Term
| Hydrophilic Colloids Classification |
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Definition
1. Plant hydrocolloids
2. Animal hydrocolloids
3. Modified plant derivatives
4. Inorganic clays
5. Synthetic hydrocolloids |
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Term
Plant hydrocolloids
(hydrophylic) |
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Definition
1. Acacia (neg charged, most often used)
2. Tragacanth (neg charged, 10 times more viscous than acacia)
3. Algins (neg charged, derivatives of alginic acid - from seaweeds) |
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Term
Animal hydrocolloids
(hydrophilic) |
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Definition
1. Gelatin
2. Pharmagel-A (+ charged) and B (- charged)
3. Egg yolk
4. Casein (milk) |
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Term
Modified plant derivatives
(hydrophilic colloids) |
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Definition
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Term
Inorganic clays
(hydrophilic colloids) |
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Definition
1. Bentonite (neg charge, basic pH)
2. Veegum (neg charge, basic pH)
3. Silicates (in his lecture): neg charge, basic pH |
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Term
Synthetic hydrocolloids: neg charge compd
(hydrophilic colloids) |
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Definition
| Carbopol-934 (Carboxy-vinyl polymer) |
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Term
| Is pharmagel A compatible with acacia? |
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Definition
| No, because pharmagel A is positive charged while acacia is negative charged. Pharmagel B is compatible with acacia |
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Term
Amphiphilic colloids
(association colloids) |
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Definition
1. Span (non-ionic, lipophilic)
2. Tweens (non-ionic, hydrophilic)
3. Brijs (~span)
4. Myrjs (~tween)
5. PEG derivatives (~span)
6. Glyceryl derivatives (~span)
7. Propylene glycol derivatives (~span)
8. Sulfates (~span but neg charge e.g. Sodium Lauryl Sulfate)
9. Quaternary ammonium derivatives (~tween but pos charge) |
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Term
| Some commercial non-medicated ointment bases |
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Definition
1. Hydrocarbon (oleaginous) base
2. Absorption bases
3. Emulsion bases w/o
4. Emulsion bases o/w
5. Water soluble bases
6. Silicone bases |
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Term
| Example of hydrocarbon (oleaginous base)? |
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Definition
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Term
| Example of absorption bases? |
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Definition
1. Almacone
2. Eucerin
3. Aquaphor
4. Plastibase-hydrophilic
5. Polysorb
6. Nivea cream
7. Lanolor
8. Hydrotex |
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Term
| Example of emulsion bases w/o? |
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Definition
1. Hydrocream
2. Eucerin
3. Nivea cream |
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Term
| Example of emulsion bases o/w? |
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Definition
1. Velachol
2. Almay
3. Cetaphil
4. Dermabase
5. Dermovan
6. Neobase
7. Unibase
8. Phorsix |
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Term
| Example of water soluble bases? |
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Definition
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Term
| Example of silicone bases? |
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Definition
1. Convicone
2. Domicone
3. Silicone
4. Kerodex |
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Term
| Quaternary Ammoxium derivatives (pos charge) |
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Definition
hydrophilic (~tween) but pos charge
4 R grps and 1 grp has to be C18 to have HLB balance
Emulsified property but used as antibacterial agent e.g. benzyl chronium chloride
Chelating agents: chelate with neg grp like soap |
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Term
| Are all plant hydrocolloids negatively charged? |
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Definition
| Yes, plant (carbohydrate) colloids such as acacia, tragacanth, and algins are negatively charged. |
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Term
| Do inorganic clays need preservative? |
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Definition
| INORGANIC clays are negative charge (basic pH) so do not need preservative |
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Term
| Is carbopol-934 (carboxy-vinyl polymer) natural or synthetic |
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Definition
| It is a synthetic hydrocolloid. It is similar to CMC with neg charge. It has COOH group. CMC - Carboxy Methylcellulose |
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