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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Isomerism in Complexes
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Drug-receptor bonds are formed through various chemical forces when drugs interact with target cells. Covalent bonds, strong and irreversible, are exemplified by DNA-alkylating anticancer agents that inhibit cell division. However, such irreversible drug binding lacks selectivity and can modify the DNA of the surrounding healthy cells. Covalent binding often contributes to tissue toxicity, as seen with chloroform and paracetamol metabolites binding to the liver, causing hepatotoxicity.
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An iron silicate based pH-sensitive drug delivery system utilizing coordination bonding.

Pengxin Liu1, Mei Chen, Cheng Chen

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This study introduces hollow iron silicate nanospheres for targeted cancer drug delivery. These nanospheres efficiently release anticancer drugs into cancer cells triggered by acidity, showing superior cancer cell killing effects.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Drug delivery systems are crucial for effective cancer therapy.
  • Iron silicate nanostructures offer potential for advanced drug carriers.
  • Targeted drug release mechanisms are needed to improve efficacy and reduce side effects.

Purpose of the Study:

  • To develop and characterize hollow iron silicate nanospheres for drug delivery.
  • To investigate the pH-triggered release of doxorubicin (DOX) from these nanospheres.
  • To evaluate the efficacy and cytotoxicity of the DOX-loaded nanospheres in cancer cells.

Main Methods:

  • Synthesis of hollow iron silicate nanospheres.
  • Loading of doxorubicin (DOX) onto the nanospheres.
  • In vitro studies on pH-triggered drug release.
  • Cell-based assays to assess cytotoxicity and cellular uptake.
  • Confocal laser scanning microscopy (CLSM) for visualizing drug release and localization.

Main Results:

  • Iron silicate nanospheres demonstrated a high drug loading capacity (up to 50.2% by weight).
  • Doxorubicin release was effectively triggered by acidic conditions, mimicking the intracellular environment of cancer cells.
  • DOX-loaded nanospheres showed enhanced cancer cell killing efficiency compared to free DOX.
  • Higher cytotoxicity was observed against human hepatoma cells than normal hepatocytes.

Conclusions:

  • Hollow iron silicate nanospheres represent a promising platform for targeted cancer drug delivery.
  • The pH-sensitive nature of the nanospheres enables controlled drug release within cancer cells.
  • This system offers potential for improved therapeutic outcomes in cancer treatment.