How do supra molecules interact with cobalt ions to produce a color change in a colorimetric assay?
Best insight from top research papers
Supramolecular interactions play a crucial role in producing a color change in colorimetric assays involving cobalt ions. These interactions are observed in various sensor designs. For instance, cobalt corrinoids with negatively charged side chains exhibit increased selectivity for cyanide due to additional supramolecular interactions in water . Similarly, dopamine dithiocarbamate functionalized silver nanoparticles (DDTC-Ag NPs) utilize coordinate covalent bonds between catechol groups of DDTC and cobalt ions to induce aggregation of Ag NPs, resulting in a color change from yellow to reddish, enabling sensitive cobalt detection . Additionally, ligands like tris-{(2-carbamoyl-5-carbomethoxy-pyridine)-2-ethyl}amine show selective colorimetric sensing for cobalt(II) ions, with the sensing mechanism involving interactions with weak acid anions, further influencing the color change observed .
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
57 Citations | Supramolecular interactions occur between dopamine dithiocarbamate functionalized silver nanoparticles and cobalt ions, inducing aggregation and a color change from yellow to reddish in the colorimetric assay. |
66 Citations | Supramolecular receptor 1 interacts with cobalt ions through ligand-to-metal charge-transfer, inducing a color change from colorless to pale violet in a near perfect aqueous solution, enabling selective detection. |
61 Citations | The colorimetric chemosensor based on a coumarin skeleton interacts with cobalt ions through intramolecular charge transfer, causing a color change from light yellow to yellowish red in the assay. |
43 Citations | Supramolecular interactions between a tripodal amide ligand and cobalt(II) ions lead to a color change in a colorimetric assay, enabling selective detection at low concentrations. |
101 Citations | Negatively charged side chains of cobalt corrinoids interact supramolecularly with cyanide, enhancing selectivity by 30-fold and sensitivity, leading to a color change in the colorimetric assay. |
Related Questions
What are the sensitivity and specificity limitations of achE based colorimetric pesticide detection methods?5 answersAchE-based colorimetric pesticide detection methods exhibit high sensitivity and specificity limitations. For instance, a study utilizing MnO2/SnO2 nanocomposite for Deltamethrin detection achieved a low LOD of 4.0 ng mL-1, showcasing high sensitivity. Another research focused on parathion detection using LSPR-based colorimetric sensors demonstrated LODs of 100 ppt, indicating high sensitivity and specificity in distinguishing between OP and non-OP pesticides. Additionally, a study on acephate detection through CQD-mediated fluorescence showed a detection limit of 0.052 ppb, surpassing safety standards. Furthermore, a colorimetric aptasensor for ametryn detection exhibited a detection limit of 0.15 μg L−1, highlighting its sensitivity and specificity in environmental sample analysis. These findings collectively emphasize the high sensitivity and specificity achievable with AchE-based colorimetric pesticide detection methods.
What are the limitations of current methods for detecting cobalt in aqueous solutions?4 answersThe limitations of current methods for detecting cobalt in aqueous solutions include challenges such as the need for suitable analysis conditions, limited detection limits, and the complexity of sample preparation. Electrochemical methods like cyclic voltammetry require optimization of parameters like voltage range, scan rate, and pH for accurate detection. Screen-printed electrodes modified with a lead film have a low detection limit but may require specific conditions for cobalt determination. Liquid phase microextraction methods face limitations in terms of sample volume and complexity of experimental parameters. Analytical methods based on mass transfer and complexation for cobalt determination in urine samples show promising results but may still have challenges related to the extraction process and detection limits. These limitations highlight the ongoing need for further advancements in cobalt detection methodologies.
How does the phytochemical screening test 10% NaOH test affect the colour?5 answersThe phytochemical screening test using 10% NaOH does not have a direct effect on color, as mentioned in the abstracts. However, various phytochemical tests based on color reactions or precipitation can be used to detect the presence of specific chemical groups in plant extracts. These tests can provide information about the phytochemical constituents, including carbohydrates, proteins, phenolic compounds, alkaloids, flavonoids, saponins, tannins, and glycosides. The presence of alkaloids can be indicated by the occurrence of a brown-reddish precipitate when Wagner reagent is added to the extract. The presence of carbohydrates can be confirmed by a blue color when iodine solution is treated with the extract, or by the formation of red precipitates when Fehling solution is boiled with the extract. The presence of proteins can be indicated by a violet ring at the junction when alcoholic α-naphthol is treated with the extract.
What is the importance of colorimetric detection of glucose?5 answersColorimetric detection of glucose is important for several reasons. Firstly, it offers a convenient and practical method for monitoring blood glucose levels, which is essential for diabetes management. Secondly, colorimetric glucose biosensors are portable, inexpensive, and can be used for daily assessment of glucose levels without the need for sophisticated instrumentation. Thirdly, nanozyme-based colorimetric detection has shown high sensitivity, stability, and adjustable catalytic activities, making it a promising approach for glucose monitoring. Additionally, colorimetric wearable biosensors have the potential to measure glucose levels non-invasively during exercise, providing a valuable tool for diabetic athletes. Furthermore, colorimetric detection systems using nanomaterials have demonstrated multiple-color changes, enabling easy observation with the naked eye and expanding the possibilities for colorimetric experiments. Overall, colorimetric detection of glucose offers simplicity, low-cost, and convenience, making it a valuable tool for monitoring and managing diabetes.
How to detect protein-protein interactions with fluorescent probes?5 answersProtein-protein interactions can be detected using fluorescent probes. One method is the proximity ligation assay (PLA), which visualizes endogenous protein-protein interactions at the single molecule level. Another approach is the use of anti-GFP affinity matrices in proteomics protocols, which allows for the detection of interactions using fluorescently-tagged proteins. Additionally, solvatochromic HaloTag probes can be used to label and track proteins within subcellular compartments, providing information about their nanoscale environments. A method involving the self-assembly of polypeptides fused to GFP fragments and the use of an intrabody specific for the complex formed can also detect protein-protein interactions. Furthermore, attaching a non-specific synthetic receptor to a specific protein binder, modified with an environmentally sensitive fluorescent reporter, enables the targeting and sensing of specific regions on protein surfaces.
What are the advantages and disadvantage of paper based molecular imprinting colorimetry sensor for amino acids?2 answersPaper-based molecular imprinting colorimetry sensors for amino acids offer several advantages. Firstly, they are low-cost, portable, and easy to use. Secondly, they have excellent recognition ability and structural stability due to the integration of molecularly imprinted polymers (MIP). This allows for the rapid, convenient, and low-cost application of molecular-imprinting analysis technology. Additionally, paper-based sensors provide a powerful discrimination, good selectivity, and rapid response. They also offer the advantage of being able to detect basic amino acids, such as arginine and lysine, in complex biological media like serum samples. However, there are some limitations to consider. The use of chemically complex sensor molecules in some systems can impede their practical applications. Furthermore, the future development of paper-based molecular imprinting colorimetry sensors for amino acids needs to address certain challenges and problems.