Sodium Bisulphite Prep./Synth.

nubee · Master Archiver

just (ctrl+c/ctrl+v)'d this, not confirmed -

Esplosivo · Fri Mar 25, 2005 1:32 pm

Well yes the process can be carried out as described. Instead of sodium carbonate though, sodium hydroxide can be used as follows.

Guest · Sat Mar 26, 2005 1:56 pm

When one has the Sodium Metabisulfite, and IS trying to make a saturated solution,

Is best to add fresh H2O to an over abundant supply of the sulfite,
and pur off the top, after letting it rest 20 mins,

Or yo just keep adding till precipitation occurs?

Just for a test, I use acetone,
with I drip into my saturated solution,
You will see crystals form straight away, an know that it should work for the CHO's as well

syn

IndoleAmine · Dreamreader Deluxe

Make a satd. solution by dissolving NaMeBiSulf in dH2O until solids remain...

Then dilute with a little alcohol, wait until the small amnt. re-precipitated BiSulf has settled, then decant into CLEAN beaker and let sit 30 minutes (this aging is VERY important).

Now just add your carbonyl compound, stir and let sit again (preferably in the cold) to precipitate the bisulfite adduct. Filter off and rinse with dH2O, let dry.

(important: even the smallest concentrations of H+ or OH- will initiate the bisulfite adduct to break down again, so rinsing with distilled H2O is a must here)

To cleave the addition product again, just add dilute aequous acid or lye to the bisulfite adduct crystals, they will dissolve and give off your carbonyl compd. again, which can then be extracted.

(note: sodium/potassium metabisulfite can be interchanged with sodium/potasium bisulfite without any problems, since the metabisulfite generates bisulfite in situ. Only difference is that metabisulfite has approx 2x the molar weight and you only need to use 1/2 as much as with ordinary bisulfite. Both can be found at photography chemical suppliers for very cheap.....)

i_a

java · Consumer

Re: Sodium bisulfite solution

source: http://www.biochemicaldiagnostics.com/reagentprep.html

SATURATED SODIUM BISULFITE SOLUTION
Dissolve 25 grams of Sodium Bisulfite (or Sodium Metabisulfite which converts to Sodium Bisulfite in solution) in 50 mL of Deionized water. Shake well. Dilute 1:1 with Reagent D, **Phosphate Buffer, pH 6.0 for a total volume of 100mL. Shake well. Prepare monthly and store this reagent in a glass bottle with a Teflon or Polypropylene lined screw capped top.

** PHOSPHATE BUFFER, pH 6.0
Prepare 0.25M Potassium Phosphate, Monobasic, (34 gm KH2PO4/liter water). Initial pH is approximately 4.8. Adjust the pH upward to 6.0 with 0.25M Sodium Phosphate, Dibasic , (35.5 gm Na2HPO4/liter of water). (Reagent D)

Note: Posting the source/reference of information is important so as to keep our information authentic .

Guest · Thu Mar 31, 2005 1:00 pm

Yes, this is a really handy way for extracting BzCHO from those little almond essence bottles,
Since they can contain all sorts of exotic compounds, sugars, and the like,

It really makes you think how easy it is to get plentiful supplies of BzCHO from various sources,

You could boil Apricot kernal oil with water, to tranform it into BzCHO, extract with np, then do a bisulfite,
That would be grand,
Or just stick to the Cassia oil, and try it on that,
As we all know, steam distillation, can be a lengthy process,
but a quick extraction, and adduct seperation, should be a breeze

syn

IndoleAmine · Dreamreader Deluxe

Steam distillation of benzaldehyde ís very fast, and you can use a sep.funnel as receiver, to tap off the BzCHO that will separate to the bottom - very easy...

Note: sorry - have no ref for the bisulfite prep., since I wrote it down from my memory. Can be found in "Vogel's", "Organikum" or "Gattermann", or similar books I think. So you will have to trust me on this one - without any given ref... Shocked

(you don't trust me, right Java? Think I would want to fool everyone with this bisulfite preparation, no?) Laughing

i_a

nubee · Master Archiver

Bumblebee · Sat May 07, 2005 10:19 am

i came in contact with the tematic of bisulfite adducts a time ago for, while i tried to extract piperonal from Hydrocinnamic alcohol and posted on the hive for help.
the thread ended with the suggestion to build a bisulfite adduct of the piperonal, and cleave it again to get the aldhyde back.

-could that function? I ask myself if it is possible to seperate the two materials with it... Confused

and do i understand it right:

1.The sodium bisulfite solution is made shortly before extracting something with it. Buffer is not needed then or what??

2.the sodium bisulfite solution forms when i add NaMeBiSulfite to H2O?

Quote from the Hive post:

secret_squirrel · Sun May 08, 2005 9:00 am

Swiss can get almond flavoring in 0.5L containers for dirt cheap. The bottles are mostly propylene glycol with some water and benzaldehyde. Could Swiss drip the almond flavoring into the conc bisulfite solution and collect the benzaldehyde addition product? Or is the propylene glycol and or water in the flavour going to fudge that up?

Thanks

nubee · Master Archiver

just a note that Sodium Meta/Bisulphite has been spotted in pottery and brew stores...