Dendrimers are highly branched macromolecules that were introduced in 1984 by Donald Tomalia. They have three distinguishing architectural components - an initiator core, interior layers, and terminal functionalities. Dendrimers can encapsulate guest molecules either physically or through chemical interactions, making them promising candidates for drug delivery applications. Their well-defined structure allows for controlled functionalization and targeted delivery of drugs.
Dendrimers may be defined as synthetic three-dimensional hyper branched, globular macromolecule, which is characterized by its highly branched 3D structure that provides a high degree of surface functionality.
Colloidal particles ranging in size between 10 & 1000 nm are known as nanoparticles.
SLNs are new generation of submicron sized lipid emulsion where the liquid lipid(oil) has been substituted by a solid lipid.
Example: Capture - Dior
Sr no Contents
1 Introduction
2 Advantages and disadvantages
3 Types of nanoparticle
4 Classification of Nanoparticle
5 Polymers used in nanoparticles
6 Method of preparation
7 Evaluation of nanoparticles
8 Application of nanoparticles
9 References
Nanoparticles is derived from the Greek word Nano means extremely small.
Nanoparticles are sub Nano sized colloidal drug delivery systems .
Particle size ranges from 10-1000 nm in diameter .
They are made up of natural, synthetic or semi synthetic polymers carrying drugs or proteinaceous substances, i.e. antigen(s) .
Drugs are entrapped either in the polymer matrix as a particulates or solid solutions or may be bound to particle surface by physical adsorption or by chemical reaction.
Drug can be added during preparation of nanoparticles or to the previously prepared nanoparticles
Nanoparticles can act as controlled release system depending on their polymeric composition.
As a targeted drug carrier nanoparticles reduce drug toxicity
Less amount of dose required.
They enhance aqueous solubility of poorly soluble drug therefore increase its bioavailability, therapeutic efficacy and Reduces side effects.
Nanoparticles can be administer by various routes including oral, nasal, parenteral, intra-ocular etc.
A) AMPHIPHILIC MACROMOLECULE CROSS-LINKING
B) Polymerization method
C)Polymer precipitation method
Heat cross-linking
Chemical cross-linking
Emulsion chemical dehydration
By Crosslinking in W/O Emulsion
PH-induced aggregation
Counter ion induced aggregation
Emulsion polymerization a)Micellar nucleation and polymerization b)Homogenous nucleation and polymerization)
Dispersion polymerization
Interfacial polymerization
Emulsion solvent evaporation method
Double emulsion and evaporation method
Solvent displacement
Salting out
Nanoprecipitation
In this presentation I have mentioned whatever the possible relevant content required for the aptamer based drug delivery.
Citation Is done at the end of slide.
Content is up to date & true to my belief.
Thanks & Best Regards.
Anurag Pandey
B.Pharm (FACULTY OF PHARMACY, INVERTIS UNIVERSITY)
M.Pharm (INSTITUTE OF PHARMACY, NIRMA UNIVERSITY)
Email :- anurag.dmk05@gmail.com
MD. ABU JAR GIFARI
Ph.D. Student
Dept. of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences
Prince of Songkla University
Hat-Yai, Songkhla, Thailand 90110
Phone: +660969247553
Email: agifari50@gmail.com
Dendrimers are nano-sized, radially symmetric molecules with well-defined, homogeneous, and monodisperse structure consisting of tree-like arms or branches.
The second group called synthesized macromolecules ‘arborols’ means, in Latin, ‘trees’. Dendrimers might also be called ‘cascade molecules’
Dendrimers are nearly monodisperse macromolecules that contain symmetric branching units built around a small molecule or a linear polymer core
‘Dendrimer’ is only an architectural motif and not a compound. Dendrimers have gained a broad range of applications in supra molecular chemistry, particularly in host-guest reactions and self-assembly processes.
Dendrimers may be defined as synthetic three-dimensional hyper branched, globular macromolecule, which is characterized by its highly branched 3D structure that provides a high degree of surface functionality.
Colloidal particles ranging in size between 10 & 1000 nm are known as nanoparticles.
SLNs are new generation of submicron sized lipid emulsion where the liquid lipid(oil) has been substituted by a solid lipid.
Example: Capture - Dior
Sr no Contents
1 Introduction
2 Advantages and disadvantages
3 Types of nanoparticle
4 Classification of Nanoparticle
5 Polymers used in nanoparticles
6 Method of preparation
7 Evaluation of nanoparticles
8 Application of nanoparticles
9 References
Nanoparticles is derived from the Greek word Nano means extremely small.
Nanoparticles are sub Nano sized colloidal drug delivery systems .
Particle size ranges from 10-1000 nm in diameter .
