Did the experiment test for the presence of BPA? Olushola
On Sun, Jun 15, 2014 at 9:08 AM, Cyndi <cyndi...@gmail.com> wrote: > > > On 6/13/2014 2:37 PM, Alan Faulkner wrote: > >> Dollar stores ebay >> http://www.ebay.com/sch/i.html?_odkw=dropper+bottles&_ >> osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR4.TRC2. >> A0.H0.Xglass+dropper+bottles&_nkw=glass+dropper+bottles&_sacat=0 >> >> Search dropper bottles small spray bottles etc on ebay. >> >> I would tend to avoid plastic just on principle although I do use some. >> I make my own so I just use old water bottles. >> >> Al >> > > I can't imagine taking just drops of cs and of course the dropper makes > the bottle more expensive. I did just research using glass vs plastic and > found this study that showed glass was less effective than plastic, just > the opposite of what I would have thought. I read other webpages that said > as long as you use BPA free plastic you are fine. I'm thinking that for > shipping plastic would be better because of breakage. The USPS is rough on > mail, even when clearly labeled fragile. > > Cyndi > > > I found this for the glass vs plastic debate: > > Silver in Glass vs. Plastic Containers > by David A. Revelli, MS > > Introduction > > 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. > > Conclusion > > 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. > > Respectively, > David A. Revelli, MS > > References > > 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. > > http://www.lifesilver.com/faq.htm > > > > -- > The Silver List is a moderated forum for discussing Colloidal Silver. > Rules and Instructions: http://www.silverlist.org > > Unsubscribe: > <mailto:silver-list-requ...@eskimo.com?subject=unsubscribe> > Archives: http://www.mail-archive.com/silver-list@eskimo.com/ > maillist.html > > Off-Topic discussions: <mailto:silver-off-topic-l...@eskimo.com> > List Owner: Mike Devour <mailto:mdev...@eskimo.com> > > >
