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Author Topic: CHITOSAN  (Read 2975 times)

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gumusonur

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CHITOSAN
« on: August 02, 2018, 10:26:06 PM »


hi,

How can i solve ''Chitosan''?
anybody know?

thanks
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P

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Re: CHITOSAN
« Reply #1 on: August 02, 2018, 10:35:52 PM »

Do you mean 'dissolve'? Or is there a problem to 'solve' with your batch of it.

I had to look up what it was   -  a sugary powder obtained from shrimp and crab shells? Wiki suggests they dissolve it with alkaline solutions. I have never done it. Sounds like sodium hydroxide will do it from the wiki page about it.
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gumusonur

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Re: CHITOSAN
« Reply #2 on: August 02, 2018, 10:54:17 PM »


i read that we can solve chitosan in acetic acid but Sodium hydroxide is solution alkaline. despite the fact that i will try this method.
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wildfyr

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Re: CHITOSAN
« Reply #3 on: August 03, 2018, 03:28:36 AM »

P I don't know where you got that info but, you use acidic solution. It protonates the amine to help solubility. Chitosan is made from Chitin by boiling it in caustic to deactylate the amine
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gumusonur

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Re: CHITOSAN
« Reply #4 on: August 03, 2018, 03:49:36 AM »


wildfyr, which one should I use? asidic or basic solution?
i have very little chitosan. I have to use it carefully. :)
P and Wildfyr, also, i wanna many thanks to you for your interest..
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wildfyr

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Re: CHITOSAN
« Reply #5 on: August 03, 2018, 05:22:23 AM »

Acid. I am absolutely sure. It is soluble below pH 4 I believe.
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Re: CHITOSAN
« Reply #6 on: August 05, 2018, 10:42:37 PM »

P I don't know where you got that info but, you use acidic solution.

I'll bow to your better knowledge of it - As O said, I had to look it up because I didn't know what it was. The wiki page said sodium hydroxide - maybe that's the pre treatment to help solubility:

"Chitosan /ˈkaɪtəsæn/ is a linear polysaccharide composed of randomly distributed β-(1→4)-linked D-glucosamine (deacetylated unit) and N-acetyl-D-glucosamine (acetylated unit). It is made by treating the chitin shells of shrimp and other crustaceans with an alkaline substance, like sodium hydroxide." - https://en.wikipedia.org/wiki/Chitosan
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wildfyr

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Re: CHITOSAN
« Reply #7 on: August 06, 2018, 02:25:11 PM »

Yep, you do a heterogenous reaction of chitin with caustic, then filter and rinse with water. As I said before, this deactylates the amide. The resulting amine cns be protonated to give a water soluble polymer with a lot of nifty properties.
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gumusonur

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Re: CHITOSAN
« Reply #8 on: August 07, 2018, 03:02:47 AM »

hey, 1.5% Chitosan dissolved in 1% acetic acid and %1 lactic acid solution. thanks everything.
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