✍ Scribed by T. C. Kram; J. W. Turczan
No coin nor oath required. For personal study only.
An NMR method for the determination of DMSO in ointments and solutions is presented, using methanol as an internal standard. Samples containing from 20 to 0.05 percent (v/v) DMSO were successfully analyzed with this technique.
IMETHYL SULFOXIDE (DMSO) is readily an-D alyzed by N M R because i t produces a single absorption peak of relatively great intensity and is miscible with a wide variety of solvents. NMR spectroscopy has been used to determine DMSO in a mixture with glycerol and
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A selective reversed-phase HPLC method for the determination of ibuprofen in different ointment bases is described. Following a simple dilution step, the drug was separated from interfering compounds on an octadecylsilica column protected by a precolumn. A mobile phase of aqueous tetrahydrofuran buf
## Abstract Homo‐ and heteronuclear NMR techniques have been used to assign all proton and most of the carbon resonances of phalloidin (1) [cyclic(L‐alanyl‐D‐threonyl‐L‐cysteinyl‐cis‐4‐hydroxy‐L‐prolyl‐L‐alanyl‐L‐mercapto‐L‐tryptophyl‐4,5‐dihydroxy‐L‐leucyl) cyclic (3→6) sulfide], a toxic bicyclic
## Abstract The structure of LH‐RH in DMSO solution was studied using 2D NMR experiments at 600 MHz. The ^13^C NMR spectrum was completely assigned by the combined use of ^1^H‐detected heteronuclear multiple‐quantum coherence and ^1^H‐detected multiple‐bond heteronuclear multiple‐quantum coherence.