enhancing antibacterial efficacy using protein nanoparticles
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Retrieved from: http://www.eng.uci.edu/files/images/gallery/Protein_Nanoparticle_Structure.jpg. Enhancing Antibacterial Efficacy using Protein Nanoparticles. Leslie Tan Zheng Yu Tan Jing Chong Erik Warnquist Varun Kulkarni. Introduction. - PowerPoint PPT PresentationTRANSCRIPT
Enhancing Antibacterial Efficacy using Protein Nanoparticles
Leslie Tan Zheng Yu Tan Jing Chong Erik WarnquistVarun Kulkarni
Retrieved from: http://www.eng.uci.edu/files/images/gallery/Protein_Nanoparticle_Structure.jpg
Introduction Pesticides are used to eradicate
Agrobacterium tumefaciens High percentage of pesticide does not
reach the target species. Result in water and soil pollution. Threatens biodiversity.
Introduction Usage of nanoparticles as drug carrier
for pesticides Increase in therapeutic efficacy Increasing localisation to diseased sites Decrease in side effect Protein Nanoparticle are biodegradable,
metabolisable and non-antigenic Does not accumulate in tissue
Objective To compare the effectiveness of
antibiotic loaded albumin nanodroplets against antibiotic loaded albumin nanofibre on A. tumefaciens, grown both in vitro and in vivo.
Hypothesis The two delivery techniques will be
comparable, through both qualitative and quantitative means
Variables• Method of drug deliveryIndependen
t
• Efficacy of drug delivery systemDependent
• Type of bacteria (A.tumefaciens)
• Volume and types of antibiotic - tetracycline and ampicillin
• Agrobacterium volume• Sizes of potato strips• Temperature and humidity
Controlled / constant
Equipment Electrospinning apparatus Scanning electron microscope (SEM) Homogenizer Incubator Environmental chamber Spectrophotometer
Materials• Bovine Serum Albumin• Alcohol• A. tumefacians• Potato strips• Diffusion assays• tetracycline and ampicillin
Preparation of albumin nanodropletsEmulsification• Aqueous Bovine Serum Albumin is turned
into an emulsion at room temperature and in oil
• A homogenizer is used to make the emulsion homogeneous. There is a high dispersion of particles
• Emulsion is added to pre-heated oil• Albumin nanoparticles are separated by
desolvating agent eg. Alcohol
Preparation of albumin nanofibers
Electrospinning• Solution inside a syringe exposed to
initial electric field• Electric field increases in charge• Point is reached where attractive forces
of charges exceeds surface tension• The fibers are projected onto a
grounded collector
Antibiotic loading - nanodroplets• Incubating nanoparticles in antibiotic
solution• Antibiotic contained in nanoparticles• Done at protein's isoelectric point
Minimum solubility and maximum absorption BSA: pH of 4.4• Larger amount of antibiotic loaded• Antibiotic entrapment efficacy measured
Antibiotic loading - nanofibresAntibiotics mixed in albumin
solution Homogenous solution Hypothesis that spinning solution will
result in the non polymer antibiotics also being spun
Effectiveness of antibiotic-loaded nanoparticles• Protein nanoparticles digested by
proteases to release antibiotics• Antibiotic-loaded nanoparticles are
subjected to:• A.tumefacians agar plates discs• A.tumefacians-potato strips
Timeline (HCI)Form droplets
w/ specific concentration
and temp.
Load droplets with antibiotics
Test droplets Send for characterization
Examine results and
modify original solution
Timeline (AOS)Form solution with specific
concentration
Spin solution
Test fibersSend for characterization
Examine results and
modify original solution
References Buschle-Diller, G., Cooper, J., Xie, Z., Wu, Y.,
Waldrup, J., & Ren, X. (2007). Release of antibiotics from electrospun bicomponent fibers. Cellulose, 14(6), 553- 562
Collins, A. (2001). Agrobacterium tumefaciens. Department of Plant Pathology, University of North Carolina State. Retrieved September 19, 2010 from: http:/www.cals.ncsu.edu/course/pp728/Agrobacterium/Alyssa_Collins_profile.htm
Frenot, A., & Chronakis, I.S. (2003). Polymer nanofibers assembled by electrospinning. Current Opinion in Colloid and Interface Science, 8(1), 64-75.
Hyuk, Y.S., Taek, G.K., & Park, T.G. (2009). Surface-functionalized electrospun
nanofibers for tissue engineering and drug delivery. Advanced Drug Delivery Reviews, 61(12), 1033-1042.
Jahanshahi, M. & Babaei, Z. (2008). Protein nanoparticle: A unique system as drug delivery vehicles. African Journal of Biotechnology, 7(25), 4926-4934.
Knee, M., & Nameth, S. (2007). Horticulture and Crop Science: Bacteria. The Ohio State University, Horticulture Department. Retrieved September 12, 2010 from : http://www.hcs.ohio-state.edu/hcs300/bact.htm
Kratz, F. (2008). Albumin as a drug carrier: Design of prodrugs, drug conjugates and nanoparticles. Journal of Controlled Release, 132(3), 171-183.
McManus, P. (2007). Antibiotic Use in Plant Disease Control. Fruit Pathology: University of Wisconsin-Madison. Retrieved September 13, 2010 from: http://www.plantpath.wisc.edu/fpath
/antibiotic-use.htm
M.R., Jahanshahi, M., & Najafpour, G.D. (2006). Production of biological nanoparticles from bovine serum albumin for drug delivery. African Journal of Biotechnology, 5(20),
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