Publication Type:

Journal Article

Source:

Journal of Molecular Catalysis B: Enzymatic, Volume 96, p.6 - 13 (2013)

URL:

http://www.sciencedirect.com/science/article/pii/S1381117713001550

Keywords:

Magnetite Nanoparticles

Abstract:

Abstract In this work, α-amylase is immobilized, using glutaraldehyde, onto magnetite nanoparticles prepared using gum acacia as the steric stabilizer (GA-MN), for the first time. The immobilization of amylase to GA-MN is very fast and the synthesis of GA-MN is very simple. The use of \{GA\} enables higher immobilization of α-amylase (60%), in contrast to the unmodified magnetite nanoparticles (∼20%). The optimum pH and temperature for maximum enzyme activity for the immobilized amylase are identified to be 7.0 and 40 °C, respectively, for the hydrolysis of starch. The kinetic studies confirm the Michaelis–Menten behavior and suggests overall enhancement in the performance of the immobilized enzyme with reference to the free enzyme. Similarly the thermal stability of the enzyme is found to increase after the immobilization. The GA-MN bound amylase has also been demonstrated to be capable of being reused for at least six cycles while retaining ∼70% of the initial activity. By using a magnetically active support, quick separation of amylase from reaction mixture is enabled. The catalytic rate of amylase is actually found to enhance by twofold after the immobilization, which is extremely advantageous in industry. At higher temperature, the immobilized enzyme exhibits higher enzyme activity than that of the free enzyme.

Cite this Research Publication

Dr. Swarnalatha V, Dhamodharan, R., and Esther, R. Aluri, “Immobilization of α-amylase on gum acacia stabilized magnetite nanoparticles, an easily recoverable and reusable support”, Journal of Molecular Catalysis B: Enzymatic, vol. 96, pp. 6 - 13, 2013.

207
PROGRAMS
OFFERED
6
AMRITA
CAMPUSES
15
CONSTITUENT
SCHOOLS
A
GRADE BY
NAAC, MHRD
8th
RANK(INDIA):
NIRF 2018
150+
INTERNATIONAL
PARTNERS