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Silver Dressing Studies

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Advanced Silver Antimicrobial Burn,
Surgical and Wound Care Products
 

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Listed below are 3 categories of Studies for Silverlon® Products. Please click on the category of interest to view the study in which you are interested in. If you would like to view or print the entire study page in a separate Browser Window, please click here

 

Antimicrobial Human
Ion Release

 

Silverlon® Antimicrobial Studies

 

1. USP Antimicrobial Preservative Effectiveness

     

The USP Antimicrobial Preservative Effectiveness Test determines protection that Silverlon® fabric provides to microbial contamination.  Study was performed by North American Science Association Inc.

 

Method

            Duplicate 20 g portions of the test article in 200 ml of saline (SC) were separately inoculated with the appropriate amount of suspension to achieve an approximate population of 105 -106  cells per g of test article.  Inoculated sample aliquots were held 20-25oC throughout the course of the study.  Using various dilution blanks and Tryptic Soy Agar (TSA) and Sabourauds Dextrose Agar (SDA) for plating, total plate counts were performed on each sample at 0,7,14,21 and 28 days after inoculation.  The SDA plates were incubated at 20-25oC for 5 days.  The TSA plates were incubated at 30-35oC for 3 days.

 

Results

 

 

S aureus ATCC9027

P. aeruginosa ATCC8739

E. coli

ATCC6538

C. albicans

ATCC10231

A. niger ATCC16404

Organisms per Gram of Silverlon

1.5 x 105

1.9 x 105

2.6 x 105

4.8x 105

1.2 x 105

After 7 Days

<10

3.5 x 101

<10

<10

4.0 x 101

After 14 Days

0

0

0

0

0

After 21 Days

0

0

0

0

0

After 28 Days

0

0

0

0

0

 

Interpretation

Under the conditions of this study, Silverlon® was effective in the product examined up to 28 days.

 

2. Antimicrobial Activity-Dynamic Test of Surfaces ASTM E 2149

 

            The Antimicrobial Activity-Dynamic Test of Surfaces ASTM E 2149 determines the effectiveness of Silverlon® as a bactericidal antimicrobial.  Study was performed by North American Science Association Inc.

 

Method

 

The antimicrobial activity of the Silverlon® Wound Contact Dressing 4x4 was evaluated by the Antimicrobial Activity Dynamic Test of Surfaces ASTM E2149 for 106 CFU/ml of Pseudomonas aeuroginosa ATCC 9027 and Staphylococcus aureus (MRSA). Plate counts are performed at zero time of inoculation and after 1/2 hours, 1 hour, 2 hour and 4 hours of incubation at 370C. 

Test Article:     

Silverlon®

Test Organism:

Staphyloccous aureus (MRSA)  ATCC 33591

 

Pseudomonas aeruginosa    ATCC 9027

Sample Size:    

2.00 +/- 0.01 g

Pre-Wet Medium:        

Sterile Deionized Water

Neutralizer:      

Letheen Broth

Target Inoculum Level: 

(1-2) x 105  CFU/0.1 ml

Inoculum Concentration:          

S. aureus  =  3 x 106  CFU/ml

 

P. aeruginosa  =  3 x 106 CFU/ml

Test Date: 

2/21/02

 

 

Bacterial Species

Time

0 Hour

0.5 Hour

1 Hour

1.5 Hour

2 Hour

4.0 Hour

Staphylococcus aureus MRSA ATCC 33591

1,500,000

CFU/ml

210,000

CFU/ml

3,400

CFU/ml

2,500

CFU/ml

120

CFU/ml

0 CFU/ml

Pseudomonas aeruginosa ATCC 9027

2,400,000

CFU/ml

0 CFU/ml

0 CFU/ml

0 CFU/ml

0 CFU/ml

0 CFU/ml

 

 

 

3. Assessment of Antibacterial Finishes on Textile Materials AATCC Test Method 100 (24 hours)

 

The Assessment of Antibacterial Finishes on Textile Materials Method 100 determines whether the antimicrobial agent applied to a medical device or textile is effective toward inhibiting bacterial growth. Study was performed by North American Science Association Inc. 

 

Method

A 4.8 cm disc of Silverlon® is inoculated with 1.2 x 105 CFU of S. aureus and P. aeruginosa.  Plate counts are performed at zero time of inoculation and after 24 hours of incubation at 370C. 

 

Test Article:                                          Silverlon®

Test Organism  :                                   Staphylococcus aureus         ATCC 6538

                                                            Pseudomonas aeruginosa    ATCC 9027

Sample Size:                                         48 mm diameter disk

Pre-Wet Medium:                                 Sterile Deionized Water

Neutralizer:                                           Letheen Broth

Target Inoculum Level:              (1-2) x 105  CFU/0.1 ml

Inoculum Concentration:                        S. aureus  =  1.3 x 105  CFU/0.1 ml

                                                             P. aeruginosa  =  3.2 x 105 CFU/0.1 ml

Test Date:                                             5/26/98

 

Results

 

Results (CFU/ml)

Sample I.D.

