The_Bishop
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Does anyone have a source for Peracetic Acid? Looking to change up sanitizers periodically and can't seem to find a source for it on a smaller scale.
I'm wondering what we used at GI. Whatever it was, that peracetic was nasty. A tiny teardrop's worth splashed on my face and I definitely got dinged, the burn lasted several weeks, IIRC.
The commercial PAA is made with much higher concentration acetic acid and peroxide. The peroxide alone is a very dangerous substance at higher concentrations. The simple 3 and 5 percent materials that I mention above, should be less hazardous. But along with less hazard, they are probably not as effective either.
Dang, so that's what happened! I used to buy peracetic acid for my sanitation here in China - it came in two bottles and you were supposed to mix it 50-50 when you diluted it. I think mixing it straight was 15% strength, so I typically mixed about 30-40ml from each bottle with 2 liters of water for a roughly 0.5% solution. Anyway, a couple months ago the bottle that doesn't stink (so probably peroxide) ended up pressurizing and blew out the inner stopper when I opened the cap. I mixed my batch and dumped the rest (dumping the bottles a couple days apart to avoid making a 5% solution in my toilet...) and finally made the plunge on a marked-up bottle of Starsan. Life is too short to have reactive chemicals blowing up in your face.I'm lucky enough to have access to it and if you do get hold of it and decide to use it keep it away from copper! Also if somebody gives you a little bit in a bottle be aware that it degrades over time and that bottle will pressurise, the drums of it we use are fitted with a one way valve so they can vent pressure.
It depends on the level of spoilage. If it visibly clean following a physical clean then your o.k to go with a no rinse. If there is visible organic matter say a biofilm or mould then you are best going a physical clean prior disinfection.
I have been a pharmaceutical microbiologist for 17 years, and this is the approach you would use for cleaning programs in those sectors.
If you are worried about pyrogens then you need to depyeogenate, which can only be done normally by heat treatment.
That is what I am trying to say.Non-rinse and sterilisation don't really go together.
I can explain. Since recently I became a follower of the zero contamination philosophy in home brewing. By that I mean if you take a sample of your beer and seed it on agarized wort, nothing except monoculture of yeast should grow on it. Conventional sanitizers (specifically Star San) do not provide that level of disinfection allowing to achieve that. My recent experience of switching to 3% H2O2 + 0.5% with dish detergent with 60 min exposure and further rinse with boiling water demonstrated significant improvement of beer taste (even without aging). However, I was asking my question because I want to get 6% H2O2 equivalent (since it is not easily available here in Canada) in order to be able to sterilize my Petri dishes and other equipment. With that I want to farm my own yeast from a singular colony.But the real question is why do you need sterilisation?
One of the key things missing in that test to which you linked is the actual populations of organisms introduced into the solutions of disinfectants. That alone makes it impossible to validate the results to a tee. You'd be better off inoculating hard surfaces (PE or stainless steel coupons, as those are relevant materials) and testing a matrix of exposure conditions and exposure times.Thank you guys!
@Queequeg it would be really greate contribution to the community if you could validate the test of Inquisitor Home Brewing discussed in the other thread about StarSan efficiency. My personall perception is that StarSan does not do what it says it does. In addition, their follow up test shows that minimal inhibitory concentration of StarSan is around 6%. Given the number of people using it, I believe you would do a huge favor to everyone.
One of the key things missing in that test to which you linked is the actual populations of organisms introduced into the solutions of disinfectants. That alone makes it impossible to validate the results to a tee. You'd be better off inoculating hard surfaces (PE or stainless steel coupons, as those are relevant materials) and testing a matrix of exposure conditions and exposure times.
If you're interested in the exact tests that Star-San would have had to under go to be labeled as a food-safe sanitizer on hard surfaces, they are listed here: https://www.homebrewtalk.com/forum/threads/sanitizing-products-exist.648816/#post-8277404
But here we are entering into a sort of gray area. Nowhere on it's label it says sanitatizerm thereore legally it might have never been a sanitizer.
https://www.jstrack.org/brewing/msds/starsan.pdf again no single word "sanitizer". It is reffered as sanitizer by the community but may technically not be it....
It seems to me it should not be a big deal for a professional to test wether or not something else is growing from the sample of beer brewed on equipment sanitized with StarSan.
Thank you once again for giving your time and efforts to this discussion. I apologize for being so annoying, but the letter of the label registration states the following "On pre-cleaned food contact surfaces STAR SAN ACID SANITIZER is effective against Escherichia coli (ATCC 43888) and Staphylococcus aureus (ATCC 6538)." Someone, please, correct me if I am wrong, but viability of those two beasts referenced in the label and on the list of tests is incomparable to bacillus subtilits or clostridium botulinum in both vegetative and spore forms. The first one generates higher spirits and the second botulinum toxin. Either can be easily found in the soil and dust, but neither you want in your beer, do you?You are looking at the wrong label. You linked to the safety data sheet (SDS), which only provides information related to safety of the chemicals in the solution. You need to look at the EPA-mandated label that is required for legally-marketed, EPA-registered sanitizers. The label is present on the bottle of Star San, but you can also find it on EPA's website using the registration number: 65001-1 (https://www3.epa.gov/pesticides/chem_search/ppls/065001-00001-20171219.pdf). Note that the federal definition of "label" includes all product information like brochures, websites, and instructions for use.
Again, Star San is registered as a sanitizer with the EPA. To do so, it had to be registered under the federal insecticide, fungicide, rodenticide act (FIFRA). I have been through the FIFRA process on the pharma/med-dev sterilization side of things, and the EPA only accepts hard evidence, not anecdotal. But, that also comes with the understanding that the testing is done under very controlled circumstances that do not represent every real-world situation.
As to how easy it is for professionals to test this; it may actually be quite difficult from a logistics and policy standpoint. Most professional microbiology labs, especially those that are used in regulated industries, don't exactly smile upon unsanctioned testing done after hours.
Not annoying at all, I think it's a good discussion.Thank you once again for giving your time and efforts to this discussion. I apologize for being so annoying, but the letter of the label registration states the following "On pre-cleaned food contact surfaces STAR SAN ACID SANITIZER is effective against Escherichia coli (ATCC 43888) and Staphylococcus aureus (ATCC 6538)." Someone, please, correct me if I am wrong, but viability of those two beasts referenced in the label and on the list of tests is incomparable to bacillus subtilits or clostridium botulinum in both vegetative and spore forms. The first one generates higher spirits and the second botulinum toxin. Either can be easily found in the soil and dust, but neither you want in your beer, do you?
The sanitizer claims are limited to food-borne pathogens. It is a matter of using organisms that are representative of what one would normally encounter in the application. I don't think one often encounters C. botulinum in their brewing (or food preparation) areas when other sanitary (cleaning) practices are regularly applied. The relatively low pH of beer is not favorable for growth of either of those organisms.
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