Microbial resistance of cotton and silk finished with plants extracts
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Date
2017
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CCSHAU
Abstract
The study was planned to assess the efficacy of pomegranate and onion peel extracts on cotton and silk
fabrics with respect to microbial resistance. Pomegranate and onion peel extract in two concentrations i.e. 3g/l and
5g/l were prepared. Desized and scoured cotton and degummed silk fabric were finished with these two pure
extracts of pomegranate and onion peels and their three standardized combinations by two methods i.e. exhaust
and pad dry cure method. SEM analysis was also done for visual analysis of extract absorbed by the fabrics. To
study the efficacy of pure pomegranate and onion peel extracts and their combinations, the finished samples were
tested for microbial resistance activity quantitatively by AATCC-100 test method before and after washing.
Physical properties were assessed before and after application of finish. Change in physical properties regarding
fabric weight, thickness, air permeability, moisture regain, bending length, tensile strength, elongation and wicking
property were assessed and effect of washing on all these properties was examined. It was found that percentage
yield of extract was 17.27% for pomegranate peel and 7.46 % for onion peel. Three combinations i.e. 50:50, 25:75
and 75:25 were standardized and selected on the basis of their bacterial reduction from five different combinations
of pomegranate and onion peel extracts i.e. 50:50, 25:75, 75:25, 35:65 and 65:35 for the research work. Bacterial
reduction of cotton and silk finished fabric with pure pomegranate and onion peel extracts and their three
combinations by exhaust method were found to be more effective bacterial reduction as compared to pad dry cure
method. As the concentration of extracts increased, bacterial reduction of all finished samples also increased.
Among all the treatments, cotton and silk fabric finished with combinations of 50:50 was found to be more
effective against bacterial reduction as compared to other combinations i.e. 25:75 and 75:25 and pure pomegranate
and onion peel extracts. It was 98.58% bacterial reduction in cotton fabric with 5g/l concentration of extract and
98.06 % bacterial reduction in silk fabric with 5g/l concentration.
The efficacy of the finish was analyzed and found that cotton and silk fabrics finished with the 50:50
combination of extract of pomegranate and onion peels showed the maximum wash durability up to 5 washing
cycle. Bacterial reduction was found to be more in both finished cotton and silk fabric with 50:50 combination of
extract in 5g/l concentration after one washing cycle as compared to five wash cycles. The percent change in
weight, thickness, bending length and elongation of all finished samples were increased after treatment. The
increase in these physical properties of finished samples was found with increase in concentrations of extracts
while air-permeability, moisture regain and tensile strength decreased. After washing, weight, thickness, bending
length and tensile strength decreased whereas there was increase in air-permeability, moisture regain and
elongation in all finished samples. Thus, 50:50 combinations of pomegranate and onion peel extracts with 5 g/l
concentration applied by exhaust method exhibited excellent bacterial resistance.
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