During alkaline hydrolysis, functional groups including amide and carboxylic acid groups were generated on the surface of the PAN nanofibers. Polypyrrole modified solvent resistant nanofiltration membranes. Low-pressure driven electrospun membrane with tuned surface charge for efficient removal of polystyrene nanoplastics from water. O-Linkages, wherein hydroxylysine or hydroxyproline are involved, are stable in alkaline solution. Adsorption of metal and uranyl ions onto amidoximated Pinus densiflora bark. [113] reported that by applying four different alkaline treatments (peroxide alkaline, peroxide alkaline–hydrochloric acid, 5 wt% potassium hydroxide and 18 wt% potassium hydroxide) cellulose fibres with average diameters between 3 nm and 5 nm were obtained. The alkaline hydrolysis of secondary alkyl halides (R2CHX) gives the corresponding alcohol contaminated with some olefin (p. 64). L.K. TATCHELL, in Fundamental Aliphatic Chemistry, 1965. Learn more. Thiolysis of oxazines 135 with a solution of H2S in methanol–triethylamine (1:1) provided thioamides 136 in moderate to good yields (Equation 12). In the case of GalNAc-Ser/Thr linkages, it stabilizes the reducing end of the released oligosaccharides via conversion of GalNAc into GalNAc-ol.195,196 Hereby, the initially formed 2-aminoacrylic acid in the case of Ser and 2-aminocrotonic acid in the case of Thr are transformed into DL-Ala and DL-2-aminobutyric acid. In one approach, the glycoprotein is attached to a solid support using hydrophobic interaction with alkali-resistant reversed-phase beads, and a flow of alkali was used to release the O-glycans; only a limited amount of peeling was observed.202 In another approach, aqueous ammonium hydroxide (for β-elimination)-ammonium carbonate (for converting released oligosaccharides into glycosylamines) was used to release O-glycans as stable glycosylamines; conversion into oligosaccharides was realized through the addition of boric acid. The absence of significant peeling was suggested.203,204 It should be noted that N-glycans may also be liberated from N-glycoproteins by alkaline borohydride treatment. Therefore, if the mixture produced at the end of the reaction is hydrolyzed by mild acid, carboxylic acid is found in the mixed solution. SMITH, A.R. Structure and electrochemical properties of highly conductive and porous carbon nanofiber derived from inclusion complex of cyclodextrin-phenylsilane. Use the link below to share a full-text version of this article with your friends and colleagues. Although being a successful methodology, over the years side reactions have been reported, especially those occurring at the reducing end (e.g., modification or absence of the proximal GlcNAc residue).184–188 Hydrazinolysis under oxygen-free argon seems to reduce this side-product formation.189 The presence of mucin-type O-glycans in the glycoprotein sample may cause problems, since part of the O-linked chains is released and partly degraded by the hydrazinolysis conditions as used for the release of N-glycans.190. The racemate 135, an isomer of 127 (n = 1), has also been resolved into 136 and a ring-opened product 137 by a lactamase present in the whole cells of Rhodococcus globerulus at pH 7 for 24 h. These β-amino acids have been used in the syntheses of potential medicinal chemicals <2003C248, 2004T717>.
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