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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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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pH Homeostasis01:31

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Acid-base homeostasis is essential for maintaining normal physiological activities in humans. The pH of various body fluids is strictly regulated because it is critical for the optimal activity of enzymes involved in metabolic reactions. Enzymes are basically proteins, so, any significant change in pH can affect their structure and activity. In humans, pH is regulated using three primary mechanisms— chemical buffer systems, respiratory regulation, and renal regulation.
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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
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Protein Buffers in Blood Plasma and Cells01:20

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The human body utilizes protein buffer systems to maintain a stable pH. These systems capitalize on the dual role of amino acids, which can act as acids or bases by accepting or releasing hydrogen ions in response to pH changes. Protein buffer systems are particularly significant in the extracellular fluid (ECF) and intracellular fluid (ICF) of active cells, where structural and functional proteins provide substantial buffering capacity.
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The ionization-constant expression for a solution of a weak acid can be written as:
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Related Experiment Video

Updated: Jun 5, 2025

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
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pH-dependent cadmium binding to hemoglobin: Implications for human excretion.

Min Yuan1, Qiying Nong2, Hua Guo3

  • 1State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.

The Science of the Total Environment
|December 10, 2024
PubMed
Summary
This summary is machine-generated.

Lowering blood pH can release cadmium (Cd) from red blood cells by reducing its binding to hemoglobin (Hb). This strategy may enhance the body's natural excretion of toxic cadmium.

Keywords:
Binding affinityBlood cadmiumExcretionHemoglobinpH dependent

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Area of Science:

  • Toxicology
  • Biochemistry
  • Environmental Health

Background:

  • Cadmium (Cd) has a long half-life in human organs (30 years) but a shorter one in blood (3-4 months).
  • Reducing the body's cadmium burden is critical, with blood Cd elimination being a key step.
  • Currently, effective methods to promote cadmium elimination from blood are lacking.

Purpose of the Study:

  • To investigate the distribution and binding of cadmium in blood.
  • To explore the role of pH in cadmium-hemoglobin interactions.
  • To identify potential strategies for enhancing cadmium excretion from blood.

Main Methods:

  • Analysis of cadmium distribution in blood cells and serum from occupationally exposed workers.
  • Identification of cadmium-binding proteins using biochemical techniques.
  • Investigation of pH effects on cadmium binding to hemoglobin (Hb) in vitro.
  • Cellular experiments to assess cadmium release from blood cells under varying pH conditions.

Main Results:

  • Over 98% of blood cadmium was found concentrated in blood cells, primarily bound to hemoglobin (Hb).
  • Decreased pH significantly reduced cadmium's binding capacity and available binding sites on Hb.
  • Lowering blood pH promoted the release of cadmium from blood cells into the serum.

Conclusions:

  • Hemoglobin is the main cadmium-binding protein in blood cells.
  • Blood pH is a critical factor influencing cadmium-hemoglobin binding.
  • Manipulating blood pH presents a potential therapeutic strategy to enhance cadmium excretion and reduce body burden.