COST FP1205 March 7-9 2017, Stockholm Glycidyl methacrylate modified nanocellulose from cotton waste and bacterial nanocellulose Bongio C., Bernardi A., Zarattini M., Cosentino C., Vismara E.
OUTLINE COST FP1205 March 7-9 2017, Stockholm Scientific background Preparation of nanocelluloses COST FP1205 March 7-9 2017, Stockholm Functionalization of nanocelluloses Potential applications Conclusions and further perspectives
SCIENTIFIC BACKGROUND From CELLULOSIC TEXTILES to NANOCELLULOSE
SCIENTIFIC BACKGROUND From cellulosic textiles Engineered glycidyl methacrylate (GMA) cotton fibers as adsorbents for the removal of aromatic pollutants from wastewaters GMA C-GMA Glycidyl form COST FP1205 March 7-9 2017, Stockholm Epoxide hydrolysis Different affinities, in agreement with the polarity of cellulosic branches and tested aromatics C-GMAOH Glycerol form Vismara, E. Journal of Hazardous Materials, 170, 798-808, 2009.
SCIENTIFIC BACKGROUND From cellulosic textiles Engineered glycidyl methacrylate (GMA) cotton fibers as drug delivery systems. COST FP1205 March 7-9 2017, Stockholm C-GMA promotes reversible adsorption of antibacterial drugs (AMX and VC). The adsorption capability is enhanced by the chemical trasformation into C-GMAOH Graziani, G.; Montanelli, A.; Melone,L.; Vismara, E.; Torri, G. EP 2182931 B1 (2015)
SCIENTIFIC BACKGROUND From cellulosic textiles Engineered glycidyl methacrylate (GMA) cotton for developing drug delivery systems. Microbiological inhibition tests on S. Aureus by 1) cellulose, 2) C-GMA and 3) C-GMAOH impregnated with VC (Kirby Bauer method) Graziani, G.; Montanelli, A.; Melone, L.; Vismara, E.; Torri, G. EP 2182931 B1 (2015)
SCIENTIFIC BACKGROUND From cellulosic textiles Engineered glycidyl methacrylate (GMA) cotton for developing drug delivery systems. The adsorption can be correlated to: favorable polar interaction molar substitution ratio (MS) of cellulosic materials molecular structure of tested antibiotics Effect of the MS on the adsorption of VC and AM onto C-GMAOH Graziani, G.; Montanelli, A.; Melone, L.; Vismara, E.; Torri, G. EP 2182931 B1 (2015)
SCIENTIFIC BACKGROUND to nanocelluloses WHY NANOCELLULOSE? Modification or improvement of some properties preserving the overall nature of the original cellulose Very large surface-to-volume ratio Mechanical properties Chemical and morphological controllability Biocompatibility Biodegradability Toxicity ENVIRONMENTAL APPLICATIONS BIOMEDICAL APPLICATIONS Lin, N. European Polymer Journal, 59, 302 325, 2014 Jin, S.F. Advanced Materials Research, 662, 198-201, 2013
PREPARATION OF NANOCELLULOSES WHICH TYPE OF NANOCELLULOSES? DIFFERENT TYPES OF NANOCELLULOSE IN VIEW OF THEIR APPLICATION Hydrolyzed nanocellulose (HNC) From cotton waste Oxidized nanocellulose (ONC) Bacterial nanocellulose (BNC) From glucose units
PREPARATION OF NANOCELLULOSES HNC & ONC STARTING MATERIAL: industrial cotton waste from an Italian company (CFT) Cellulose CFT SEM images of CFT 13 C CP-MAS solid state NMR spectra
PREPARATION OF NANOCELLULOSES Hydrolyzed nanocellulose (HNC) Cr.I % CFT = 59% CFT H2SO4 64% 45 C, 6h HNC Integration gives the crystallinity index: Cr.I (%)= 68% SEM images of HNC 13 C CP-MAS solid state NMR of HNC FT-IR of HNC Siqueira, G.; Bras, J.; Dufresne, A. Biomacromolecules 10, 425-432, 2009. TEM images of HNC
PREPARATION OF NANOCELLULOSES Oxydized nanocellulose (ONC) CFT TEMPO, NaBr NaClO 10%, ph=10, T amb ONC CO signal SEM images of ONC CO signal 13 C CP-MAS FT-IR solid state of ONC NMR of ONC Okita, Y. Biomacromolecules 11, 1696-1700, 2010 TEM image of ONC
PREPARATION OF NANOCELLULOSES Bacterial nanocellulose (BNC) Gluconacetobacter Xylinus BNC TEM image of BNC FT-IR of BNC 13 C CP-MAS solid state NMR of BNC El-Saied, H. Bioresources, 3, 1196-1217, 2008
FUNCTIONALIZATION OF NANOCELLULOSES GMA GRAFTING HNC ONC BNC HNC-GMA ONC-GMA BNC-GMA 1. NANOCELLULOSE ACTIVATION: Fenton-type reaction (H 2 O 2 /Fe 2+ ) Very stable C-C bond 2. GMA GRAFTING Very stable glycidyl ester Epoxide group useful for further modifications 3. WASHING (removal of not-grafted GMA homopolymer)
FUNCTIONALIZATION OF NANOCELLULOSES CHARACTERIZATION OF GMA-CELLULOSES 13 C CP-MAS solid state NMR New detectable signals: methyl group, epoxide ring carbonyl ( 178 ppm). No presence of signals related to olefinic carbons (120 160ppm) Cellulose C-GMA absence of unreacted GMA.
