scholar.cu.edu.eg title: slide 1 author: dr. ahmed hassan created date: 12/9/2019 6:23:54 pm
TRANSCRIPT
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Pharmaceutical Aerosols & Sprays
(Pressurized Packages)
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• An aerosol or pressurized package may be
defined as " a system that depends on the
power of a compressed or liquefied gas to
expel the contents from the container".
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Pharmaceutical Aerosols & Sprays
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Advantages over other dosage forms:
1. A dose can be removed without contamination of
remaining material.
2. Greater stability for substances senstive to oxygen
and / or moisture.
3. The medication can be delivered directly on the
affected area in a desired form
4. Irritation produced by the mechanical application of
topical medication is reduced or eliminated.
5. Ease and convenience of application of medication
in a thin layer.
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Disadvantages of Pressurized Delivery Systems
1.Expensive
2. Limited safety hazard
• Flammable
• Pressurized
Precautions: DO NOT
• Spray on a naked flame (protect from sunlight).
• Inhale (except those intended for medical purposes).
• Pierce or burn.
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Aerosol
Space
sprays.
Coating
sprays.Foams. Streams
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1- Space sprays : dispense the products as finely
divided sprays in which the particles are less
than 50 microns in diameter.
• It is intended that the particles remain
suspended in air for a time.
• Examples: insecticides and room deodorants.
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2- Surface – coating aerosols:
• The intention is to deposit the
particles directly on a surface rather
than in the air.
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• Produce sprays with particles somewhat larger
than those produced by space aerosols.
Examples: residual insecticides, paints.
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3- Foam aerosols
The product is delivered from the valve of the pressurized package in the form of foam aerosols are used principally for personal products as shaving creams, and lotion.
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4- stream aerosolsThe product is expelled form the
pressurized package in the form of a
simple stream. Examples: hand lotions.
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Mode of Operation
Liquefied gassystem
(Propellants)
Two phase system
Three phase system
Compressed gas
system
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When a liquefied gas propellant
is sealed with an aerosol
container, a portion of it
vaporizes and the remainder
exists as liquid.
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1- Liquefied Gas Systems:
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A-Two phase system
The liquid phase may be
composed of :
1. solution of AC:
• in propellant or
• in mixture of propellant
and a solvent if a solvent
is necessary.
2. Suspension of AC in
propellant ᴉ3. Emulsion (foam).
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B- Three – Phase systems
• The aqueous product is not miscible with the propellants, it forms a separate layer.
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2- Compressed Gas – Systems
• It is a pressure of the gas in the head space of theaerosol which expels the product from the package.
• Pressure in these aerosols decreases as the productsare dispensed.
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Propellants
• Responsible for developing the pressure within the
container
• Expel the product when the valve is opened.
• Serve as solvents, suspending agents or diluents.
• Affects the properties of the product as it leaves the
package.
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Propellants
1- Liquefied Gas Propellants• Liquid gas propellants, mostly chlorinated, fluorinated
hydrocarbons, have been used in refrigeration units for a
number of years. They are well suited as propellants and as
refrigerants due to their low BP and low vapor pressures.
• Each propellant has a definite vapor pressure at a given
temp., therefore we can select a propellant to give the
desired pressure in an aerosol.
• If a single propellant does not give the desired pressure,
two propellants can be blended to obtain a mixture which
will produce the desired pressure at a given temp.
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PropellantsHydrocarbons Chlorofluorocarbons Hydrofluroalkanes
(HFA)
1. Cost Low High High
2. Ozone depletion Minimal Destructive to
atmospheric Ozone
No ozone depletion
3. Green house effect Negligible Contribute to
“greenhouse effect”
-
4. Toxicity Highly Toxic Low Low
5.Chemical stability High High
6. Solvent effect Excellent CFC-11 is a good
solvent
Poor
Most common
But Flammable
Used only in
inhalation aerosols
-
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XYZ
11CCl3F
12CCl2F2
114CClF2CClF2
115CClF2CF3
C318CF2CF2CF2CF2
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•All propellants are designated by
three digits. XYZ
X = Number of carbon atoms – 1
Y = Number of hydrogen atoms + 1
Z = Number of fluorine atoms
•if X is zero, it is omitted and a two
digit number is used.
