Degradation of Bio polymer
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Transcript of Degradation of Bio polymer
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DegradationOf Bio
Polymers• Presented By- Rahul Dev
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What is Biopolymers? IntroductionBiopolymers are polymers prod
uced by living organisms.They are
polymeric biomolecules.
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DEGRADATION• Degradation is a process by which
the polymer is fragmented by means of small molecules.
• In this the large polymer divided into smaller molecules.When degradation starts there is shown a change in colour.
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Cont…
• Generally polymer degrades by following process
• Thermal Degradation• Photo Degradation• Mechanical Degradation• Chemical Degradation• Oxidative Degradation
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Bio Degradation• Bio Degradation is a natural process
by which organic chemicals in the enviornment are converted into simpler componds.
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Cont...• All Bio Polymers are not bio
Degradable• Due to the presence of Hydroxil
group most of the bio polymer are hydrophilic in nature after absorbing water they degrade easily.
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Mechanism Of Bio Dergadation
• The most important organism to biodegradation are fungi,bacteria and algae.
• Natural polymers are degraded in biological systems by the oxidation and hydrolysis.
• Temp. is one of the most important factors affecting micro-organism growth.
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Mechanism Of Bio Dergadation
Fungi active in biogeradation process.E.g. sporotricum Talaromyces ganodermeEtc.
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Types of Bio Degradation• Aerobic Biodegradation• Polymers+O2CO2+H2O+biomass+residu
cess
• If oxygen is present aerobic biodegration occurred and carbon dioxide is produced.
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Types of Bio Degradation• Anaerobic Biodegradation• PolymerCO2+CH4+H2O+biomass+r
esiducess• If there is no oxygen an anaerobic
degradation occurs and methane is produced with CO2
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Degradation Mechanism Via Hydolysis
• Polyesters, polyanhydrides, polycarbonates and polyamides are mainly degraded by hydrolysis into low-molecular-weight oligomers.
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Examples• Degradation Of Starch-• Starch is a polymer which occurs widely in plants. The
principal crops used for its production include potatoes, corn and rice.
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Enzymatic hydrolysis of Starch
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Examples
• Degradation Of Cellulose• Most of the cellulolytic
microorganisms belong to eubacteria and fungi, even though some anaerobic protozoa and slime molds able to degrade cellulose have also been described. Cellulolytic microorganisms can establish synergistic relationships with non-cellulolytic species in cellulosic wastes.
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Enzymatic hydrolysis of Cellulose
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Poly (caprolactone)• Degradation mechanism is started by the
hydrolysis of the polymer chain 6-hydroxyhexanoic acid an intermediate of w-oxidation than β-oxidation to acetyl-CoA (Acetyl coenzyme A), which can then undergo further degradation in TCA ( tricarboxylic acid) cycle as illustrated.
• The molecular weight readily decreases during bio degradation, and is accompanied by a broadening of the molecular weight distribution.
• The cystallinity of PCL increases with the degradation, indicating preferential degradation in amorphus regions.
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PCL Degradation Mechanism
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Poly (lactic acid)
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• Non-enzymatic Hydrolysis• Readily degraded in compost.• Several enzymes can degrade the
polymer which include proteinase K, pronase and bromelain.
• Actinomycete, a PLA degrading strain, reduced 100 mg of PLA film by 60% in the first 14 days in liquid culture at 303 K.
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Degradation Of Biopolyesters• Component monomers are bonded via
ester linkages.• Many kinds of esters occur in nature and
the esterase enzyme.• Ester linkages are generally easy to
hydrolyze.• Ester on hydrolysis gives acid and alcohol.• Biopolyester upon hydrolysis divided into
small fragments.Hence a number of synthetic polyesters are biodegradable
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Advantages Of Biopolymer
• 1-Takes less time to break down .• 2-Renewable .• 3-Good for enviromental.• 4- Easior to recycle .• 5-Less energy to produce.
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References• Biodegradable polymers for industrial
application By Ray Smith.• Biodegradation of polymers By Premraj
and Mukesh Doble
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•Thank You