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Study of antimicrobial behavior of socks from bamboo fibers
By  : C. Gomathi

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Methodology & Results


Test 1 - Survivability of Bacteria


To find out how the samples are able to resist the survivability of bacteria, a sample swatch survival test was carried out using two test organisms (Escherichia coli and Staphylococcus aureus). Starting from 24 hours to 120 hours of incubation at 370C, the survival of known test bacterial concentration in all the four samples was assayed over time, every 24 hours. Survival test was also carried out using worn socks. The results of test indicate that the survivability of bacteria on cotton was more lasting compared to rayon and bamboo. The survivability of bacteria on 50/50% Bam/co is similar to bamboo.


The general survivability of the test organism E. coli, was less compared to S. aureus. This analysis indicated that bamboo potentially resists the colonization of both E. coli and S. aureus from the second day of incubation, which is an indication of bamboos antimicrobial resistance characteristic.


Table -1 Survival of bacteria - Escherichia coli (Before wear of socks)


Samples

(Socks)

Initial

0.1 ml inocula

No. of Colonies (103 cfu/ml)

Day - 1

Day 2

Day - 3

Day 4

Day - 5

100% Bamboo

21*

6

-

-

-

-

50/50% Bam/Co

10

-

-

-

-

100% Cotton

57

38

5

-

-

100% Viscose

TNTC

220

103

50

43


* 105 cfu/ml


Table -2 Survival of bacteria - Staphylococcus aureus (Before wear of socks)


Samples

(Socks)

Initial

0.1 ml inocula

No. of Colonies (103 cfu/ml)

Day - 1

Day - 2

Day 3

Day - 4

Day - 5

100% Bamboo

33*

200

16

-

-

-

50/50% Bam/co

250

30

-

-

-

100% Cotton

TNTC

280

20

-

-

100% Viscose

TNTC

TNTC

230

140

28


* 105 cfu/ml


TNTC - Too Numerous To Count


Survival of Bacteria (After Wear of Socks)


Table-3 Survival of bacteria - Escherichia coli (after wear of socks)


Sample (Socks)

Day - 1

Day - 2

Day - 3

Day - 4

Day - 5

100% Bamboo

TNTC

228

146

50

-

50/50% Ba/Co

TNTC

TNTC

160

70

7

100% Cotton

TNTC

TNTC

200

90

25

100% Viscose

TNTC

TNTC

TNTC

TNTC

250


TNTC - Too Numerous To Count


Table-4 Survival of bacteria - Staphylococcus aureus (after wear of socks)


Sample (Socks)

Day - 1

Day - 2

Day - 3

Day - 4

Day - 5

100% Bamboo

TNTC

TNTC

270

-

-

50/50% Ba/Co

TNTC

TNTC

280

150

-

100% Cotton

TNTC

TNTC

TNTC

220

100

100% Viscose

TNTC

TNTC

TNTC

TNTC

TNTC


TNTC - Too Numerous To Count

 

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 Published On :  Wednesday, June 25, 2008

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