They are made up of natural, synthetic or semi synthetic polymers carrying drugs or proteinaceous substances, i.e. antigen(s) .
Drugs are entrapped either in the polymer matrix as a particulates or solid solutions or may be bound to particle surface by physical adsorption or by chemical reaction.
Drug can be added during preparation of nanoparticles or to the previously prepared nanoparticles
Nanoparticles can act as controlled release system depending on their polymeric composition.
As a targeted drug carrier nanoparticles reduce drug toxicity
Less amount of dose required.
They enhance aqueous solubility of poorly soluble drug therefore increase its bioavailability, therapeutic efficacy and Reduces side effects.
Nanoparticles can be administer by various routes including oral, nasal, parenteral, intra-ocular etc.
A) AMPHIPHILIC MACROMOLECULE CROSS-LINKING
B) Polymerization method
C)Polymer precipitation method
Heat cross-linking
Chemical cross-linking
Emulsion chemical dehydration
By Crosslinking in W/O Emulsion
PH-induced aggregation
Counter ion induced aggregation
Emulsion polymerization a)Micellar nucleation and polymerization b)Homogenous nucleation and polymerization)
Dispersion polymerization
Interfacial polymerization
Emulsion solvent evaporation method
Double emulsion and evaporation method
Solvent displacement
Salting out
Nanoprecipitation
In this presentation I have mentioned whatever the possible relevant content required for the aptamer based drug delivery.
Citation Is done at the end of slide.
Content is up to date & true to my belief.
Thanks & Best Regards.
Anurag Pandey
B.Pharm (FACULTY OF PHARMACY, INVERTIS UNIVERSITY)
M.Pharm (INSTITUTE OF PHARMACY, NIRMA UNIVERSITY)
Email :- anurag.dmk05@gmail.com
MD. ABU JAR GIFARI
Ph.D. Student
Dept. of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences
Prince of Songkla University
Hat-Yai, Songkhla, Thailand 90110
Phone: +660969247553
Email: agifari50@gmail.com
Dendrimers are nano-sized, radially symmetric molecules with well-defined, homogeneous, and monodisperse structure consisting of tree-like arms or branches.
The second group called synthesized macromolecules ‘arborols’ means, in Latin, ‘trees’. Dendrimers might also be called ‘cascade molecules’
Dendrimers are nearly monodisperse macromolecules that contain symmetric branching units built around a small molecule or a linear polymer core
‘Dendrimer’ is only an architectural motif and not a compound. Dendrimers have gained a broad range of applications in supra molecular chemistry, particularly in host-guest reactions and self-assembly processes.
COMPLETE DESCRIPTION ABOUT DENDRIMERS ALONG THEIR ROLE IN CURRENT MEDICAL SYSTEM,THEIR USEAGE IN CHEMOTHERAPUTIC PURPOSES ETC IS PROVIDED IN THIS PRESENTATION.
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Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
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The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
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2. The term “dendrimer” is derived from the Greek
words “dendron” means tree or branches and
“meros” means part.
It was introduced in 1984 by Donald A. Tomalia.
3. Highly branched
macromolecule
Capable of encapsulating
High loading capacity
Backbone of Carbons or
Nitrogens
Monodisperse and
controllable
Highly stable
Low immunogenicity and
toxicity
4. The structure is highly defined and organized.
Dendrimers posses 3 distinguishing architectural
components:
1) Initiator core.
2) Interior layers.
3) Terminal functionalities.
5. They start from a core molecule with at least 3
chemically reactive arms.
To these arms, branches are attached.
- Repeated many time
6. •Branches extend from core to periphery.
•Large dendrimers adopt a globular shape, in
which all bonds converge to a focal point
•“Star Burst Effect”.
7. Monodispersive.
Exact same molecular weight and structure.
Peculiar behaviour of intrinsic viscosity
8. The terminal groups affect solubility and viscosity
The outer surface area of the molecule increases with the number of
generations
There are void space within the molecule.
These unique geometries give the molecule special properties such as ability to
entrap foreign molecules (drugs).
9. Two common delivery systems
1. Liposome 2. Polymers
Poor stability
Difficulty in targeting
Toxicity
Reduces circulation time
10. ENTANG L EMENTS
Dendrimers Linear Polymers
less entanglements more entanglement
.
11. Architecture
Dendrimers Linear Polymers
Dendritic architecture Linear architecture
has been shown as has not been shown
elegant, uniform, as elegant and can be
spherical and as visualized as
“green peas” “ cooked spaghetti”.
e.g. e.g Polyether linear
Polyether dendrimer. polymer
12. Size / Polydispersity
Dendrimers L inear Polymers
Have certain size, Does not have
monodisperse certain size and are , .
usually poly disperse.
