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Silver in Glass vs. Plastic Containers

January 1, 2004  - Non-Toxicity Test

In order to insure not only the best product, but also a safe product, American Biotech Labs hired an independent laboratory to do a toxicology study on the ASAP Solution. The test, called an LD-50 test, was performed in accordance with the guidelines of the Federal Hazardous Substances Act (FHSA) Regulations, 16 CFR 1500.

In the test work, the ASAP Solution was given to a number of both male and female test rats. The amount of ASAP Solution given to the rats was 5g/kg, or the equivalent of a 200 pound man taking 192 teaspoons of about 4 full 8 ounce bottles of the ASAP 10ppm solution at one time (the normal adult dosage is one or two teaspoons/day).

As a result of the test work, the independent laboratory made the following conclusion, "Under the conditions of this study, there was no mortality or significant evidence of toxicity observed in the rats. The test article (ASAP Solution) would not be considered toxic at a dose of 5g/kg by oral route in the rat."

American Biotech Labs Safety Data

American Biotech Labs has had five independent safety and toxicity tests completed on its 10 and 22 PPM silver products. The American Biotech Labs product was tested in animals at as much as 200 times the normal adult dosage, or the equivalent of an adult consuming 32 full ounces of the 10 ppm product at one sitting.  In conclusion to the animal tests, the independent medical testing laboratory stated that the ASAP Solution® was found to be completely non-toxic to the test animals.  The product was also tested for cytotoxicity in both human epithelial cells and also African green monkey or Vero cells, at both the regular 10 ppm level and also at the extra-strength 22 ppm level.  In all four cytotoxicity tests the Amreican Biotech Labs' products were found completely non-toxic to both the human and Vero cells.   

Silver in Glass vs. Plastic Containers

A great deal of controversy has arisen in the market place on the question of whether it is better to store silver solutions in glass versus plastic containers.  There is a misconception that has prevailed in the market place that glass is better.  The idea that glass containers are better for storing products which contain silver has never been proven scientifically.  In fact, it has been reported in other studies that glass may have a detrimental effect on silver products.   

Test Work
I have been conducting biological studies for 3 years, in the laboratory of a major private institution, on the use of silver products to kill and inhibit the growth of bacteria.  I have conducted thousands of tests on numerous strains of pathogenic bacteria. In the testing I have completed, I have used both glass (5 ml glass test tubes) and plastic (Falcon 5 ml polypropylene plastic test tubes). In some of the test work we found that there was a difference in the amount of silver that was needed to kill the bacteria when glass was used versus plastic test tubes.  In order to make sure this was the case, it was decided that the MIC tests (Minimum Inhibitory Concentration) should be replicated by more than one person and a direct comparison was made.  The MIC tests were performed in triplicate in both 5 ml 13X100mm glass test tubes and 5 ml Falcon polypropylene plastic test tubes.  Results of the bacterial (MIC) tests showed that Staphylococcus aureus was inhibited at 2.5 ppm when the MIC test was performed in the plastic test tubes.  S. aureus was inhibited at 5 ppm when the MIC test was performed in glass test tubes.  This suggested that the material with which the test tubes were made, specifically glass or plastic, may have effected the results of the MIC test.  Numerous other tests were also completed using larger concentrations of bacterium and in those tests it was found that there was no significant difference at all between using the glass test tubes versus plastic test tubes.

Other Studies
The studies which I performed are not the only tests showing that glass, in some circumstances, may have a detrimental effect on silver products.  It has been noted in another independent study which has been cited by other researchers that silver can adsorb to glass (Chambers 1960; Thurman 1989). With this in mind, it may have been possible that the silver could have adsorbed to the surface of the glass test tubes reducing the concentration of available silver interacting with the bacteria which resulted in having to use a higher amount of silver to kill the bacteria when the glass test tubes were used.

In the test work I have completed as well as in other available studies, it was found that glass may, in some cases, have a detrimental effect on silver products.  While it can be said that glass did not always show the detrimental effect, it can also be stated that we found no problems at all with using the plastic instead of glass.  Our tests, in conclusion with the other available independent study (1Chambers et al. and 2Thurman et al.), would suggest, by inference, that silver products should not be stored in glass containers which could reduce the available concentration of silver, but rather in a high quality plastic container.


David A. Revelli, MS  


Chambers, C. a. C. P. (1960). The Bacteriological and Chemical Behavior of Silver in Low Concentration. Cincinnati, OH, Division of Water Supply and Pollution Control, U.S. Department of Health, Education, and Welfare.
Thurman, R. a. C. G. (1989). "The Molecular Mechanisms of Copper and Silver Ion Disinfection of Bacteria and Viruses." CRC Critical Reviews in Environmental Control 18(4): 295-314.

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