Things we should just know Flashcards

(30 cards)

1
Q

What are the two natural Gelling agents

A

Alginic Acid
Tragacanth

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2
Q

What are the two semi-synthetic- cellulose derivatives (Type of gelling agents)

A

Methylcellulose (Runny)
HPMC (Thicker, time release)

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3
Q

What are the synthetic Gelling agents

A

Carbomers *Neutralizer, Thickener
Poloxamers Absorbing, mostly pharmacy compound **Reverse thermal

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4
Q

What does the DLVO theory describe?

A

Estimating the stability of hydrophobic solutions

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5
Q

With regard to DLVO theory what forces of attraction predominates the repulsive forces?

A

Small distance (Primary minimum) and long distance (Secondary attraction)

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6
Q

Three ways of stabilizing a dispersed system

A

Change viscosity
Add buffer to maintain stability
Add Electrolytes for compatibility

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7
Q

What are the external phase Polar Liquids (Medium)

A

Water, Simple Syrup, Cherry

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8
Q

What are the external phase non-polar liquids (Medium)

A

Oils,Fatty Esters, hydrocarbons

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9
Q

What are the properties of structured vehicles in solutions? (High and low concentration)

A

They serve as protective colloids at low concentration while at high concentrations they are viscous inducing agents

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10
Q

What are the three flocculating agent categories we discussed with regards to suspensions

A

Electrolytes
Ionic Surfactants
Polymeric flocculating agents

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11
Q

What is an issue with the usage of polysaccharides as a viscosity modifier?

A

They increase the susceptibility to microbial growth

Acacia gum
Tragacanth
Alginates

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12
Q

What are the water soluble cellulose derivatives viscosity modifiers?

A

Methylcellulose
Microcrystalline cellulose

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13
Q

What are the Hydrated silicates viscosity modifiers?

A

Bentonite

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14
Q

What are the Acrylic acid polymer viscosity modifiers?

A

Carbopol/Carbomer

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15
Q

What are the inorganic Colloids?

A

Milk of magnesia Two phase system

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16
Q

What are the organic colloids?

A

Single phase system,Carbomer

17
Q

What is alginic acid?

A

Natural gelling agent that is prone to microbrial growth,

18
Q

What is Tragacanth?

A

Natural gelling agent that is used fora stable PH

19
Q

What is Methylcellulose?

A

Semi-synthetic cellulose derivative that maintains viscosity over wide ph range,

This makes thinner gels htough and hydrates in HOT water

20
Q

What is HPMC?

A

Makes thick boi gels
Semi-synthetic cellulose derivative gelling agent

21
Q

What is Carbomers or Carbopol?

A

Synthetic gelling agent that thickens AND requires PH neutralizers

When it gets thick it gets ph spicy

22
Q

What is Poloxamers?

A

Synthetic gelling agent that forms reverse thermal gels!

23
Q

What are colloidal gold, sulfur, and silver examples of?

A

Lyophobic colloids

24
Q

What are the 5 Viscosity modifiers for suspensions?

PWHAC

A

Polysaccharides
Water soluble cellulose derivatives
Hydrated Silicates
Acrylic acid polymers
Colloidal silicin dioxide

25
Types of bioreactors
Liquid and solid state
26
Low concentrations of phospholipids and surfactants have been shown to?
Extert a fibrillation-inhibitory effect
27
What is the sweeter than sucrose value for cyclamate?
30 times
28
What is the sweeter than surcose value for saccharin?
300x
29
What is less sweet then sugar?
Sorbitol, mannitol, aspartame
30
What is the sweeter than sucrose value for stevia?
200x