Detail of "33976-43-1"

Reference

Flow injection determination of penicillins using immobilized penicillinase in a single bead string reactor

Flow injection determination of penicillins using immobilized penicillinase in a single bead string reactor. Gnanasekaran, R.; Mottola, Horacio A. (Dep. Chem., Oklahoma State Univ., Stillwater, OK 74078, USA). Anal. Chem., 57(6), 1005-9 (English) 1985. CODEN: ANCHAM. ISSN: 0003-2700. DOCUMENT TYPE: Journal CA Section: 64 (Pharmaceutical Analysis) Section cross-reference(s): 16 Penicillinase [EC 3.5.2.6] [9001-74-5] immobilized on glass beads was made part of a single bead string reactor used in a flow injection sample processing system for the detn. of penicillins. Immobilization on a glass matrix, after ammonium bifluoride etching, using 95% ethanol, a short, rigid silane such as (p-aminophenyl)trimethoxysilane [33976-43-1], and glutaraldehyde coupling provide prepns. with relatively high activity, retaining 97% of the initial activity after 10 mo of daily usage. The single bead string reactor as part of a flow injection anal. system was used for the detn. of penicillins in pharmaceutical tablets, injectables, and fermn. broths by means of pH monitoring. Penicillin G [61-33-6] and V [87-08-1] can be selectively detd. in the 0.05-0.50 mM range and at a frequency of 150 injections per h.

Covalent molecular assembly of multilayer dendrimer ultrathin films in supercritical medium

All Rights Reserved. Covalent molecular assembly of multilayer dendrimer ultrathin films in supercritical medium. Puniredd, Sreenivasa Reddy; Srinivasan, M. P. (Department of Chemical and Biomolecular Engineering, National University of Singapore 4117576, Singapore). 89-32-7 and 33976-43-1 are cas registry numbers. These chemicals are also mentioned in this article. Journal of Colloid and Interface Science, 306(1), 118-127 (English) 2007 Elsevier. CODEN: JCISA5. ISSN: 0021-9797. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Ultrathin films contg. dendrimers are fabricated on amine- and anhydride-derivatized silicon dioxide surface through alternate layer-by-layer (LbL) assembly of pyromellitic dianhydride (PMDA) and poly(amidoamine) (PAMAM) dendrimer in supercrit. carbon dioxide (SCCO2) with interlayer linkage established by covalent bonds. X-ray photoelectron and UV-visible absorption spectroscopies, at. force microscopy (AFM), and ellipsometry were employed to study the interfacial chem., growth, morphol., and thickness of the assembled film. XPS anal. suggests that the PMDA/PAMAM interlayer covalent bond is established to completion, and functional surfaces for immobilization of the next layer are available after deposition of each layer. UV-visible absorption and ellipsometry revealed layer-by-layer growth of the film. The functional property film as a porous matrix was manifested in the redn. of the refractive index upon introduction of the dendrimer. .