will a 1W 445 steralize ?

[Mohrenberg]

I curious if a 1W 445 can be effectively used to sterilize items or liquids. I do not have a microscope or the equipment to test it though.

has anyone tried this?

 

[Toke]

I doubt it will be particularly effective.

The heat at the focus point would of course work, but no better than a blowtorch.
What you might be thinking off is UV light and it's effect on cells.

I don't see coherent light would be any better than regular light, so if you want to use light you should get some UV leds.

 

[iFoSh]

I'm in pharmacy school so this is just my schooling talking (haven't tried it). The temperature that a focused 1W 445nm puts out up close would be enough to sterilize that exact spot…but it would be like trying to wipe a counter with an ethanol cloth the size of the head of a needle haha. It would kill the bacteria or virus’ in that tiny spot alone.

 

[00Giorge]

I'm in pharmacy school so this is just my schooling talking (haven't tried it). The temperature that a focused 1W 445nm puts out up close would be enough to sterilize that exact spot…but it would be like trying to wipe a counter with an ethanol cloth the size of the head of a needle haha. It would kill the bacteria or virus’ in that tiny spot alone.

The laser won't sterilize it but some of that good ole Arkansas moonshine will!:beer:

 

[Bionic-Badger]

You might be able to burn it off, but you'll want UVC (from germicidal lamps that produce 254nm) to do any serious sterilization. Even UVA or UVB probably won't be sufficient for sterilization--maybe skin cancer--but not sterilization.

 

[millirad]

^ Yeah short wavelengths like you mention will do the job. You might also consider even shorter wavelengths. Don't forget your lead lab coat and lead shorts...............

Some foods potentially harbouring e-coli and other pathogens are irradiated.......

 

[oic0]

I wonder about a line generator like that 1000w yag cleaning laser.

 

[Toke]

The freshwater system on some merchant ships use a fluorescent tube to sterilise the water.
It is an uncoated tube giving off UV light, mounted in a plastic tube in the water line with some O-rings for insulation.
The alternative is silver electrodes adding ions to the water.

 

[AJ_Dual]

I wonder about a line generator like that 1000w yag cleaning laser.

LOL... I'm pretty sure that would do the trick.

 

[Serac]

I have worked in some sterile labs and agree with

I'm in pharmacy school so this is just my schooling talking (haven't tried it). The temperature that a focused 1W 445nm puts out up close would be enough to sterilize that exact spot…but it would be like trying to wipe a counter with an ethanol cloth the size of the head of a needle haha. It would kill the bacteria or virus’ in that tiny spot alone.

this

SteriPEN Adventurer Opti Water Purifier with Solar Charging Case

is a pretty sweet UV sterilizing system I have one for travel and climbing. Before you sterilize you have to have a clean surface or filtered water to begin with

 

[oic0]

LOL... I'm pretty sure that would do the trick.

I meant a 445 with a line generator Could spread out the deadly area while still having it focused.

 

[Mohrenberg]

I'm talking about the light itself, not the heat. If a 445nm can kill bacteria the same way a uv bulb will do it. or is it too high on the spectrum?

 

[iFoSh]

It is too high. The 254nm and 185nm is what they use to sterilize (more 254nm). The lower wavelengths are better absorbed by DNA which in turn causes it to inhibit the bacteria's replication. It doesn't kill the bacteria...it just makes it harmless.

 

[Benm]

Its way to high in wavelength to sterilize things like germicidal lamps do. 445 nm is wavelength present in sun- and daylight virtually all bacteria evolved under, and will not be effective at all (aside from thermal effects).

As for 254 nm or ionizing radiation: at low levels neither will kill bacteria as a guarantee, but that doesnt matter much. As long as bacteria are rendered impossible to divide, you stick with the orginal amount present, which virtually stalls spoilage of foodstuffs etc. Ionizing radiation is preferred though, since that will penetrate the entire lot, whereas uv irradiation is limited to the surface unless the product is transperant (like bottled water).

 

[Cyparagon]

It is too high. The 254nm and 185nm is what they use to sterilize (more 254nm). The lower wavelengths are better absorbed by DNA which in turn causes it to inhibit the bacteria's replication. It doesn't kill the bacteria...it just makes it harmless.

Nonsense. "This short-wave ultraviolet light disrupts DNA base pairing causing thymine-thymine dimers leading to death of bacteria"

Think about it: homicide - suicide - genocide - germicide.

 

[Arayan]

A germicidal lamp must have a wide field of illumination. A laser of the same wavelength would be useless because it illuminates only a small spot. BTW I tried it with a laser at 405 nm of 100 mW, and it's not able to sterilize anything