one-pot fabrication of hydroxyapatite/biopolymer composite...
TRANSCRIPT
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Ms. Athittaya Lakhampa
Ms. Nutthaporn Thaweesapand
Dr. Piyachat ChuysinuanDr.-Ing. Patcharakamon Nooeaid
Polymer Materials Technology, Faculty of Agricultural Product Innovation and Technology, Srinakharinwirot UniversityLaboratory of Organic Synthesis, Chulabhorn Research Institute
One-pot Fabrication of Hydroxyapatite/Biopolymer
Composite
Scaffolds for Bone Tissue Engineering
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Bone is… a composite material
Inorganic material Organic material
Hydroxyapatite Protein-based
- Collagen
Bone tissue Osteons and Haversian
canals
Fibrepatterns
Fibres Mineralized collagen
fibrils
Collagen & Hydroxyapatite
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Bone Tissue Engineering >> Composite Scaffolds
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Made of two or more distinctly different materials such as ceramics and polymers
Development of an interconnected CaP-polymer scaffold takes advantages of both
CaP and polymers
Polymer in CaP scaffolds increased toughness and compressive strength
Composite Scaffolds
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Non-toxicity
Porous structure for
supporting cell growth
Osteoconductivity
Biomaterials used
Sufficient mechanical properties
Requirements for Bone Scaffolds
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➢ Powder pressing method
➢ Electrospinning method
➢One-pot process freeze-drying method
Preparation of the Composite Scaffolds
Processability
Low cost
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Sodium Alginate
➢ A is a linear polysaccharide copolymer of (1-4) linked β-D-mannuronic acid (M) and α-L-guluronate (G) monomers
➢ It can be isolated from algae and seaweed
Gelatin
➢ Derived from collagen obtained from various animal body parts
➢ Biocompatible➢ Translucent, colorless, brittle➢ Non-cytotoxic
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To synthesize hydroxyapatite from eggshell waste and simultaneously fabricate HAP/alginate/gelatin composite-based scaffolds by using one-pot process and freeze-drying method
To investigate physical-chemical properties of the fabricated scaffolds
Aims of Work
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CaO powder from eggshell
K2HPO4 3H2O
NH4OH
Precursors for HAP synthesis
Gelatin from porcine skin
Alginate powder
Polymers
Materials
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Experimental
Trials Samples Reaction medium
1 HAP control DI water
2 HAP/Alg Sodium alginate solution
3 HAP/Gel Gelatin solution
4 HAP/Alg/Gel Sodium alginate/gelatin solution
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I. Sentering eggshell powder
CaO
II. Preparation of the HA/Biopolymer composite scaffolds
K2HPO4
CaO/Gelatin/alginatesolution
Control pH
Casting Freezing and freeze-drying
One-pot Fabrication of Hydroxyapatite/Biopolymer Composite Scaffolds
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Results & Discussion
Trial 1 : composite scaffolds received from One-pot method
5 15 25 35 45 55
Inte
nsi
ty (
a.u
.)
2 Theta (Degree)
Alg/Gel/CaO (2-6-1)
Alg/Gel/CaO (2-6-2)
Alg/Gel/HAp (2-6-1)
XRD images of the composites containing 1 and 2% HAP
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Results & Discussion
Trial 2 : composite scaffolds received from One-pot method
FTIR spectra of (a) HA sample synthesized in Alg/Gel/CaO (2-6-1),(b) Alg/Gel/CaO (2-6-2) and (c) Alg/Gel/HA (2-6-1)
5001000150020002500300035004000
%Tr
ansm
itta
nce
Wavenumber (cm-1)
(a) Alg/Gel/CaO (2-6-1)
(b) Alg/Gel/CaO (2-6-2)
(c) Alg/Gel/HAp (2-6-1)
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Results & Discussion
Trial 3 : composite scaffolds received from One-pot method
SEM micrographs of the HA samples synthesized in in (a) Alg/Gel/CaO (2-6-1),(b) Alg/Gel/CaO (2-6-2) and (c) Alg/Gel/HA (2-6-1)
(a) Alg/Gel/CaO (2-6-1) (b) Alg/Gel/CaO (2-6-2) (c) Alg/Gel/HAp (2-6-1)
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Future work
To study the compressionproperties of composite scaffolds
To study biodegradabilityproperties of composite scaffolds
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