FUNCTIONALIZATION OF NANOCELLULOSES CHARACTERIZATION OF GMA-CELLULOSES FT-IR analysis Cellulose C-GMA MS = molar substitution degree average number of GMA residue for glucose unit
FUNCTIONALIZATION OF NANOCELLULOSES HNC-GMA 13 C CP-MAS NMR of HNC-GMA SEM image of HNC-GMA MS = 1,9 VERY HIGH FT-IR of HNC-GMA
FUNCTIONALIZATION OF NANOCELLULOSES ONC-GMA 13 C CP-MAS NMR of ONC-GMA MS = 2,4 VERY HIGH FT-IR of ONC-GMA
FUNCTIONALIZATION OF NANOCELLULOSES BNC-GMA MS = 0,12 MS = 0,7 13 C CP-MAS NMR of BNC-GMA SEM image of BNC-GMA MS = 0,24
POTENTIAL APPLICATIONS Removal of aromatic pollutants Hydrolyzed nanocelluloses (HNCs) 400 300 MS = 1,9 2-Naphtol (2N) Q (mg/g) 200 100 HNC HNC-GMA 0 0 10 20 30 40 50 time (h) Plot of Q vs. time for the adsorption of 2N on HNC and HNC-GMA Good capacity to adsorb 2N Q = milligrams of adsorbed molecules on grams of nanocellulose The presence of GMA strongly enhances this property
POTENTIAL APPLICATIONS Removal of aromatic pollutants Oxydized nanocelluloses (ONCs) 2-Naphtol (2N) Q (mg/g) 0,2 0,15 0,1 0,05 0 ONC ONC-GMA MS = 2,4 0 20 40 60 80 100 time (h) Plot of Q vs. time for the adsorption of 2N on ONC and ONC-GMA Both ONCs show an insignificant capacity to absorb 2N, although the presence of GMA slightly increase the adsorbed amount.
POTENTIAL APPLICATIONS Removal of aromatic pollutants BNCs were not testes for this purpose because considered sophisticated 2-Naphtol (2N) materials more suitable for biomedical applications (properties and costs)
POTENTIAL APPLICATIONS Drug delivery 600 Both 400ONCs show an extremely significant Q (mg/g) 200 HNCs time (h) MS = 1,9 HCN HCN GMA capacity to absorb AMX, with no differences onto the process kinetics. Amoxicillin (AMX) 0 0 0 15 30 45 60 75 90 105 120 135 0 15 30 45 60 75 90 Q (mg/g) 600 400 200 MS = 2,4 time (h) ONCs Blank HNC shows moderate properties of AMX adsorbtion. GMA-functionalization ONC ONC-GMA quadruplicate this tendency. roughly Plot of Qt vs. time for the adsorption of AMX on HNC and HNC-GMA Plot of Qt vs. time for the adsorption of AMX on ONC and ONC-GMA
POTENTIAL APPLICATIONS Drug delivery BNCs Amoxicillin (AMX) Q (mg/g) 90 60 30 0 BNC BNC-GMA 0.7 < MS <1 0 10 20 30 40 50 60 time (h) Blank BNC do not adsorb AMX in effective way. GMA functionalization induces a significant effect on AMX adsorption capacity Plot of Qt vs. time for the adsorption of AMX on BNC and BNC-GMA
POTENTIAL APPLICATIONS Drug delivery Q(mg/g) 180 150 120 90 60 30 0.7 < MS <1 BNCs BNC BNC-GMA Vancomycin (V) 0 0 25 50 75 100 125 time (h) Plot of Qt vs. time for the adsorption of V on BNC and BNC-GMA Both BNCs show a significant capacity to adsorb Vancomycin GMA functionalization induces a slight increment in adsorption of the antibiotic
CONCLUSIONS GMA was grafted successfully to all the nanocellulosic materials GMA functionalization promotes an effective decrease of the amount of active molecules (pollutants and antibiotics) in solution, in comparison with the native materials
FURTHER PERSPECTIVES Evaluate the parameters (polarity, MS ) that are responsible for different adsorption profiles Open the epoxide ring of GMA-nanocelluloses (the reaction has already be performed) and investigate the adsorption capacities of the new obtained materials Modulate the GMA grafting (decrease of MS)
ACKNOWLEDGMENTS THANKS TO: My supervisor, Prof. Elena Vismara My colleagues Non Profit Foundation Istituto G. Ronzoni staff (Milano, Italy) CFT Pietro Masserini Spa (Bergamo, Italy) ALL OF YOU FOR YOUR KIND ATTENTION AND OPPORTUNITY!