Dimethylamine buffer

Add to the reaction mixture an equal volume of the reducing agent borane-dimethylamine (BDA) complex, which was previously prepared in the reaction buffer at a concentration of 125 mg/ml. 

Dilute solutions in aqueous buffers exposed to diffused or direct sunlight gave dimethylamine and 5-diazoimidazole-4-carboxamide (215). At pH 1.0 or pH 7.4 and above, this cyclized to 2-azahypoxanthine (216). In the intermediate pH range, a different product was obtained (217) which happens to be the aglycone of the antibiotic bredinin. Compound (217) was not formed by irradiation of (216). It was suggested that the betaine arose from a carbene (218) which had been quenched by water. However, (217) is colourless. Formulated injection solutions which had been found to lose activity contained 10 mg/ml... 

Dicrotophos is hydrolyzed in sodium hydroxide solutions forming dimethylamine. The hydrolysis half-lives at 38 °C and pH values of 1.1 and 9.1 were 100 and 50 d, respectively (Sittig, 1985). Lee et al. (1989a) reported that the hydrolysis half-lives of dicrotophos in pH 5, 7, and 9 buffer solutions at 25 °C were 117, 72, and 28 d, respectively. WA/ Dimethylacetoacetamide and 0-Desmethyldicrotophos were the major products identified. 

Literature proposed CZE methods for phenols and derivatives using test mixtures based on aqueous buffered systems (phosphate-borate and borate " ), volatile electrolytes (ammonium hydrogencarbonate, diethylmalonic acid/dimethylamine in isopropanol and L-cysteic acid, 3-amino-1-propanesulfonic acid, aminomethanesulfonic acid, and diethylmalonic acid ), andnon-aqueous media (ammonium acetate in ACN/acetic acid in MeOH acetate, bromide, chloride, and malonate in ACN and diprotic acids/tetrabutylammonium hydroxide and maleate in MeOH ). 

Rps viridis reaction centers were isolated using the detergent lauryl dimethylamine-N-oxide (LDAO). The LDAO buffer was replaced by 0.3% n-nonyl-)9-D-glucopyranoside (NG), 60% glycerol, 10 mM Tris pH 8 (8,11). The reaction center concentration was adjusted to an absorbance of 1 at 830nm at room temperature. The trapped state was formed by... 

UV-Vis absorbing electrolytes Creatinine, Imidazole, ephedrine, pyridine, copper sulfate, 4-aminopyridine, 4-methylbenzylamine, benzimidazole, p-toluidine, /V,/V -dimethylamine, malachite green, o-aniline, 1-(4-pyridyl)pyridinium All analytes Most universal and can be applied to many non-UV absorbing analytes If a suitable buffer system Is selected... 

Which buffer system will have the greatest buffer capacity at pH 9.0 (i) dimethylamine/dimethylammonium ion, (ii) ammonia/ammonium ion, (iii) hydroxylamine/ hydroxylammonium ion, (iv) 4-nitrophenol/4-nitrophenolate ion ... 

In the presence of humidity, bromoform CHBfs will also attack aluminium. Adding an alkaline buffer (amines such as dimethylamine) to the product may inhibit the attack. Hot bromoform, even anhydrous, will attack aluminium. 

Aluminium resists methyl iodide CH3I at room temperature and in the absence of humidity. In the presence of water, methyl iodide releases hydriodic acid HI, which attacks aluminium. The addition of an alkaline buffer such as dimethylamine or butylamine, which neutralises the released acid, will prevent this attack. 

---