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KVE (gemiddel d van triplikate) Voor filtrasie (A) Filtrasie met PVA Filtrasie met PVA+AgNO 3 (B) % Afname in KVE R%=[(A-B)/A] x100 LitNet Akademies Jaargang 9(2), Augustus 2012 3,6 x 104 5,9 x 105 4,7 x 105 9,2 x 106 1,0 x 107 1,2 x 107 3,0 x 103 1,0 x 104 2,0 x 103 91,67 % 98,39% 99,57% Tabel 2. Opsomming van die antimikrobiese aktiwiteit van PAN-nanovesels met 5% (wt/v) AgNO3 IVIS-beelde van organisme in kontak met gewone PAN-vesels (A) en PAN-vesels met 5% (wt/v) AgNO3 (B). P.aeruginosa (Xen 5) A B E.coli (Xen 14) A B K.pneumonia (Xen 39) A % Afname in fotone Standaardfout van die gemiddelde (n=3) R%=[(A-B)/A] x100 98,49% ± 1.3 99,96% ± 0.03 99,99% ± 0.01 Voor filtrasie 3,0 x 102 (A) KVE Filtrasie met (gemiddel 2,0 x 104 PAN d van triplikate) Filtrasie met PAN+AgNO 6,4 x 105 1,4 x 107 1,1 x 106 4,2 x 107 3 (B) 0 0 0 % Afname in KVE R%=[(A-B)/A] x100 100 % 100% 100% Om op te som: PVA- en PAN-nanovesels wat silwer-nanopartikels bevat, is suksesvol gesintetiseer met behulp van die borrelbemiddelde elektrospintegniek. Dit is bevestig deur EDX/SEM-analise. SEM-visualisering het soortgelyke morfologiese voorkoms getoon vir PVA- en PAN-nanovesels wat silwer-nanopartikels bevat. Terugkaatsende elektronbeelde het gewys dat silwer-nanopartikels in PVA-vesels meer eweredig versprei is as in PANnanovesels, maar dat PAN-nanovesels ’n hoër silwerinhoud as PVA-nanovesels het. Dit is bevestig deur EDXanalise. Beide PVA- en PAN-nanovesels het uitstekende antimikrobiese B 38
LitNet Akademies Jaargang 9(2), Augustus 2012 aktiwiteit, met PVA-nanovesels wat silwer-nanopartikels bevat wat tussen 91% en 99% van bakterieë in ’n besmette waterbron ontsmet het. PAN-nanovesels met silwer-nanopartikels het ’n hoër antimikrobiese aktiwiteit gehad, met 100%-ontsmetting van drie patogene. As daar in ag geneem word dat PVA-nanovesels met silwer-nanopartikels van ’n wateroplosbare, nietoksiese en bioafbreekbare polimeer vervaardig word, en dat dit uitstekende antimikrobiese aktiwiteit het, is dit hoogs toepasbaar in watersanitasie, veral in ’n omgewingsbewuste millieu. Aan die ander kant leen die sinteseproses van PAN-nanovesels dit beter tot die vorming van silwer-nanopartikels, en lewer dit dus nanovesels met ’n hoër silwer-nanopartikelinhoud wat patogenies gekontamineerde water volledig kan steriliseer. PAN-nanovesels het ’n beter langlewendheid en sterkte in water, wat dit ideaal maak vir waterfiltrasie en -sanitasie in hoër-deurvloei-sisteme. Die metodes wat in hierdie studie gebruik is om die antimikrobiese aktiwiteit van hierdie vesels te bepaal, was akkuraat, maklik en vinnig uitvoerbaar. Erkenning Ons bedank graag vir Eskom vir befondsing en Eugene Smit by die Departement van Polimeerwetenskap, Universiteit Stellenbosch vir sy tegniese bystand met die borrelbemiddelde elektrospintegniek. Bibliografie Balazs, D.J., K. Triandafillu, P. Wood, Y. Chevolot, C. van Delden, H. Harms, C. Hollenstein, H.J. Mathieu. 2004. Inhibition of bacterial adhesion on PVC endotracheal tubes by RF-oxygen glow discharge, sodium hydroxide and silver nitrate treatments. Biomaterials 25:2139-151. Berger, T., J. Spadaro, R. Bierman, S.E. Chapin, R.O. Becker. 1976. Antifungal Properties of Electrically Generated Metallic Ions. Antimicrob. Agents Chemother. 10:856-60. Botes, M. en T. Eugene Cloete. 2010. The potential of nanofibres and nanobiocides in water purification. Crit. Rev. Microbiol. 36:68-81. Bottero, J.; Rose, J.; Wiesner, M.R.2006. Nanotechnologies: Tools for sustainability in a new wave of water treatment processes. Integrated Environmental Assessment and Management. 2:391-395. Cho, K.; Park, J.; Osaka, T.; Park, S. 2005. The study of antimicrobial activity and preservative effects of nanosilver ingredient. Electrochim. Acta. 51:956-960. Choi, O.; Deng, K.; Kim, N.; Ross, L.; Surampalli, R.; Hu, Z. 2008. The inhibitory effects of silver nanoparticles, silver ions, and silver colloids on microbial growth. Water Research. 42:3066-3074. 39
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