107 antimicrobial activity of treated viscose viscose

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10.7 Antimicrobial Activity of Treated Viscose Viscose fabrics untreated and treated with 3-bromopropionic acid, followed by treatment with nanometal oxides (aluminium oxide, zinc oxide, or titanium (IV) oxide), have been intended to destroy one of the most common Gram-negative bacteria ( E. coli ) as well as the famous fungus ( Candida albicans ). Figure 31 a, b reveal the incapability of the 3-bromopropionic acid-treated viscose fabrics to resist the microorganism s growth. On the contrary, a unique ability to stop growth of these microorganisms on the viscose fabric pretreated with 3-bromopropionic acid followed by treatment with nanometal oxides is also observed (El-Sayeed et al. 2015 ). It is also obvious that the ability of nanometal modi fi ed viscose fabrics to reduce the microbial growth is in the following order: zinc oxide > aluminium oxide > titanium (IV) oxide. The ability of nanometal oxide to decrease the number of viable microorganism colonies could be attributed to their environmental stress (reactive oxygen species level) on the bacterial cell wall, which may breakdown the Fig. 30 Effect of concentration of 3-bromopropionic acid and nanometal oxides on antimicrobial activity of the viscose fabric Advances in Nanotextile Finishes An Approach Towards Sustainability 41
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cell wall and the outer membrane. It permits cell contents to leak out and nanometal oxide to enter, leading to cell irregularities and depressions (Okay 2010 ). It is also evident that the antifungal activity of 3-bromopropionic acid is superior compared to its antibacterial activity. 10.8 Durability of Antimicrobial Activity of Treated Viscose Fabric In order to study the resistance to microbial growth, viscose fabrics have been treated with nanometal oxides and also viscose fabrics have been pretreated with 3-bromopropionic acid and/or nanometal oxides which have been exposed to 30 wash cycles. The viscose fabrics treated with 3-bromopropionic acid and after Fig. 31 Effect of 3-bromopropionic acid and nanometal oxides on viscose fabric ( a ) antibacterial activity of viscose fabric ( b ) and antifungal activity of viscose fabric (El-Sayeed et al. 2015 ) 42 N. Gokarneshan et al.
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treated with nanometal oxides exhibit superior reduction in the microorganism s growth, in comparison with those fabrics treated only with nanometal oxides (El-Sayeed et al. 2015 ). This verdict could be attributed to the higher concentration of nanometal oxides on the fabrics treated with 3-bromopropionic acid. The car- boxylic groups added to the fabrics are not only acting as attracting groups for the nanometal oxides, but also fi xing them on the fabric, which could explain the ability of the viscose fabrics, treated with 3-bromopropionic acid and nanometal oxides, to maintain their high antimicrobial activity even after 30 wash cycles.
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  • Fall '19
  • N. Gokarneshan

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