isoelectric

isoelectric

A scientist measures the isoelectric point of a protein solution.

Definition
  1. Adjective:
    • Having equal electric potential: "isoelectric" describes a state or condition in which an object, system, or solution has no net electric charge or potential difference, often used in physics and chemistry to refer to a point where the positive and negative charges balance.
    • Pertaining to the isoelectric point: In biochemistry, "isoelectric" specifically refers to the pH at which a molecule (such as a protein or amino acid) carries no net electrical charge, known as the isoelectric point (pI).
Usage Examples
  • Adjective:
    • The isoelectric point of this protein is pH 5.2. (The pH at which the protein has no net charge.)
    • At the isoelectric state, the molecule does not migrate in an electric field. (The molecule has balanced charges and thus no movement.)
Advanced Usage

  • "Isoelectric focusing": a technique used in biochemistry to separate molecules based on their isoelectric points.

    • Isoelectric focusing is a powerful method for purifying proteins. (A laboratory procedure that uses the isoelectric property to separate substances.)

  • "Isoelectric line": in electrocardiography, the baseline or zero-voltage line on an ECG recording.

    • The isoelectric line represents the absence of electrical activity in the heart muscle. (The flat line on the ECG trace.)
Variants and Related Words

  • Isoelectric point (noun phrase): the specific pH value at which a molecule has no net electric charge.

    • The isoelectric point of amino acids varies with their side chains. (The pH where the amino acid is neutral.)

  • Isoelectricity (noun): the property of being isoelectric.

    • Isoelectricity is crucial for understanding protein solubility. (The condition of having equal charge.)
Synonyms
  • Electroneutral: having no net electrical charge.
  • Zeropotential: at zero electric potential (less common).
Related Idioms
  • At the isoelectric point: used figuratively in scientific contexts to mean a state of balance or equilibrium.
    • The solution is at the isoelectric point, so no ions migrate. (The charges are perfectly balanced.)