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M. Sc. Dissertations

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Author: Jamal, Zeba × End date: 2016 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Effect of extract of guava leaves on cotton for microbial resistance
    (CCSHAU, 2016) Jamal, Zeba; Vivek Singh
    Consumers have become more aware of hygiene and potentially harmful effects of microbes, which in turn have increased the demand of antimicrobial textiles. Considering the significance of antimicrobial textiles, the Guava leaves extract treatment was prepared and applied on cotton fabric. To find out the efficiency of Guava leaves extract treatment the parameters like antibacterial activity, wash durability and physical properties of controlled, treated and washed samples were compared. Extraction of Guava leaves was conducted by cold aqueous maceration for two different time periods. 24 hours showed yield percentage of 15 % which was greater than yield percentage obtained by 12 hours i.e. 6%. The concentrations 1mg/ml, 3mg/ml and 5mg/ml were tried for antibacterial activity against Bacillus spp. The 5mg/ml concentration exhibited strong zone of inhibition of 19 mm. The Guava leaves extract was applied on cotton woven fabric by exhaust method in 5g/l concentration. The antibacterial treatment with 5g/l concentration of Guava leaves extract with dilution factor (107 and 108) was cent percent effective after 24 hours of inoculation of Bacillus spp. After 24 hours percent bacterial reduction gradually decreased and on 28th day it reduced to 67%. The Guava leaves extract treated samples exhibited cent percent wash durability after 24 hours of inoculation in washed samples (one wash). After 24 hours it gradually decreased and on 28th day it reduced to 64%. Thus, there was continuous decrease in the antibacterial activity with an increase in incubation period after washing but even then the antibacterial treatment was actively retained in washed samples even on 28th day. After desizing and scouring fabric weight, thickness, bulk and fabric count both in warp and weft direction of fabric increased significantly while tensile strength in both warp and weft directions and air permeability decreased significantly. The percent changes in bending length in both warp and weft directions, flexural rigidity and moisture regain were found to be non-significant. After Guava leaves extract treatment fabric weight and bulk of fabric increased significantly while tensile strength in warp and weft directions, flexural rigidity and air permeability decreased significantly. The changes in thickness, bending length, fabric count in both warp and weft direction and moisture regain were found to be non- significant. After washing weight, bulk, flexural rigidity and tensile strength in warp and weft directions of Guava leaves extract treated samples decreased significantly while air permeability increased significantly. The changes in thickness, bending length, fabric count in both warp and weft direction and moisture regain were found to be non-significant. Conclusively, the Guava leaves extract treated fabrics exhibited excellent efficacy against antibacterial activity and washing. However, it is needed to be renewed after every wash for good resistivity to washing.