A pyrene-based ratiometric probe for nanomolar level detection of glyphosate in food and environmental samples and its application for live-cell imaging

Abstract

A reversible chromogenic probe based on pyrene-linked bispicolyl amphiphile has been utilized for ratiometric, nanomolar level (LOD: 1.3 nM) detection of glyphosate in Brij-58 micelle medium. The probe shows a...

Dye-surfactant co-assembly as the chromogenic indicator for nanomolar level detection of Cu(i) ions via a color-changing response

“…This is probably due to the stacking nature of the polyaromatic pyrene moiety. 9 The formation of aggregates of 1 , owing to π-stacking and hydrogen bonding interactions, has already been reported by Bhattacharya et al Here also, we independently probed the self-assembly process by various spectroscopic studies and DLS experiments (Fig. S1–S3, ESI†).…”

Improved Analytical Performance of an Amphiphilic Probe upon Protein Encapsulation: Spectroscopic Investigation along with Computational Rationalization

“…33−35 Pyrene has been chosen as the fluorophore of interest due to notable characteristics, including large photostability, long fluorescence decay time, and a propensity to dimerize and self-associate (formation of excimers). 36,37 However, the possible photoinduced electron transfer from the pyrenylic nitrogen (PyCH 2 -N) to the excited pyrenyl (Py*) chromophore is expected to lead to a quenching of emission since the deactivation of the excited state will proceed through a radiationless process. 38 However, owing to three primary nitrogen centers, bpa-based fluorescence probes have often been employed in constructing several sensors for transition metal ions and pH.…”

“…The molecule under consideration here is a bifunctional PET sensor, (1-pyrenyl)­methyl-bis-[(2-pyridyl)­methyl]­amine ( Pybpa ), composed of two distinct modules, bispicolyl as a binding site and pyrene as the signaling moiety. The compound was synthesized in a facile manner by coupling pyrenylmethyl chloride with the metal ion binding bis-[(2-pyridyl)­methyl]­amine ( bpa ) unit. − Pyrene has been chosen as the fluorophore of interest due to notable characteristics, including large photostability, long fluorescence decay time, and a propensity to dimerize and self-associate (formation of excimers). , However, the possible photoinduced electron transfer from the pyrenylic nitrogen (PyCH 2 - N ) to the excited pyrenyl (Py*) chromophore is expected to lead to a quenching of emission since the deactivation of the excited state will proceed through a radiationless process . However, owing to three primary nitrogen centers, bpa -based fluorescence probes have often been employed in constructing several sensors for transition metal ions and pH. , Such recovery of fluorescence signal via metal ion/ H + coordination is often termed chelation-enhanced fluorescence (CHEF).…”

Exploring Various Photochemical Processes in Optical Sensing of Pesticides by Luminescent Nanomaterials: A Concise Discussion on Challenges and Recent Advancements

“…53 To prevent such grave concerns, it has become compulsory to monitor and control the use of pesticides. In this respect, nanomaterials have greatly been utilized in the selective and sensitive detection of pesticides, 54,55 and it is essential to mention the maximum residue limit (MRL) of some pesticides in different categories of foods and nutrients. The Agency for Toxic Substances and Disease Registry under the United States Department of Health and Human Services has guidelines for the maximum permissible concentrations of methyl parathion in different foods and different age groups like 1 μg•mL −1 in rice, 0.3 μg•mL −1 for short-term exposure of children in drinking water, and 0.002 μg•mL −1 for lifetime exposure of adults.…”