Colloids

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1. Which of these will increase stabilization of a colloid particle?

  • Adding the ionic strength by adding
  • Adding water soluble organic solvent (destroys the lyosphere)
  • Add a little salt (eg. increases solubility of globulins)
  • Changing the Ph to its isoelectric point for amphoteric colloid particles like proteins
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2. which is not true?

  • surfactants are compounds that increase surface tension (adhesive and cohesive forces)
  • when the monomer conc > CMC then a micelle is formed
  • there are 4 types of surfactants - anion, cationic, amphoteric, non ionic
  • Thin layer chromatography - separates substances with different affinity to 2 phases (staionary and mobile phase)

3. which of these is not a feature of a colloid?

  • Optical feature: Opalescent
  • > 500nm
  • Can be separated by electrophoresis because they often carry a charge
  • Can be seen by electric microscope
  • settles by ultracentrifugation - cannot use filtration
  • Because of their large size- they can induce light diffusion
  • Contributes to the oncotic pressure
  • Allows dialysis

4. which of these is not a way to classify Colloids?

  • Structure of colloid - Molecular (sungle large molecule eg. proteins/starch) or micellar (particles composed from smaller amphillic ones eg. soap/phospholipids
  • Organic colloids - colloid particles (eg DNA, viruses, vesicles) or colloid systems(- blood plasma, lymph, cytosol)
  • Interaction with water - hydrophobic and hydrophillic
  • Mobility of coloids eg solutions (free in their motion as in a true solution) and gel (particles arranged in a solid net e.g fibrin gel, gelatine

5. In the venule end which type of pressure is higher?

  • Blood pressure < Oncotic pressure so tissue fluid leaves the cappillaries
  • Blood pressure > Oncotic pressure so tissue fluid leaves the cappillaries
  • Blood pressure < Oncotic pressure so tissue fluid returns back into the cappillaries
  • Blood pressure > Oncotic pressure so tissue fluid returns back into the cappillaries

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