Development of Amperometric Laccase Biosensor through Immobilizing Enzyme in Magnesium‐Containing Mesoporous Silica Sieve (Mg‐MCM‐41)/Polyvinyl Alcohol Matrix

Abstract

Magnesium-containing mesoporous silica sieve (Mg-MCM-41) provided a suitable immobilization of biomolecule matrix due to its uniform pore structure, high surface areas, fast electron-transfer rate, and good biocompatibility. Based on this, an amperometric biosensor was developed by entrapping laccase into the Mg-MCM-41/PVA composite matrix. Laccase from Trametes versicolor was assembled on a composite film of Mg-MCM-41/PVA modified Au electrode and the electrode was investigated by cyclic voltammetry, impedance spectroscopy, and chronoamperometry. The results indicated that the Mg-MCM-41/PVA/Lac modified electrode exhibited excellent catalytic activity towards catechol at room temperature in pH 4.8 acetate buffer solution. The optimum experimental conditions of biosensor for the detection of catechol were studied in detail. Under the optimal conditions, the linear range was from 0.94 to 10.23 μM with the sensitivity of 16.9227 A/M, the detection limit of 0.00531 μM, and the response time of less than 14 s. The Michaelis-Menten constant (KMapp) was estimated by Lineweaver-Burk equation and theKMappvalue was about 1.01 μM. In addition, the biosensor exhibited high reproducibility and long-time stability. This work demonstrated that Mg-MCM-41/PVA composite provides a suitable support for laccase immobilization and construction of biosensor.

A New Laccase Based Biosensor for Tartrazine

“…Finally, the biosensor response still retained 51.1% of the initial response after 90 days. Stability results for this biosensor were comparable with others laccase based biosensors [ 20 , 21 ]. The results reflected good reproducibility and stability of microspheres-laccase/AuNPs/SPE modified electrode suggesting acceptable storage stability.…”

“…The electrode was immersed in 0.1 M PBS (pH = 5.0) when it was not in use. The electrode performance was checked daily using DPV [ 20 , 21 ].…”

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“…However, PVA is susceptible to deformation at higher temperatures hence the biocatalyst can only be used for low temperature reactions [ 560 ]. To overcome that, PVA has been combined with other supports such as halloysite nanotubes [ 564 ], metal organic frameworks [ 561 ], alginate [ 377 ], xylan [ 565 ] and mesoporous silica [ 328 ].…”

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“…Meso-porous silica sieve matrices possess compatibility and uniformity with respect to well-ordered pore structure, size, density, and surface characteristics. Amperometric detection of catechol has been reported where magnesium-doped mesoporous silica sieve–polyvinyl alcohol composite has been used as a matrix [ 67 ]. Li et al constructed a disposable biosensor using silica sphere on the surface of MWCNT with a screen printed electrode (SPE) for immobilizing Lac and detecting dopamine [ 68 ].…”