13. Solubility
Dendrimers Linear Polymers
More solubility in Less soluble than
organic solvent in analogous dendrimer
comparison to the in organic solvent
analogous linear e.g. phenylene linear
polymer e.g. analogue.
1, 3, 5 phenylene
based dendrimer.
14. SYMMETRY
Dendrimers Hyper branched Polymers
Monodispersible regular P olydispersible , neither
and highly symmetrical. regular nor symmetrical.
SYNTHESIS
Obtained by careful , Obtained in a single step
stepwise growth of by poly condensation of
successive an A2B monomer.
generations.
15. There are two defined methods of dendrimer
synthesis:
-Divergent
-Convergent growth approach.
In the divergent method the molecule is
assembled from the core to the periphery.
16. In the divergent method, the surface groups
initially are non-reactive or protected species which
are converted to reactive species for the next stage
of the reaction.
In the convergent approach the opposite holds, as
the reactive species must be on the focal point of
dendritic wedge.
17.
18. This type of synthesis involves two steps:
( 1 ) The activation of functional surface groups.
( 2 ) Addition of branching monomer units.
19.
20. ADVANTAGE
The advantage of this method is the ability to modify the
surface of the dendrimer molecule.
21. In successive generation growth, side reactions and
incomplete additions become more apparent.
This is due to steric hindrance.
The overall yield is considerably small
The outer generation has only one kind of functional
group.
22. •The difficulty of many reactions that have to be
performed on one molecule is overcome by
starting the synthesis at the periphery and ending
at the core.
•In this method, growth begins at what will
become the periphery of the final macromolecule
and proceed inward, the final reaction being
attachment to a polyfunctional core.
23. It involves the attachment of the outermost functional group
to an inner generation and the attachment of the inner
generation to the core.
The structural units before the final attachment to the core is
called the wedge.
Usually 3 to 4 wedges attach to the core.
Each wedge can have different functional groups at periphery.
24.
25. Advantage of this method over “divergent growth”
approach :-
control over surface functionality.
Ease for purification.
26. More susceptible to steric inhibition at the focal point
group.
This effectively limits the size of the macromolecules
that may be prepared in conventional fashion.
.
27.
28. Convergent approach affords better control to obtain a better
dendrites architecture than the divergent approach.
Divergent approach is for large scale production.
Both involve stepwise processes that are tedious and time
consuming.
29. The well-defined structure, compact globular shape, size monodispersity
and controllable „surface‟ functionalities of dendrimer makes them excellent
candidates for evaluation as drug carriers.
They can be used as drug delivery agents in 2 ways
(1) Drugs molecules can be physically entrapped inside
the dentritic structure.
(2) Drug molecules can be covalently attached onto
surface or other functionalities to afford dendrimer
drug conjugates.
30. The internal „cavity‟ of the dendritic structure can be
used for the entrapment drugs.
( I ) FIRST STRATEGY: -
First strategy for the encapsulation of the guest
molecules in dendrimers is physical encapsulation.
31. Held by Van der
Waals or dipole
moments
Carrier compounds
do not have to be
solublized
32. 1. Targeted delivery would be difficult to achieve because
drug release occurred by dialysis.
2. Difficult to make universal for all drugs, because
encapsulation by the dendrimer varied significantly
depending on drug and the dendrimer structure.
33. The second strategy for the encapsulation of guest
molecules in dendrimers is based on multiple non-
covalent chemical interactions, such as hydrogen bonding
between guest molecules and dendritic structure.
Sustained release is possible.
34. The third and the most easily implemented startegy
for the encapsulation of drug molecules in
dendrimers is making use of hydrophobic
interactions
Newkome et al. prepared dendritic macromolecules
with a hydrophobic interiors and hydrophilic chain
ends.
These molecules were said to behave as unimolecular
micelles capable of solubilizing various hydrophobic
35. e.g.:- Poly (aryl ether) dendrimers bearing
carboxylic groups as chain ends are able to
enhance the water solubility of the
hydrophobic compound such as pyrene and
anthracene.
36. Higher generation dendrimers
have a greater number of end
groups that can be functionalized
Longer retention time in blood –
PEG
Targeting – ability to attach to
certain tissues or active sites
Imaging – Fluorescence, MRI, or
X-ray
39. Dendrimers as Cancer Therapy
Therapeutic Cancer
agent detector
Reporter Cell death
monitor
Water Nanodevces
molecule
40. A single dendrimer can carry a molecule
that recognizes cancer cells,
A therapeutic agent to kill those cells,
A molecule that recognizes the signals
of cell death