Zero Contact Time

24-hour Contact Time

Percent Reduction

1

S. aureus

P.aeruginosa

S. aureus

P.aeruginosa

S. aureus

P. aeruginosa

2

1.4 x 105

2.7 x 105

<1.0 x 102

<1.0 x 102

99.93

99.97

 

Interpretation

The antimicrobial agent, silver, applied to the textile surface was shown to be effective in inhibiting  S. aureus and P. aeruginosa  99.93 and 99.97 respectively.

 

 

3. Assessment of Antibacterial Finishes on Textile Materials AATCC Test Method 100 (4 hours)

 

The Assessment of Antibacterial Finishes on Textile Materials Method 100 determines whether the antimicrobial agent applied to a medical device or textile is effective toward inhibiting bacterial growth. Study was performed by North American Science Association Inc. 

 

Method

A 4.8 cm disc of Silverlon® is inoculated with 1.2 x 106 CFU of Staphylococcus areus  ATCC 6538, Pseudomonas aeruginosa  ATCC 9027, Enterococcus faecalis (VRE) ATCC 51575 and Staphyloccous aureus  ATCC 33591.  Plate counts are performed at zero time of inoculation and at 30 minutes, 2 hours and 4 hours after incubation at 370C. 


Test Article:                                           Silverlon®

Test Organism:                                       Staphylococcus areus  ATCC 6538

 Pseudomonas aeruginosa  ATCC 9027

 Enterococcus faecalis (VRE) ATCC 51575

                                                             Staphyloccous aureus (MRSA)  ATCC 33591                     

Sample Size                                           48 mm diameter disk

Pre-Wet Medium:                                  Sterile Deionized Water

Neutralizer:                                             Letheen Broth

Target Inoculum Level:                            (1-2) x 106  CFU/ ml

Inoculum Concentration:                          (1-2) x 106 CFU/ml

Date:                                                       2/21/02


 

 

Test Organism

Results in CFU/ ml

Time Interval

Zero

30 Minutes

2 Hours

4 Hours

Staphylococcus areus

ATCC 6538

1,700,000

5,400

4,000

3,000

Pseudomonas aeruginosa  ATCC 9027

2,000,000

3,700

4,500

< 10

Enterococcus faecalis (VRE) ATCC 51575

1,900,000

150,000

5,400

14,000

Staphyloccous aureus

 ATCC 33591

1,700,000

14,000

14,000

5,000

 

 

Assessment of Antimicrobial Effectiveness Silverlon

AATCC Test method 100

Reduction in CFU/ml versus Time

Interpretation

Interpreting this data in terms of long reduction, the difference between the initial bacterial concentration and the bacterial concentration in CFU/ml at ˝ hour, 2 hours and 4 hours is calculated an summarized in the following table.

 

Assessment of Antimicrobial Effectiveness Silverlon

AATCC Test method 100

Percent Reduction in CFU/ml versus Time

 

 

Test Organism

Results Percent Reduction

Time Interval

30 Minutes

2 Hours

4 Hours

Staphylococcus areus

ATCC 6538

99.99 %

99.77 %

99.83 %

Pseudomonas aeruginosa  ATCC 9027

99.82 %

99.78 %

99.99 %

Enterococcus faecalis (VRE) ATCC 51575

92.31 %

99.72 %

99.28 %

Staphyloccous aureus

 ATCC 33591

99.18 %

99.18 %

99.71 %

           

4. Dow Corning Corporate Test Method 0923

 

The Dow Corning Corporate Test Method determines whether the antimicrobial agent applied to a medical device or textile is effective toward inhibiting bacterial growth. Study was performed by North American Science Association Inc.

 

Method

Antimicrobial activity of Silverlon® was evaluated by shaking a sample in 1.0 – 2.0 c 104 CFU/ml of Staphylococcus aureus, ATCC 6538 and Pseudomonas aeruginosa, ATCC 9027 suspensions for one hour contact time.  The suspension was diluted before and after contact to determine bacterial counts. Study was preformed by North American Science Association Inc.

Test Article:                                          Silverlon® 

Sample Size:                                         0.75 +  0.01 g

Target Inoculum Level:              (1-2) x 104  CFU/ml

Test Date:                                             5/26/98

 

Results

Organism Count (CFU/ml)

Test Organism

Zero Time

One Hour

Percent Reduction

Staphylococcus aureus  ATCC 6538

9,300

<10

99.89

Pseudomonas aeruginosa   ATCC 9027

27,000

<10

99.96

 

 

Organism Count (CFU/ml)

Test Organism

Zero Time

One Hour

Percent Reduction

Staphylococcus aureus  ATCC 6538

10,000

<10

99.90