•A capital C before a number
indicates the cyclic nature of a
compound.
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* psia = pounds per square inch absolute (psig + 14.7)
• Propellant 11 cannot be used in packaging
products that contain H2O or Ethanol
because free HCL may form, causing
corrosion of metal containers.
• Propellant 12 and 114 are relatively stable
in the presence of water and alcohol.
• propellant C318 posses extreme chemical
stability with these liquids.
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The vapor pressure of pure propellant 11 (MW
137.4) is 13.4 psi and that of propellant 12 (MW
120.9) is 84.9 psi. Calculate the total pressure
in (psi and psig) of 100 g mixture from these 2
propellants with 1:1 ratio
The total pressure = partial pressure of A + partial pressure of B
• Partial pressure = mole fraction x vapor pressure
MW
gmweigtmoleofNo
moleofNomoleNo
moleofNofractionmole
BA
AA
)( .
. .
.
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Aerosols and Rault's law
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psixpressurep
psixpressurep
fractionp
fractionp
molesp
molesp
2.459.84532.0
27.64.13468.0
532.0414.0364.0
414.0
468.0414.0364.0
364.0
414.09.120
50
364.04.137
50
12
11
12
11
12
11
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• Total vapor pressure of the mixture =
6.27 + 45.2 = 51.5 psi
To convert to psig we have to subtract
the atmospheric pressure of 14.7 psi.
51.5 – 14.7 = 36.8 psig
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II- Compressed Gas Propellants:DisadvantagesAdvantages
•Require use of a
nonvolatile co-solvent
•Produce coarse droplet
sprays
•Pressure falls during use
•Low inhalation toxicity
•High chemical stability
•High purity
•Inexpensive
•No environmental problems
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Compressed Gas - Physical Properties
N2ONitrogenCO2Property
NoneNoneNoneFlammability
limits in air
slightlyInsolubleslightlyAqueous
solubility
Depends on
fill
Depends
on fill
Depends on
fill
Vapor pressure
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Compressed gas
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Nitrogen (Insoluble):-The dispensed product have the same consistency as
before packaging.
-Must be packaged at higher pressure than aerosols
prepared with liquefied gas because of the pressure
drop during use (Nitrous oxide and Carbon dioxide are
the same but to lesser extent)
-Nitrogen is the best choice for products liable to
oxidation.
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Containers
They must withstand pressure in the range of
140 – 180 psig.
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• Can Base
The curved shape of the can’s base
1. counters the pressure of the
propellant inside.
2. creates a “valley” so that all
product can be reached by the
dip tube.
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ContainersMetal Glass Plastic
Examples Tin plated steel
Aluminium
stainless steal
Acetal resin
(Delrin),
polymeric amides
(Nylon), and
acetyl copolymer.
Advantage Strong so they can
withstand high
pressure
•One can see the product inside•Easily shaped•Does not interact with the ingredients•Not subjected to corrosion.
Unbreakable
Disadvantage • One can not see
the product inside
• Can interact with
some ingredients
It is easily breakable.
therefore, glass can be
protected by using
metal shell or plastic
coating
•May interact
with some
ingredients.
•May permeate
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• Plastic coating of glass containers serve
as:
-- cushion impacts if the bottles are dropped.
-- container for the broken glass and the
aerosol content if the impact was hard.
In this case, the gas causes the plastic to
balloon.
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Valves
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Valve
Continuous Spray Valve
Metering Valves
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Continuous Spray Valve-1
• An aerosol valve consists of many
different parts, these parts are:
I- Mounting Cup:
The mounting cup is used to attach the
valve to the container.
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• II- Housing and stem:
• It is manufactured
from Nylon or Delrin.
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• III- Gasket (ring):
• It is manufactured from Buna-N
or Neoprene rubber. The gasket
serves to seal the stem
openings when the valve is
closed.
• IV- Spring:
• The spring serves to hold the
gasket in place and when
actuator is depressed and
released, the gasket will return
the valve to its closed position.
