Lokman Liv

Bio: Lokman Liv is an academic researcher from Scientific and Technological Research Council of Turkey. The author has contributed to research in topics: Chemistry & Medicine. The author has an hindex of 5, co-authored 20 publications receiving 68 citations.

Fluorescent and electrochemical detection of Cu (II) ions in aqueous environment by a novel, simple and readily available AIE probe

Abstract: We have devised a novel and fluorescent chemodosimeter (ANT-Fe), possessing an anthracene scaffold as a fluorophore and ferrocene as a redox active unit for selective and sensitive detection of Cu2+ ions in aqueous media Its synthesis was realized by a simple combination of two commercially available compounds, 2-aminoanthracene and ferrocenecarboxaldehyde, in one-step without required column chromatography for the purification process The probe offers distinct properties such as aggregation induced emission, dual sensing mode of fluorometric “turn-off” and electrochemical signaling with cathodic shift, high selectivity towards Cu2+ ions, fast response time and low detection limit (25 ppb) via C N bond hydrolysis Detection of Cu2+ ions by ANT-Fe adsorbed on a test paper system with the naked eye as a practical application is also successfully reported

Simple and rapid voltammetric determination of boron in water and steel samples using a pencil graphite electrode

Abstract: This paper presents a simple, rapid, and accurate voltammetric method for determination of boron in water and steel samples using a disposable pencil graphite electrode. The oxidation of Tiron in the boron-Tiron complex in phosphate buffer at pH 7.5 was measured as a response. Type and concentration of supporting electrolyte, pH, ionic strength, Tiron concentration, scan rate, step amplitude, pulse amplitude, and pencil grade were investigated as the parameters affecting the peak current. The limit of detection (3s) was estimated as 84 $\mu $g/L. The relative standard deviation of the method was 4.6 for 1 mg B/L (N = 7). The recovery results varied between 90% and 103% for water samples and between 94% and 108% for steel samples. The results were compared with those obtained from the ICP-OES method and no statistically significant difference between the methods was found.

Pencil Graphite Electrodes: A Versatile Tool in Electroanalysis.

Abstract: Due to their electrochemical and economical characteristics, pencil graphite electrodes (PGEs) gained in recent years a large applicability to the analysis of various types of inorganic and organic compounds from very different matrices. The electrode material of this type of working electrodes is constituted by the well-known and easy commercially available graphite pencil leads. Thus, PGEs are cheap and user-friendly and can be employed as disposable electrodes avoiding the time-consuming step of solid electrodes surface cleaning between measurements. When compared to other working electrodes PGEs present lower background currents, higher sensitivity, good reproducibility, and an adjustable electroactive surface area, permitting the analysis of low concentrations and small sample volumes without any deposition/preconcentration step. Therefore, this paper presents a detailed overview of the PGEs characteristics, designs and applications of bare, and electrochemically pretreated and chemically modified PGEs along with the corresponding performance characteristics like linear range and detection limit. Techniques used for bare or modified PGEs surface characterization are also reviewed.

Perspective—Challenges in Biomedical Analysis: From Classical Sensors to Stochastic Sensors

Abstract: Biomedical analysis needs fast reliable screening methods able to identify and also quantify substances of clinical interest. Diseases such as, cancer, diabetes, corona, influenza, stroke, cardiovascular diseases need an early detection. Therefore, developing new reliable electrochemical sensors may contribute to improving of the state of health and of the quality of life of people, by early detection of specific biomarkers able to predict the disease. Going to stochastic sensors for biomedical analysis is not just a trend. The screening tests are cost effective, and easy to be used, no sampling being needed before analysis.

Measurement of pH

Abstract: The measurement of pH is one of the most basic and necessary skills in a life science laboratory. The function and physical characteristics of biological molecules are highly sensitive to the pH of the environment. Common biological buffers must be prepared with the appropriate pH, usually close to neutral for most biological applications. This unit includes a discussion of the different pH instrumentation, notably pH electrodes. It also relates basic pH measurement theory to critical parameters for the technique, and covers the correct use, handling, and storage of pH instruments. Curr. Protoc. Essential Lab. Tech. 3:3.2.1-3.2.16. © 2010 by John Wiley & Sons, Inc. Keywords: electrode; meter; calibration; Nernst; electrical potential