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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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Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Extraction: Advanced Methods00:56

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Polyamines: Rising stars against metal and metalloid toxicity.

Shalu Gupta1, Krishan Kant1, Navneet Kaur1

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Polyamines (PAs) mitigate metal/metalloid toxicity in plants by chelating ions and modulating stress responses. Their signaling roles and interactions with other hormones are key to plant survival under heavy metal stress.

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Area of Science:

  • Environmental Science
  • Plant Biology
  • Biochemistry

Background:

  • Metal/metalloid soil contamination poses a global threat to agriculture and ecosystems.
  • Excessive metal ions induce oxidative stress and ion imbalance, impairing plant growth.
  • Plants have evolved defense mechanisms like hyperaccumulation and chelation.

Purpose of the Study:

  • To review the role of polyamines (PAs) in plant responses to metal/metalloid stress.
  • To elucidate how PAs and their catabolic products (H₂O₂, GABA) act as signaling molecules.
  • To focus on specific metalloids: arsenic (As), boron (B), cadmium (Cd), chromium (Cr), and zinc (Zn).

Main Methods:

  • Literature review synthesizing current research on polyamines and metal/metalloid stress.
  • Analysis of polyamine-mediated regulation of genes and enzymes.
  • Examination of polyamine interactions with plant hormones and stress response pathways.

Main Results:

  • Polyamines chelate toxic metal ions, reducing their cellular accumulation.
  • PAs modulate antioxidant capacity, stomatal closure, and the synthesis of metal-binding proteins (phytochelatin, metallothionein).
  • PA catabolites like H₂O₂ and GABA act as crucial signaling molecules under stress.

Conclusions:

  • Polyamines are vital regulators of plant adaptation to metal/metalloid stress.
  • Multifaceted strategies involving PAs are essential for mitigating heavy metal toxicity in agriculture.
  • Understanding PA signaling pathways offers potential for developing stress-resilient crops.