (pH = 5.0 and T = 40 degrees C), except for P(AAm-IA)/kappa-car system there was a shift to 5.5 in optimum pH value. At the end of 42 days of storage immobilized enzymes retained more than 80% of their original activities while the retained activities of both systems after 10 uses in batch type application were found to be higher than 50%. K-m values were calculated as 2.52 x 10(-2) mM and 1.08 x 10(-2) mM and V-max values were found as 6.8 x 10(-3) mM min(-1) and 4.4 x 10(-3) mM min(-1), for P(AAm-AA)/kappa-car-L and P(AAm-IA)/kappa-car-L, respectively. When methyl orange containing solutions (10 mg/L) were treated with the immobilized laccases (68.2 U), enzymatic decolorization of methyl orange in 6 h was achieved to the level of 35% for both systems. Supplementing the reaction medium with ABTS as the redox mediator increased this value to about 70%. These initial results show that, laccase containing semi-IPNs can find some applications in decolorization of the industrial wastes.


Polyacrylamide-based semi-interpenetrating networks for entrapment of laccase and their use in azo dye decolorization
Koklukaya, Selva Zeynep; Sezer, Serdar; AKSOY, SERPİL; Hasırcı, Nesrin (2016-09-01)
In this study, laccase from Trametes versicolor was immobilized in poly(acrylamide-crotonic acid)/sodium alginate [P(AAm-CrA)/alginate], poly(acrylamide-crotonic acid)/K-carrageenan [(P(AAm-CrA)/K-car)], poly(acrylamide-citraconic acid)/sodium alginate (P(AAm-CA)/alginate), and poly(acrylamide-citraconic acid)/K-carrageenan (P(AAm-CA)/K-car) semi-interpenetrating network by entrapment method. Optimum pH and temperatures values were determined between 5.0-6.0 and 40-50 degrees C for free laccase (FL) and imm...
DEMIRCIOGLU, H; BEYENAL, H; TANYOLAC, A; Hasırcı, Nesrin (1994-12-01)
Enzyme urease was immobilized in copolymer matrices of 2-hydroxyethyl methacrylate (HEMA) and N-vinyl pyrrolidone (VP). The activities of immobilized urease stored in phosphate buffer solution of pH 7.0 at 4-degrees-C were examined periodically for up to 90 days. For the matrices of higher VP/HEMA mole ratio in the structure, a higher volume increase and enhanced apparent activity were observed, while HEMA polymer alone proved to have the most stable matrix for prolonged activity. No appreciable amount o...
Synthesis and characterization of thiophen-3-yl-acetic acid 4-pyrrol-1-yl-phenyl ester and its conducting polymers
Bingöl, Bahar; Toppare, Levent Kamil; Department of Chemistry (2003)
Thiophen-3-yl acetic acid 4-pyrrol-1-yl phenyl ester (TAPE) monomer was synthesized by the reaction of thiophene acetic acid with thionyl chloride, and further reaction of thiophen-3-yl-acetyl chloride with 4-pyrrol-1-yl phenol. Electrochemical behavior of this monomer (TAPE) was determined by cyclic voltammetry. Homopolymers were achieved both by using electrochemical and chemical polymerization techniques. Copolymers of TAPE in the presence of bithiophene and pyrrole were synthesized by potentiostatic ele...
Immobilization of cholesterol oxidase in a conducting copolymer of thiophene-3-yl acetic acid cholesteryl ester with pyrrole
Çırpan, Ali; Toppare, Levent Kamil; YAGCI, Y (Informa UK Limited, 2003-01-01)
Cholesterol oxidase has been immobilized in conducting copolymers of thiophene-3-yl acetic acid cholesteryl ester with pyrrole (CM/PPy) and polypyrrole (PPy) via electropolymerization. p-Toluene sulphonic acid was used as the supporting electrolyte. Kinetic parameters (V-max and K-m) and operational stability of enzyme electrodes were investigated. Surface morphology of the films was examined by scanning electron microscope.
Conducting graft copolymers of pyrrole and thiophene with random copolymers of methyl methacrylate and 3-methylthienyl methacrylate
Guner, Y; Toppare, Levent Kamil; Hepuzer, Y; Yagci, Y (2004-08-01)
Random copolymers of 3-methyl thienylmethacrylate and methyl methacrylate were synthesized via free radical polymerization. Electro-copolymerizations of random copolymers with thiophene and/or pyrrole were carried out in acetonitrile-tetrabutylammonium tetrafluoroborate (TBAFB), water-p-toluene sulfonic acid (PTSA) solvent-electrolyte couples. Oxidative polymerization of thiophene functionalized random copolymer was also achieved by constant current electrolysis and chemical polymerization. The characteriza...
Citation Formats
Y. G. Makas, N. KALKAN, S. AKSOY, H. ALTINOK, and N. Hasırcı, “Immobilization of laccase in kappa-carrageenan based semi-interpenetrating polymer networks,” JOURNAL OF BIOTECHNOLOGY, pp. 216–220, 2010, Accessed: 00, 2020. [Online]. Available: