title: Development and analytical application of a glucose biosensor based on glucose oxidase/O-(2-hydroxyl)propyl-3-trimethylammonium chitosan chloride nanoparticle-immobilized onion inner epidermis.
abstract: A glucose biosensor comprising a glucose oxidase/O-(2-hydroxyl)propyl-3-trimethylammonium chitosan chloride nanoparticle (O-HTCC NP)-immobilized onion inner membrane and a dissolved oxygen (O(2)) sensor has been successfully developed. The detection scheme is based on the depletion of dissolved O(2) content upon exposure to glucose. The decrease in O(2) level was monitored and related to the glucose concentration. The biosensor shows linear response to glucose from 0.0 to 0.60 mM with a detection limit of 50 microM (S/N=3). The effect of O-HTCC NP and enzyme loading, pH, temperature, and phosphate buffer concentration on the sensitivity of the biosensor was studied in detail. The biosensor exhibits fast response time (70s), good repeatability (3.2%, n=10) and storage stability (90% of initial sensitivity after 3-week storage). Common interferents including acetic acid, lactic acid, propionic acid, butyric acid, folic acid, methanol, glycine, DL-alpha-alanine and DL-cysteine do not cause significant interferences on the biosensor. The proposed biosensor method was successfully applied to determine the glucose content in real samples such as orange juice, red wine and tea drink and the results were comparable to that obtained from a spectrophotometric method. The glucose recovery test demonstrates that the proposed glucose biosensor offers an excellent, accurate and precise method for the determination of glucose in real samples.
authors.affiliation: Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education & Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences, 430074 Wuhan, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Yao
authors.forename: Mohammad
authors.initials: M
authors.lastname: Russel
authors.forename: Huilun
authors.initials: H
authors.lastname: Chen
authors.forename: Ke
authors.initials: K
authors.lastname: Chen
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Brunello
authors.initials: B
authors.lastname: Ceccanti
authors.forename: Gyula
authors.initials: G
authors.lastname: Zaray
authors.forename: Martin M F
authors.initials: MM
authors.lastname: Choi
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D048271:Chitosan / Q000031:analogs & derivatives* / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005947:Glucose / Q000032:analysis*; D005949:Glucose Oxidase / Q000737:chemistry*; D019697:Onions / Q000737:chemistry*; D019441:Plant Epidermis / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: C495830:chitosan-N-2-hydroxypropyl trimethyl ammonium chloride; D048271:Chitosan; D005949:Glucose Oxidase; D005947:Glucose