colloid

Examples of colloid in the following topics:

• Hydrophilic and Hydrophobic Colloids

  • A hydrophilic colloid, or hydrocolloid, is defined as a colloid system in which the colloid particles are hydrophilic polymers dispersed in water.
  • A hydrophobic colloid, or emulsion, is defined as a colloid system where the particles are hydrophobic polymers.
  • Since the colloid does not interact with the aqueous solvent, hydrophobic colloids are inherently unstable and generally do not form spontaneously.
  • In order for the emulsion to stay stable, additional substances are needed to stabilize the colloid.
  • An emulsifier is a substance that stabilizes the colloid so that it does not change significantly with time.

• Plasma and Blood Volume Expanders

  • There are two main types of volume expanders: crystalloids and colloids.
  • Colloids contain larger insoluble molecules, such as gelatin; blood itself is a colloid.
  • Colloids: These solutions preserve a high-colloid osmotic pressure (protein-exerted pressure) in the blood, while this parameter is decreased by crystalloids due to hemodilution.
  • The higher osmotic pressure from colloids draws fluids inward, preventing it from leaking out into the tissues as easily, which increases intravascular blood volume.
  • Another common volume expander includes hydroxyethyl starch (HES/HAES, common trade names: Hespan, Voluven) which is considered a colloid.

• Thyroid Gland

  • These follicles contain a viscous fluid, called colloid, which stores the glycoprotein thyroglobulin.
  • The follicles produce hormones that can be stored in the colloid or released into the surrounding capillary network for transport to the rest of the body via the circulatory system.

• Bulk Flow: Filtration and Reabsorption

  • Capillary fluid movement occurs as a result of diffusion (colloid osmotic pressure), transcytosis, and filtration.

• The Role of Blood in the Body

  • Hydraulic functions, including the regulation of the colloidal osmotic pressure of blood

• Formation, Storage, and Release of Thyroid Hormones

  • This enlarged endemic colloid goiter has the effect of increasing the thyroid's ability to trap more iodide, compensating for the iodine deficiency and allowing it to produce adequate amounts of thyroid hormone.

• Medical Solutions: Colligative Properties

  • Discuss the importance of colloidal properties in the use of medical solutions

• Capillary Dynamics

  • Oncotic, or colloid osmotic, pressure is a form of osmotic pressure exerted by proteins in the blood plasma or interstitial fluid.

• Terpenes

  • It occurs as a colloidal suspension called latex in a number of plants, ranging from the dandelion to the rubber tree (Hevea brasiliensis).

• Physical Characteristics and Volume

  • Albumin is the main protein found in plasma, and it functions to regulate the colloidal osmotic pressure of blood.