Some follow up Chem questions
Posted 13 July 2021 - 08:01 AM
Once the polar/non-polar liquids (whether the polar[aqueous] liquid is acidic or basic) separate, gently mix them up again and let them settle once more. Do it about 3 times, then separate the layers.
The reaction happens when the liquids are mixed together, not at the interface of 2 separated layers.
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Posted 02 August 2021 - 09:27 PM
Posted 08 August 2021 - 04:28 AM
I think your acid choice might matter more than pH value with low pH... The food-grade acids -- citric, acetic, ascorbic, etc are definitely going to play nice with silicone. Hydrochloric and sulfuric might cause problems but I don't think they will; I'd wager a toe (but not a testicle) that you'd be fine using silicone with them. Nitric and nitrous I would definitely test first...
Whatever acid you're planning on using just pour a little bit of the concentrated form into a beaker and stick a cheap spatula into it. Let them sit overnight and check out the silicone in the morning. If there's any discoloration or melting you maybe shouldn't use that utensil.
Keep in mind too that some spatulas have silicone heads and handles made of a different material. If that's what you plan to use, you should definitely test the handle the same way.
*EDIT* Sorry it took me so long to respond. I was indisposed at a delightfully mid-century modern cabin for a much-needed break from the rat-race.
Edited by Phineas_Carmichael, 08 August 2021 - 04:53 AM.
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Posted 25 August 2021 - 01:56 PM
" Published reports demonstrate that a 3:1
blend of ethyl acetate and ethanol is a suitable
replacement for dichloromethane without
compromising chromatographic separation1"
Does this mean EA and ethanol combination may be directly substituted for dichloromethane in extractions?
May ethanol be substituted for methanol?
These are the extractions that I'm reading about:
"Stable-isotope labeling. P. mexicana FSU13617 was grown in 50 mL
liquid MEP medium amended with 1 mM 13C11-L-tryptophan (or 1 mM
unlabeled L-tryptophan for control), for 14 d. The biomass was harvested
by filtration, lyophilized, homogenized and extracted with 20% (v/v) acetic
acid in water. After filtration, the liquid was evaporated under reduced
pressure, and the residue was solved in MeOH, filtered, and used for
Natural product extraction. Initially, mycelia and carpophores were
lyophilized, ground, and extracted with anhydrous MeOH, as described to
extract 1 gently and to minimize its artificial dephosphorylation to 2.
For improved carboline yields, the fungal biomasses (mycelia,
carpophores, or sclerotia) were lyophilized, pulverized, and the powder
solved in 0.1 M HCl and subsequently extracted with methylene chloride
(1:1, v/v). The aqueous phases were collected, the pH value adjusted to
12 using NaOH, which was followed by extractions with methylene
chloride. The organic phases were dried under reduced pressure in a
rotary evaporator. The resulting crude extracts were dissolved in
methanol, centrifuged and filtered, and subsequently used for
chromatographic analysis or purification. To quantify 4 titers in fungal
biomass, the areas under the curve (AUCs) in the extracted ion
chromatograms were determined and referenced to a standard curve
recorded with authentic 4.
I think my final question is:
I have a jar of concentrated mushroom liquor that was extracted using citric acid and water, then concentrated through boiling. The resulting product had an aspic like consistency. I added an equal volume of moonshine to the jar and placed it in the freezer. After reading the above article again, I'm wondering if I should have neutralized or based the extract before adding the ethanol? Could/should I add pickling lime or sodium carbonate to the mix? I'm eventually hoping to filter it and would like to extract all the goodness first.
Here is a link to the complete paper.