Not surprising! And it has to be hot to ensure pores are opened.
Surgeons have known empirically for >100 years that scrubbing takes 10
minutes.
Brian
Joe Russeau wrote:
> Well to add some additional information to this subject matter. In
> college I took a majors level microbiology class. This was about the
> time that all of these hand sanitizers were becoming popular. In one
> experiment, our goal was to determine the effectiveness of these
> sanitizers to kill the various microorganisms indigenous to humans.
> Everyone started with a baseline of their uncleaned hands to establish
> each individual's flora. We all have different bugs on our skin, sort
> of like fingerprints if you will.. We used a wide variety of growing
> media from different agar plates to broths to grow all the various
> bugs. Then we washed hands for different times using the various hand
> sanitizers. We re-plated after each cleaning period and each
> sanitizer. Also, this was not done all at once, but over several lab
> periods. Surprisingly, the results showed that a quick wash (less than
> one minute) with these materials was ineffective in reducing the various
> germs. Washing hands longer than five minutes was required to have any
> significant effect.
>
> The sanitizers used today may be somewhat better than nothing, but my
> concern is that the more these are used, the less resistant some of
> these bugs will become. Keep in mind that not all bugs are harmed by
> short exposures to these materials, as they have very good defense
> mechanisms. So if their not killed with short exposures, that helps
> them gain resistance as their DNA evolves very quickly. In addition, as
> humans, we may be doing ourselves a disservice by lowering our own
> natural resistance and defense to these critters. My microbiology
> professor said he believed that the next dominant species on Earth would
> be microorganisms because of our practices with the various sanitary
> cleaners and antibiotic drugs.
>
> Joe Russeau
>
>
>
> ----- Original Message ----- From: "Ken Bloomquist"
> <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, April 27, 2009 11:14 AM
> Subject: Re: [TN] Hand Sanitizer and PCB Assembly
>
>
>> Hi Karen,
>>
>> You wrote: "I've always found hand sanitizer superfluous, just washing
>> ones
>> hands with soap and water kills most germs."
>>
>> I agree that in the work environment you are probably correct but I think
>> that hand sanitizers with at least 60% alcohol are good when you are
>> out in
>> public and can't readily wash your hands. I usually keep a small
>> bottle in
>> my car and an even smaller one in my pocket.
>>
>> KennyB
>> -----Original Message-----
>> From: Karen Tellefsen [mailto:[log in to unmask]]
>> Sent: Monday, April 27, 2009 6:43 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Hand Sanitizer and PCB Assembly
>>
>> Purell:
>>
>> Ingredients:
>> Active Ingredients: Contains: Ethyl Alcohol (62%)
>>
>> Inactive Ingredients: Water, Glycerin, Isopropyl Myristate, Propylene
>> Glycol, Tocopheryl Acetate, Aminomethyl Propanol, Carbomer, Fragrance
>> (parfum)
>>
>>
>> The glycerin and propylene glycol would concern me, they're both
>> hydrophillic. The ethanol in the active ingredient, maybe a mixture of
>> 60% ethanol 35% water 5% isopropanol ( to make it undrinkable, but safe
>> enough for topical use) would be better around circuit boards. It would
>> tend to dry the users' hands, but would not help to contaminate circuit
>> boards.
>>
>> I've always found hand sanitizer superfluous, just washing ones hands
>> with
>> soap and water kills most germs.
>>
>>
>> Karen Tellefsen - Electrical Testing
>> [log in to unmask]
>> 908-791-3069
>>
>>
>>
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