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Glucose Oxidase: An enzyme of the oxidoreductase class that catalyzes the conversion of beta-D-glucose and oxygen to D-glucono-1,5-lactone and peroxide. It is a flavoprotein, highly specific for beta-D-glucose. The enzyme is produced by Penicillium notatum and other fungi and has antibacterial activity in the presence of glucose and oxygen. It is used to estimate glucose concentration in blood or urine samples through the formation of colored dyes by the hydrogen peroxide produced in the reaction. (From Enzyme Nomenclature, 1992) EC
 JoVE Genetics

Genetic Engineering of an Unconventional Yeast for Renewable Biofuel and Biochemical Production

1Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, 2NUS Synthetic Biology for Clinical and Technological Innovation (SynCTI), Life Sciences Institute, National University of Singapore, 3Food Science and Chemical Engineering, Singapore Institute of Technology

JoVE 54371

 Science Education: Essentials of General Chemistry

Introduction to Titration

JoVE Science Education

Source: Laboratory of Dr. Yee Nee Tan — Agency for Science, Technology, and Research

Titration is a common technique used to quantitatively determine the unknown concentration of an identified analyte.1-4 It is also called volumetric analysis, as the measurement of volumes is critical in titration. There are many types of titrations based on the types of reactions they exploit. The most common types are acid-base titrations and redox titrations.5-11 In a typical titration process, a standard solution of titrant in a burette is gradually applied to react with an analyte with an unknown concentration in an Erlenmeyer flask. For acid-base titration, a pH indicator is usually added in the analyte solution to indicate the endpoint of titration.12 Instead of adding pH indicators, pH can also be monitored using a pH meter during a titration process and the endpoint is determined graphically from a pH titration curve. The volume of titrant recorded at the endpoint can be used to calculate the concentration of the analyte based on the reaction stoichiometry. For the acid-base titration presented in this video, the titrant is a standardized sodium hydroxide solution and the analyte is domestic vinegar. Vinegar is an acidic liquid that

 JoVE Biology

En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries

1Cardiovascular and Aging Research, Department of Medicine, Division of Physiology, Faculty of Science, University of Fribourg, 2Kidney Control of Homeostasis, Swiss National Centre of Competence in Research, 3System Physiology, Department of Medicine, Division of Physiology, Faculty of Science, University of Fribourg

JoVE 53718

 JoVE Bioengineering

Bacterial Detection & Identification Using Electrochemical Sensors

1Research Service, Veterans Affairs Greater Los Angeles Healthcare System, 2Department of Urology, The David Geffen School of Medicine, University of California, Los Angeles, 3GeneFluidics, 4Division of Infectious Diseases, Veterans Affairs Greater Los Angeles Healthcare System, 5Department of Microbiology, Immunology & Molecular Genetics, University of California, Los Angeles

JoVE 4282

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