Polycrystalline bismuth oxide films for development of amperometric biosensor for phenolic compounds

CuO‐Doped Mesoporous Silica Hybrid for Rapid and Sensitive Amperometric Detection of Phenolic Compounds

“…The maximum response was obtained at pH 6.0, which was in good accordance with other results for Tyr-based biosensors [2,3,5,8] and close to that of the free Tyr from mushroom (pH 6.2) [25]. This indicated that the immobilization procedure did not alter the optimum pH of Tyr.…”

“…Although a biosensor based on calcium phosphate cement showed a higher sensitivity to catechol (46.6 A M À1 cm À2 ) [3], the response decreased gradually down to 40 % after 9 days of storage in the buffer solution, indicating worse stability than the proposed biosensor, which was discussed in next section. The value of apparent Michaelis-Menten constant (K M app ) for catechol was obviously lower than those reported for other biosensors such as chitosan/layered double hydroxides (LDH) (130 mM) [8] and Tyr/polycrystalline bismuth oxide (BiOx) (113 mM) [2], indicating that the Tyr immobilized in CuO/SBA-15/Au film had higher affinity to phenolic compounds. Although the response of catechol was much faster and stronger than those of monophenols, it showed larger K M app than that of pcresol.…”

“…Electrochemical techniques are most suitable for in situ monitoring of phenolic compounds due to their high sensitivity, rapid response, and convenient operation. Particularly, amperometric biosensor based on tyrosinase (Tyr) has been considered as a promising tool for the detection of phenolic compounds [1][2][3], in which the electrochemical signal comes from the reduction of o-quinones produced in the enzymatic oxidation of phenolic compounds by oxygen in presence of Tyr [4,5]. Thus it is crucial to explore new materials for effective immobilization of the enzyme and enhancement of the electrocatalytic reduction of o-quinones.…”

Electrochemical sensors and biosensors for the pharmaceutical and environmental analysis

“…One of this was using for the first time a polycrystalline BiOx films for the entrapment of biomolecules. This procedure constituted an inexpensive, fast and easy method for the elaboration of enzyme electrodes, by the simple mixing of the colloidal suspension of bismuth oxide with proteins, followed by their deposition on the electrode surface (Shan et al, 2009). Since PPO catalyses the formation of ortho-quinone and subsequent consumption of dioxygen, the majority of the PPO-based biosensors involves an amperometric transduction based on the quinone reduction.…”

The Evidences of Morphology Dependent Electroactivity Toward CO Oxidation over Bismuth Oxide Supported Pt

“…Bismuth oxide is one of the important transition metal oxides, which plays a significant role in amperometric biosensor [33], solid oxide fuel cells (SOFC) [34][35][36], optical coatings [37][38][39] etc. In addition, Bi 2 O 3 is nontoxic and has excellent chemical inertness.…”