• Springs are commonly
manufactured from stainless
steal.36
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• V- Dip Tube:
• It is made ofpolyethylene orpolypropylene
• Larger diameter of diptube is used for moreviscous preparations.
• Its length is veryimportant especiallyin 3-phase aerosolsystem.
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• The length of the dip
tube is such that the
tube dips into the
aqueous product
and not the
propellant.
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2- Metering Valves
• Metered valves are applicable to the
dispensing of potent medications.
These valves deliver measured amount
of aerosol mixture with each actuation.
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2- Metering ValvesSteal Ball
A) The dip tube may contain a steel ballwhich operate between a lower stopand a ball valve seat at the upper level.
B) When the valve is actuated, the fastflowing stream of product carries theball up in the dip tube until the ballseats in the upper valve seat.
C) When the actuator is released the ballreturns to its lower positioning the diptube.
D) The volume between the lower stopand the upper ball valve determines thequantity of spray per dose.41
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Actuators• The actuator allows for easy opening and closing of the
valve.
• It also serves to aid in producing the required type of
product discharge.
• There are different types of actuators.
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Actuators 1- Spray Actuators
• Actuators for spray aerosols are capable of dispersing thestream of product concentrate and propellant inrelatively small particles by allowing the stream to passthrough various openings.
2- Foam Actuators: consist of large orifices.
3- Stream actuators: have relatively large orifices similar tothat of foam actuators.
4- Special actuators:
• Specially designed to deliver the medication to theappropriate site of action (throat or nose).43
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Protective caps
• Protective caps are necessary to protect the
valve and actuator during storage and
transportation.
• They are made of metal or polyethylene.
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Filling Operations1- Cold Filling:
For liquefied gas propellants.
• First cool the container.
• Cool the drug concentrate and the propellant till liquefied
till –40 0C by using dry ice (solid CO2).
• Fill the drug concentrate quantitatively
• Fill the liquefied gas quantitatively
• Immediately fix the valve and seal it
Advantages:
Economic
No air entrapment within package
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Disadvantages:•Not for aqueous preparations (will freeze)
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.Pressure Filling Method2
• For liquefied gas Propellants
1- Fill the drug concentrate
2- Fix the valve.
3- Fill the gas or the liquefied propellant using
pressure by pumping.
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Formulation of aerosols
• Drug concentrate: Solution or suspension.
• Propellant: Liquefied or compressed gas
• Valve and actuator: modified to change
droplet size.
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• 1- Solutions:
• Product concentrate is a solution of active ingredient in
single propellant, propellant blend or propellant and
other solvent.
• Propellant 12 has very high V.P:
needs metal container.
If used alone very fine spray product.
If mixed with other propellants or non volatile solvents,
coarser droplets and lower V.P
no need for metal containers.
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Water Based System
• If the propellant is immiscible with water, so 3-
phase system will appear.
Conversion into 2-phase system:
• Make emulsion of the propellant with water.
• Make the propellant miscible by
1- Co-solvency (ethyl alcohol)
2- Surfactant (Spans: 0.5- 2.0%)
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2- Suspensions
• Suspend the drug in a propellant and
SAA or Suspending agent.
• In this case, no need for cosolvents
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Formulation of Foam System
1- Stable Foam:
• The foam system is an emulsion.
• Use liquefied system (8-10%) propellant in
the internal phase.
Increase propellant 12 ratio gives stiff foam.
2- Quick breaking foam:
• Use liquefied propellant in the external phase
of the emulsion.
• Mainly for topical preparations.51
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Inhalation Aerosols
Three main types of aerosol generating device
for use in inhaled drug therapy:
1. Metered-dose inhalers (MDIs).
2. Dry powder inhalers (DPIs)
3. Nebulizers.
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Metered-dose inhalers (MDIs).
• Metered-dose inhalers (MDIs), introduced in the mid-1950s
• drug is either dissolved or suspended in a liquid propellant mixture.
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• There is no dip tube (metered dose inhalers MDIs) the
container is used in the inverted position so that the
liquid phase is in direct with the valve.
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Advantages of MDIs
1. Their portability
2. low cost
3. dose delivery is reproducible.
