New answers tagged biochemistry
1
Whether a mixture of phospholipids/lipids/detergents form micelles or liposome is not dependent on the hydrophobic "payload" but on the nature of the amphiphilic molecules.
Detergents form micelles (and bubbles and antibubbles, when there is air around). The micelles are fairly small (radius similar to the length of the detergent), and they don't ...
2
Suggest: Solubility of either lipids, or (poly)saccharides may be affected by side groups and chains, the length and chemical nature of the later. Instead, see how sub-units are joined together. Typical lipids are esters, e.g. of glycerol:
(credit)
In polysaccarides, sub-units bind together as polyethers like chitin or cellulose:
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1
Sigma states that you can autoclave HEPES solutions:
https://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/Sigma/Product_Information_Sheet/2/h3784pis.pdf
Sigma cites the following reference:
Medzon, E. L. and Gedies, A., Substitution of 4-(2-hydroxyethyl)-1-piperazineethane sulfonic acid (HEPES) for bicarbonate in protein-free animal cell culture ...
0
The comment by Maurice is perfectly good for analytical purposes.
For commercial use, in practical applications, the ash residue is not the only product of combustion that must be completely oxidized. The gaseous products should be $CO_2$, $H_2O$ and $N_2$, maybe a little $SO_2$ - but sometimes organic compounds volatilize before burning and escape. In ...
3
Background
Paraoxon is an irreversible inhibitor. It forms an adduct with the catalytic residue Ser203 of AChE, along with release of p-nitrophenol as leaving group. The resulting covalent phosphoester conjugate is quite stable, but also reversible when using an appropriate oxime before the complex ages. See Franklin et al. 2016 for more details.
To ...
3
You would need very strongly reducing compound to be able to reduce ascorbic acid. Aldehydes are not the case.
Ascorbic acid would not reduce aldehydes like ethanal either, as can be seen by comparison of their respective redox potentials below:
Redox system
$E^{\circ} [\pu{V}]$
Ascorbic/dehydroascorbic acid
+0.35
Ethanal/ethanol
-0.197
Transition d-...
1
It is possible that the ability to release soluble copper ions could be reduced with age.
I am assuming, for example, that a very small amount of the cuprous oxide coating could react with, say, carbonic or hypochlorous acid (from chlorinated water) to create a poorly soluble basic salt.
However, with time, to quote a source, namely Handbook of Industrial ...
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