Related Experiment Video
Updated: Feb 16, 2026
13:09
Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
Published on: January 6, 2016
15.4K
Isatin Detection Using a Boron-Doped Diamond 3-in-1 Sensing Platform
Mary Ensch1,2, Vanessa Y Maldonado3,4, Greg M Swain4
1Fraunhofer USA, Inc. Center for Coatings and Diamond Technologies, East Lansing, Michigan 48824-1226, United States.
Analytical Chemistry
|January 4, 2018
Summary
Two novel boron-doped diamond (BDD) electrochemical sensors were developed to detect isatin. The microelectrode array (MEA) sensor achieved a low limit of detection (LOD) of 0.04 μM, outperforming the macroelectrode (MAC) sensor and UV-vis spectrophotometry.
Area of Science:
- Electrochemistry
- Materials Science
- Analytical Chemistry
Background:
- Boron-doped diamond (BDD) offers high chemical sensitivity and stability for electrochemical sensing.
- BDD's microfabrication flexibility enables the development of advanced sensing devices.
- Isatin, an indole derivative, exhibits anxiogenic properties and anticonvulsant activity, making its detection important.
Purpose of the Study:
- To fabricate and characterize two distinct 3-in-1 BDD electrode sensors for isatin detection.
- To compare the analytical performance of a microelectrode array (MEA) sensor versus a macroelectrode (MAC) sensor.
- To evaluate the stability of a BDD quasi-reference electrode and assess sensor performance in a complex matrix.
Main Methods:
- Fabrication of two 3-in-1 BDD sensors with different working electrode geometries (MEA and MAC).
- Characterization of BDD quasi-reference electrode stability against a traditional Ag/AgCl electrode across different pH levels.
- Electrochemical detection of isatin in phosphate-buffered saline (PBS) and urine simulant using both sensor types.
- Comparison of limits of detection (LOD) with UV-vis spectrophotometry.
Main Results:
- The BDD quasi-reference electrode demonstrated stable potential (-0.2 V vs Ag/AgCl at pH 7) over 30 hours.
- The MEA sensor achieved a significantly lower LOD for isatin (0.04 μM) compared to the MAC sensor (0.22 μM).
- Both BDD sensors exhibited lower LODs than UV-vis spectrophotometry (0.57 μM) and performed well in a urine simulant matrix.
Conclusions:
- The developed 3-in-1 BDD sensors are effective for sensitive isatin detection.
- The MEA configuration offers superior performance for isatin detection compared to the MAC configuration.
- BDD-based electrochemical sensors show promise for analyzing complex samples and integration into chromatographic methods.
Related Concept Videos
02:57The Sense of Self: Reflected Self-Appraisal and Social Comparison
56.2K
According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
56.2K
01:26Introduction to Special Senses
7.7K
Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
7.7K
01:27Tactile and Chemical Senses
881
Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
881
01:11ortho–para-Directing Activators: –CH3, –OH, –NH2, –OCH3
7.6K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
7.6K
02:15SN1 Reaction: Stereochemistry
10.5K
This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
10.5K
02:05SN1 Reaction: Kinetics
9.7K
In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
9.7K