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Incorrect use by patients as:
• Failure to remove the protective cap covering the mouthpiece.
• Failure to shake the canister
• Failure to inhale slowly and deeply.
• Poor inhalation/actuation synchronization.
• Inadequate breath-holding.
Disadvantages of MDIs:
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How to overcome the synchronization
problem?
• Spacer :
• It is a cylinder that has a mouth piece at one end and a fitting at the other end.
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Advantages:
1. Reduce the need for optimal coordination thusimproving delivery of drugs to the lungs.
2. Useful for young children, children unable to useMDI and patients with coordination problems.
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Dry powder inhaler (DPI)
The drug is either:
1. preloaded in an inhalation device (Turbohaler)
2. or filled into Hard gelatin capsules (cap. inhaler)
3. or foil blister discs (Discus)
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Disadvantages:
1. Liberation of powders from the device and is
limited by the patient's ability to inhale, which in
the case of respiratory disease may be impaired.
2. Elevated humidity cause powders to clump.
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Advantages:
1. DPI formulations are propellant free.
2. do not contain any excipients, other than a carrierwhich is almost lactose.
3. They are breath actuated, avoiding the problems of inhalation/actuation coordination encountered with MDIs,
4. useful for young children
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Diskus inhaler
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Diskus inhaler
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Nebulizers
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A nebulizer makes an aerosol by blowing air or oxygen through adrug solution e.g. albuterol, beclomethasone, and cromolynsodium.The aerosol is delivered through a face mask or a mouthpiece.
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Advantages:
1. Nebulization is effective because it allows highdoses of drugs to be inhaled without any specialeffort to coordinate breathing.
2. Nebulized bronchodilators are particularly helpfulin the acutely breathless patient both at home andin hospital, young children and patients onventilators.
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Evaluation parameters of pharmaceutical aerosolsA. Flammability and combustibility
1. Flash point.
2. Flame extension.
B. Physiochemical characteristics
1. Vapor pressure
2. Density
3. Moisture content
C. Performance
1. Aerosol valve discharge rate
2. Spray pattern
3. Dosage with metered valves
4. Net contents
5. Foam stability
6. Particle size determination.
Quality Control
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1. Flame Extension
Done by spraying the product for 4 seconds into a flame.
The flame will be extended.
The exact length of the extended flame is measured by a ruler.
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2-Flash point
Determined by chilling the product to a temperature of -25°F
and transfer the product to the test apparatus, then increase the
temperature slowly.
The temperature at which the vapor ignites is taken as the
flash point.
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Measured with a pressure gauge
Excessive variation in pressure indicates
the presence of air in the head space.
2. Density: Determined by the use of a
hydrometer or a pycnometer
3. Moisture content: measured by Karl
Fishcer method or gas
chromatography.
1. Vapor pressure:
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1. Aerosol valve discharge rate
Discharging the contents for a given period of time using a
standard apparatus.
By reweighing the container, the change in weight per time is
the discharge rate (gram/second or gram/minute).
Example:
Initial weight = 100 gm.
after 10 minutes of discharge → weight = 80 gm.
discharge rate = (100 - 80) / 10 = 2 gm/minute
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2. Spray pattern Spray pattern is based on spraying the aerosol on a piece of paper
coated with a dye-talc mixture.
The dye goes into solution and is absorbed onto the paper This
will give a record of the spray (finger print) which can be used for
comparison purposes.
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3. Dosage with metered valves
a. Assay technique: where one or two doses are dispensed
into a solvent and the solution is assayed to determine
the drug content.
b. Another method:
Dispensing several doses.
The container is then reweighed
The difference in weight is divided by the number of doses
dispensed to give the average dose.
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4. Net contents
A full container is weighed and then all its contents are
dispensed & reweighed.
5. Foam stability
1. Visual evaluation
2. Time for a given rod that’s inserted into the foam to fall.
3. By the use of a rotational viscometer.
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6. particle size determination:
Cascade impactorA series of nozzles and glassslides.The large particles becomeimpacted first.The smaller particles pass on andare collected at high velocitystages.
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Thank You
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