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Related Concept Videos

Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
30.0K
Alkali Metals03:06

Alkali Metals

24.2K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.2K

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Bacterial Detection & Identification Using Electrochemical Sensors
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Identification of Several Toxic Metal Ions Using a Colorimetric Sensor Array.

Gülsu Şener1, Adil Denizli2

  • 1Department of Chemistry, Hacettepe University, Ankara, Turkey.

Methods in Molecular Biology (Clifton, N.J.)
|July 17, 2019
PubMed
Summary

A new colorimetric sensor array detects multiple toxic heavy metal ions in water. This sensor uses gold nanoparticles and amino acids to create unique color patterns for each metal, aiding water quality monitoring.

Keywords:
Colorimetric assaysEnvironmental monitoringGold nanoparticlesSensor arrayToxic metal ions

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Toxic heavy metal ion contamination in water poses a significant global environmental and health risk.
  • Effective monitoring of these pollutants is crucial for safeguarding water resources and public health.

Purpose of the Study:

  • To develop a simple and effective colorimetric sensor array for the simultaneous detection of multiple toxic heavy metal ions in water.
  • To utilize gold nanoparticles functionalized with amino acids for a novel sensing approach.

Main Methods:

  • Fabrication of a sensor array using 11-mercaptoundecanoic acid (MUA)-capped gold nanoparticles (AuNPs).
  • Incorporation of five amino acids (lysine, cysteine, histidine, tyrosine, arginine) to modulate AuNP aggregation.
  • Observation of color changes in the sensor array due to metal ion-induced aggregation.

Main Results:

  • The sensor array successfully detected multiple toxic heavy metal ions including mercury (Hg2+), cadmium (Cd2+), iron (Fe3+), lead (Pb2+), aluminum (Al3+), copper (Cu2+), and chromium (Cr3+).
  • Amino acids influenced the aggregation of MUA-capped AuNPs in the presence of different metal ions.
  • Unique colorimetric response patterns were generated for each specific metal ion, enabling simultaneous detection.

Conclusions:

  • A straightforward colorimetric sensor array based on functionalized gold nanoparticles and amino acids offers a promising method for simultaneous detection of various toxic heavy metal ions.
  • This approach provides a visual and unique fingerprint for each metal ion, facilitating rapid water quality assessment.
  • The developed sensor system contributes to the critical need for accessible and efficient tools for monitoring water pollution.